4WD INFINITI QX56 2011 Factory Owner's Manual

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)BRC-51
< ECU DIAGNOSIS INFORMATION > [WITH VDC]
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*: Models with 4WD system
DTC IndexINFOID:0000000006222583
3  C1118 4WD SYSTEM
*
 C1130 ENGINE SIGNAL 1
 C1144 ST ANG SEN SIGNAL
4  C1109 BATTERY VOLTAGE [ABNORMAL]
 C 1111 P U M P M O T O R
C1140 ACTUATOR RLY
5  C1101 RR RH SENSOR-1
 C1102 RR LH SENSOR-1
 C1103 FR RH SENSOR-1
 C1104 FR LH SENSOR-1
 C1105 RR RH SENSOR-2
 C1106 RR LH SENSOR-2
 C1107 FR RH SENSOR-2
 C1108 FR LH SENSOR-2
 C1115 ABS SENSOR [ABNORMAL SIGNAL]
 C1116 STOP LAMP SW
 C1120 FR LH IN ABS SOL
 C1121 FR LH OUT ABS SOL
 C1122 FR RH IN ABS SOL
 C1123 FR RH OUT ABS SOL
 C1124 RRLH IN ABS SOL
 C1125 RR LH OUT ABS SOL
 C1126 RR RH IN ABS SOL
 C1127 RR RH OUT ABS SOL
 C1142 PRESS SEN CIRCUIT
 C1143 ST ANG SEN CIRCUIT
 C1145 YAW RATE SENSOR
 C1146 SIDE G-SEN CIRCUIT
 C1160 DECEL G SEN SET
C1164 CV 1
C1165 CV 2
 C1166 SV 1
 C1167 SV 2
6  C1155 BR FLUID LEVEL LOW
 C118E ACCUMULATOR PRESS
Priority Detected item (DTC)
DTC Items (CONSULT screen terms) Reference
C1101 RR RH SENSOR-1
BRC-68, "
DTC Logic"C1102 RR LH SENSOR-1
C1103 FR RH SENSOR-1
C1104 FR LH SENSOR-1
C1105 RR RH SENSOR-2BRC-70, "
DTC Logic"C1106 RR LH SENSOR-2
C1107 FR RH SENSOR-2
C1108 FR LH SENSOR-2
C1109 BATTERY VOLTAGE [ABNORMAL]BRC-72, "
DTC Logic"
C 1111 P U M P M O T O RBRC-75, "DTC Logic"
C1115 ABS SENSOR [ABNORMAL SIGNAL] BRC-77, "DTC Logic"
C1116 STOP LAMP SWBRC-79, "DTC Logic"
C 111 8*4WD SYSTEMBRC-87, "DTC Logic"
C1120 FR LH IN ABS SOL BRC-88, "DTC Logic"
Revision: 2010 May2011 QX56

BRC-52
< ECU DIAGNOSIS INFORMATION >[WITH VDC]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
*: Models with 4WD system
C1121 FR LH OUT ABS SOL
BRC-90, "DTC Logic"
C1122 FR RH IN ABS SOLBRC-88, "DTC Logic"
C1123 FR RH OUT ABS SOLBRC-90, "DTC Logic"
C1124 RRLH IN ABS SOLBRC-88, "DTC Logic"
C1125 RR LH OUT ABS SOLBRC-90, "DTC Logic"
C1126 RR RH IN ABS SOLBRC-88, "DTC Logic"
C1127 RR RH OUT ABS SOLBRC-90, "DTC Logic"
C1130 ENGINE SIGNAL 1BRC-92, "DTC Logic"
C1140 ACTUATOR RLYBRC-93, "DTC Logic"
C1142 PRESS SEN CIRCUITBRC-95, "DTC Logic"
C1143 ST ANG SEN CIRCUITBRC-97, "DTC Logic"
C1144 ST ANG SEN SIGNALBRC-99, "DTC Logic"
C1145 YAW RATE SENSOR
BRC-100, "DTC Logic"C1146 SIDE G-SEN CIRCUIT
C1155 BR FLUID LEVEL LOWBRC-103, "
DTC Logic"
C1160 DECEL G SEN SETBRC-105, "DTC Logic"
C1164 CV 1
BRC-106, "DTC Logic"C1165 CV 2
C1166 SV 1BRC-108, "
DTC Logic"C1167 SV 2
C1170 VARIANT CODING BRC-110, "
DTC Logic"
C118E ACCUMULATOR PRESS BRC-111, "DTC Logic"
U1000 CAN COMM CIRCUITBRC-112, "DTC Logic"
DTC Items (CONSULT screen terms) Reference
Revision: 2010 May2011 QX56

