Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Infiniti G37 2008 Coupe Approved Infiniti G37 Coupe 2008 stc
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STEERING
A
SECTION
STEERING CONTROL SYSTEM
STC B
C
D
E
CONTENTS
WITHOUT 4WAS SYMPTOM DIAGNOSIS ............................. 22
. F
BASIC INSPECTION ................................... 6
. UNBALANCE STEERING WHEEL TURNING
FORCE (TORQUE VARIATION) ....................... 22 STC
DIAGNOSIS AND REPAIR WORKFLOW ......... 6
. Description ..............................................................22
.
Work Flow ................................................................ 6
. Diagnosis Procedure ..............................................22 .
FUNCTION DIAGNOSIS .............................. 7
. PRECAUTION ............................................. 23
. H
EPS SYSTEM ..................................................... 7
. PRECAUTIONS ................................................. 23
System Diagram ....................................................... 7
. Precaution for Supplemental Restraint System I
System Description .................................................. 7
. (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
Component Parts Location ....................................... 9
. SIONER" ................................................................23
.
Component Description ............................................ 9
. Precaution Necessary for Steering Wheel Rota-
J
tion after Battery Disconnect ..................................23 .
COMPONENT DIAGNOSIS ........................ 10
.
ON-VEHICLE REPAIR ................................ 24
.
POWER SUPPLY AND GROUND CIRCUIT .....10
.
K
Description ............................................................. 10
. POWER STEERING CONTROL UNIT .............. 24
Diagnosis Procedure .............................................. 10. Exploded View ........................................................24
.
Removal and Installation ........................................24
.
POWER STEERING SOLENOID VALVE .........11
. L
Description ............................................................. 11
. WITH 4WAS
Diagnosis Procedure .............................................. 11.
BASIC INSPECTION .................................. 25
.
Component Inspection ........................................... 12 . M
DIAGNOSIS AND REPAIR WORKFLOW ........ 25
ENGINE SPEED SIGNAL CIRCUIT ..................13
.
Work Flow ...............................................................25
.
Description ............................................................. 13
.
Diagnosis Procedure .............................................. 13. INSPECTION AND ADJUSTMENT .................. 27 N
VEHICLE SPEED SIGNAL CIRCUIT ................15
. ADDITIONAL SERVICE WHEN REPLACING
Description ............................................................. 15
. CONTROL UNIT .......................................................27
. O
Diagnosis Procedure .............................................. 15. ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT : Description ................................27 .
ECU DIAGNOSIS ........................................ 17
.
4WAS FRONT ACTUATOR NEUTRAL POSITION P
POWER STEERING CONTROL UNIT ..............17
. ADJUSTMENT ..........................................................27
.
Reference Value .................................................... 17. 4WAS FRONT ACTUATOR NEUTRAL POSI-
Wiring Diagram - ELECTRONICALLY CON- TION ADJUSTMENT : Description .........................27 .
TROLLED POWER STEERING SYSTEM - ........... 18 . 4WAS FRONT ACTUATOR NEUTRAL POSI-
Fail Safe ................................................................. 20
. TION ADJUSTMENT : Special Repair Require-
ment (Pattern 1) ......................................................27
.
Revision: 2007 June STC-1 G37 Coupe
4WAS FRONT ACTUATOR NEUTRAL POSI- Diagnosis Procedure .............................................. 55
.
TION ADJUSTMENT : Special Repair Require- Special Repair Requirement .................................. 56
.
ment (Pattern 2) ..................................................... 28
.
4WAS FRONT ACTUATOR NEUTRAL POSI- C1633 4WAS FRONT CONTROL UNIT ........... 58
.
TION ADJUSTMENT : Special Repair Require- Description ............................................................. 58
.
ment (Pattern 3) ..................................................... 28
. DTC Logic .............................................................. 58
.
4WAS FRONT ACTUATOR NEUTRAL POSI- Diagnosis Procedure .............................................. 58 .
TION ADJUSTMENT : Special Repair Require- Special Repair Requirement .................................. 59 .
ment (Pattern 4) ..................................................... 30
.
C1651 IGNITION POWER SUPPLY ................. 60
.
