steering INFINITI QX56 2011 Factory Service Manual

BRC-46
< ECU DIAGNOSIS INFORMATION >[WITH VDC]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
ABS WARN LAMPWhen ABS warning lamp is ON
(Note 2)On
When ABS warning lamp is OFF
(Note 2)Off
OFF LAMP When VDC OFF indicator lamp is ON
(Note 2)On
When VDC OFF indicator lamp is OFF
(Note 2)Off
OFF SW VDC OFF switch ON On
VDC OFF switch OFF Off
SLIP/VDC LAMP When VDC warning lamp is ON or Blinking
(Note 2)On
When VDC warning lamp is OFF
(Note 2)Off
BATTERY VOLT Ignition switch ON 10 – 16 V
GEAR Driving 1 – 7
Depending on shift status
ENGINE SPEED Engine stopped 0 tr/min
Engine running Almost same reading as tachometer
YAW RATE SEN Vehicle stopped Approx. 0 d/s
Turning right Negative value
Turning left Positive value
R POSI SIG When selector lever is in the R position On
When selector lever is in the other position than R Off
4WD MODE MON
(Note 3)
When 4WD sift switch is AUTO position AUTO
When 4WD sift switch is 4H position LOCK
When 4WD sift switch is 4L position ##
N POSI SIG When selector lever is in the N position On
When selector lever is in the other position than N Off
CV1 Active On
Inactive Off
CV2 Active On
Inactive Off
SV1 Active On
Inactive Off
SV2 Active On
Inactive Off
STOP LAMP SW2 Brake pedal depressed On
Brake pedal not depressed Off
ACCEL POS SIG Never depress accelerator pedal
(with ignition switch ON)
0%
Depress accelerator pedal
(with ignition switch ON) 0 – 100%
SIDE G-SENSOR Vehicle stopped
Approx. 0 m/s
2
Right turn Negative value
Left turn Positive value
STR ANGLE SIG When driving straight 0
±2.5 °
When steering wheel is steered to LH by 90 °Approx. +90 °
When steering wheel is steered to RH by 90 °Approx. –90 °
Monitor item Condition Reference values in normal operation
Revision: 2010 May2011 QX56

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)BRC-49
< ECU DIAGNOSIS INFORMATION > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
C 111 5 When difference in wheel speed between any wheel and others is detected during
the vehicle is driven, because of installation of other tires than specified. The following functions are sus-
pended.
 VDC function
 TCS function
 ABS function
 hill start assist function
 Brake limited slip differential
(BLSD) function
C 111 6
 When stop lamp switch signal is not input when brake pedal depress.
 When stop lamp switch signal is not input when stop lamp relay operates.
C 111 8
*1When a malfunction is detected in transfer control unit system.
C1120 When a malfunction is detec ted in front LH ABS IN valve.
The following functions are sus-
pended.
 VDC function
 TCS function
 ABS function
 EBD function
 hill start assist function
 Brake limited slip differential (BLSD) function
C1121 When a malfunction is detec
ted in front LH ABS OUT valve.
C1122 When a malfunction is detected in front RH ABS IN valve.
C1123 When a malfunction is det ected in front RH ABS OUT valve.
C1124 When a malfunction is detected in rear LH ABS IN valve.
C1125 When a malfunction is detected in rear LH ABS OUT valve.
C1126 When a malfunction is det ected in rear RH ABS IN valve.
C1127 When a malfunction is detected in rear RH ABS OUT valve.
C1130 When a malfunction is detected in ECM system. The following functions are sus-
pended.
 VDC function
 TCS function
 hill start assist function
 Brake limited slip differential
(BLSD) function
C1140 When a malfunction is detected in actuator relay. The following functions are sus-
pended.
 VDC function
 TCS function
 ABS function
 EBD function
 hill start assist function
 Brake limited slip differential
(BLSD) function
C1142
*2When a malfunction is detected in master cylinder pressure sensor or control pres-
sure sensor. The following functions are sus-
pended.
 VDC function
 TCS function
 hill start assist function
 Brake limited slip differential
(BLSD) function
C1143 When a malfunction is detected in steering angle sensor.
C1144 When neutral position adjustment of steering angle sensor is not complete.
C1145
 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.
The following functions are sus-
pended.
 VDC function
 TCS function
 ABS function
 hill start assist function
 Brake limited slip differential
(BLSD) function
C1146 When a malfunction is detected in side/decel G signal.
C1155
 When brake fluid level low signal is detected.
 When an open circuit is detected in brake fluid level switch circuit.
C1160 When calibration of yaw rate/side/decal G sensor is not complete.
C1164 When a malfunction is detected in cut valve 1. The following functions are sus- pended.
 VDC function
 TCS function
 ABS function
 EBD function
 hill start assist function
 Brake limited slip differential (BLSD) function
C1165 When a malfunction is detected in cut valve 2.
C1166 When a malfunction is detected in suction valve 1.
C1167 When a malfunction is detected in suction valve 2. DTC Malfunction detected condition Fail-safe condition
Revision: 2010 May2011 QX56

