battery INFINITI QX56 2006 Factory Service Manual
[x] Cancel search | Manufacturer: INFINITI, Model Year: 2006, Model line: QX56, Model: INFINITI QX56 2006Pages: 3383, PDF Size: 51.76 MB
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BRC-1
BRAKE CONTROL SYSTEM
F BRAKES
CONTENTS
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BRC
Revision: November 2009 2006 QX56VDC/TCS/ABS
PRECAUTIONS .......................................................... 3
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ............................................................. ..... 3
Precautions for Brake System ............................. ..... 3
Precautions When Using CONSULT-II ................ ..... 3
CHECK POINTS FOR USING CONSULT-II .... ..... 3
Precautions for Brake Control ............................. ..... 4
Precautions for CAN System .............................. ..... 4
PREPARATION ...................................................... ..... 6
Special Service Tool ............................................ ..... 6
Commercial Service Tools ................................... ..... 6
SYSTEM DESCRIPTION ............................................ 7 System Components ........................................... ..... 7
ABS Function ........................................................... 8
EBD Function ...................................................... ..... 8
TCS Function ...................................................... ..... 8
VDC Function ...................................................... ..... 8
Fail-Safe Function .................................................... 8 ABS/EBD SYSTEM .......................................... ..... 9
VDC/TCS SYSTEM .......................................... ..... 9
ACTIVE BOOSTER .......................................... ..... 9
Hydraulic Circuit Diagram ................................... ..... 9
CAN COMMUNICATION ....................................... ... 10
System Description ............................................. ... 10
TROUBLE DIAGNOSIS ......................................... ....11
How to Perform Trouble Diagnoses for Quick and
Accurate Repair .................................................. .... 11
INTRODUCTION .............................................. .... 11
WORK FLOW ................................................... ... 12
CLARIFY CONCERN ....................................... ... 13
EXAMPLE OF DIAGNOSIS SHEET ................ ... 13
Component Parts and Harness Connector Location ... 14
Schematic ........................................................... ... 15
Wiring Diagram — VDC — .................................. ... 16
Basic Inspection .................................................. ... 23
BRAKE FLUID LEVEL, FLUID LEAK, AND
BRAKE PAD INSPECTION .............................. ... 23
POWER SYSTEM TERMINAL LOOSENESS AND BATTERY INSPECTION ..........................
... 23
ABS WARNING LAMP, SLIP INDICATOR LAMP
AND VDC OFF INDICATOR LAMP INSPECTION ... 23
Warning Lamp and Indicator Timing .................... ... 24
Control Unit Input/Output Signal Standard .......... ... 24
REFERENCE VALUE FROM CONSULT-II ...... ... 24
CONSULT-II Function (ABS) ............................... ... 28
CONSULT-II BASIC OPERATION PROCEDURE ... 28
SELF-DIAGNOSIS ........................................... ... 29
DATA MONITOR .............................................. ... 32
ACTIVE TEST ..................................................... 35
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC
ITEMS ..................................................................... ... 38
Wheel Sensor System Inspection ........................ ... 38
Engine System Inspection ................................... ... 39
ABS/TCS/VDC Control Unit Inspection ............... ... 40
Steering Angle Sensor System ............................ ... 40
Yaw Rate/Side/Decel G Sensor System Inspection ... 41
Solenoid and VDC Change-Over Valve System
Inspection ............................................................ ... 43
Actuator Motor, Motor Relay, and Circuit Inspection ... 44
Stop Lamp Switch System Inspection ................. ... 45
ABS/TCS/VDC Control Unit Power and Ground
Systems Inspection ............................................. ... 46
Brake Fluid Level Switch System Inspection ....... ... 47
Active Booster System Inspection ....................... ... 48
Delta Stroke Sensor System Inspection .............. ... 49
Pressure Sensor System Inspection ................... ... 51
Steering Angle Sensor Safe Mode Inspection ..... ... 53
CAN Communication System Inspection ............. ... 54
ICC System Inspection ........................................ ... 54
Inspection For Self-diagnosis Result "ST ANG SEN
SIGNAL" .............................................................. ... 55
Inspection For Self-diagnosis Result "DECEL G
SEN SET" ............................................................ ... 55
VDC OFF Indicator lamp Does Not Illuminate ..... ... 56
Component Inspection ......................................... ... 56
VDC OFF SWITCH .......................................... ... 56
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![INFINITI QX56 2006 Factory Service Manual BRC-4
[VDC/TCS/ABS]
PRECAUTIONS
Revision: November 20092006 QX56
If NO, GO TO 5.
