2005 INFINITI QX4 brake sensor

BRC-52
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: October 20052005 QX56
2. CONNECTOR INSPECTION
1. Turn the ignition switch OFF.
2. Disconnect the front pressure sensor connector E31 and ABS actuator and electric unit (control unit) con-
nector E125 and inspect the terminals for deformation, disconnection, looseness, or damage.
OK or NG
OK >> GO TO 3.
NG >> Repair connector.
3. FRONT PRESSURE SENSOR CIRCUIT INSPECTION
1. Measure the continuity between the ABS actuator and electric unit (control unit) harness connector E125
and front pressure sensor harness connector E31.
2. Measure the continuity between the ABS actuator and electric unit (control unit) harness connector E125
and body ground.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace harness or connector.
4. FRONT PRESSURE SENSOR INSPECTION
1. Reconnect the front pressure sensor and ABS actuator and electric unit (control unit) connectors.
2. Use "DATA MONITOR" to check if the status of "PRESS SENSOR" is normal.
OK or NG
OK >> Inspection End.
NG >> Replace pressure sensor.ABS actuator and electric unit
(control unit) harness connector
E125Front pressure sensor har-
ness connector E31 Continuity
18 (LG) 3 (LG)
Ye s 19 (SB) 1 (SB)
20 (R/L) 2 (R/L)
ABS actuator and electric unit
(control unit) harness connector
E125Body ground Continuity
18 (LG)
—No 19 (SB)
20 (R/L)
ConditionData monitor display (Approx.)
PRESS SENSOR
When brake pedal is depressed Positive value
When brake pedal is released 0 bar

BRC-54
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: October 20052005 QX56
4. REAR PRESSURE SENSOR INSPECTION
1. Reconnect the rear pressure sensor and ABS actuator and electric unit (control unit) connectors.
2. Use "DATA MONITOR" to check if the status of "PRESS SEN 2" is normal.
OK or NG
OK >> Inspection End.
NG >> Replace rear pressure sensor.
Steering Angle Sensor Safe Mode InspectionEFS00695
INSPECTION PROCEDURE
1. INDICATOR LAMP CHECK
Check that VDC OFF indicator lamp is on.
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.
2. ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION
Adjust steering angle sensor neutral position. Refer to BRC-62, "
Adjustment of Steering Angle Sensor Neutral
Position" .
OK or NG
OK >> GO TO 3.
NG >> Check steering angle sensor. Refer to BRC-41, "
Steering Angle Sensor System" .
3. INDICATOR LAMP CHECK
Check that VDC OFF indicator lamp is off.
OK or NG
OK >> GO TO 4.
NG >> Perform basic inspection. Refer to BRC-23, "
Basic Inspection" .
4. CHECK SELF-DIAGNOSTIC RESULTS
Perform ABS actuator and electric unit (control unit) self-diagnosis.
NOTE:
When self-diagnostic results show items other than those above, perform repair or replacement for the item
indicated and repeat self-diagnosis.
Is the above displayed on self-diagnosis display?
YES >> Erase error memory.
NO >> Inspection End.ConditionData monitor display (Approx.)
PRESS SEN 2
When brake pedal is depressed Positive value
When brake pedal is released 0 bar
Self-diagnosis results
ST ANGL SEN SAFE

TROUBLE DIAGNOSES FOR SYMPTOMS
BRC-57
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC
Revision: October 20052005 QX56
TROUBLE DIAGNOSES FOR SYMPTOMSPFP:99999
ABS Works FrequentlyEFS004Y9
1. CHECK WARNING LAMP ACTIVATION
Make sure warning lamp remains off while driving.
OK or NG
OK >> GO TO 2.
NG >> Carry out self-diagnosis. Refer to BRC-29, "
SELF-DIAGNOSIS" .
2. CHECK WHEEL SENSORS
Check the following.

