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TRANSMISSION & DRIVELINE

                                                                                                                                                                   A




                                                             TRANSAXLE & TRANSMISSION
                                                                                                SECTION                     TM                                     B



                                                                                                                                                                   C


                                                                                                                                                                   TM


                                                                                                                                                                   E
                                                                CONTENTS
BASIC INSPECTION ................................... 6
                                                .                                 DTC Confirmation Procedure .................................40.                  F
                                                                                  Diagnosis Procedure ..............................................40
                                                                                                                                                .
DIAGNOSIS AND REPAIR WORKFLOW ......... 6
                                  .
 Work Flow ................................................................ 6
                                                                     .          DTC P0615 START SIGNAL CIRCUIT ............. 41
                                                                                                                                                                   G
 Diagnostic Work Sheet ............................................. 7
                                                                     .            Description ..............................................................41
                                                                                                                                                          .
                                                                                  CONSULT-III Reference Value in Data Monitor
FUNCTION DIAGNOSIS .............................. 9
                                             .                                    Mode .......................................................................41
                                                                                                                                                          .
                                                                                  On Board Diagnosis Logic ......................................41       .        H
A/T CONTROL SYSTEM .................................... 9
                                                  .                               Possible Cause .......................................................41.
 Cross-Sectional View (2WD models) ....................... 9          .           DTC Confirmation Procedure .................................41          .
 Cross-Sectional View (4WD models) ..................... 10           .           Diagnosis Procedure ..............................................41    .         I
 Shift Mechanism ..................................................... 10
                                                                      .
 TCM Function ......................................................... 22
                                                                      .         DTC P0700 TCM ............................................... 44
 CAN Communication .............................................. 23  .           Description ..............................................................44
                                                                                                                                                        .
 Input/Output Signal of TCM .................................... 24   .           On Board Diagnosis Logic ......................................44     .          J
 Line Pressure Control ............................................ 24.           Possible Cause .......................................................44
                                                                                                                                                        .
 Shift Control ........................................................... 26
                                                                      .           DTC Confirmation Procedure .................................44        .
 Lock-up Control ...................................................... 27
                                                                      .           Diagnosis Procedure ..............................................44  .          K
 Engine Brake Control ............................................. 28.
 Control Valve .......................................................... 28
                                                                      .         DTC P0705 PARK/NEUTRAL POSITION
 Component Parts Location ..................................... 30    .         SWITCH ............................................................. 45            L
                                                                                  Description ..............................................................45
                                                                                                                                                          .
A/T SHIFT LOCK SYSTEM ...............................31
                                                 .                                CONSULT-III Reference Value in Data Monitor
 System Description ................................................ 31
                                                                .                 Mode .......................................................................45
                                                                                                                                                          .
 Component Parts Location ..................................... 31
                                                                .                 On Board Diagnosis Logic ......................................45       .        M
                                                                                  Possible Cause .......................................................45.
ON BOARD DIAGNOSTIC (OBD) SYSTEM .....32
                                  .                                               DTC Confirmation Procedure .................................45          .
 Introduction ............................................................ 32
                                                                      .           Diagnosis Procedure ..............................................45    .        N
 OBD-II Function for A/T System ............................. 32      .
 One or Two Trip Detection Logic of OBD-II ........... 32             .         DTC P0717 TURBINE REVOLUTION SEN-
 OBD-II Diagnostic Trouble Code (DTC) ................. 32            .         SOR ................................................................... 48
 Malfunction Indicator Lamp (MIL) ........................... 33      .                                                                                            O
                                                                                  Description ..............................................................48
                                                                                                                                                          .
                                                                                  CONSULT-III Reference Value in Data Monitor
DIAGNOSIS SYSTEM (TCM) ............................34
                                               .                                  Mode .......................................................................48
                                                                                                                                                          .
 CONSULT-III Function (TRANSMISSION) ............ 34
                                             .                                                                                                                     P
                                                                                  On Board Diagnosis Logic ......................................48       .
COMPONENT DIAGNOSIS ........................ 40
                                         .                                        Possible Cause .......................................................48.
                                                                                  DTC Confirmation Procedure .................................48          .
DTC U1000 CAN COMMUNICATION LINE ......40
                                   .                                              Diagnosis Procedure ..............................................48    .
 Description ............................................................. 40
                                                                      .
 On Board Diagnosis Logic ..................................... 40    .
                                                                                DTC P0720 VEHICLE SPEED SENSOR A/T
 Possible Cause ...................................................... 40
                                                                      .         (REVOLUTION SENSOR) ................................. 50