FUNCTION DIAGNOSIS ............................ 32
. Description ............................................................. 60
.
DTC Logic .............................................................. 60
.
4WAS SYSTEM ................................................ 32
. Diagnosis Procedure .............................................. 60 .
System Diagram .................................................... 32
. Special Repair Requirement .................................. 61 .
System Description ................................................ 33
.
Component Parts Location .................................... 35. C1652 4WAS FRONT MOTOR POWER SUP-
Component Description ......................................... 36
. PLY ................................................................... 62
.
Description ............................................................. 62
.
EPS SYSTEM ................................................... 37
. DTC Logic .............................................................. 62
.
System Diagram .................................................... 37
. Diagnosis Procedure .............................................. 62 .
System Description ................................................ 37
. Special Repair Requirement .................................. 63 .
Component Parts Location .................................... 38.
Component Description ......................................... 38
. C1654 4WAS FRONT ACTUATOR RELAY .... 64
.
Description ............................................................. 64
.
DIAGNOSIS SYSTEM (4WAS FRONT CON- DTC Logic .............................................................. 64
.
TROL UNIT) ...................................................... 39
. Diagnosis Procedure .............................................. 64 .
CONSULT-III Function [4WAS(FRONT)] ............... 39
. Special Repair Requirement .................................. 65 .
DIAGNOSIS SYSTEM (4WAS MAIN CON- C1655 4WAS FRONT DRIVER ........................ 66
.
TROL UNIT) ...................................................... 43
. Description ............................................................. 66
.
CONSULT-III Function [4WAS(MAIN)/RAS/HI- DTC Logic .............................................................. 66
.
CAS] ...................................................................... 43
. Diagnosis Procedure .............................................. 66 .
Special Repair Requirement .................................. 66 .
COMPONENT DIAGNOSIS ....................... 47
.
C1661 4WAS FRONT LOCK SOLENOID
C1621, C1622 4WAS FRONT ACTUATOR ..... 47
. VALVE .............................................................. 68
.
Description ............................................................. 47
. Description ............................................................. 68
.
DTC Logic .............................................................. 47
. DTC Logic .............................................................. 68
.
Diagnosis Procedure ............................................. 47 . Diagnosis Procedure .............................................. 68 .
Component Inspection (4WAS Front Motor) ......... 48 . Component Inspection (4WAS Front Lock Sole-
Special Repair Requirement .................................. 49 . noid Valve) ............................................................. 69
.
Special Repair Requirement .................................. 69 .
C1627 4WAS FRONT ACTUATOR .................. 50
.
Description ............................................................. 50
. C1667 LOCK INSERTION ................................ 70
.
DTC Logic .............................................................. 50
. Description ............................................................. 70
.
Diagnosis Procedure ............................................. 50 . DTC Logic .............................................................. 70
.
Special Repair Requirement .................................. 51 . Diagnosis Procedure .............................................. 70 .
Special Repair Requirement .................................. 71 .
C1628 4WAS FRONT ACTUATOR .................. 52
.
Description ............................................................. 52
. C1668 LOCK HOLDER GAP DETECT ............ 72
.
DTC Logic .............................................................. 52
. Description ............................................................. 72
.
Diagnosis Procedure ............................................. 52 . DTC Logic .............................................................. 72
.
Component Inspection (Front Wheel Steering An- Diagnosis Procedure .............................................. 72 .
gle Sensor) ............................................................ 53
. Special Repair Requirement .................................. 72 .
Special Repair Requirement .................................. 54 .
C1669 INCOMPLETE LOCK RELEASE .......... 73
.
C1631, C1632 4WAS FRONT CONTROL Description ............................................................. 73
.
UNIT .................................................................. 55
. DTC Logic .............................................................. 73
.
Description ............................................................. 55
. Diagnosis Procedure .............................................. 73 .
DTC Logic .............................................................. 55
. Special Repair Requirement .................................. 73 .
Revision: 2007 June STC-2 G37 Coupe
C1671 ACTUATOR ADJUSTMENT NOT Special Repair Requirement ...................................91
.