Wheel sensor mounting for looseness

Wheel sensors for physical damage

Wheel sensor connectors for terminal damage or loose connections
OK or NG
OK >> GO TO 3.
NG >> Repair or replace as necessary.
3. CHECK FRONT AND REAR AXLES
Check front and rear axles for excessive looseness. Refer to FAX-5, "
WHEEL HUB" or RAX-5, "WHEEL
HUB" .
OK or NG
OK >> GO TO 4.
NG >> Repair as necessary.
4. CHECK BRAKE FLUID PRESSURE
Check brake fluid pressure distribution.
Refer to BRC-23, "
Basic Inspection" .
Is brake fluid pressure distribution normal?
YES >> Inspection End.
NO >> Perform Basic Inspection. Refer to BRC-23, "
Basic Inspection" .

BRC-58
[VDC/TCS/ABS]
TROUBLE DIAGNOSES FOR SYMPTOMS
Revision: October 20052005 QX56
Unexpected Pedal ActionEF S0 04 YA
1. CHECK WARNING LAMP ACTIVATION
Make sure warning lamp remains off while driving.
OK or NG
OK >> GO TO 2.
NG >> Carry out self-diagnosis. Refer to BRC-29, "
SELF-DIAGNOSIS" .
2. CHECK BRAKE PEDAL STROKE
Check brake pedal stroke.
Is pedal stroke excessive?
YES >> Perform Basic Inspection. Refer to BRC-23, "Basic
Inspection" .
NO >> GO TO 3.
3. CHECK CONNECTOR AND BRAKING PERFORMANCE
1. Disable ABS by disconnecting ABS actuator and electric unit (control unit) connector.
2. Drive vehicle and check brake operation.
NOTE:

Stopping distance may be longer than vehicles without ABS when road condition is slippery.

Driving the vehicle with the ABS actuator and electric unit (control unit) disconnected may induce DTCs
in electrical control units using CAN communication. After the inspection, clear all DTCs. Refer to BRC-
10, "CAN COMMUNICATION" .
OK or NG
OK >> GO TO 4.
NG >> Perform Basic Inspection. Refer to BRC-23, "
Basic Inspection" .
4. CHECK WHEEL SENSORS
Check the following.

Wheel sensor mounting for looseness

Wheel sensors for physical damage

Wheel sensor connectors for terminal damage or loose connections
OK or NG
OK >> Check ABS actuator and electric unit (control unit) connector terminals for deformation, discon-
nection, looseness or damage. Reconnect ABS actuator and electric unit (control unit) harness
connector. Then retest.
NG >> Repair or replace as necessary.
SBR5 40 A

BRC-64
[VDC/TCS/ABS]
WHEEL SENSORS
Revision: October 20052005 QX56
WHEEL SENSORSPFP:47910
Removal and InstallationEFS004YJ
REMOVAL
1. Remove wheel sensor mounting screw.

When removing the front wheel sensor, first remove the disc rotor to gain access to the front wheel sen-
sor mounting bolt. Refer to BR-21, "
Removal and Installation of Brake Caliper Assembly and Disc
Rotor" .

When removing the rear wheel sensor, first remove the rear hub and bearing assembly to gain access
to the rear wheel sensor mounting bolt. Refer to RAX-5, "
Removal and Installation" .
2. Pull out the sensor, being careful to turn it as little as possible.
CAUTION:

Do not pull on the sensor harness.
3. Disconnect wheel sensor harness electrical connector, then remove harness from mounts.
INSTALLATION
Installation is in the reverse order of removal. Tighten wheel sensor bolt to the specified torque.
CAUTION:
Installation should be performed while paying attention to the following.

Inspect wheel sensor O-ring, replace sensor assembly if damaged.

Before installing wheel sensor, make sure no foreign materials (such as iron fragments) are
adhered to the pick-up part of the sensor, to the inside of the sensor mounting hole or on the rotor
mounting surface.