Revision: April 2007                                                      TM-1                                                                   2008 Titan
  Description ............................................................. 50
                                                                          .          Diagnosis Procedure .............................................. 65
                                                                                                                                                    .
  CONSULT-III Reference Value in Data Monitor
  Mode ...................................................................... 50
                                                                          .        DTC P0744 A/T TCC S/V FUNCTION (LOCK-
  On Board Diagnosis Logic ..................................... 50       .        UP) .................................................................... 67
                                                                                                                                                        .
  Possible Cause ...................................................... 50.          Description ............................................................. 67
                                                                                                                                                             .
  DTC Confirmation Procedure ................................ 50          .          CONSULT-III Reference Value in Data Monitor
  Diagnosis Procedure ............................................. 51    .          Mode ...................................................................... 67
                                                                                                                                                             .
                                                                                     On Board Diagnosis Logic ..................................... 67       .
DTC P0725 ENGINE SPEED SIGNAL ............. 53
                                        .                                            Possible Cause ...................................................... 67.
  Description ............................................................. 53
                                                                          .          DTC Confirmation Procedure ................................. 67         .
  CONSULT-III Reference Value in Data Monitor                                        Diagnosis Procedure .............................................. 68   .
  Mode ...................................................................... 53
                                                                          .
  On Board Diagnosis Logic ..................................... 53       .        DTC P0745 LINE PRESSURE SOLENOID
  Possible Cause ...................................................... 53.        VALVE .............................................................. 69
                                                                                                                                                    .
  DTC Confirmation Procedure ................................ 53          .          Description ............................................................. 69
                                                                                                                                                             .
  Diagnosis Procedure ............................................. 53    .          CONSULT-III Reference Value in Data Monitor
                                                                                     Mode ...................................................................... 69
                                                                                                                                                             .
DTC P0731 A/T 1ST GEAR FUNCTION .......... 55
                                       .                                             On Board Diagnosis Logic ..................................... 69       .
  Description ............................................................. 55
                                                                        .            Possible Cause ...................................................... 69.
  On Board Diagnosis Logic ..................................... 55     .            DTC Confirmation Procedure ................................. 69         .
  Possible Cause ...................................................... 55
                                                                        .            Diagnosis Procedure .............................................. 69   .
  DTC Confirmation Procedure ................................ 55        .
  Diagnosis Procedure ............................................. 56  .          DTC P1705 THROTTLE POSITION SENSOR... 71
                                                                                     Description ............................................................. 71
                                                                                                                                                             .
DTC P0732 A/T 2ND GEAR FUNCTION .......... 57
                                       .                                             CONSULT-III Reference Value in Data Monitor
  Description ............................................................. 57
                                                                        .            Mode ...................................................................... 71
                                                                                                                                                             .
  On Board Diagnosis Logic ..................................... 57     .            On Board Diagnosis Logic ..................................... 71       .
  Possible Cause ...................................................... 57
                                                                        .            Possible Cause ...................................................... 71.
  DTC Confirmation Procedure ................................ 57        .            DTC Confirmation Procedure ................................. 71         .
  Diagnosis Procedure ............................................. 58  .            Diagnosis Procedure .............................................. 71   .
DTC P0733 A/T 3RD GEAR FUNCTION .......... 59
                                       .                                           DTC P1710 A/T FLUID TEMPERATURE SEN-
  Description ............................................................. 59