2. Is there any indication other than indications relating to CAN communication system in the self-diagnosis results?](/img/42/57028/w960_57028-1030.png "INFINITI QX56 2006 Factory Service Manual BRC-4
[VDC/TCS/ABS]
PRECAUTIONS
Revision: November 20092006 QX56
If NO, GO TO 5.
2. Is there any indication other than indications relating to CAN communication system in the self-diagnosis results?")
BRC-4
[VDC/TCS/ABS]
PRECAUTIONS
Revision: November 20092006 QX56
If NO, GO TO 5.
2. Is there any indication other than indications relating to CAN communication system in the self-diagnosis results?
If YES, GO TO 3.
If NO, GO TO 4.
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.
5. Diagnose CAN communication system. Refer to BRC-10, "
CAN COMMUNICATION" .
Precautions for Brake ControlEFS004X6
During ABS operation, the brake pedal may vibrate lightly and a mechanical noise may be heard. This is
normal.
Just after starting 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.
Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel,
or snow-covered (fresh, deep snow) roads.
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 booster operation, brake fluid level, and fluid leaks.
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.
If there is a radio, antenna or related wiring near control module, ABS function may have a malfunction or
error.
If aftermarket parts (car stereo, CD player, etc.) have been installed, check for incidents such as harness
pinches, open circuits or improper wiring.
If the following components are replaced with non-genuine components or modified, the VDC OFF indica-
tor lamp and SLIP indicator lamp may turn on or the VDC system may not operate properly. Components
related to suspension (shock absorbers, struts, springs, bushings, etc.), tires, wheels (exclude specified
size), components related to brake system (pads, rotors, calipers, etc.), components related to engine
(muffler, ECM, etc.), components related to body reinforcement (roll bar, tower bar, etc.).
Driving with broken or excessively worn suspension components, tires or brake system components may
cause the VDC OFF indicator lamp and the SLIP indicator lamp to turn on, and the VDC system may not
operate properly.
When the TCS or VDC is activated by sudden acceleration or sudden turn, some noise may occur. The
noise is a result of the normal operation of the TCS and VDC.
When driving on roads which have extreme slopes (such as mountainous roads) or high banks (such as
sharp curves on a freeway), the VDC may not operate normally, or the VDC warning lamp and the SLIP
indicator lamp may turn on. This is not a problem if normal operation can be resumed after restarting the
engine.
Sudden turns (such as spin turns, acceleration turns), drifting, etc. with VDC turned off may cause the yaw
rate/side G sensor to indicate a problem. This is not a problem if normal operation can be resumed after
restarting the engine.
Precautions for CAN SystemEFS004X7
Do not apply voltage of 7.0V or higher to terminal to be measured.
Maximum open terminal voltage of tester in use must be less than 7.0V.
Before checking harnesses, turn ignition switch OFF and disconnect battery negative cable.
Page 1050 of 3383
![INFINITI QX56 2006 Factory Service Manual TROUBLE DIAGNOSISBRC-23
[VDC/TCS/ABS]
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Basic InspectionEFS004XN
BRAKE FLUID LEVEL, FLUID LEAK, AND BRAKE PAD INSPECTION
1. Check fluid level](/img/42/57028/w960_57028-1049.png "INFINITI QX56 2006 Factory Service Manual TROUBLE DIAGNOSISBRC-23
[VDC/TCS/ABS]
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Basic InspectionEFS004XN
BRAKE FLUID LEVEL, FLUID LEAK, AND BRAKE PAD INSPECTION
1. Check fluid level")
TROUBLE DIAGNOSISBRC-23
[VDC/TCS/ABS]
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Basic InspectionEFS004XN
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.