PERFORMED ....................................................74
. A
Description ............................................................. 74
.
C1905, C1908, C1922, C1925, C1928 4WAS
DTC Logic .............................................................. 74
. MAIN CONTROL UNIT ..................................... 92
Diagnosis Procedure .............................................. 74. Description ..............................................................92
.
B
Special Repair Requirement .................................. 74 . DTC Logic ...............................................................92
.
Diagnosis Procedure ..............................................92 .
C1672 INCOMPLETE ACTUATOR ADJUST- Special Repair Requirement ...................................93 .
MENT .................................................................76
. C
Description ............................................................. 76
.
C1909 4WAS MAIN CONTROL UNIT .............. 94
DTC Logic .............................................................. 76
. Description ..............................................................94
.
Diagnosis Procedure .............................................. 76. DTC Logic ...............................................................94
. D
Special Repair Requirement .................................. 76 . Diagnosis Procedure ..............................................94 .
Special Repair Requirement ...................................95 .
C1684, C1685 4WAS MAIN CONTROL UNIT
C1911, C1912 4WAS REAR MOTOR POWER E
COMMUNICATION ............................................77
.
Description ............................................................. 77
.
SUPPLY ............................................................ 96
Description ..............................................................96
.
DTC Logic .............................................................. 77
.
DTC Logic ...............................................................96
. F
Diagnosis Procedure .............................................. 77.
Diagnosis Procedure ..............................................96 .
Component Inspection [ABS Actuator and Electric
Component Inspection (4WAS Rear Motor Relay) 99 ....
Unit (Control Unit)] ................................................. 79
.
Component Inspection (Noise Suppressor) .......... 100 .
Component Inspection (Yaw Rate/Side G Sensor) STC
Special Repair Requirement ................................. 100 .
.... 79
Special Repair Requirement .................................. 80 . C1914 REAR WHEEL STEERING ANGLE
C1686 4WAS MAIN CONTROL UNIT ...............81
. SENSOR .......................................................... 101 H
Description ............................................................. 81
. Description ............................................................ 101
.
DTC Logic .............................................................. 81
. DTC Logic ............................................................. 101
.
Diagnosis Procedure .............................................. 81. Diagnosis Procedure ............................................ 101 . I
Component Inspection .......................................... 102 .
U1000, U1002 4WAS COMMUNICATION Special Repair Requirement ................................. 103 .
CIRCUIT ............................................................82
. J
Description ............................................................. 82
.
C1915, C1916 REAR WHEEL STEERING AN-
DTC Logic .............................................................. 82
. GLE SENSOR ................................................. 104
Diagnosis Procedure .............................................. 82. Description ............................................................ 104
.
Component Inspection [ABS Actuator and Electric DTC Logic ............................................................. 104
. K
Unit (Control Unit)] ................................................. 84
. Diagnosis Procedure ............................................ 104 .
Component Inspection (Yaw Rate/Side G Sensor) Component Inspection .......................................... 106 .
.... 84 Special Repair Requirement ................................. 106 . L
Special Repair Requirement .................................. 85 . C1917, C1918 REAR WHEEL STEERING AN-
U1010 4WAS COMMUNICATION CIRCUIT .....86
. GLE SENSOR ................................................. 107
Description ............................................................. 86
. Description ............................................................ 107
. M
DTC Logic .............................................................. 86
. DTC Logic ............................................................. 107
.
Diagnosis Procedure .............................................. 86. Diagnosis Procedure ............................................ 107 .
Special Repair Requirement .................................. 86 . Component Inspection .......................................... 109 . N
Special Repair Requirement ................................. 109 .
C1900, C1901, C1906, C1907, C1927, C1933
4WAS MAIN CONTROL UNIT ..........................87
. C1919 VEHICLE SPEED SIGNAL .................. 110
Description ............................................................ 110
. O
Description ............................................................. 87
.
DTC Logic .............................................................. 87
. DTC Logic ............................................................. 110
.
Diagnosis Procedure .............................................. 87. Diagnosis Procedure ............................................ 110 .
