ground INFINITI QX56 2011 Factory Service Manual

C1120, C1122, C1124, C1126 ABS IN VALVE SYSTEM
BRC-89
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
YES >> Perform trouble diagnosis for battery power supply. Refer to PG-11, "Wiring Diagram - BATTERY
POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
3.CHECK ABS IN VALVE GROUND CIRCUIT
1. Turn the ignition switch OFF.
2. Check continuity between ABS actuator and electr ic unit (control unit) harness connector and the ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace error-detected parts.
4.CHECK TERMINAL
Check ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with harness
connector.
Is the inspection result normal?
YES >> Replace ABS actuator and electric unit (control unit). Refer to BRC-137, "Removal and Installa-
tion".
NO >> Repair or replace error-detected parts.
ABS actuator and electric unit (control unit)
—Continuity
Connector Terminal
E36 2
Ground Existed
3
E37 48
Revision: 2010 May2011 QX56

BRC-90
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1121, C1123, C
1125, C1127 ABS OUT VALVE SYSTEM
C1121, C1123, C1125, C1127 ABS OUT VALVE SYSTEM
DTC LogicINFOID:0000000006222611
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
“C1121”, “C1123”, “C1125” or “C1127” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-90, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222612
1.CHECK ABS OUT VALVE POWER SUPPLY
1. Turn the ignition switch OFF.
2. Disconnect ABS actuator and electric unit (control unit) harness connector.
3. Check voltage between ABS actuator and electr ic unit (control unit) harness connector and ground.
4. Turn the ignition switch ON. CAUTION:
Never start engine.
5. Check voltage between ABS actuator and electr ic unit (control unit) harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK ABS OUT VALVE POWER SUPPLY CIRCUIT
1. Turn the ignition switch OFF.
2. Check 30A fusible link (L).
3. Check continuity and short circui t between ABS actuator and electric unit (control unit) harness connector
terminal (1) and 30A fusible link (L).
Is the inspection result normal?
DTC Display Item Malfunction detected condition Possible causes
C1121 FR LH OUT ABS SOL When a malfunction is dete
cted in front LH ABS OUT
valve.
 Harness or connector
 ABS actuator and electric unit (control unit)
 Fusible link
 Battery power supply system
C1123 FR RH OUT ABS SOL
When a malfunction is detected in front RH ABS OUT
valve.
C1125 RR LH OUT ABS SOL When a malfunction is detected in rear LH ABS OUT
valve.
C1127 RR RH OUT ABS SOL When a malfunction is detected in rear RH ABS OUT
valve.
ABS actuator and electric
unit (control unit)
—Voltage
Connector Terminal
E36 1 Ground Battery voltage
ABS actuator and electric unit (control unit)
—Voltage
Connector Terminal
E36 1 Ground Battery voltage
Revision: 2010 May2011 QX56

C1121, C1123, C1125, C1127 ABS OUT VALVE SYSTEM
BRC-91
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
YES >> Perform trouble diagnosis for battery power supply. Refer to PG-11, "Wiring Diagram - BATTERY
POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
3.CHECK ABS OUT VALVE GROUND CIRCUIT
1. Turn the ignition switch OFF.
2. Check continuity between ABS actuator and electr ic unit (control unit) harness connector and the ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace error-detected parts.
4.CHECK TERMINAL
Check ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with harness
connector.
Is the inspection result normal?
YES >> Replace ABS actuator and electric unit (control unit). Refer to BRC-137, "Removal and Installa-
tion".
NO >> Repair or replace error-detected parts.
ABS actuator and electric unit (control unit) —Continuity
Connector Terminal
E36 2
Ground Existed
3
E37 48
Revision: 2010 May2011 QX56

C1140 ACTUATOR RELAY SYSTEMBRC-93
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
C1140 ACTUATOR RELAY SYSTEM
DTC LogicINFOID:0000000006222615
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
“C1140” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-93, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222616
1.CHECK ACTUATOR RELAY POWER SUPPLY
1. Turn the ignition switch OFF.
2. Disconnect ABS actuator and electric unit (control unit) harness connector.
3. Check voltage between ABS actuator and electr ic unit (control unit) harness connector and ground.
4. Turn the ignition switch ON. CAUTION:
Never start engine.
5. Check voltage between ABS actuator and electr ic unit (control unit) harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK ACTUATOR RELAY POWER SUPPLY CIRCUIT
1. Turn the ignition switch OFF.
2. Check 30A fusible link (L).
3. Check continuity and short circuit between ABS act uator and electric unit (control unit) harness connector
terminal (1) and 30A fusible link (L).
Is the inspection result normal?
YES >> Perform trouble diagnosis for battery power supply. Refer to PG-11, "Wiring Diagram - BATTERY
POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
3.CHECK ACTUATOR RELAY GROUND CIRCUIT
DTC Display Item Malfunction detected condition Possible causes
C1140 ACTUATOR RLY When a malfunction is detected in actuator relay.  Harness or connector
 ABS actuator and electric unit
(control unit)
Fusible link
 Battery power supply system
ABS actuator and electric unit (control unit) —Voltage
Connector Terminal
E36 1 Ground Battery voltage
ABS actuator and electric unit (control unit)
—Voltage
Connector Terminal
E36 1 Ground Battery voltage
Revision: 2010 May2011 QX56