C1118 TRANSFER CONTROL UNITBRC-87
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
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C1118 TRANSFER CONTROL UNIT
DTC LogicINFOID:0000000006222607
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK DTC DETECTION
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Perform self-diagnosis for “ABS”.
Is DTC
“C 111 8” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-87, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222608
1.CHECK TRANSFER CO NTROL UNIT SYSTEM
With CONSULT-III.
Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is any DTC detected?
YES >> Check the DTC.
NO >> GO TO 2.
2.CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
With CONSULT-III.
1. Erase Self-diagnosis result for “ABS”.
2. Turn the ignition switch OFF.
3. Start the engine and drive the vehicle for a short period of time.
4. Check that the 4WD warning lamp turns OFF.
5. After the vehicle stops, perform self-diagnosis for “ABS”.
Is DTC
“C 111 8” detected?
YES >> Replace ABS actuator and electric unit (control unit). Refer to BRC-137, "Removal and Installa-
tion".
NO >> Check pin terminals and connection of each harness connector for abnormal conditions. Repair or
replace error-detected parts.
DTC Display Item Malfunction detected condition Possible causes
C1118 4WD SYSTEM When a malfunction is detected in transfer control unit
system.  Transfer control unit
 ABS actuator and electric unit
(control unit)
 CAN communication line
Revision: 2010 May2011 QX56

VDC OFF SWITCHBRC-119
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
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VDC OFF SWITCH
Component Function CheckINFOID:0000000006222646
1.CHECK VDC OFF SWITCH OPERATION
Check that VDC OFF indicator lamp in combinati on meter turns ON/OFF when VDC OFF switch is operated.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Proceed to diagnosis procedure. Refer to BRC-119, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006222647
NOTE:
VDC OFF switch is integrated in SNOW MODE / TOW MODE / VDC OFF switch assembly (2WD models) or
4WD switch assembly (4WD models).
1.CHECK VDC OFF SWITCH CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect ABS actuator and electric unit (control unit) harness connector.
3. Disconnect SNOW MODE / TOW MODE / VDC OFF s witch assembly (2WD models) or 4WD switch
assembly (4WD models) harness connector.
4. Check continuity between ABS actuator and elec tric unit (control unit) harness connector and SNOW
MODE / TOW MODE / VDC O FF switch assembly (2WD models) or 4WD switch assembly (4WD models)
harness connector.
*1: SNOW MODE / TOW MODE / VDC OFF switch assembly (2WD models)
*2: 4WD switch assembly (4WD models)
5. Check continuity between ABS actuator and electr ic unit (control unit) harness connector terminal and
ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace error-detected parts.
2.CHECK VDC OFF SW ITCH GROUND CIRCUIT
Check continuity between SNOW MODE / TOW MODE / VDC OFF switch assembly (2WD models) or 4WD
switch assembly (4WD models) harness connector terminal and ground.
*1: SNOW MODE / TOW MODE / VDC OFF switch assembly (2WD models)
*2: 4WD switch assembly (4WD models)
ABS actuator and electric unit (control unit)SNOW MODE / TOW MODE / VDC OFF
switch assembly (2WD models) or 4WD switch assembly (4WD models) Continuity
Connector Terminal Connector Terminal
E36 39 M147
*1
M54*21 Existed
ABS actuator and electric unit (control unit) —Continuity
Connector Terminal
E36 39 Ground Not existed
SNOW MODE / TOW MODE / VDC
OFF switch assembly (2WD models) or 4WD switch assembly (4WD models) —Continuity
Connector Terminal M147
*1
M54*220 Ground Existed
Revision: 2010 May2011 QX56

