INFINITI QX56 2010 Factory Service Manual

U1000 CAN COMM CIRCUITBRC-79
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
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U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000005148061
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
DTC LogicINFOID:0000000005148062
DTC DETECTION LOGIC
Diagnosis ProcedureINFOID:0000000005148063
1.CHECK CONNECTOR
1. Turn ignition switch OFF, disconnect the ABS actuat or and electric unit (control unit) connector, and check
the terminals for deformation, disconnection, looseness, and so on. If there is a malfunction, repair or
replace the terminal.
2. Reconnect connector and perform self-diagnosis. Refer to BRC-23, "
CONSULT-III Function (ABS)".
Is
“CAN COMM CIRCUIT” displayed in self-diagnosis display items?
YES >> Print out the self-diagnostic results, and refer to LAN-14, "Trouble Diagnosis Flow Chart".
NO >> Connector terminal is l oose, damaged, open, or shorted.
DTCDisplay item Malfunction detected condition Possible cause
U1000 CAN COMM CIRCUIT When ABS actuator and electric
unit (control unit) is not
transmitting or receiving CAN communication signal for 2
seconds or more. • CAN communication line
• ABS actuator and electric unit
(control unit)
Revision: April 20092010 QX56

BRC-80
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
VDC OFF SWITCH
VDC OFF SWITCH
DescriptionINFOID:0000000005148065
VDC OFF switch can deactivate (turn OFF) the VDC/TCS function by pressi
ng the VDC OFF switch.
Component Function CheckINFOID:0000000005148066
1.CHECK VDC OFF SWITCH OPERATION
Turn ON/OFF the VDC OFF switch and check that the VDC OFF indicator lamp in the combination meter turns
ON/OFF correctly.
Is the inspection result normal?
YES >> Inspection End
NO >> Go to diagnosis procedure. Refer to BRC-80, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000005148067
Regarding Wiring Diagram information, refer to BRC-92, "Wiring Diagram - BRAKE CONTROL SYSTEM -".
1.CHECK VDC OFF SWITCH
Perform the VDC OFF switch co mponent inspection. Refer to BRC-81, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 2
NO >> Replace VDC OFF switch.
2.CHECK VDC OFF SWITCH HARNESS
1. Disconnect ABS actuator and elec tric unit (control unit) connec-
tor.
2. Check continuity between ABS ac tuator and electric unit (control
unit) connector E125 (A) terminal 38 and VDC OFF switch con-
nector M253 (B) terminal 1.
3. Check continuity between ABS ac tuator and electric unit (control
unit) connector E125 (A) terminal 38 and ground.
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair or replace harness.
3.CHECK VDC OFF SWITCH GROUND
Condition VDC OFF indicator lamp illumination status
VDC OFF switch: ON ON
VDC OFF switch: OFF OFF
ABS actuator and electric unit
(control unit) VDC OFF switch
Continuity
Connector Terminal Connector Terminal
E125 (A) 38 M253 (B) 1Yes
ABS actuator and electric unit (control unit) —Continuity
Connector Terminal
E125 (A) 38Ground No
AWFIA0430ZZ
Revision: April 20092010 QX56

VDC OFF SWITCHBRC-81
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
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Check continuity between VDC OFF switch connector M253 terminal
2 and ground.
Is the inspection result normal?
YES >> GO TO 4
NO >> Repair or replace harness.
4.CHECK COMBINATION METER
Check if the indication and operation of combination meter are normal. Refer to MWI-22, "
Diagnosis Descrip-
tion".
Is the inspection result normal?
YES >> Replace ABS actuator and electric unit (control unit). Refer to BRC-116, "Removal and Installa-
tion".
NO >> Replace combination meter. Refer to MWI-100, "
Removal and Installation".
Component InspectionINFOID:0000000005148068
INSPECTION PROCEDURE
1.CHECK VDC OFF SWITCH
1. Turn ignition switch OFF.
2. Disconnect VDC OFF switch connector.
3. Check continuity between VDC OFF switch terminals.
Is the inspection result normal?
YES >> Inspection End
NO >> Replace VDC OFF switch.
Special Repair RequirementINFOID:0000000005194924
1.ADJUSTMENT OF STEERING AN GLE SENSOR NEUTRAL POSITION
Always perform neutral position adjustment for the st eering angle sensor when replacing the ABS actuator
and electric unit (control unit). Refer to BRC-8, "
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL
POSITION : Description".
>> GO TO 2
2.CALIBRATION OF DECEL G SENSOR
Always perform calibration of decel G sensor when replacing the ABS actuator and electric unit (control unit).
Refer to BRC-9, "
CALIBRATION OF DECEL G SENSOR : Description".
>> END
VDC OFF switch —Contin u it y
Connector Terminal
M253 2Ground Yes
AWFIA0031ZZ
VDC OFF switch
ConditionContinuity
Te r m i n a l
1 − 2 When VDC OFF switch is pressed. Yes
When VDC OFF switch is released. No
AWFIA0446ZZ
Revision: April 20092010 QX56