                                                                        .          SOR CIRCUIT ................................................... 73
                                                                                                                                               .
  On Board Diagnosis Logic ..................................... 59     .            Description ............................................................. 73
                                                                                                                                                             .
  Possible Cause ...................................................... 59
                                                                        .            CONSULT-III Reference Value in Data Monitor
  DTC Confirmation Procedure ................................ 59        .            Mode ...................................................................... 73
                                                                                                                                                             .
  Diagnosis Procedure ............................................. 60  .            On Board Diagnosis Logic ..................................... 73       .
                                                                                     Possible Cause ...................................................... 73.
DTC P0734 A/T 4TH GEAR FUNCTION .......... 61
                                       .
                                                                                     DTC Confirmation Procedure ................................. 73         .
  Description ............................................................. 61
                                                                        .
                                                                                     Diagnosis Procedure .............................................. 73   .
  On Board Diagnosis Logic ..................................... 61     .
                                                                                     Component Inspection ........................................... 75     .
  Possible Cause ...................................................... 61
                                                                        .
  DTC Confirmation Procedure ................................ 61        .          DTC P1721 VEHICLE SPEED SENSOR MTR... 77
  Diagnosis Procedure ............................................. 62  .            Description ............................................................. 77
                                                                                                                                                             .
                                                                                     CONSULT-III Reference Value in Data Monitor
DTC P0735 A/T 5TH GEAR FUNCTION .......... 63
                                       .
                                                                                     Mode ...................................................................... 77
                                                                                                                                                             .
  Description ............................................................. 63
                                                                        .
                                                                                     On Board Diagnosis Logic ..................................... 77       .
  On Board Diagnosis Logic ..................................... 63     .
                                                                                     Possible Cause ...................................................... 77.
  Possible Cause ...................................................... 63
                                                                        .
                                                                                     DTC Confirmation Procedure ................................. 77         .
  DTC Confirmation Procedure ................................ 63        .
                                                                                     Diagnosis Procedure .............................................. 77   .
  Diagnosis Procedure ............................................. 64  .
                                                                                   DTC P1730 A/T INTERLOCK ........................... 79
                                                                                                                                   .
DTC P0740 TORQUE CONVERTER CLUTCH
                                                                                     Description ............................................................. 79
                                                                                                                                                           .
SOLENOID VALVE ........................................... 65
                                                       .                             On Board Diagnosis Logic ..................................... 79     .
  Description ............................................................. 65
                                                                          .
                                                                                     Possible Cause ...................................................... 79
                                                                                                                                                           .
  CONSULT-III Reference Value in Data Monitor
                                                                                     DTC Confirmation Procedure ................................. 79       .
  Mode ...................................................................... 65
                                                                          .
                                                                                     Judgement of A/T Interlock .................................... 79    .
  On Board Diagnosis Logic ..................................... 65       .
                                                                                     Diagnosis Procedure .............................................. 79 .
  Possible Cause ...................................................... 65.
  DTC Confirmation Procedure ................................ 65          .        DTC P1731 A/T 1ST ENGINE BRAKING ........ 81
                                                                                                                         .