If ABS actuator and electric unit (control unit) connection is loose, tighten the piping to the specified
torque and recheck for leaks.
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.
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, SLIP INDICATOR LAMP AND VDC OFF INDICATOR LAMP INSPECTION
1. Make sure ABS warning lamp, SLIP indicator lamp and VDC OFF indicator lamp (when VDC OFF switch is off), turn on for approximately 2 seconds when the ignition switch is turned ON. If they do not, check the
VDC OFF indicator lamp and the VDC OFF switch. Refer to BRC-56, "
VDC OFF SWITCH" . Check CAN
communications. If there are no errors with the VDC OFF switch or CAN communication system, check
combination meter. Refer to DI-5, "
COMBINATION METERS" .
2. Make sure the lamps turn off approximately 2 seconds after the ignition switch is turned ON. If the lamp does not turn off, conduct self-diagnosis.
3. With the engine running, make sure the VDC OFF indicator lamp turns on and off when the VDC OFF switch is turned on and off. If the indicator lamp status does not correspond to switch operation, check the
VDC OFF switch. Refer to BRC-56, "
VDC OFF SWITCH" .
4. Make sure ABS warning lamp, SLIP indicator lamp and VDC OFF indicator lamp turn off approximately 2 seconds after the engine is started. If ABS warning lamp, SLIP indicator lamp or VDC OFF indicator lamp
have not turned off 10 seconds after the engine has been started, conduct self-diagnosis of the ABS actu-
ator and electric unit (control unit).
5. After conducting the self-diagnosis, be sure to erase the error memory. Refer to BRC-28, "
CONSULT-II
Function (ABS)" .
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![INFINITI QX56 2006 Factory Service Manual TROUBLE DIAGNOSISBRC-25
[VDC/TCS/ABS]
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STR ANGLE SIGSteering angle
detected by steering
angle sensorStraight-ahead
Approx. 0 deg
BRC-40, "](/img/42/57028/w960_57028-1051.png "INFINITI QX56 2006 Factory Service Manual TROUBLE DIAGNOSISBRC-25
[VDC/TCS/ABS]
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STR ANGLE SIGSteering angle
detected by steering
angle sensorStraight-ahead
Approx. 0 deg
BRC-40, \"")
TROUBLE DIAGNOSISBRC-25
[VDC/TCS/ABS]
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STR ANGLE SIGSteering angle
detected by steering
angle sensorStraight-ahead
Approx. 0 deg
BRC-40, "Steering Angle
Sensor System"Steering wheel turned –756 to 756 deg
YAW RATE SEN Yaw rate detected by
yaw rate sensorVehicle stopped Approx. 0 d/s
BRC-41, "
Yaw Rate/Side/
Decel G Sensor System
Inspection"Vehicle running–100 to 100 d/s
SIDE G-SENSOR Transverse G detected
by side G-sensorVehicle stopped
Approx. 0 m/s
2BRC-41, "Yaw Rate/Side/
Decel G Sensor System
Inspection"Vehicle running–16.7 to 16.7 m/s2
BATTERY VOLT Battery voltage sup-
plied to ABS actuator
and electric unit (con-
trol unit)Ignition switch ON
10 to 16VBRC-46, "
ABS/TCS/VDC
Control Unit Power and
Ground Systems Inspec-
tion"
STOP LAMP SW
Stop lamp switch oper-
ationBrake pedal depressed ON
BRC-45, "
Stop Lamp
Switch System Inspec-
tion"Brake pedal not depressed OFF
OFF SW VDC OFF switch
ON/OFF status VDC OFF switch ON
(When VDC OFF indicator
lamp is ON)
ON
BRC-56, "
VDC OFF
SWITCH"VDC OFF switch OFF
(When VDC OFF indicator
lamp is OFF) OFF
