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BRC

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F BRAKES

SECTION
BRAKE CONTROL SYSTEM
BRC B

E
CONTENTS
ABS Warning Lamp and Indicator Timing ...................... 21 . BRC
Control Unit Input/Output Signal Standard ............ 21 .
PRECAUTIONS ......................................................... 4
. REFERENCE VALUE FROM CONSULT-II ........ 21 .
Precautions for Supplemental Restraint System CONSULT-II Function (ABS) ................................. 23 . G
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- CONSULT-II BASIC OPERATION PROCEDURE
SIONER" ................................................................. 4
. ... 23
Precautions for Brake System ................................. 4 . SELF-DIAGNOSIS ............................................. 24 .
Precautions When Using CONSULT-II .................... 4 . H
DATA MONITOR ................................................ 26 .
CHECK POINTS FOR USING CONSULT-II ........ 4 . ACTIVE TEST .................................................... 27 .
Precautions for Brake Control ................................. 5 . TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC
Precautions for CAN System .................................. 5 . ITEMS ....................................................................... 29
. I
Wiring Diagrams and Trouble Diagnosis ................. 6 . Wheel Sensor System ........................................... 29 .
PREPARATION .......................................................... 7
. ABS Control Unit Inspection .................................. 30 .
Special Service Tool ................................................ 7
. Solenoid Valve System Inspection ........................ 30 . J
Commercial Service Tools ....................................... 7 . Actuator Motor, Motor Relay, and Circuit Inspection 31 ...
SYSTEM DESCRIPTION ........................................... 8 . Stop Lamp Switch System Inspection ................... 32 .
System Components ............................................... 8 . ABS Control Unit Power and Ground Systems
ABS Function .......................................................... 8
. K
Inspection .............................................................. 33
.
EBD Function .......................................................... 8
. CAN Communication System Inspection ............... 34 .
Fail-Safe Function ................................................... 8
. TROUBLE DIAGNOSES FOR SYMPTOMS ........... 35 .
ABS/EBD SYSTEM .............................................. 8 . Symptom 1: ABS Works Frequently ...................... 35 . L
Hydraulic Circuit Diagram ....................................... 9 . Symptom 2: Unexpected Pedal Reaction .............. 36 .
CAN COMMUNICATION ......................................... 10 . Symptom 3: The Braking Distance is Long ........... 37 .
System Description ............................................... 10
. Symptom 4: ABS Does Not Work .......................... 37 . M
TROUBLE DIAGNOSIS ............................................11 . Symptom 5: Pedal Vibration or ABS Operation
How to Perform Trouble Diagnoses for Quick and Noise ..................................................................... 38
.
Accurate Repair .....................................................11
. ABS Warning Lamp Does Not Come On When Igni-
INTRODUCTION .................................................11 . tion Switch Is Turned On ....................................... 40 .
WORK FLOW ..................................................... 12. ABS Warning Lamp Stays On When Ignition Switch
CLARIFY CONCERN ......................................... 13 . Is Turned On .......................................................... 40
.
EXAMPLE OF DIAGNOSIS SHEET .................. 13 . WHEEL SENSORS .................................................. 41 .
Component Parts and Harness Connector Location 14 ... Removal and Installation ....................................... 41 .
Schematic ............................................................. 15
. REMOVAL .......................................................... 41.
Wiring Diagram -- ABS -- .................................... 16 . INSTALLATION .................................................. 41 .
Basic Inspection .................................................... 20
. SENSOR ROTOR .................................................... 42 .
BRAKE FLUID LEVEL, FLUID LEAK, AND Removal and Installation ....................................... 42 .
BRAKE PAD INSPECTION ................................ 20 . FRONT ............................................................... 42
.
POWER SYSTEM TERMINAL LOOSENESS REAR ................................................................. 42
.
AND BATTERY INSPECTION ........................... 20 .
ABS WARNING LAMP INSPECTION ................ 20 .