Revision: April 2007                                                          TM-2                                                                   2008 Titan
  Description ............................................................. 81
                                                                         .           Description ..............................................................93
                                                                                                                                                             .
  CONSULT-III Reference Value in Data Monitor                                        CONSULT-III Reference Value in Data Monitor                                        A
  Mode ...................................................................... 81
                                                                         .           Mode .......................................................................93
                                                                                                                                                             .
  On Board Diagnosis Logic ..................................... 81      .           On Board Diagnosis Logic ......................................93       .
  Possible Cause ...................................................... 81
                                                                         .           Possible Cause .......................................................93.          B
  DTC Confirmation Procedure ................................. 81        .           DTC Confirmation Procedure .................................93          .
  Diagnosis Procedure .............................................. 81  .           Diagnosis Procedure ..............................................94    .

DTC P1752 INPUT CLUTCH SOLENOID                                                    DTC P1815 MANUAL MODE SWITCH ............ 95                                         C
VALVE ...............................................................83
                                                                 .                   Description ..............................................................95
                                                                                                                                                             .
  Description ............................................................. 83
                                                                         .           CONSULT-III Reference Value in Data Monitor
  CONSULT-III Reference Value in Data Monitor                                        Mode .......................................................................95
                                                                                                                                                             .          TM
  Mode ...................................................................... 83
                                                                         .           On Board Diagnosis Logic ......................................95       .
  On Board Diagnosis Logic ..................................... 83      .           Possible Cause .......................................................95.
  Possible Cause ...................................................... 83
                                                                         .           DTC Confirmation Procedure .................................95          .
                                                                                                                                                                        E
  DTC Confirmation Procedure ................................. 83        .           Diagnosis Procedure ..............................................95    .
  Diagnosis Procedure .............................................. 83  .           Component Inspection ............................................96     .
                                                                                     Position Indicator Lamp ..........................................96    .
DTC P1757 FRONT BRAKE SOLENOID                                                                                                                                          F
VALVE ...............................................................85
                                                                 .                 MAIN POWER SUPPLY AND GROUND CIR-
  Description ............................................................. 85
                                                                         .         CUIT .................................................................. 98
  CONSULT-III Reference Value in Data Monitor                                        Diagnosis Procedure ..............................................98
                                                                                                                                                   .                    G
  Mode ...................................................................... 85
                                                                         .
  On Board Diagnosis Logic ..................................... 85      .         CLOSED THROTTLE POSITION AND WIDE
  Possible Cause ...................................................... 85
                                                                         .         OPEN THROTTLE POSITION CIRCUIT ......... 100
                                                                                     CONSULT-III Reference Value in Data Monitor                                        H
  DTC Confirmation Procedure ................................. 85        .
  Diagnosis Procedure .............................................. 85  .           Mode ..................................................................... 100
                                                                                                                                                             .
                                                                                     Diagnosis Procedure ............................................ 100    .
DTC P1762 DIRECT CLUTCH SOLENOID                                                                                                                                         I
VALVE ...............................................................87
                                                                 .                 BRAKE SIGNAL CIRCUIT .............................. 101
  Description ............................................................. 87
                                                                         .           CONSULT-III Reference Value in Data Monitor
  CONSULT-III Reference Value in Data Monitor                                        Mode ..................................................................... 101
                                                                                                                                                             .
                                                                                     Diagnosis Procedure ............................................ 101    .          J
  Mode ...................................................................... 87
                                                                         .
  On Board Diagnosis Logic ..................................... 87      .         TOW MODE SWITCH ..................................... 102
  Possible Cause ...................................................... 87
                                                                         .
                                                                                     Description ............................................................ 102
                                                                                                                                                           .            K
  DTC Confirmation Procedure ................................. 87        .
                                                                                     Diagnosis Procedure ............................................ 102  .
  Diagnosis Procedure .............................................. 87  .
                                                                                   A/T SHIFT LOCK SYSTEM ............................. 103
DTC P1767 HIGH AND LOW REVERSE                                                       Wiring Diagram - A/T Shift Lock System - Floor                                     L
CLUTCH SOLENOID VALVE ...........................89
                                             .                                       Shift ...................................................................... 103
                                                                                                                                                               .
  Description ............................................................. 89
                                                                         .           Wiring Diagram - A/T Shift Lock System - Column
  CONSULT-III Reference Value in Data Monitor                                        Shift ...................................................................... 107
                                                                                                                                                               .        M
  Mode ...................................................................... 89
                                                                         .           Terminals And Reference Values ......................... 110              .
  On Board Diagnosis Logic ..................................... 89      .           Component Inspection .......................................... 110       .
  Possible Cause ...................................................... 89
                                                                         .
  DTC Confirmation Procedure ................................. 89        .         ECU DIAGNOSIS ...................................... 113
                                                                                                                                      .                                 N
  Diagnosis Procedure .............................................. 89  .
                                                                                   TCM ................................................................. 113
DTC P1772 LOW COAST BRAKE SOLENOID                                                   Reference Value ................................................... 113.           O
VALVE ...............................................................91
                                                                 .                   Wiring Diagram -- A/T CONTROL SYSTEM -- ... 115                        .
  Description ............................................................. 91
                                                                         .           Fail-Safe ............................................................... 125
                                                                                                                                                            .
  CONSULT-III Reference Value in Data Monitor                                        DTC Inspection Priority Chart ............................... 127      .
                                                                                                                                                                        P
  Mode ...................................................................... 91
                                                                         .           DTC No. Index ...................................................... 127
                                                                                                                                                            .
  On Board Diagnosis Logic ..................................... 91      .           DTC Alphabetical Index ........................................ 128    .
  Possible Cause ...................................................... 91
                                                                         .
  DTC Confirmation Procedure ................................. 91        .         SYMPTOM DIAGNOSIS ........................... 130
                                                                                                                               .
  Diagnosis Procedure .............................................. 91  .
                                                                                   SYSTEM SYMPTOM ....................................... 130
DTC P1774 LOW COAST BRAKE SOLENOID                                                   A/T Check Indicator Lamp Does Not Come On .... 130
                                                                                                                                     .
VALVE FUNCTION ...........................................93
                                                      .                              Engine Cannot Be Started in "P" or "N" Position .. 130