Apply a coat of suitable grease to the wheel sensor O-ring and mounting hole.
WFIA0376E

ACTUATOR AND ELECTRIC UNIT (ASSEMBLY)
BRC-67
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC
Revision: October 20052005 QX56
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
To install, use a flare nut wrench (commercial service tool).

Always tighten brake tubes to specification when installing. Refer to BR-11, "BRAKE PIPING AND
HOSE" .

Never reuse drained brake fluid.

After installation of the ABS actuator and electric unit (control unit), perform the following.
–Refill brake system with new brake fluid. Then bleed the air from the system. Refer to BR-10,
"Bleeding Brake System" .
–Adjust the steering angle sensor. Refer to BRC-62, "Adjustment of Steering Angle Sensor Neutral
Position" .
–Calibrate the decel G sensor. Refer to BRC-62, "Calibration of Decel G Sensor" .

DI-64
REAR SONAR SYSTEM
Revision: October 20052005 QX56
Pre-diagnosis InspectionEKS00BD7
SENSOR STATUS CHECK

Check that the rear sonar sensor is properly aligned (bumper is not misaligned, no deformation in sensor
mounting area.

Check that snow, mud, or other foreign objects are not adhering to the rear sonar sensor.

Check that there is no deformation, scratches, or other damage to the rear sonar sensor.

Check that water has not accumulated in the rear sonar sensor.
CAUTION:
Use water, cotton swab, or other soft material for cleaning the sensor.
1. Check that there are no obstacles within each rear sonar sensor's detection range.
2. Check that there are no nearby ultrasound sources (such as the sounds of vehicle horns, motorcycle
engines, or truck air brakes).
3. Check that the vehicle is on a level surface.
Self-diagnosis FunctionEKS00BD8
There are four modes of self-diagnosis; entering diagnostics, requesting number of fault codes, requesting
fault codes, and idling or clearing fault codes. These steps must be followed in order. Self-diagnosis can be
manually exited by turning the ignition switch OFF, or selecting reverse gear. Self-diagnosis will exit unless a
fault code request occurs before a message is repeated five times without acknowledgement.
ENTERING DIAGNOSTICS MODE
1. Turn ignition switch ON. Rear sonar system OFF switch indica-
tor lamp illuminates for three seconds and then turns off.
2. Immediately push rear sonar system OFF switch ten times
within five seconds.
3. The sonar buzzer will sound once and the rear sonar system
OFF indicator will flash once.
REQUESTING NUMBER OF FAULT CODES MODE
1. While in diagnostic mode, push rear sonar system OFF switch
once.
2. The sonar buzzer will sound once.
3. Rear sonar system OFF indicator will flash once and sonar
buzzer will sound once for each fault code detected.
4. There will be a four second pause.
5. The number of fault codes will repeat five times then pause.
NOTE:
Self-diagnosis will exit unless requesting fault codes occurs
before five repeats ends.
Detection range
Rear sonar sensors Approx. 1.8 m (5.9 ft.) maximum
LKIA0389E
LKIA0388E