DIAGNOSIS AND REPAIR WORK FLOWBRC-61
< BASIC INSPECTION > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
YES >> GO TO 7.
NO >> Check harness and connectors based on the in formation obtained by interview. Refer to GI-40,
"Intermittent Incident".
7.FINAL CHECK
With CONSULT-III.
1. Check the reference value for “ABS”.
2. Recheck the symptom and check that the sympt om is not reproduced on the same conditions.
Is the symptom reproduced?
YES >> GO TO 3.
NO >> INSPECTION END
Diagnostic Work SheetINFOID:0000000006222586
Description
 In general, customers have their own criteria for a pr oblem. Therefore, it is important to understand the
symptom and status well enough by asking the customer about his/her concerns carefully. To systemize all
the information for the diagnosis, prepare the in terview sheet referring to the interview points.
 In some cases, multiple conditions that appear simultaneously may cause a DTC to be detected.
INTERVIEW SHEET SAMPLE
Interview sheet
Customer
name MR/MSRegistration
number
Initial year
registration
Vehicle type VIN
Storage date Engine Mileage km ( Mile)
Symptom †
Does not operate ( ) function
† Warning lamp for ( \
) turns ON.
† Noise † Vibration
† Other
( )
First occurrence † Recently † Other ( )
Frequency of occurrence † Always † Under a certain conditions of † Sometimes ( time(s)/day)
Climate con-
ditions †
Irrelevant
Weather † Fine † Cloud † Rain †Snow † Others ( )
Temperature † Hot †Warm † Cool † Cold † Temperature [Approx. °C ( °F)]
Relative humidity † High † Moderate † Low
Road conditions †
Urban area † Suburb area † Highway
† Mountainous road (uphill or downhill) †Rough road
Operating condition, etc. †
Irrelevant
† When engine starts † During idling
† During driving † During acceleration † At constant speed driving
† During deceleration
† During cornering (right curve or left curve)
† When steering wheel is steered (to right or to left)
Revision: 2010 May2011 QX56

BRC-64
< BASIC INSPECTION >[WITH VDC]
ADJUSTMENT OF STEERING ANGLE
SENSOR NEUTRAL POSITION
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION
DescriptionINFOID:0000000006222588
Always adjust the neutral position of steering angle sensor before driving when the following operation is per-
formed.
× : Required —: Not required
Work ProcedureINFOID:0000000006222589
ADJUST THE NEUTRAL POSITION OF STEERING ANGLE SENSOR
CAUTION:
Always use CONSULT-III when adju sting the neutral position of steering angle sensor. (It cannot be
adjusted other than with CONSULT-III.)
1.CHECK THE VEHICLE STATUS
Stop vehicle with front wheels in the straight-ahead position.
Does the vehicle stay in the straight-ahead position?
YES >> GO TO 2.
NO >> Steer the steering wheel to the st raight-ahead position. Stop the vehicle.
2.ADJUST NEUTRAL POSITION OF STEERING ANGLE SENSOR
With CONSULT-III.
1. Turn the ignition switch ON.
CAUTION:
Never start engine.
2. Select “ABS”, “WORK SUPPORT” and “ST AN GLE SENSOR ADJUSTMENT” in this order.
3. Select “START”. CAUTION:
Never touch steering wheel while adjusting steering angle sensor.
4. After approx. 10 seconds, select “END”.
5. Turn ignition switch OFF and then turn it ON again. CAUTION:
Be sure to perform the operation above.
>> GO TO 3.
3.CHECK DATA MONITOR
With CONSULT-III.
1. The vehicle is either pointing straight ahead or t he vehicle needs to be moved. Stop when it is pointing
straight ahead.
Procedure Adjust the neutral position of steering angle sensor
Removing/ installing ABS actuator and electric unit (control unit) —
Replacing ABS actuator and electric unit (control unit) —
Removing/installing steering angle sensor ×
Replacing steering angle sensor ×
Removing/installing steering components ×
Replacing steering components ×
Removing/installing suspension components ×
Replacing suspension components ×
Removing/installing tire —
Replacing tire —
Tire rotation —
Adjusting wheel alignment. ×
Revision: 2010 May2011 QX56

ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION
BRC-65
< BASIC INSPECTION > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
2. Select “ABS”, “DATA MONITOR”, “ECU INPUT SIGNAL S” and “STR ANGLE SIG” in the order. Check that
the signal is within the specified value.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 1.
4.ERASE SELF-DIAGNOSIS MEMORY
With CONSULT-III.
Erase Self-diagnosis result of “ABS”.
Are the memories erased?
YES >> INSPECTION END
NO >> Check the items indica ted by the self-diagnosis.
STR ANGLE SIG : 0
±2.5 °
Revision: 2010 May2011 QX56

BRC-66
< BASIC INSPECTION >[WITH VDC]
CALIBRATION OF DECEL G SENSOR
CALIBRATION OF DECEL G SENSOR
DescriptionINFOID:0000000006222590
CAUTION:
Always perform the decel G sensor cal
ibration before driving when the following operation is per-
formed.
NOTE:
Yaw rate/side/decel G sensor calibration is performed when performing the decel G sensor calibration.
× : Required —: Not required
Work ProcedureINFOID:0000000006222591
Decel G sensor calibration
CAUTION:
Always use CONSULT-III for the d ecel G sensor calibration. (It cannot be adjusted other than with
CONSULT-III.)
NOTE:
Yaw rate/side/decel G sensor calibration is performed when performing the decel G sensor calibration.
1.CHECK THE VEHICLE STATUS
1. Steer the steering wheel to the straight- ahead position. Stop the vehicle on level surface.
2. Stop the engine.
3. Turn the ignition switch OFF.
Is the vehicle stopped in the straight-ahead position on level surface?
YES >> GO TO 2.
NO >> Steer the steering wheel to the straight- ahead position. Stop the vehicle on level surface.
2.PERFORM DECEL G SENSOR CALIBRATION
CAUTION:
 Never allow passenger or load on the vehicle.
 Never apply vibration to the vehicle body when opening or closing door during calibration.
With CONSULT-III.
1. Turn the ignition switch ON.
CAUTION:
Never start engine.
2. Select “ABS”, “WORK SUPPORT”, “DECEL G-SENSOR CALIBRATION” in this order.
3. Select “START”.
4. After approx. 10 seconds, select “END”.
5. Turn ignition switch OFF and then turn it ON again. CAUTION:
Be sure to perform the operation above.
Procedure Decel G sensor calibration
Removing/ installing ABS actuator and electric unit (control unit) —
Replacing ABS actuator and electric unit (control unit) ×
Removing/installing steering components —
Replacing steering components —
Removing/installing suspension components —
Replacing suspension components —
Removing/installing tire —
Replacing tire —
Tire rotation —
Adjusting wheel alignment. —
Removing/installing yaw rate/side/decel G sensor ×
Replacing yaw rate/side/decel G sensor ×
Revision: 2010 May2011 QX56

CALIBRATION OF DECEL G SENSORBRC-67
< BASIC INSPECTION > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
>> GO TO 3.
3.CHECK DATA MONITOR
With CONSULT-III.
1. Drive the vehicle. Steer the steering wheel to t he straight-ahead position. Stop the vehicle on level sur-
face.
2. Select “ABS”, “DATA MONITOR”, “ECU INPUT SIGNAL S” and “DECEL G-SENSOR” in this order. Check
that the signal is within the specified value.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 1.
4.ERASE SELF-DIAGNOSIS MEMORY
With CONSULT-III.
Erase Self-diagnosis result of “ABS”.
Are the memories erased?
YES >> INSPECTION END
NO >> Check the items indica ted by the self-diagnosis.
DECEL G-SENSOR : Approx. 0 G
Revision: 2010 May2011 QX56