Revision: April 2007                                                         TM-3                                                                     2008 Titan
  In "P" Position, Vehicle Moves When Pushed ......131                   .         Inspection ............................................................. 203
                                                                                                                                                          .
  In "N" Position, Vehicle Moves .............................131        .
  Large Shock("N" to "D" Position) ..........................133         .       STALL TEST ................................................... 204
                                                                                                                                             .
  Vehicle Does Not Creep Backward in "R" Position..135                             Inspection and Judgment ..................................... 204
                                                                                                                                               .
  Vehicle Does Not Creep Forward in "D" Position ..137
                                                                                 LINE PRESSURE TEST .................................. 206
                                                                                                                                    .
  Vehicle Cannot Be Started from D1 .....................140             .
                                                                                   Inspection and Judgment ..................................... 206
                                                                                                                                               .
  A/T Does Not Shift: D1D2 .................................142          .
  A/T Does Not Shift: D2D3 .................................143          .       ROAD TEST .................................................... 208
                                                                                                                                             .
  A/T Does Not Shift: D3D4 .................................145          .         Description ........................................................... 208
                                                                                                                                                         .
  A/T Does Not Shift: D4D5 .................................147          .         Check Before Engine Is Started ........................... 208        .
  A/T Does Not Perform Lock-up ............................149           .         Check At Idle ........................................................ 208
                                                                                                                                                         .
  A/T Does Not Hold Lock-up Condition ..................151              .         Cruise Test - Part 1 .............................................. 209
                                                                                                                                                         .
  Lock-up Is Not Released ......................................152      .         Cruise Test - Part 2 .............................................. 211
                                                                                                                                                         .
  Engine Speed Does Not Return to Idle ................153               .         Cruise Test - Part 3 .............................................. 212
                                                                                                                                                         .
  Cannot Be Changed to Manual Mode (Column                                         Vehicle Speed When Shifting Gears .................... 212            .
  Shift Models) .........................................................154
                                                                         .         Vehicle Speed When Performing and Releasing
  A/T Does Not Shift: 5th gear4th gear (Floor Shift                                Complete Lock-up ................................................ 212 .
  Models) .................................................................155
                                                                         .
  A/T Does Not Shift: 5th gear4th gear (Column                                   A/T POSITION ................................................. 213
                                                                                                                                             .
  Shift Models) .........................................................157
                                                                         .
  A/T Does Not Shift: 4th gear3rd gear (Floor Shift                              2WD ........................................................................ 213
                                                                                                                                                            .
  Models) .................................................................158
                                                                         .        2WD : Adjustment of A/T Position ........................ 213             .
  A/T Does Not Shift: 4th gear3rd gear (Column                                    2WD : Checking of A/T Position ........................... 213            .
  Shift Models) .........................................................160
                                                                         .       4WD ........................................................................ 213
                                                                                                                                                            .
  A/T Does Not Shift: 3rd gear2nd gear (Floor                                     4WD : Adjustment of A/T Position ........................ 213             .
  Shift Models) .........................................................161
                                                                         .        4WD : Checking of A/T Position ........................... 213            .
  A/T Does Not Shift: 3rd gear2nd gear (Column
  Shift Models) .........................................................163
                                                                         .       ON-VEHICLE REPAIR .............................. 215
  A/T Does Not Shift: 2nd gear1st gear (Floor
  Shift Models) .........................................................164
                                                                         .       SHIFT CONTROL SYSTEM ............................ 215
                                                                                                                                .
  A/T Does Not Shift: 2nd gear1st gear (Column                                     Control Device Removal and Installation ............. 215     .
  Shift Models) .........................................................166
                                                                         .         Adjustment of A/T Position ................................... 217
                                                                                                                                                 .
  Vehicle Does Not Decelerate By Engine Brake ....168                    .         Checking of A/T Position ...................................... 217
                                                                                                                                                 .
  Symptom Table ....................................................170  .
                                                                                 KEY INTERLOCK CABLE .............................. 218
                                                                                                                                 .
PRECAUTION ........................................... 192
                                                    .                              Component .......................................................... 218
                                                                                                                                                      .
                                                                                   Removal and Installation ...................................... 218.
PRECAUTIONS .............................................. 192
                                                         .
  Precaution for Supplemental Restraint System                                   AIR BREATHER HOSE ................................... 221
                                                                                                                                    .
  (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-                                          Removal and Installation ...................................... 221
                                                                                                                                                 .
  SIONER" ...............................................................192
                                                                       .
  Precautions for On Board Diagnosis (OBD) Sys-
                                                                                 OIL PAN ........................................................... 223
                                                                                                                                                  .
                                                                                   Oil Pan ................................................................. 223
                                                                                                                                                           .
  tem of A/T and Engine ..........................................192  .
  Precautions ...........................................................192
                                                                       .         CONTROL VALVE WITH TCM ....................... 225
                                                                                                                             .
  Service Notice or Precautions ..............................193      .           Control Valve with TCM and A/T Fluid Tempera-
                                                                                   ture Sensor 2 ....................................................... 225
                                                                                                                                                       .
PREPARATION ......................................... 195
                                                   .
                                                                                 REAR OIL SEAL ............................................. 234
                                                                                                                                          .
PREPARATION .............................................. 195
                                                         .
                                                                                   Rear Oil Seal ........................................................ 234
                                                                                                                                                        .
  Special Service Tool .............................................195
                                                                  .
  Commercial Service Tool .....................................196.              REMOVAL AND INSTALLATION ............. 235
ON-VEHICLE MAINTENANCE ................. 197
                                      .                                          TRANSMISSION ASSEMBLY ......................... 235
                                                                                                                              .
                                                                                   Removal and Installation (2WD) .......................... 235
                                                                                                                                           .
A/T FLUID ....................................................... 197
                                                                .
                                                                                   Removal and Installation (4WD) .......................... 237
                                                                                                                                           .
  Checking the A/T Fluid (ATF) ...............................197
                                                            .
  Changing the A/T Fluid (ATF) ...............................199
                                                            .                    DISASSEMBLY AND ASSEMBLY ........... 241
A/T FLUID COOLER ....................................... 201
                                                       .                         OVERHAUL ..................................................... 241
                                                                                                                                             .
  A/T Fluid Cooler Cleaning ....................................201
                                                              .                    Component .......................................................... 241
                                                                                                                                                      .