Revision: January 2005 BRC-1 2004 Titan
ACTUATOR AND ELECTRIC UNIT (ASSEMBLY) ... 43 ITEMS .......................................................................75
.
Removal and Installation ....................................... 43
. Wheel Sensor System Inspection ..........................75 .
REMOVAL .......................................................... 43
. Engine System Inspection .....................................76 .
INSTALLATION ................................................... 44
. ABS/ABLS Control Unit Inspection ........................77 .
Solenoid and Change-Over Valve System Inspec-
ABLS/ABS tion .........................................................................77
.
Actuator Motor, Motor Relay, and Circuit Inspection...78
PRECAUTIONS ........................................................ 45
. Stop Lamp Switch System Inspection ....................79 .
Precautions for Supplemental Restraint System ABS/ABLS Control Unit Power and Ground Sys-
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- tems Inspection ......................................................80 .
SIONER" ................................................................ 45
. Brake Fluid Level Switch System Inspection .........81 .
Precautions for Brake System ............................... 45 . Pressure Sensor System Inspection ......................81 .
Precautions When Using CONSULT-II .................. 45 . CAN Communication System Inspection ...............84 .
CHECK POINTS FOR USING CONSULT-II ....... 45 . TROUBLE DIAGNOSES FOR SYMPTOMS ............85 .
Precautions for Brake Control ............................... 46 . ABS Works Frequently ...........................................85 .
Precautions for CAN System ................................. 46 . Unexpected Pedal Action .......................................86 .
Wiring Diagrams and Trouble Diagnosis ............... 47 . Long Stopping Distance .........................................87 .
PREPARATION ........................................................ 48
. ABS Does Not Work ..............................................87 .
Special Service Tool .............................................. 48
. Pedal Vibration or ABS Operation Noise ...............87 .
Commercial Service Tools ..................................... 48 . ABS Warning Lamp Does Not Come On When Igni-
SYSTEM DESCRIPTION ......................................... 49 . tion Switch Is Turned On ........................................88 .
System Components ............................................. 49 . ABS Warning Lamp Stays On When Ignition Switch
ABS Function ......................................................... 50
. Is Turned On ..........................................................88 .
EBD Function ........................................................ 50
. WHEEL SENSORS ..................................................89 .
ABLS Function ....................................................... 50
. Removal and Installation ........................................89 .
Fail-Safe Function ................................................. 50
. REMOVAL ...........................................................89 .
ABS/EBD SYSTEM ............................................ 50 . INSTALLATION ...................................................89 .
ABLS SYSTEM ................................................... 50 . SENSOR ROTOR .....................................................90 .
Hydraulic Circuit Diagram ...................................... 51 . Removal and Installation ........................................90 .
CAN COMMUNICATION .......................................... 52 . FRONT ................................................................90.
System Description ................................................ 52
. REAR ..................................................................90
.
TROUBLE DIAGNOSIS ........................................... 53 . ACTUATOR AND ELECTRIC UNIT (ASSEMBLY) ...91
How to Perform Trouble Diagnoses for Quick and Removal and Installation ........................................91 .
Accurate Repair ..................................................... 53
. REMOVAL ...........................................................91 .
INTRODUCTION ................................................ 53 . INSTALLATION ...................................................92 .
WORK FLOW ..................................................... 54 .
CLARIFY CONCERN ......................................... 55 . VDC/TCS/ABS
EXAMPLE OF DIAGNOSIS SHEET ................... 55 .
Component Parts and Harness Connector Location 56 ... PRECAUTIONS ........................................................93.
Schematic .............................................................. 57
. Precautions for Supplemental Restraint System
Wiring Diagram -- ABLS -- .................................. 58 . (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
Basic Inspection .................................................... 62
. SIONER" ................................................................93
.
BRAKE FLUID LEVEL, FLUID LEAK, AND Precautions for Brake System ...............................93 .
BRAKE PAD INSPECTION ................................ 62 . Precautions When Using CONSULT-II ..................93 .
POWER SYSTEM TERMINAL LOOSENESS CHECK POINTS FOR USING CONSULT-II .......93 .
AND BATTERY INSPECTION ............................ 62 . Precautions for Brake Control ................................94 .
ABS WARNING LAMP AND B-LSD (EARLY Precautions for CAN System .................................94 .
PRODUCTION) OR SLIP (LATE PRODUCTION) Wiring Diagrams and Trouble Diagnosis ................95 .
INDICATOR LAMP INSPECTION ...................... 62 . PREPARATION ........................................................96.
Warning Lamp and Indicator Timing ...................... 63 . Special Service Tool ...............................................96
.
Control Unit Input/Output Signal Standard ............. 63 . Commercial Service Tools .....................................96 .
REFERENCE VALUE FROM CONSULT-II ........ 63 . SYSTEM DESCRIPTION ..........................................97 .
CONSULT-II Function (ABS) ................................. 66 . System Components ..............................................97 .
CONSULT-II BASIC OPERATION PROCEDURE ABS Function .........................................................98
.
... 66 EBD Function .........................................................98
.
SELF-DIAGNOSIS ............................................. 67 . TCS Function .........................................................98
.
DATA MONITOR ................................................. 70 . VDC Function .........................................................98
.
ACTIVE TEST .................................................... 73. Fail-Safe Function ..................................................98
.
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ABS/EBD SYSTEM .............................................99 .