BRC-120
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
VDC OFF SWITCH
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace error-detected parts.
3.CHECK VDC OFF SWITCH
Check VDC OFF switch. Refer to BRC-120, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 4.
NO >> Replace VDC OFF switch. Refer to BRC-140, "
Removal and Installation".
4.CHECK VDC OFF SWITCH SIGNAL
With CONSULT-III.
1. Connect ABS actuator and electric unit (control unit) harness connector.
2. Connect SNOW MODE / TOW MODE / VDC OFF switch assembly (2WD models) or 4WD switch assem-
bly (4WD models) harness connector.
3. Select “ABS”, “DATA MONITOR” and “OFF SW” accord ing to this order. Check VDC OFF switch signal.
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 5.
5.CHECK TERMINAL
 Check ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with har-
ness connector.
 Check SNOW MODE / TOW MODE / VDC OFF switch assembly (2WD models) or 4WD switch assembly (4WD models) pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES >> Replace ABS actuator and electr ic unit (control unit). Refer to BRC-137, "Removal and Installa-
tion".
NO >> Repair or replace error-detected parts.
Component InspectionINFOID:0000000006222648
NOTE:
VDC OFF switch is integrated in SNOW MODE / TOW MODE / VDC OFF switch assembly (2WD models) or
4WD switch assembly (4WD models).
1.CHECK VDC OFF SWITCH
1. Turn the ignition switch OFF.
2. Disconnect SNOW MODE / TOW MODE / VDC OFF s witch assembly (2WD models) or 4WD switch
assembly (4WD models) harness connector.
3. Check continuity between terminals of SNOW MO DE / TOW MODE / VDC OFF switch assembly (2WD
models) or 4WD switch assembly (4WD models) connector.
Is the inspection result normal?
YES >> INSPECTION END
Condition DATA MONITOR
When VDC OFF switch is pressed and VDC OFF indicator
lamp in combination meter is in ON status On
When VDC OFF switch is pressed and VDC OFF indicator
lamp in combination meter is in OFF status Off
SNOW MODE / TOW MODE / VDC OFF
switch assembly (2WD models) or 4WD switch assembly (4WD models) Condition Continuity
Terminal
1 – 20 When VDC OFF switch is pressed Existed
When VDC OFF switch is not pressed Not existed
Revision: 2010 May2011 QX56

EXCESSIVE OPERATION FREQUENCYBRC-127
< SYMPTOM DIAGNOSIS > [WITH VDC]
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SYMPTOM DIAGNOSIS
EXCESSIVE OPERATION FREQUENCY
DescriptionINFOID:0000000006222657
VDC function, TCS function, ABS functi on, EBD function, hill start assist function and brake limited slip differ-
ential (BLSD) function operates in excessive operation frequency.
Diagnosis ProcedureINFOID:0000000006222658
1.CHECK BRAKING FORCE
Check brake force using a brake tester.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Check brake system.
2.CHECK FRONT AND REAR AXLE
Check that there is no excessive looseness in front and rear axle.
 Front axle: Refer to FA X - 7 , "
Inspection" (2WD), FAX-16, "Inspection" (4WD).
 Rear axle: Refer to RAX-5, "
Inspection"
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace error-detected parts.
3.CHECK WHEEL SENSOR
Check wheel sensor.
 Check installation and damage of wheel sensor.
 Check connection of wheel sensor harness connector.
 Check terminal of wheel sensor harness connector.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace wheel sensor.  Front wheel sensor: Refer to BRC-134, "
FRONT WHEEL SENSOR : Removal and Installation".
 Rear wheel sensor: Refer to BRC-135, "
REAR WHEEL SENSOR : Removal and Installation".
4.CHECK WARNING LAMP TURNS OFF
Check that ABS warning lamp, brake warning lamp and VDC warning lamp turn OFF approx. 1 second after
key switch is turned ON and stay in OFF status during driving.
CAUTION:
Brake warning lamp turns ON when parking brake is operated (parking brake switch is ON) or brake
fluid is less than the specified level (brake fluid level switch is ON).
Is the inspection result normal?
YES >> Normal
NO >> Perform self-diagnosis for “ABS” with CONSULT-III.
Revision: 2010 May2011 QX56