ABS WARN LAMP ABS warning lamp ON
condition (Note 2)ABS warning lamp ON ON
—
ABS warning lamp OFF OFF
MOTOR RELAY Operation status of
motor and motor relayIgnition switch ON or running
(ABS not activated)
OFF
BRC-44, "
Actuator Motor,
Motor Relay, and Circuit
Inspection"Ignition switch ON or engine
running (ABS activated) ON
ACTUATOR RLY Actuator relay opera-
tion statusVehicle stopped (Ignition
switch ON)
OFF
BRC-44, "
Actuator Motor,
Motor Relay, and Circuit
Inspection"Vehicle stopped (Engine run-
ning) ON
OFF LAMP VDC OFF indicator
lamp status (Note 3) When VDC OFF indicator
lamp is ON
ON
BRC-54, "
CAN Commu-
nication System Inspec-
tion"When VDC OFF indicator
lamp is OFF OFF
SLIP LAMP SLIP indicator lamp
status (Note 4)When SLIP indicator lamp is
ON
ON
BRC-54, "
CAN Commu-
nication System Inspec-
tion"When SLIP indicator lamp is
OFF OFF
Monitor item
Display content Data monitor
Note: Error inspection
checklist
Condition Reference value in
normal operation
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Revision: November 2009 2006 QX56
FR LH IN ABS SOL
[C1120]Circuit of front LH IN ABS solenoid is open or shorted, or control
line is o](/img/42/57028/w960_57028-1057.png "INFINITI QX56 2006 Factory Service Manual TROUBLE DIAGNOSISBRC-31
[VDC/TCS/ABS]
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FR LH IN ABS SOL
[C1120]Circuit of front LH IN ABS solenoid is open or shorted, or control
line is o")
TROUBLE DIAGNOSISBRC-31
[VDC/TCS/ABS]
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FR LH IN ABS SOL
[C1120]Circuit of front LH IN ABS solenoid is open or shorted, or control
line is open or shorted to power supply or ground.
BRC-43, "
Solenoid and
VDC Change-Over Valve
System Inspection"
FR LH OUT ABS SOL
[C1121]Circuit of front LH OUT ABS solenoid is open or shorted, or con-
trol line is open or shorted to power supply or ground.
RR RH IN ABS SOL
[C1126] Circuit of rear RH IN ABS solenoid is open or shorted, or control
line is open or shorted to power supply or ground.
RR RH OUT ABS SOL
[C1127] Circuit of rear RH OUT ABS solenoid is open or shorted, or con-
trol line is open or shorted to power supply or ground.
FR RH IN ABS SOL
[C1122] Circuit of front RH IN ABS solenoid is open or shorted, or control
line is open or shorted to power supply or ground.
FR RH OUT ABS SOL
[C1123] Circuit of front RH OUT ABS solenoid is open or shorted, or con-
trol line is open or shorted to power supply or ground.
RR LH IN ABS SOL
[C1124] Circuit of rear LH IN ABS solenoid is open or shorted, or control
line is open or shorted to power supply or ground.
RR LH OUT ABS SOL
[C1125] Circuit of rear LH OUT ABS solenoid is open or shorted, or con-
trol line is open or shorted to power supply or ground.
CV1
[C1164] Front side VDC switch-over solenoid valve (cut valve) is open or
shorted, or control line is open or shorted to power supply or
ground.
CV2
[C1165] Rear side VDC switch-over solenoid valve (cut valve) is open or
shorted, or control line is open or shorted to power supply or
ground.
SV1
[C1166] Front side VDC switch-over solenoid valve (suction valve) is
open or shorted, or control line is open or shorted to power sup-
ply or ground.
SV2
[C1167] Rear side VDC switch-over solenoid valve (suction valve) is open
or shorted, or control line is open or shorted to power supply or
ground.