BRC-68
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1101, C1102, C1103,
C1104 WHEEL SENSOR
DTC/CIRCUIT DIAGNOSIS
C1101, C1102, C1103, C1104 WHEEL SENSOR
DTC LogicINFOID:0000000006222592
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
“C1101”, “C1102”, “C1103” or “C1104” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-68, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222593
CAUTION:
Never check between wheel sensor harness connector terminals.
1.CHECK WHEEL SENSOR HARNESS
1. Turn the ignition switch OFF.
2. Disconnect ABS actuator and electric unit (control unit) harness connector.
3. Disconnect wheel sensor harness connector.
4. Check continuity between ABS actuator and electr ic unit (control unit) harness connector and wheel sen-
sor harness connector. (Check continuity when steering wheel is steered to RH and LH, or center harness
in wheel housing is moved.)
Measurement connector and termi nal for power supply circuit
Measurement connector and te rminal for signal circuit
DTC Display Item Malfunction detected condition Possible causes
C1101 RR RH SENSOR-1 When an open circuit is detected in rear RH wheel
sensor circuit.
 Harness or connector
 Wheel sensor
 ABS actuator and electric unit (control unit)
C1102 RR LH SENSOR-1
When an open circuit is detected in rear LH wheel
sensor circuit.
C1103 FR RH SENSOR-1 When an open circuit is detected in front RH wheel
sensor circuit.
C1104 FR LH SENSOR-1 When an open circuit is detected in front LH wheel
sensor circuit.
ABS actuator and electric unit
(control unit) Wheel sensor
Continuity
Connector Terminal Connector Terminal
E36 20 E22 (Front LH wheel)
1 Existed
33 E39 (Front RH wheel)
22 C10 (Rear LH wheel)
35 C11 (Rear RH wheel)
ABS actuator and electric unit (control unit) Wheel sensor
Continuity
Connector Terminal Connector Terminal
E36 34 E22 (Front LH wheel)
2 Existed
19 E39 (Front RH wheel)
36 C10 (Rear LH wheel)
21 C11 (Rear RH wheel)
Revision: 2010 May2011 QX56

C1115 WHEEL SENSORBRC-77
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
C1115 WHEEL SENSOR
DTC LogicINFOID:0000000006222601
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK DTC DETECTION
With CONSULT-III.
1. Start engine and drive vehicle at approx. 30 km/h (19 MPH) or more for approx. 1 minute.
2. Perform self-diagnosis for “ABS”.
Is DTC
“C 111 5” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-77, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222602
CAUTION:
For wheel sensor, never check between terminals.
1.CHECK TIRE
1. Turn the ignition switch OFF.
2. Check tire air pressure, wear and size. Refer to WT-69, "
Tire Air Pressure".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Adjust air pressure. Or replace tire. Refer to WT-69, "
Tire Air Pressure".
2.CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) POWER SUPPLY SYSTEM
Check ABS actuator and electric unit (cont rol unit) power supply system. Refer to BRC-113, "
Diagnosis Proce-
dure".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace error-detected parts.
3.CHECK WHEEL SENSOR HARNESS
1. Disconnect ABS actuator and electric unit (control unit) harness connector.
2. Disconnect wheel sensor harness connector.
3. Check continuity between ABS actuator and electr ic unit (control unit) harness connector and wheel sen-
sor harness connector. (Check continuity when steering wheel is steered to RH and LH, or center harness
in wheel housing is moved.)
Measurement connector and termi nal for power supply circuit
DTC Display Item Malfunction detected condition Possible causes
C 111 5 ABS SENSOR
[ABNORMAL SIGNAL] When difference in wheel speed between any wheel
and others is detected during the vehicle is driven,
because of installation of other tires than specified.  Harness or connector
 Wheel sensor
 Sensor rotor
 ABS actuator and electric unit
(control unit)
ABS actuator and electric unit (control unit) Wheel sensor Continuity
Connector Terminal Connector Terminal
E36 20 E22 (Front LH wheel)
1 Existed
33 E39 (Front RH wheel)
22 C10 (Rear LH wheel)
35 C11 (Rear RH wheel)
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