Revision: January 2005 BRC-2 2004 Titan
VDC/TCS SYSTEM ............................................ 99 . Active Booster System Inspection ....................... 138 .
ACTIVE BOOSTER ............................................ 99 . Delta Stroke Sensor System Inspection .............. 139 . A
Hydraulic Circuit Diagram ..................................... 99 . Pressure Sensor System Inspection ................... 141 .
CAN COMMUNICATION ....................................... 100 . Steering Angle Sensor Safe Mode Inspection ..... 143 .
System Description ............................................. 100 . CAN Communication System Inspection ............. 144 . B
TROUBLE DIAGNOSIS ......................................... 101 . Inspection For Self-diagnosis Result "ST ANGLE
How to Perform Trouble Diagnoses for Quick and SEN SIGNAL" ...................................................... 144 .
Accurate Repair .................................................. 101 . Inspection For Self-diagnosis Result "DECEL G
INTRODUCTION .............................................. 101 . SEN SET" ............................................................ 144 . C
WORK FLOW ................................................... 102 . VDC OFF Indicator lamp Does Not Illuminate ..... 145 .
CLARIFY CONCERN ....................................... 103 . Component Inspection ......................................... 145 .
EXAMPLE OF DIAGNOSIS SHEET ................ 103 . VDC OFF SWITCH .......................................... 145 . D
Component Parts and Harness Connector Location 104 . TROUBLE DIAGNOSES FOR SYMPTOMS ......... 146 .
Schematic ........................................................... 105
. ABS Works Frequently ........................................ 146 .
Wiring Diagram -- VDC -- .................................. 106 . Unexpected Pedal Action .................................... 147 . E
Basic Inspection ...................................................113. Long Stopping Distance ....................................... 148 .
BRAKE FLUID LEVEL, FLUID LEAK, AND ABS Does Not Work ............................................ 148 .
BRAKE PAD INSPECTION ...............................113 . Pedal Vibration or ABS Operation Noise ............. 148 .
POWER SYSTEM TERMINAL LOOSENESS ABS Warning Lamp Does Not Come On When Igni- BRC
AND BATTERY INSPECTION ..........................113 . tion Switch Is Turned On ..................................... 149 .
ABS WARNING LAMP, SLIP INDICATOR LAMP ABS Warning Lamp Stays On When Ignition Switch
AND VDC OFF INDICATOR LAMP INSPECTION ..113 Is Turned On ........................................................ 149 . G
Warning Lamp and Indicator Timing ....................114 . Vehicle Jerks During TCS/VDC Activation .......... 150 .
Control Unit Input/Output Signal Standard ...........114 . ON-VEHICLE SERVICE ......................................... 151 .
REFERENCE VALUE FROM CONSULT-II .......114 . Adjustment of Steering Angle Sensor Neutral Posi- H
CONSULT-II Function (ABS) ................................118 . tion ....................................................................... 151
.
CONSULT-II BASIC OPERATION PROCEDURE Calibration of Decel G Sensor ............................. 151 .
..118 WHEEL SENSORS ................................................ 153 .
I
SELF-DIAGNOSIS ............................................119 . Removal and Installation ..................................... 153 .
DATA MONITOR .............................................. 122 . REMOVAL ........................................................ 153 .
ACTIVE TEST .................................................. 126 . INSTALLATION ................................................ 153 .
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC SENSOR ROTOR .................................................. 154 . J
ITEMS .................................................................... 128
. Removal and Installation ..................................... 154 .
Wheel Sensor System Inspection ....................... 128 . FRONT ............................................................. 154 .
Engine System Inspection ................................... 129 . REAR ............................................................... 154. K
ABS/TCS/VDC Control Unit Inspection ............... 130 . ACTUATOR AND ELECTRIC UNIT (ASSEMBLY). 155
Steering Angle Sensor System ........................... 130 . Removal and Installation ..................................... 155 .
Yaw Rate/Side/Decel G Sensor System Inspection 131 . REMOVAL ........................................................ 155 .
L
Solenoid and VDC Change-Over Valve System INSTALLATION ................................................ 156 .
Inspection ............................................................ 133
. STEERING ANGLE SENSOR ............................... 157 .
Actuator Motor, Motor Relay, and Circuit Inspection 134 . Removal and Installation ..................................... 157 .
Stop Lamp Switch System Inspection ................. 135 . G SENSOR ............................................................. 158 . M
ABS/TCS/VDC Control Unit Power and Ground Removal and Installation ..................................... 158 .
Systems Inspection ............................................. 136 . REMOVAL ........................................................ 158 .
Brake Fluid Level Sensor System Inspection ...... 137 . INSTALLATION ................................................ 158 .