PUMP MOTOR
[ C 1111 ] During actuator motor operation with ON, when actuator motor
turns OFF or when control line for actuator motor relay is open.
BRC-44, "
Actuator
Motor, Motor Relay, and
Circuit Inspection"During actuator motor operation with OFF, when actuator motor
turns ON or when control line for relay is shorted to ground.
BATTERY VOLTAGE
[ABNORMAL]
[C1109] ABS actuator and electric unit (control unit) power voltage is too
low. BRC-46, "
ABS/TCS/
VDC Control Unit Power
and Ground Systems
Inspection"
ST ANG SEN SIGNAL
[C1144]
Neutral position correction of steering angle sensor is not fin-
ished. BRC-55, "Inspection For
Self-diagnosis Result
"ST ANG SEN SIGNAL""
ST ANG SEN COM CIR
[C1156]
CAN communication line or steering angle sensor has generated
an error. BRC-40, "Steering Angle
Sensor System"
G-SENSOR
[C1113]Longitudinal G-sensor is malfunctioning, or signal line of longitu-
dinal G-sensor is open or shorted. BRC-41, "Yaw Rate/
Side/Decel G Sensor
System Inspection"
CONTROLLER FAILURE
[C1110]
Internal malfunction of ABS actuator and electric unit (control
unit) BRC-40, "ABS/TCS/
VDC Control Unit
Inspection"
CAN COMM CIRCUIT
[U1000]
CAN communication line is open or shorted.
ABS actuator and electric unit (control unit) internal malfunc-
tion
Battery voltage for ECM is suddenly interrupted for approxi-
mately 0.5 second or more.BRC-54, "
CAN Commu-
nication System Inspec-
tion" (Note 2)
SIDE G-SEN CIRCUIT
[C1146] Lateral G-sensor is malfunctioning, or signal line of lateral G-sen-
sor is open or shorted. BRC-41, "
Yaw Rate/
Side/Decel G Sensor
System Inspection"
Self-diagnostic item
Malfunction detecting condition Check system
Page 1060 of 3383
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[VDC/TCS/ABS]
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Revision: November 2009 2006 QX56
CAUTION:
When “START (NISSAN BASED VHCL)” is touched immediately after starting the engine or tur](/img/42/57028/w960_57028-1059.png "INFINITI QX56 2006 Factory Service Manual TROUBLE DIAGNOSISBRC-33
[VDC/TCS/ABS]
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Revision: November 2009 2006 QX56
CAUTION:
When “START (NISSAN BASED VHCL)” is touched immediately after starting the engine or tur")
TROUBLE DIAGNOSISBRC-33
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CAUTION:
When “START (NISSAN BASED VHCL)” is touched immediately after starting the engine or turning
on the ignition switch, “ABS” might not be displayed in the SELECT SYSTEM screen. In this case,
repeat the operation from step 2.
3. Return to the SELECT MONITOR ITEM screen, and touch “ECU INPUT SIGNALS”, “MAIN SIGNALS ”, or
“SELECTION FROM MENU ”. Refer to the following information.
4. When “START” is touched, the data monitor screen is displayed.
Display Item List
Item
(Unit) Data monitor item selection
Remarks
ECU INPUT
SIGNALS MAIN
SIGNALS SELECTION
FROM MENU
GEAR ××× Gear position judged by PNP
switch signal is displayed.
FR RH SENSOR
(km/h, MPH) ××× Wheel speed calculated by front
RH wheel sensor signal is dis-
played.
FR LH SENSOR
(km/h, MPH) ××× Wheel speed calculated by front LH
wheel sensor signal is displayed.
RR RH SENSOR
(km/h, MPH) ××× Wheel speed calculated by rear RH
wheel sensor signal is displayed.
RR LH SENSOR
(km/h, MPH) ×××
Wheel speed calculated by rear LH
wheel sensor signal is displayed.