Special Repair Requirement .................................. 88 . Special Repair Requirement ................................. 111 . P
C1902, C1903, C1904, C1910, C1913 4WAS C1920 STEERING ANGLE SEN ..................... 112
REAR MOTOR OUTPUT ...................................89
. Description ............................................................ 112
.
Description ............................................................. 89
. DTC Logic ............................................................. 112
.
DTC Logic .............................................................. 89
. Diagnosis Procedure ............................................ 112 .
Diagnosis Procedure .............................................. 89. Special Repair Requirement ................................. 113 .
Component Inspection (4WAS Rear Motor) ........... 90 . C1921 ENGINE SPEED SIGNAL .................... 115
Revision: 2007 June STC-3 G37 Coupe
Description ............................................................115
. Component Inspection ......................................... 139
.
DTC Logic .............................................................115
.
Diagnosis Procedure ............................................115 . 4WAS WARNING LAMP ................................. 140
.
Special Repair Requirement .................................116 . Description ........................................................... 140
.
Diagnosis Procedure ............................................ 140 .
C1923 STEERING ANGLE SEN .................... 117
. Special Repair Requirement ................................ 141 .
Description ............................................................117
.
DTC Logic .............................................................117
. ECU DIAGNOSIS ...................................... 142
Diagnosis Procedure ............................................117 .
Special Repair Requirement .................................118 .
4WAS FRONT CONTROL UNIT ..................... 142
.
Reference Value .................................................. 142 .
C1924 STEERING ANGLE SEN .................... 120
. Wiring Diagram - 4WAS SYSTEM - ..................... 145 .
Description ............................................................120
. Fail Safe ............................................................... 151
.
DTC Logic .............................................................120
. DTC Inspection Priority Chart .............................. 152 .
Diagnosis Procedure ............................................120 . DTC Index ............................................................ 153
.
Special Repair Requirement .................................121 .
4WAS MAIN CONTROL UNIT ........................ 155
.
C1926, C1932 STEERING ANGLE SENSOR . 123 Reference Value .................................................. 155 .
Description ............................................................123
. Wiring Diagram - 4WAS SYSTEM - ..................... 157 .
DTC Logic .............................................................123
. Fail Safe ............................................................... 163
.
Diagnosis Procedure ............................................123 . DTC Inspection Priority Chart .............................. 165 .
Special Repair Requirement .................................124 . DTC Index ............................................................ 166
.
C1930 4WAS FRONT CONTROL UNIT ......... 126
. SYMPTOM DIAGNOSIS ........................... 168
Description ............................................................126
.
DTC Logic .............................................................126
. 4WAS SYMPTOMS ......................................... 168
.
Diagnosis Procedure ............................................126 . Symptom Table .................................................... 168
.
C1931 4WAS FRONT CONTROL UNIT COM- 4WAS WARNING LAMP DOES NOT TURN
MUNICATION ................................................. 127
. ON .................................................................... 169
.
Description ............................................................127
. Description ........................................................... 169
.
DTC Logic .............................................................127
. Diagnosis Procedure ............................................ 169 .
Diagnosis Procedure ............................................127 . 4WAS WARNING LAMP DOES NOT TURN
Component Inspection [ABS Actuator and Electric
OFF .................................................................. 170
.
Unit (Control Unit)] ................................................129
.
Description ........................................................... 170
.
Component Inspection (Yaw Rate/Side G Sensor)
Diagnosis Procedure ............................................ 170 .
..129
Special Repair Requirement .................................130 . STEERING WHEEL MISS ALIGNMENT ......... 171
.
Description ........................................................... 171
.
U1000 CAN COMM CIRCUIT ......................... 131
.
Diagnosis Procedure ............................................ 171 .
Description ............................................................131
.
DTC Logic .............................................................131
. STEERING SYSTEM VIBRATION AND
Diagnosis Procedure ............................................131 . NOISE .............................................................. 173
.
Special Repair Requirement .................................131 . Description ........................................................... 173
.
U1010 CONTROL UNIT (CAN) ...................... 132
. Diagnosis Procedure ............................................ 173 .
Description ............................................................132
. UNBALANCE STEERING WHEEL TURNING
DTC Logic .............................................................132
. FORCE (TORQUE VARIATION) ..................... 174
.