EC-6Revision: October 20052005 QX56 DTC P1279, P1289 A/F SENSOR 1 ........................519
Component Description ........................................519
CONSULT-II Reference Value in Data Monitor Mode
.519
On Board Diagnosis Logic ....................................519
DTC Confirmation Procedure ...............................520
Wiring Diagram .....................................................522
Diagnostic Procedure ...........................................525
Removal and Installation ......................................530
DTC P1444 EVAP CANISTER PURGE VOLUME
CONTROL SOLENOID VALVE ...............................531
Description ............................................................531
CONSULT-II Reference Value in Data Monitor Mode
.531
On Board Diagnosis Logic ....................................532
DTC Confirmation Procedure ...............................532
Wiring Diagram .....................................................533
Diagnostic Procedure ...........................................535
Component Inspection ..........................................538
Removal and Installation ......................................538
DTC P1446 EVAP CANISTER VENT CONTROL
VALVE .....................................................................539
Component Description ........................................539
CONSULT-II Reference Value in Data Monitor Mode
.539
On Board Diagnosis Logic ....................................539
DTC Confirmation Procedure ...............................540
Wiring Diagram .....................................................541
Diagnostic Procedure ...........................................542
Component Inspection ..........................................543
DTC P1564 ICC STEERING SWITCH ....................545
Component Description ........................................545
CONSULT-II Reference Value in Data Monitor Mode
.545
On Board Diagnosis Logic ....................................545
DTC Confirmation Procedure ...............................546
Wiring Diagram .....................................................547
Diagnostic Procedure ...........................................548
Component Inspection ..........................................551
DTC P1564 ASCD STEERING SWITCH ................552
Component Description ........................................552
CONSULT-II Reference Value in Data Monitor Mode
.552
On Board Diagnosis Logic ....................................552
DTC Confirmation Procedure ...............................553
Wiring Diagram .....................................................554
Diagnostic Procedure ...........................................555
Component Inspection ..........................................558
DTC P1568 ICC FUNCTION ...................................559
On Board Diagnosis Logic ....................................559
DTC Confirmation Procedure ...............................559
Diagnostic Procedure ...........................................559
DTC P1572 ICC BRAKE SWITCH ..........................560
Component Description ........................................560
CONSULT-II Reference Value in Data Monitor Mode
.560
On Board Diagnosis Logic ....................................560
DTC Confirmation Procedure ...............................561
Wiring Diagram .....................................................562Diagnostic Procedure ............................................ 563
Component Inspection .......................................... 567
DTC P1572 ASCD BRAKE SWITCH ...................... 569
Component Description ........................................ 569
CONSULT-II Reference Value in Data Monitor Mode
. 569
On Board Diagnosis Logic .................................... 569
DTC confirmation Procedure ................................ 570
Wiring Diagram ..................................................... 571
Diagnostic Procedure ............................................ 572
Component Inspection .......................................... 576
DTC P1574 ICC VEHICLE SPEED SENSOR ......... 577
Component Description ........................................ 577
On Board Diagnosis Logic .................................... 577
DTC Confirmation Procedure ................................ 577
Diagnostic Procedure ............................................ 578
DTC P1574 ASCD VEHICLE SPEED SENSOR ..... 579
Component Description ........................................ 579
On Board Diagnosis Logic .................................... 579
DTC Confirmation Procedure ................................ 579
Diagnostic Procedure ............................................ 580
DTC P1706 PNP SWITCH ....................................... 581
Component Description ........................................ 581
CONSULT-II Reference Value in Data Monitor Mode
. 581
On Board Diagnosis Logic .................................... 581
DTC Confirmation Procedure ................................ 581
Overall Function Check ......................................... 582
Wiring Diagram ..................................................... 583
Diagnostic Procedure ............................................ 584
DTC P1805 BRAKE SWITCH ................................. 586
Description ............................................................ 586
CONSULT-II Reference Value in Data Monitor Mode
. 586
On Board Diagnosis Logic .................................... 586
DTC Confirmation Procedure ................................ 586
Wiring Diagram ..................................................... 587
Diagnostic Procedure ............................................ 588
Component Inspection .......................................... 590
DTC P2122, P2123 APP SENSOR ......................... 591
Component Description ........................................ 591
CONSULT-II Reference Value in Data Monitor Mode
. 591
On Board Diagnosis Logic .................................... 591
DTC Confirmation Procedure ................................ 592
Wiring Diagram ..................................................... 593
Diagnostic Procedure ............................................ 594
Component Inspection .......................................... 596
Removal and Installation ....................................... 596
DTC P2127, P2128 APP SENSOR ......................... 597
Component Description ........................................ 597
CONSULT-II Reference Value in Data Monitor Mode
. 597
On Board Diagnosis Logic .................................... 597
DTC Confirmation Procedure ................................ 598
Wiring Diagram ..................................................... 599
Diagnostic Procedure ............................................ 600
Component Inspection .......................................... 603
Removal and Installation ....................................... 603