Revision: January 2005 BRC-3 2004 Titan
PRECAUTIONS
[ABS]
PRECAUTIONS PFP:00001

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EFS005T8

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING:
q To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.
q Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.
q Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
Precautions for Brake System EFS003L4

CAUTION:
q Refer to MA-11, "RECOMMENDED FLUIDS AND LUBRICANTS" for recommended brake fluid.
q Never reuse drained brake fluid.
q Be careful not to splash brake fluid on painted areas; it may cause paint damage. If brake fluid is
splashed on painted areas, wash it away with water immediately.
q To clean or wash all parts of master cylinder and disc brake caliper, use clean brake fluid.
q Never use mineral oils such as gasoline or kerosene. They will ruin rubber parts of the hydraulic
system.
q Use flare nut wrench when removing and installing brake
tube.
q If a brake fluid leak is found, the part must be disassembled
without fail. Then it has to be replaced with a new one if a
defect exists.
q Turn the ignition switch OFF and remove the connector of
the ABS actuator and electric unit (control unit) or the bat-
tery terminal before performing the work.
q Always torque brake lines when installing.
q Burnish the brake contact surfaces after refinishing or SBR686C
replacing rotors, after replacing pads, or if a soft pedal
occurs at very low mileage.
Refer to BR-27, "BRAKE BURNISHING PROCEDURE" (front disc brake) or BR-33, "BRAKE BUR-
NISHING PROCEDURE" (rear disc brake).
WARNING:
q Clean brake pads and shoes with a waste cloth, then wipe with a dust collector.
Precautions When Using CONSULT-II EFS003L5

When connecting CONSULT-II to data link connector, connect them through CONSULT-II CONVERTER.
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carry out CAN communication.
CHECK POINTS FOR USING CONSULT-II
1. Has CONSULT-II been used without connecting CONSULT-II CONVERTER on this vehicle?
q If YES, GO TO 2.