BATTERY VOLT
(V) ××× Voltage supplied to ABS actuator
and electric unit (control unit) is dis-
played.
N POSI SIG ––× Shift position judged by PNP switch
signal.
P POSI SIG ––× Shift position judged by PNP switch
signal.
ACCEL POS SIG
(%) ×
–×Throttle valve open/close status
judged by CAN communication sig-
nal is displayed.
ENGINE SPEED
(rpm) ××× Engine speed judged by CAN com-
munication signal is displayed.
STR ANGLE SIG
(deg) ×
–×Steering angle detected by steering
angle sensor is displayed.
YAW R AT E S E N
(d/s) ×××
Yaw rate detected by yaw rate sen-
sor is displayed.
DECEL G-SEN
(d/s) ××× Longitudinal acceleration detected
by decel G-sensor is displayed.
SIDE G-SENSOR
(m/s
2 ) ×
– × Transverse acceleration detected
by side G-sensor is displayed.
STOP LAMP SW
(ON/OFF) ××× Stop lamp switch (ON/OFF) status
is displayed.
OFF SW
(ON/OFF)
×× × VDC OFF switch (ON/OFF) status
is displayed.
ABS WARN LAMP
(ON/OFF) –
×× ABS warning lamp (ON/OFF) status
is displayed.
SLIP LAMP
(ON/OFF) –
×× SLIP indicator lamp (ON/OFF) sta-
tus is displayed.
FR LH IN SOL
(ON/OFF) –
×× Front LH IN ABS solenoid (ON/
OFF) status is displayed.
FR LH OUT SOL
(ON/OFF) –
×× Front LH OUT ABS solenoid (ON/
OFF) status is displayed.
Page 1065 of 3383
![INFINITI QX56 2006 Factory Service Manual BRC-38
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: November 20092006 QX56
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMSPFP:00000
Wheel Sensor System InspectionEFS004XR
INSPECTION](/img/42/57028/w960_57028-1064.png "INFINITI QX56 2006 Factory Service Manual BRC-38
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: November 20092006 QX56
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMSPFP:00000
Wheel Sensor System InspectionEFS004XR
INSPECTION")
BRC-38
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: November 20092006 QX56
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMSPFP:00000
Wheel Sensor System InspectionEFS004XR
INSPECTION PROCEDURE
1. CONNECTOR INSPECTION
Disconnect the ABS actuator and electric unit (control unit) connector E125 and wheel sensor of malfunction-
ing code.
Check the terminals for deformation, disconnection, looseness or damage.
OK or NG
OK >> GO TO 2.
NG >> Repair or replace as necessary.
2. CHECK WHEEL SENSOR OUTPUT SIGNAL
1. Connect ABS active wheel sensor tester (J-45741) to wheel sensor using appropriate adapter.
2. Turn on the ABS active wheel sensor tester power switch. NOTE:
The green POWER indicator should illuminate. If the POWER indicator does not illuminate, replace the
battery in the ABS active wheel sensor tester before proceeding.
3. Spin the wheel of the vehicle by hand and observe the red SENSOR indicator on the ABS active wheel sensor tester. The red SENSOR indicator should flash on and off to indicate an output signal.
NOTE:
If the red SENSOR indicator illuminates but does not flash, reverse the polarity of the tester leads and
retest.
Does the ABS active wheel sensor tester detect a signal?
YES >> GO TO 3.
NO >> Replace the wheel sensor. Refer to BRC-64, "
Removal and Installation" .
3. CHECK TIRES
Check for inflation pressure, wear and size of each tire.
Are tire pressure and size correct and is tire wear within specifications?
YES >> GO TO 4.
NO >> Adjust tire pressure or replace tire(s).
4. CHECK WHEEL BEARINGS
Check wheel bearing axial end play. Refer to FA X - 5 , "
WHEEL BEARING INSPECTION" or RAX-5, "WHEEL
BEARING INSPECTION" .
OK or NG
OK >> GO TO 5.