BRC-82
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
ABS WARNING LAMP
ABS WARNING LAMP
DescriptionINFOID:0000000005148069
×
: ON –: OFF
Component Function CheckINFOID:0000000005148070
1.CHECK ABS WARNING LAMP OPERATION
Check that the lamp illuminates for approximately 2 seconds after the ignition switch is turned ON.
Is the inspection result normal?
YES >> Inspection End
NO >> Go to diagnosis procedure. Refer to BRC-82, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000005148071
1.CHECK SELF-DIAGNOSIS
Perform ABS actuator and electric unit (control unit) self-diagnosis. Refer to BRC-23, "
CONSULT-III Function
(ABS)".
Is the inspection result normal?
YES >> GO TO 2
NO >> Check items displayed by self-diagnosis.
2.CHECK COMBINATION METER
Check if the indication and operation of combination meter are normal. Refer to MWI-22, "
Diagnosis Descrip-
tion".
Is the inspection result normal?
YES >> Replace ABS actuator and electr ic unit (control unit). Refer to BRC-116, "Removal and Installa-
tion".
NO >> Replace combination meter. Refer to MWI-100, "
Removal and Installation".
Special Repair RequirementINFOID:0000000005194925
1.ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION
Always perform neutral position adjustment for the st eering angle sensor when replacing the ABS actuator
and electric unit (control unit). Refer to BRC-8, "
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL
POSITION : Description".
>> GO TO 2
2.CALIBRATION OF DECEL G SENSOR
Always perform calibration of decel G sensor when replac ing the ABS actuator and electric unit (control unit).
Refer to BRC-9, "
CALIBRATION OF DECEL G SENSOR : Description".
>> END
Condition ABS warning lamp
Ignition switch OFF –
For 2 seconds after turning ON ignition switch ×
2 seconds later after turning ON ignition switch –
ABS function is malfunctioning. ×
EBD function is malfunctioning. ×
Revision: April 20092010 QX56

BRAKE WARNING LAMPBRC-83
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
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BRAKE WARNING LAMP
DescriptionINFOID:0000000005148072
× : ON –: OFF
NOTE:
• 1: Brake warning lamp will turn on in case of parking brake op eration (when switch is ON) or of brake fluid level switch operation
(when brake fluid is insufficient).
• 2: After starting engine, brake warning lamp is turned off.
Component Function CheckINFOID:0000000005148073
1.BRAKE WARNING LAMP OPERATION CHECK
Check that the lamp illuminates after the ignition switch is turned ON, and turns OFF after the engine is
started.
Is the inspection result normal?
YES >> Inspection End
NO >> Go to diagnosis procedure. Refer to BRC-83, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000005148074
1.CHECK SELF-DIAGNOSIS
Perform ABS actuator and electric unit (control unit) self-diagnosis. Refer to BRC-23, "
CONSULT-III Function
(ABS)".
Is the inspection result normal?
YES >> GO TO 2
NO >> Check items displayed by self-diagnosis.
2.CHECK COMBINATION METER
Check if the indication and operation of combination meter are normal. Refer to MWI-22, "
Diagnosis Descrip-
tion".
Is the inspection result normal?
YES >> Replace ABS actuator and electric unit (control unit). Refer to BRC-116, "Removal and Installa-
tion".
NO >> Replace combination meter. Refer to MWI-100, "
Removal and Installation".
Special Repair RequirementINFOID:0000000005194926
1.ADJUSTMENT OF STEERING AN GLE SENSOR NEUTRAL POSITION
Always perform neutral position adjustment for the st eering angle sensor when replacing the ABS actuator
and electric unit (control unit). Refer to BRC-8, "
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL
POSITION : Description".
>> GO TO 2
2.CALIBRATION OF DECEL G SENSOR
Always perform calibration of decel G sensor when replacing the ABS actuator and electric unit (control unit).
Refer to BRC-9, "
CALIBRATION OF DECEL G SENSOR : Description".
>> END
Condition Brake warning lamp (Note 1)
Ignition switch OFF –
Ignition switch ON × (Note 2)
EBD function is malfunctioning. ×
Revision: April 20092010 QX56