Revision: January 2005 BRC-4 2004 Titan
PRECAUTIONS
[ABS]
q If NO, GO TO 5.
2. Is there any indication other than indications relating to CAN communication system in the self-diagnosis A
results?
q If YES, GO TO 3.

q If NO, GO TO 4. B
3. Based on self-diagnosis results unrelated to CAN communication, carry out the inspection.
4. Malfunctions may be detected in self-diagnosis depending on control units carrying out CAN communica-
tion. Therefor, erase the self-diagnosis results. C
5. Diagnose CAN communication system. Refer to BRC-10, "CAN COMMUNICATION" .
Precautions for Brake Control EFS003L6 D
q During ABS operation, the brake pedal may vibrate lightly and a mechanical noise may be heard. This is
normal.
q Just after starting vehicle, the brake pedal may vibrate or a motor operating noise may be heard from E
engine compartment. This is a normal status of operation check.
q Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel,
or snow-covered (fresh, deep snow) roads. BRC
q When an error is indicated by ABS or another warning lamp, collect all necessary information from cus-
tomer (what symptoms are present under what conditions) and check for simple causes before starting
diagnosis. Besides electrical system inspection, check brake booster operation, brake fluid level, and fluid G
leaks.
q If incorrect tire sizes or types are installed on the vehicle or brake pads are not Genuine NISSAN parts,
stopping distance or steering stability may deteriorate. H
q If there is a radio, antenna or related wiring near control module, ABS function may have a malfunction or
error.
q If aftermarket parts (car stereo, CD player, etc.) have been installed, check for incidents such as harness I
pinches, open circuits or improper wiring.
Precautions for CAN System EFS003L7

q Do not apply voltage of 7.0V or higher to terminal to be measured. J
q Maximum open terminal voltage of tester in use must be less than 7.0V.
q Before checking harnesses, turn ignition switch OFF and disconnect battery negative cable.
K
q Area to be repaired must be soldered and wrapped with tape.
Make sure that fraying of twisted wire is within 110 mm (4.33 in).
L

PKIA0306E

q Do not make a bypass connection to repaired area. (If the circuit
is bypassed, characteristics of twisted wire will be lost.)

PKIA0307E

Revision: January 2005 BRC-5 2004 Titan
PRECAUTIONS
[ABS]
Wiring Diagrams and Trouble Diagnosis EFS003L8

When you read wiring diagrams, refer to the following:
q GI-14, "How to Read Wiring Diagrams".
q PG-4, "POWER SUPPLY ROUTING CIRCUIT".
When you perform trouble diagnosis, refer to the following:
q GI-11, "HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES".
q GI-27, "How to Perform Efficient Diagnosis for an Electrical Incident".

Revision: January 2005 BRC-6 2004 Titan
PREPARATION
[ABS]
PREPARATION PFP:00002
A
Special Service Tool EFS005SR

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number Description B
(Kent-Moore No.)
Tool name
(J-45741) Checking operation of ABS active wheel sen- C
ABS active wheel sensor tester sors

WFIA0101E
E
205-D002 Removing axle shaft bearing
( -- )
Bearing splitter
BRC

ZZA0700D G

Commercial Service Tools EFS005SS

Tool name Description H
1. Flare nut crowfoot Removing and installing brake piping
2. Torque wrench a: 10mm (0.39 in)/12mm (0.47 in)
I

J
S-NT360

Revision: January 2005 BRC-7 2004 Titan
SYSTEM DESCRIPTION
[ABS]
SYSTEM DESCRIPTION PFP:00000