NG >> Repair or replace as necessary. Refer to FAX-5, "
WHEEL BEARING INSPECTION" or RAX-5,
"WHEEL BEARING INSPECTION" .
5. CHECK WIRING HARNESS FOR SHORT CIRCUIT
1. Disconnect ABS actuator and electric unit (control unit) connec- tor and wheel sensor connector of malfunction code No.
2. Check continuity between wheel sensor harness connector ter- minals and ground.
OK or NG
OK >> GO TO 6.
NG >> Repair the circuit. Continuity should not exist.
WFIA0343E
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![INFINITI QX56 2006 Factory Service Manual BRC-46
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: November 20092006 QX56
3. STOP LAMP SWITCH INSPECTION
Check the voltage between the ABS actuator and electric unit (con-
trol](/img/42/57028/w960_57028-1072.png "INFINITI QX56 2006 Factory Service Manual BRC-46
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: November 20092006 QX56
3. STOP LAMP SWITCH INSPECTION
Check the voltage between the ABS actuator and electric unit (con-
trol")
BRC-46
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: November 20092006 QX56
3. STOP LAMP SWITCH INSPECTION
Check the voltage between the ABS actuator and electric unit (con-
trol unit) harness connector E125 terminal 41 and body ground.
OK or NG
OK >> Perform self-diagnosis again. If the same results appear, replace ABS actuator and electric unit (control
unit). Refer to BRC-66, "
Removal and Installation" .
NG >> GO TO 4.
4. STOP LAMP RELAY CIRCUIT INSPECTION
1. Disconnect the stop lamp relay harness connector E12.
2. Check the continuity between the ABS actuator and electric unit (control unit) harness connector E125 (B) terminal 41 and stop
lamp relay harness connector E12 (A) terminal 4.
OK or NG
OK >> Perform self-diagnosis again. If the same results appear, replace ABS actuator and electric unit (control
unit). Refer to BRC-66, "
Removal and Installation" .
NG >> Refer to LT- 1 0 6 , "
STOP LAMP" .
ABS/TCS/VDC Control Unit Power and Ground Systems InspectionEFS004XZ
INSPECTION PROCEDURE
1. SELF-DIAGNOSIS RESULT CHECK
Check self-diagnosis results.
Is the above displayed in the self-diagnosis display items?
YES >> GO TO 2.
NO >> Inspection End.
2. CONNECTOR INSPECTION
1. Disconnect the ABS actuator and electric unit (control unit) connector E125.
2. Check the terminals for deformation, disconnection, looseness or damage.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace as necessary. Brake pedal depressed : Battery voltage
(approx. 12V)
Brake pedal not depressed : Approx. 0V
WFIA0198E
Continuity should exist
WFIA0431E
Self-diagnosis results
BATTERY VOLTAGE
Page 1074 of 3383
![INFINITI QX56 2006 Factory Service Manual TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMSBRC-47
[VDC/TCS/ABS]
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Revision: November 2009 2006 QX56
3. ABS/TCS/VDC CONTROL UNIT POWER AND GROUND CIRCUIT INSPECTION
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[VDC/TCS/ABS]
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3. ABS/TCS/VDC CONTROL UNIT POWER AND GROUND CIRCUIT INSPECTION
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TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMSBRC-47
[VDC/TCS/ABS]
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BRC
Revision: November 2009 2006 QX56
3. ABS/TCS/VDC CONTROL UNIT POWER AND GROUND CIRCUIT INSPECTION
Measure the voltage and continuity between the ABS actuator and electric unit (control unit) harness connec-
tor E125 and body ground.
OK or NG
OK >> Check the battery for loose terminals, low voltage, etc. Repair as necessary.
NG >> Repair the circuit.
Brake Fluid Level Switch System InspectionEFS004Y0
INSPECTION PROCEDURE
1. SELF-DIAGNOSIS RESULT CHECK
1. Check the brake reservoir tank fluid level. If the level is low, add brake fluid.
2. Erase the self-diagnosis results and check the self-diagnosis results.
Is the above displayed in the self-diagnosis display items?