Revision: April 2007                                                        TM-4                                                                   2008 Titan
  Oil Channel .......................................................... 248
                                                                      .           Assembly (2) ......................................................... 305
                                                                                                                                                      .
  Location of Adjusting Shims, Needle Bearings,                                                                                                                       A
  Thrust Washers and Snap Rings ......................... 250         .         SERVICE DATA AND SPECIFICATIONS
                                                                                (SDS) ......................................................... 312
                                                                                                                                              .
DISASSEMBLY ............................................... 253
                                                         .
  Disassembly ......................................................... 253
                                                                     .          SERVICE DATA AND SPECIFICATIONS                                                       B
                                                                                (SDS) ............................................................... 312
REPAIR FOR COMPONENT PARTS ............. 271
                                      .                                           General Specification ........................................... 312      .
  Oil Pump .............................................................. 271
                                                                       .          Vehicle Speed at Which Gear Shifting Occurs ..... 312                      .        C
  Front Sun Gear, 3rd One-Way Clutch .................. 273            .          Vehicle Speed at Which Lock-up Occurs/Releas-
  Front Carrier, Input Clutch, Rear Internal Gear .... 275             .          es .......................................................................... 312
                                                                                                                                                             .
  Mid Sun Gear, Rear Sun Gear, High and Low Re-                                   Stall Speed ........................................................... 313.        TM
  verse Clutch Hub .................................................. 280
                                                                       .          Line Pressure ....................................................... 313  .
  High and Low Reverse Clutch .............................. 285       .          Turbine Revolution Sensor ................................... 313          .
  Direct Clutch ......................................................... 287
                                                                       .          Vehicle Speed Sensor A/T (Revolution Sensor) ... 313                       .
                                                                                                                                                                      E
ASSEMBLY ..................................................... 290
                                                            .                     Reverse Brake ...................................................... 313   .
                                                                                  Total End Play ...................................................... 313  .
  Assembly (1) ........................................................ 290
                                                                      .
                                                                                  Torque Converter ................................................. 314     .
  Adjustment ........................................................... 303
                                                                      .                                                                                               F