System Components EFS003LB

WFIA0360E

ABS Function EFS003LC

q The Anti-Lock Brake System detects wheel revolution while braking and improves handling stability during
sudden braking by electrically preventing wheel lockup. Maneuverability is also improved for avoiding
obstacles.
q If the electrical system malfunctions, the Fail-Safe function is activated, the ABS becomes inoperative and
the ABS warning lamp turns on.
q The electrical system can be diagnosed using CONSULT-II.
q During ABS operation, the brake pedal may vibrate lightly and a mechanical noise may be heard. This is
normal.
q Just after starting the vehicle, the brake pedal may vibrate or a motor operating noise may be heard from
engine compartment. This is a normal status of operation check.
q Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel,
or snow-covered (fresh, deep snow) roads.
EBD Function EFS003LD

q Electronic Brake Distribution is a function that detects subtle slippages between the front and rear wheels
during braking, and it improves handling stability by electronically controlling the brake fluid pressure
which results in reduced rear wheel slippage.
q If the electrical system malfunctions, the Fail-Safe function is activated, the EBD and ABS become inoper-
ative, and the ABS warning lamp and BRAKE warning lamp are turned on.
q The electrical system can be diagnosed using CONSULT-II.
q During EBD operation, the brake pedal may vibrate lightly and a mechanical noise may be heard. This is
normal.
q Just after starting the vehicle, the brake pedal may vibrate or a motor operating noise may be heard from
engine compartment. This is a normal status of operation check.
Fail-Safe Function EFS003LG

CAUTION:
If the Fail-Safe function is activated, perform the Self Diagnosis for ABS system.
ABS/EBD SYSTEM
In case of an electrical malfunction with the ABS, the ABS warning lamp will turn on. In case of an electrical
malfunction with the EBD system, the BRAKE warning lamp and the ABS warning lamp will turn on.
The system will revert to one of the following conditions of the Fail-Safe function.

Revision: January 2005 BRC-8 2004 Titan
SYSTEM DESCRIPTION
[ABS]
1. For ABS malfunction, only the EBD is operative and the condition of the vehicle is the same condition of
vehicles without ABS system. A
2. For EBD malfunction, the EBD and ABS become inoperative, and the condition of the vehicle is the same
as the condition of vehicles without ABS or EBD system.
Hydraulic Circuit Diagram EFS003LH
B

BRC

J
WFIA0369E

1. Inlet solenoid valve 2. Outlet solenoid valve 3. Reservoir K
4. Pump 5. Motor 6. Inlet valve
7. Outlet valve 8. Bypass check valve 9. Damper
10. Pressure switch L

Revision: January 2005 BRC-9 2004 Titan
CAN COMMUNICATION
[ABS]
CAN COMMUNICATION PFP:23710

System Description EFS003LI

Refer to LAN-8, "CAN COMMUNICATION" .

Revision: January 2005 BRC-10 2004 Titan
TROUBLE DIAGNOSIS
[ABS]
TROUBLE DIAGNOSIS PFP:00000
A
How to Perform Trouble Diagnoses for Quick and Accurate Repair EFS003LJ

INTRODUCTION
The ABS system has an electronic control unit to control major func- B
tions. The control unit accepts input signals from sensors and con-
trols actuator operation. It is also important to check for conventional
problems such as air leaks in the booster or lines, lack of brake fluid,
or other problems with the brake system. C
It is much more difficult to diagnose a problem that occurs intermit-
tently rather than continuously. Most intermittent problems are
caused by poor electrical connections or faulty wiring. In this case, D
careful checking of suspicious circuits may help prevent the replace-
ment of good parts.
A visual check only may not find the cause of the problem, so a road
test should be performed.
SEF233G
E
Before undertaking actual checks, take just a few minutes to talk with
a customer who approaches with an ABS complaint. The customer
is a very good source of information on such problems, especially BRC
intermittent ones. Through the talks with the customer, find out what
symptoms are present and under what conditions they occur.
Start your diagnosis by looking for "conventional" problems first. This
is one of the best ways to troubleshoot brake problems on an ABS G
equipped vehicle. Also check related Service Bulletins for informa-
tion.
H
SEF234G

Revision: January 2005 BRC-11 2004 Titan
TROUBLE DIAGNOSIS
[ABS]
WORK FLOW

LFIA0197E

Revision: January 2005 BRC-12 2004 Titan
TROUBLE DIAGNOSIS
[ABS]
CLARIFY CONCERN
q A customer's description of a vehicle concern may vary depend- A
ing on the individual. It is important to clarify the customer's con-
cern.
q Ask the customer about what symptoms are present under what B
conditions. Use this information to reproduce the symptom while
driving.
q It is also important to use the diagnosis sheet to understand C
what type of trouble the customer is having.