YES >> GO TO 2.
NO >> Inspection End.
2. CONNECTOR INSPECTION
1. Disconnect the ABS actuator and electric unit (control unit) connector E125 and brake fluid level switch connector E21.
2. Check the terminals for deformation, disconnection, looseness or damage.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace as necessary.
3. CHECK THE HARNESS BETWEEN THE BRAKE FLUID LEVEL SWITCH AND THE ABS ACTUATOR
AND ELECTRIC UNIT (CONTROL UNIT)
Check the continuity between the brake fluid level switch harness connector E21 and the ABS actuator and
electric unit (control unit) harness connector E125.
OK or NG
OK >> GO TO 4.
NG >> Repair the circuit. Signal name
ABS actuator and electric unit
(control unit)
harness connector E125 Body
ground Measured value
Power supply 1
— Battery voltage (Approx. 12V)
32
Ground 16
—Continuity should exist.
47
Self-diagnosis results
BR FLUID LEVEL LOW
ABS actuator and electric unit
(control unit) harness connector E125 Brake fluid level switch harness
connector E21 Continuity
81Y es
8 Ground No
Ground 2Yes
Page 1087 of 3383
![INFINITI QX56 2006 Factory Service Manual BRC-60
[VDC/TCS/ABS]
TROUBLE DIAGNOSES FOR SYMPTOMS
Revision: November 20092006 QX56
ABS Warning Lamp Does Not Come On When Ignition Switch Is Turned OnEFS004YE
1. CHECK ABS ACTUATOR AND ELECTRIC UNIT](/img/42/57028/w960_57028-1086.png "INFINITI QX56 2006 Factory Service Manual BRC-60
[VDC/TCS/ABS]
TROUBLE DIAGNOSES FOR SYMPTOMS
Revision: November 20092006 QX56
ABS Warning Lamp Does Not Come On When Ignition Switch Is Turned OnEFS004YE
1. CHECK ABS ACTUATOR AND ELECTRIC UNIT")
BRC-60
[VDC/TCS/ABS]
TROUBLE DIAGNOSES FOR SYMPTOMS
Revision: November 20092006 QX56
ABS Warning Lamp Does Not Come On When Ignition Switch Is Turned OnEFS004YE
1. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) FUSES
Check 30A fusible link h and 40A fusible link i for ABS actuator and electric unit (control unit). For fusible link
layout, refer to PG-4, "
POWER SUPPLY ROUTING CIRCUIT" .
OK or NG
OK >> GO TO 2.
NG >> If fusible link is blown, be sure to eliminate cause of problem before replacing.
2. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) POWER SUPPLY CIRCUITS
1. Disconnect ABS actuator and electric unit (control unit) connec- tor.
2. Check voltage between ABS actuator and electric unit (control unit) connector terminal 1 and ground and terminal 32 and
ground.
Does battery voltage exist?
YES >> GO TO 3.
NO >> Repair harness or connectors between fusible link and ABS actuator and electric unit (control unit).
3. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) GROUND CIRCUIT
Check continuity between ABS actuator and electric unit (control
unit) connector terminal 16 and ground and terminal 47 and ground.
Does continuity exist?
YES >> Replace ABS actuator and electric unit (control unit). Refer to BRC-66, "
Removal and Installation" .
NO >> Repair harness or connectors between ABS actuator and electric unit (control unit) and ground.
ABS Warning Lamp Stays On When Ignition Switch Is Turned OnEFS004YF
1. CARRY OUT SELF-DIAGNOSIS
Carry out self-diagnosis. Refer to BRC-29, "
SELF-DIAGNOSIS" .
Are malfunctions detected in self-diagnosis?
YES >> Refer to BRC-30, "Display Item List" .
NO >> Refer to DI-31, "
WARNING LAMPS" .
WFIA0199E
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