BRC-94
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1140 ACTUATOR RELAY SYSTEM
1. Turn the ignition switch OFF.
2. Check continuity between ABS actuator and electr
ic unit (control unit) harness connector and the ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace error-detected parts.
4.CHECK TERMINAL
Check ABS actuator and electric unit (control unit) 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.
ABS actuator and electric unit (control unit) — Continuity
Connector Terminal
E36 2
Ground Existed
3
E37 48
Revision: 2010 May2011 QX56

C1143 STEERING ANGLE SENSORBRC-97
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
C1143 STEERING ANGLE SENSOR
DTC LogicINFOID:0000000006222619
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
“C1143” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-97, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222620
1.CHECK STEERING ANGLE SE NSOR MOUNTING CONDITION
Check steering angle sensor mounting condition. Refer to SR-14, "
Exploded View".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace error-detected parts.
2.CHECK STEERING ANGLE SENSOR POWER SUPPLY
1. Turn the ignition switch OFF.
2. Disconnect steering angle sensor harness connector.
3. Check voltage between steering angle sensor harness connector and ground.
4. Turn the ignition switch ON. CAUTION:
Never start engine.
5. Check voltage between steering angle sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.CHECK STEERING ANGLE SENSOR POWER SUPPLY CIRCUIT
1. Turn the ignition switch OFF.
2. Check 10A fuse (#7).
DTC Display Item Malfunction detected condition Possible causes
C1143 ST ANG SEN CIRCUIT When a malfunction is detected in steering angle sen-
sor.  Harness or connector
 Steering angle sensor
 ABS actuator and electric unit
(control unit)
Fuse
 Ignition power supply system
 CAN communication line
Steering angle sensor — Voltage
Connector Terminal
M30 4 Ground Approx. 0 V
Steering angle sensor — Voltage
Connector Terminal
M30 4 Ground Battery voltage
Revision: 2010 May2011 QX56

BRC-98
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1143 STEERING ANGLE SENSOR
3. Disconnect fuse block (J/B) harness connector.
4. Check continuity between steering angle sensor
harness connector and fuse block (J/B) harness connec-
tor.
5. Check continuity between steering angle sensor harness connector and ground.
Is the inspection result normal?
YES >> Perform trouble diagnosis for ignition power supply. Refer to PG-89, "Wiring Diagram - IGNITION
POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
4.CHECK STEERING ANGL E SENSOR GROUND CIRCUIT
1. Turn the ignition switch OFF.
2. Check continuity between steering angle sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace error-detected parts.
5.CHECK TERMINAL
 Check steering angle sensor pin terminals for damage or loose connection with harness connector.
 Check fuse block (J/B) pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace error-detected parts.
6.CHECK CAN COMMUNICATION LINE
Check “STRG BRANCH LINE CIRCUIT”. Refer to LAN-81, "
Diagnosis Procedure".
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. Refer to BRC-7, "
Precaution for Harness Repair".
Steering angle sensor Fuse block (J/B)
Continuity
Connector Terminal Connector Terminal
M30 4 M1 2A Existed
Steering angle sensor —Continuity
Connector Terminal
M30 4 Ground Not existed
Steering angle sensor —Continuity
Connector Terminal
M30 1 Ground Existed
Revision: 2010 May2011 QX56

BRC-100
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1145, C1146 YAW RATE/SIDE/DECEL G SENSOR
C1145, C1146 YAW RATE/SIDE/DECEL G SENSOR
DTC LogicINFOID:0000000006222623
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
“C1145” or “C1146” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-100, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222624
CAUTION:
 A malfunction in yaw rate/side/ decel G sensor system may be det ected when the vehicle sharply
turns during a spin turn, acceleratio n turn or drift driving while VDC function is OFF (VDC OFF indi-
cator lamp is in ON status). This is not a malfun ction if the status returns to normal after engine is
started again. In that case, erase self-diagn osis result memory using CONSULT-III.
 When the engine is in running stat us and the vehicle is on a turntable at the entrance of parking lot
or on a moving unit, VDC warning lamp may tu rn ON and “ABS” self-diagnosis may display “YAW
RATE SENSOR”. In this case, yaw rate sensor is not malfunctioning. The status returns to normal
when the vehicle is left from the turntable or movi ng unit and the engine is started again. In that
case, erase self-diagnosis result memory using CONSULT-III.
1.CHECK YAW RATE/SIDE/DECEL G SENSOR MOUNTING CONDITION
Check yaw rate/side/decel G sensor mounting condition. Refer to BRC-138, "
Exploded View".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace error-detected parts.
2.CHECK YAW RATE/SIDE/DECE L G SENSOR POWER SUPPLY
1. Turn the ignition switch OFF.
2. Disconnect yaw rate/side/decel G sensor harness connector.
3. Check voltage between yaw rate/side/dec el G sensor harness connector and ground.
4. Turn the ignition switch ON. CAUTION:
Never start engine.
5. Check voltage between yaw rate/side/dec el G sensor harness connector and ground.
DTC Display Item Malfunction detected condition Possible causes
C1145 YAW RATE SENSOR  When a malfunction is detected in yaw rate signal.
 When yaw rate signal is not continuously received
for 2 seconds or more.
 When side G signal is not continuously received for 2 seconds or more.
 When decel G signal is not continuously received for 2 seconds or more.  Harness or connector
 Yaw rate/side/decel G sensor
 ABS actuator and electric unit
(control unit)
 Ignition power supply system
Fuse
C1146 SIDE G-SEN CIRCUIT When a malfunction is detected in side/decel G sig-
nal.
Yaw rate/side/decel G sensor
—Voltage
Connector Terminal
M55 3 Ground Approx. 0 V
Revision: 2010 May2011 QX56