SBR339B
D

EXAMPLE OF DIAGNOSIS SHEET
E

BRC

WFIA0226E

Revision: January 2005 BRC-13 2004 Titan
TROUBLE DIAGNOSIS
[ABS]
Component Parts and Harness Connector Location EFS003LK

WFIA0390E

Revision: January 2005 BRC-14 2004 Titan
TROUBLE DIAGNOSIS
[ABS]
Schematic EFS003LL

BRC

WFWA0260E

Revision: January 2005 BRC-15 2004 Titan
TROUBLE DIAGNOSIS
[ABS]
Wiring Diagram -- ABS -- EFS003LM

WFWA0104E

Revision: January 2005 BRC-16 2004 Titan
TROUBLE DIAGNOSIS
[ABS]

BRC

WFWA0105E

Revision: January 2005 BRC-17 2004 Titan
TROUBLE DIAGNOSIS
[ABS]

WFWA0261E

Revision: January 2005 BRC-18 2004 Titan
TROUBLE DIAGNOSIS
[ABS]

BRC

WFWA0077E

Revision: January 2005 BRC-19 2004 Titan
TROUBLE DIAGNOSIS
[ABS]
Basic Inspection EFS003LN

BRAKE FLUID LEVEL, FLUID LEAK, AND BRAKE PAD INSPECTION
1. Check fluid level in the brake fluid reservoir. If fluid level is low, add fluid.
2. Check the brake piping and around the ABS actuator and electric unit (control unit) for leaks. If there is
leaking or seeping fluid, check the following items.
q If ABS actuator and electric unit (control unit) connection is loose, tighten the piping to the specified
torque and recheck for leaks.
q If there is damage to the connection flare nut or ABS actuator and electric unit (control unit) threads,
replace the damaged part and recheck for leaks.
q When there is fluid leaking or seeping from a fluid connection, use a clean cloth to wipe off the fluid and
recheck for leaks. If fluid is still seeping out, replace the damaged part. If the fluid is leaking at the ABS
actuator and electric unit (control unit), replace the ABS actuator and electric unit (control unit) assem-
bly.
CAUTION:
The ABS actuator and electric unit (control unit) cannot be disassembled and must be replaced
as an assembly.
3. Check the brake pads for excessive wear.
POWER SYSTEM TERMINAL LOOSENESS AND BATTERY INSPECTION
Make sure the battery positive cable, negative cable and ground connection are not loose. In addition, make
sure the battery is sufficiently charged.
ABS WARNING LAMP INSPECTION
1. Make sure ABS warning lamp turns on for approximately 2 seconds when the ignition switch is turned ON.
If they do not, check CAN communications. If there are no errors with the CAN communication system,
check the combination meter. Refer to DI-5, "COMBINATION METERS" .
2. Make sure the lamp turn off approximately 2 seconds after the ignition switch is turned ON. If the lamp
does not turn off, conduct self-diagnosis.
3. Make sure ABS warning lamp turns off approximately 2 seconds after the engine is started. If ABS warn-
ing lamp has not turned off 10 seconds after the engine has been started, conduct self-diagnosis of the
ABS actuator and electric unit (control unit).
4. After conducting the self-diagnosis, be sure to erase the error memory. Refer to BRC-23, "CONSULT-II
Function (ABS)" .

Revision: January 2005 BRC-20 2004 Titan
TROUBLE DIAGNOSIS
[ABS]
Warning Lamp and Indicator Timing EFS003LO

A
ABS
Condition Remarks
warning lamp
When the ignition switch is OFF

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