BRC-128
< SYMPTOM DIAGNOSIS >[WITH VDC]
UNEXPECTED BRAKE PEDAL REACTION
UNEXPECTED BRAKE PEDAL REACTION
DescriptionINFOID:0000000006222659
A malfunction of brake pedal feel (height or ot
hers) is detected when brake pedal is depressed.
Diagnosis ProcedureINFOID:0000000006222660
1.CHECK FRONT AND REAR AXLE
Check that there is no excessive looseness in front and rear axle.
 Front axle: Refer to FAX-7, "
Inspection" (2WD), FAX-16, "Inspection" (4WD).
 Rear axle: Refer to RAX-5, "
Inspection"
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace error-detected parts.
2.CHECK DISC ROTOR
Check disc rotor runout.
 Front: Refer to BR-16, "
DISC ROTOR : Inspection and Adjustment".
 Rear: Refer to BR-18, "
DISC ROTOR : Inspection and Adjustment".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Refinish or replace disc rotor.  Front: Refer to BR-16, "
DISC ROTOR : Inspection and Adjustment".
 Rear: Refer to BR-18, "
DISC ROTOR : Inspection and Adjustment".
3.CHECK BRAKE FLUID LEACKAGE
Check fluid leakage.
 Front: Refer to BR-24, "
FRONT : Inspection".
 Rear: Refer to BR-26, "
REAR : Inspection".
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace error-detected parts.
4.CHECK BRAKE PEDAL
Check each item of brake pedal. Refer to BR-7, "
Inspection and Adjustment".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Adjust each item of brake pedal. Refer to BR-7, "
Inspection and Adjustment".
5.CHECK BRAKING FORCE
Check brake force using a brake tester.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Check each components of brake system.
6.CHECK BRAKE PERFORMANCE
Disconnect ABS actuator and electric unit (control unit) connector so that ABS does not operate. Check that
brake force is normal in this condition. Connect harness connectors after checking.
Is the inspection result normal?
YES >> Normal
NO >> Check each components of brake system.
Revision: 2010 May2011 QX56

NORMAL OPERATING CONDITIONBRC-133
< SYMPTOM DIAGNOSIS > [WITH VDC]
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NORMAL OPERATING CONDITION
DescriptionINFOID:0000000006222669
Symptom Result
Brake pedal slightly vibrates and operation sound (motor sound and sound from suspen-
sion) occurs when VDC function, TCS function, ABS function, EBD function, hill start assist
function and brake limited slip differential (BLSD) function operates. This is not a malfunction, The symptom
occurs VDC function
, TCS function, ABS
function, EBD function, hill start assist
function and brake limited slip differential
(BLSD) function that are normally operat-
ed.
Brake stopping distance may become longer than models without ABS function depending
on the road conditions, when
ABS function is operated on slip pery road like rough road,
gravel road or snowy road.
Brake pedal vibrates and operation sound occurs during sudden acceleration and corner-
ing, when VDC function, TCS function, hill start assist function and brake limited slip differ-
ential (BLSD) function is operated.
Brake pedal vibrates and motor sound from the engine room occurs, when the engine starts
or the vehicle starts just after starting the engine This is not a malfunction. The symptom
occurs during the brake fluid accumula-
tion in the accumulator and operational
check of the ABS actuator and electric
unit (control unit).
Acceleration may be felt insufficient depending on the road conditions. This is not a malfunction. The symptom occurs TCS function that puts the highest
priority to obtain the optimum traction
(stability).
TCS may operate momentarily, while driving on a road where friction coefficient varies, or
when downshifting or fully depressing accelerator pedal
ABS warning lamp and VDC warning lamp may turn ON, when the vehicle is on a rotating
turntable or is given a strong shaking or large vibrations on a ship while the engine is run-
ning.
In this case, restart the engine on a nor-
mal road. If the normal condition is re-
stored, there is no malfunction. In that
case, erase self-diagnosis result memory
for “ABS” with CONSULT-III.
VDC warning lamp may turn ON and VDC function, TCS function, hill start assist function
and brake limited slip differential (BLSD) function may not normally operate, when driving
on a special road the is extremely slanted (bank in a circuit course).
A malfunction in yaw rate/side/decel G sensor system may be detected when the vehicle
sharply turns during a spin turn, acceleration turn or drift driving while VDC function and
TCS function are OFF (VDC OFF switch is pressed and VDC OFF indicator lamp is in ON
status).
The vehicle speed does not increase, when the accelerator pedal is depressed while the
vehicle is on a 2-wheel chassis dynamometer for speedometer check.
This is not malfunction. (When checking
the vehicle on a chassis dynamometer,
operate VDC OFF switch so that TCS
function is OFF.)
The VDC warning lamp, ABS warn ing lamp and brake warning lamp turn ON and DTC
“C118E” may be detected in self-diagnosis resu lt of “ABS” when the brake pedal is exces-
sively operated, such as air bleeding. This is not a system malfunction because
this occurs due to the temporary de-
crease in accumulator fluid pressure. The
system returns to no
rmal condition when
the accumulator fluid pressure reaches
the specified pressure with the ignition
switch ON and the VDC warning lamp,
ABS warning lamp, a nd brake warning
lamp turn OFF. After these steps, ABS
self-diagnosis results are erased.
VDC OFF indicator lamp turns ON and TCS function is not operate when 4WD mode is “4L”.
(Models with 4WD system) This is not a malfunction. When the 4WD
mode becomes “4L” state, the TCS func-
tion is disabled. This function is enabled
when the 4WD mode becomes “AUTO”
or “4H”.
Revision: 2010 May2011 QX56