C1145, C1146 YAW RATE/SIDE/DECEL G SENSOR
BRC-101
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.CHECK YAW RATE/SIDE/DECEL G SENSOR POWER SUPPLY CIRCUIT
1. Turn the ignition switch OFF.
2. Check 10A fuse (#57).
3. Disconnect IPDM E/R harness connector.
4. Check continuity between yaw rate/side/decel G sensor harness connector and IPDM E/R harness con-
nector.
5. Check continuity between yaw rate/side/decel G sensor harness connector and ground.
Is the inspection result normal?
YES >> Perform trouble diagnosis for ignition power supply. Refer to PG-89, "Wiring Diagram - IGNITION
POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
4.CHECK YAW RATE/SIDE/DECEL G SENSOR GROUND CIRCUIT
1. Turn the ignition switch OFF.
2. Check continuity between yaw rate/side/decel G sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace error-detected parts.
5.CHECK COMMUNICATION LINE (1)
1. Disconnect ABS actuator and electric unit (control unit) harness connector.
2. Check continuity between yaw rate/side/decel G sensor harness connector and ABS actuator and electric
unit (control unit) harness connector.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace error-detected parts.
Yaw rate/side/decel G sensor —Voltage
Connector Terminal
M55 3 Ground Battery voltage
Yaw rate/side/decel G sensor IPDM E/R Continuity
Connector Terminal Connector Terminal
M55 3 E15 59 Existed
Yaw rate/side/decel G sensor —Continuity
Connector Terminal
M55 3 Ground Not existed
Yaw rate/side/decel G sensor —Continuity
Connector Terminal
M55 6 Ground Existed
Yaw rate/side/decel G sens or ABS actuator and electric unit (control unit)
Continuity
Connector Terminal Connector Terminal
M55 4
E36 9
Existed
510
Revision: 2010 May2011 QX56

BRC-102
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1145, C1146 YAW RATE/SIDE/DECEL G SENSOR
6.CHECK COMMUNICATION LINE (2)
1. Connect ABS actuator and electric unit (control unit) harness connector.
2. Check resistance between yaw rate/side/decel G sensor harness connector terminals.
Is the inspection result normal?
YES >> GO TO 7.
NO >> Replace ABS actuator and electric unit (control unit). Refer to BRC-137, "
Removal and Installa-
tion".
7.CHECK COMMUNICATION LINE (3)
1. Disconnect ABS actuator and electric unit (control unit) harness connector.
2. Check continuity between yaw rate/side/ decel G sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 8.
NO >> Repair or replace error-detected parts.
8.CHECK TERMINAL
 Check ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with har-
ness connector.
 Check yaw rate/side/decel G sensor pin terminal s for damage or loose connection with harness connector.
 Check IPDM E/R pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES >> GO TO 9.
NO >> Repair or replace error-detected parts.
9.REPLACE YAW RATE/SIDE/DECEL G SENSOR
With CONSULT-III.
1. Connect ABS actuator and electric unit (control unit) harness connector.
2. Connect IPDM E/R harness connector.
3. Replace yaw rate/side/decel G sensor. Refer to BRC-138, "
Removal and Installation".
4. Erase Self-diagnosis result for “ABS”.
5. Turn the ignition switch OFF.
6. Turn the ignition switch ON. CAUTION:
Never start engine.
7. Perform self-diagnosis for “ABS”.
Is DTC
“C1145” or “C1146” detected?
YES >> Replace ABS actuator and electr ic unit (control unit). Refer to BRC-137, "Removal and Installa-
tion".
NO >> INSPECTION END
Yaw rate/side/decel G sensor Resistance
Connector Terminal
M55 4
100 – 140 Ω
5
Yaw rate/side/decel G sensor Ground Continuity
Connector Terminal
M55 4
— Not existed
5
Revision: 2010 May2011 QX56