Diagnosis Procedure ............................................132 .
Description ........................................................... 174
.
Special Repair Requirement .................................132 .
Diagnosis Procedure ............................................ 174 .
POWER SUPPLY AND GROUND CIRCUIT .. 133
.
PRECAUTION ........................................... 175
Description ............................................................133
.
Diagnosis Procedure (4WAS Front Control Unit) ..133 PRECAUTIONS ............................................... 175
.
Diagnosis Procedure (4WAS Main Control Unit) ..134 Precaution for Supplemental Restraint System
Component Inspection (4WAS Rear Motor Relay) 136 .. (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
Component Inspection (Noise Suppressor) ..........137 . SIONER" .............................................................. 175
.
Precaution Necessary for Steering Wheel Rota-
POWER STEERING SOLENOID VALVE ....... 138
.
tion after Battery Disconnect ................................ 175 .
Description ............................................................138
.
Diagnosis Procedure ............................................138 .
Revision: 2007 June STC-4 G37 Coupe
Precautions for Removal and Installation of 4WAS 4WAS MAIN CONTROL UNIT ........................ 178
Components ......................................................... 175
. Exploded View ...................................................... 178
. A
Precautions for Harness Repair ........................... 176 . Removal and Installation ...................................... 178
.
ON-VEHICLE REPAIR .............................. 177
. 4WAS FRONT ACTUATOR ASSEMBLY ....... 179
B
Removal and Installation ...................................... 179
.
4WAS FRONT CONTROL UNIT ..................... 177
.
Exploded View ..................................................... 177
. 4WAS REAR ACTUATOR ASSEMBLY ......... 180
Removal and Installation ...................................... 177
. Exploded View ...................................................... 180
. C
Removal and Installation ...................................... 180
.
D
E
F
STC
H
I
J
K
L
M
N
O
P
Revision: 2007 June STC-5 G37 Coupe
DIAGNOSIS AND REPAIR WORKFLOW
< BASIC INSPECTION > [WITHOUT 4WAS]
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow INFOID:0000000001666266
DETAILED FLOW
1.COLLECT THE INFORMATION FROM THE CUSTOMER
It is also important to clarify customer complaints before inspection. First of all, reproduce symptoms, and
understand them fully. Ask customer about his/her complaints carefully. In some cases, it is necessary to
check symptoms by driving vehicle with customer.
CAUTION:
Customers are not professional. It is dangerous to make an easy guess like "maybe the customer
means that...," or "maybe the customer mentions this symptom".
>> GO TO 2.
2.CHECK THE STATUS
1. Power steering fluid leakage and check the power steering fluid level. Refer to ST-10, "Inspection".
2. Check the drive belt tension. Refer to EM-12, "Checking".
3. Check the power steering gear for damages, cracks and fluid leakage. Refer to ST-10, "Inspection".
4. Check the relief oil pressure. Refer to ST-32, "Inspection".
>> GO TO 3.
3.DIAGNOSIS CHART BY SYMPTOM
Perform the diagnosis by symptom. Refer to STC-22, "Diagnosis Procedure".
>> GO TO 4.
4.FINAL CHECK
Check the input/output standard values for the power steering control unit.
Are the power steering control unit input/output values within standard ranges respectively?
YES >> INSPECTION END
NO >> GO TO 2.
Revision: 2007 June STC-6 G37 Coupe
EPS SYSTEM
< FUNCTION DIAGNOSIS > [WITHOUT 4WAS]
FUNCTION DIAGNOSIS A
EPS SYSTEM
System Diagram INFOID:0000000001666267
B
CONTROL DIAGRAM
C
D
E
F
STC
H
JSGIA0258GB
CROSS-SECTIONAL VIEW
I
J
K
L
M
N
SGIA1389E
1. Unified meter and A/C amp. 2. Power steering control unit 3. Power steering solenoid valve
O
4. Steering gear assembly 5. Gear housing assembly 6. Gear sub-assembly
7. Pinion 8. Power steering oil pump 9. Reservoir tank
System Description INFOID:0000000001686405 P
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