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Revision: April 2007                                                      TM-5                                                                      2008 Titan
                              DIAGNOSIS AND REPAIR WORKFLOW
< BASIC INSPECTION >
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow                                                                                  INFOID:0000000001672795




INTRODUCTION
The TCM receives a signal from the vehicle speed sensor, accelera-
tor pedal position sensor (throttle position sensor) or PNP switch.
Then provides shift control or lock-up control via A/T solenoid valves.
The TCM also communicates with the ECM by means of a signal
sent from sensing elements used with the OBD-related parts of the
A/T system for malfunction-diagnostic purposes. The TCM is capa-
ble of diagnosing malfunctioning parts while the ECM can store mal-
functions in its memory.
Input and output signals must always be correct and stable in the
operation of the A/T system. The A/T system must be in good oper-
ating condition and be free of valve seizure, solenoid valve malfunc-
                                                                                                     SAT631IB
tion, etc.

It is much more difficult to diagnose an error that occurs intermit-
tently rather than continuously. Most intermittent errors are caused
by poor electric connections or improper wiring. In this case, careful
checking of suspected circuits may help prevent the replacement of
good parts.
A visual check only may not find the cause of the errors. A road test
with CONSULT-III (or GST) or a circuit tester connected should be
performed. Follow the "DETAILED FLOW".


                                                                                                     SAT632I




Before undertaking actual checks, take a few minutes to talk with a
customer who approaches with a driveability complaint. The cus-
tomer can supply good information about such errors, especially
intermittent ones. Find out what symptoms are present and under
what conditions they occur. A "Diagnostic work sheet" as shown on
the example (Refer to TM-7) should be used.
Start your diagnosis by looking for "conventional" errors first. This will
help troubleshoot driveability errors on an electronically controlled
engine vehicle.
Also check related Service bulletins.
                                                                                                     SEF234G


DETAILED FLOW
1.COLLECT THE INFORMATION FROM THE CUSTOMER
Get the detailed information from the customer about the symptom (the condition and the environment when
the incident/malfunction occurred) using diagnosis worksheet. Refer to TM-7, "Diagnostic Work Sheet".

         >> GO TO 2.
2.CHECK SYMPTOM 1
Check the following items based on the information obtained from the customer.



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