BRC-134
< REMOVAL AND INSTALLATION >[WITH VDC]
WHEEL SENSOR
REMOVAL AND INSTALLATION
WHEEL SENSOR
FRONT WHEEL SENSOR
FRONT WHEEL SENSOR : Exploded ViewINFOID:0000000006222670
CAUTION:
Replace wheel hub and bearing
assembly as an assembly when repl acing because wheel sensor can-
not be disassembled.
NOTE:
Front RH wheel sensor is symmetrically opposite of LH.
FRONT WHEEL SENSOR : Removal and InstallationINFOID:0000000006222671
CAUTION:
Replace wheel hub and bearing assembly as an assembly when repl acing because wheel sensor can-
not be disassembled.
REMOVAL
Remove wheel hub and bearing assembly. Refer to FA X - 8 , "Removal and Installation" (2WD), FAX-18,
"Removal and Installation" (4WD).
CAUTION:
Never twist or pull front wheel sensor harness.
INSTALLATION
Note the following, and install in the reverse order of the removal.
1. Front LH wheel sensor harness con-
nector 2. Front LH wheel sensor 3. Bracket
: Vehicle front
Refer to GI-4, "
Components" for symbols in the figure.
JPFIC0199GB
Revision: 2010 May2011 QX56

BRC-136
< REMOVAL AND INSTALLATION >[WITH VDC]
SENSOR ROTOR
SENSOR ROTOR
FRONT SENSOR ROTOR
FRONT SENSOR ROTOR : Re
moval and InstallationINFOID:0000000006222674
CAUTION:
Replace wheel hub and bearing assembly as an assem bly when replacing because sensor rotor can-
not be disassembled.
REMOVAL
Remove wheel hub and bearing assembly. Refer to FA X - 8 , "Removal and Installation" (2WD), FAX-18,
"Removal and Installation" (4WD).
INSTALLATION
Install wheel hub and bearing assembly. Refer to FA X - 8 , "Removal and Installation" (2WD), FAX-18, "Removal
and Installation" (4WD).
REAR SENSOR ROTOR
REAR SENSOR ROTOR : Removal and InstallationINFOID:0000000006222675
CAUTION:
Replace wheel hub and bearing assembly as an assem bly when replacing because sensor rotor can-
not be disassembled.
REMOVAL
Remove wheel hub and bearing assembly. Refer to RAX-7, "Removal and Installation".
INSTALLATION
Install wheel hub and bearing assembly. Refer to RAX-7, "Removal and Installation".
Revision: 2010 May2011 QX56