BRC-84
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
VDC OFF INDICATOR LAMP
VDC OFF INDICATOR LAMP
DescriptionINFOID:0000000005148075
×
: ON –: OFF
Component Function CheckINFOID:0000000005148076
1.VDC OFF INDICATOR LAMP OPERATION CHECK 1
Check that the lamp illuminates for approximately 2 seconds after the ignition switch is turned ON.
Is the inspection result normal?
YES >> GO TO 2
NO >> Go to diagnosis procedure. Refer to BRC-84, "
Diagnosis Procedure".
2.VDC OFF INDICATOR LAMP OPERATION CHECK 2
Check that the VDC OFF indicator lamp in the combination meter turns ON/OFF correctly when operating the
VDC OFF switch.
Is the inspection result normal?
YES >> Inspection End
NO >> Check VDC OFF switch. Refer to BRC-80, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000005148077
1.CHECK VDC OFF SWITCH
Check that the VDC OFF indicator lamp in the combination meter turns ON/OFF correctly when operating the
VDC OFF switch.
Is the inspection result normal?
YES >> GO TO 2
NO >> Check VDC OFF switch. Refer to BRC-80, "
Diagnosis Procedure".
2.CHECK SELF-DIAGNOSIS
Perform ABS actuator and electric unit (control unit) self-diagnosis. Refer to BRC-23, "
CONSULT-III Function
(ABS)".
Is the inspection result normal?
YES >> GO TO 3
NO >> Check items displayed by self-diagnosis.
3.CHECK COMBINATION METER
Check if the indication and operation of combination meter are normal. Refer to MWI-22, "
Diagnosis Descrip-
tion".
Is the inspection result normal?
YES >> Replace ABS actuator and electr ic unit (control unit). Refer to BRC-116, "Removal and Installa-
tion".
NO >> Replace combination meter. Refer to MWI-100, "
Removal and Installation".
Condition VDC OFF indicator lamp
Ignition switch OFF –
For 2 seconds after turning ON ignition switch ×
2 seconds later after turning ON ignition switch –
VDC OFF switch turned ON. (VDC function is OFF.) ×
VDC/TCS function is malfunctioning. ×
ABS function is malfunctioning. ×
EBD function is malfunctioning. ×
Revision: April 20092010 QX56

VDC OFF INDICATOR LAMPBRC-85
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
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Special Repair RequirementINFOID:0000000005194927
1.ADJUSTMENT OF STEERING AN GLE SENSOR NEUTRAL POSITION
Always perform neutral position adjustment for the st eering angle sensor when replacing the ABS actuator
and electric unit (control unit). Refer to BRC-8, "
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL
POSITION : Description".
>> GO TO 2
2.CALIBRATION OF DECEL G SENSOR
Always perform calibration of decel G sensor when replacing the ABS actuator and electric unit (control unit).
Refer to BRC-9, "
CALIBRATION OF DECEL G SENSOR : Description".
>> END
Revision: April 20092010 QX56

BRC-86
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
SLIP INDICATOR LAMP
SLIP INDICATOR LAMP
DescriptionINFOID:0000000005148078
×
: ON –: OFF
Component Function CheckINFOID:0000000005148079
1.CHECK SLIP INDICATOR LAMP OPERATION
Check that the lamp illuminates for approximately 2 seconds after the ignition switch is turned ON.
Is the inspection result normal?
YES >> Inspection End
NO >> Go to diagnosis procedure. Refer to BRC-86, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000005148080
1.CHECK SELF-DIAGNOSIS
Perform ABS actuator and electric unit (control unit) self-diagnosis. Refer to BRC-23, "
CONSULT-III Function
(ABS)".
Is the inspection result normal?
YES >> GO TO 2
NO >> Check items displayed by self-diagnosis.
2.CHECK COMBINATION METER
Check if the indication and operation of combination meter are normal. Refer to MWI-22, "
Diagnosis Descrip-
tion".
Is the inspection result normal?
YES >> Replace ABS actuator and electr ic unit (control unit). Refer to BRC-116, "Removal and Installa-
tion".
NO >> Replace combination meter. Refer to MWI-100, "
Removal and Installation".
Special Repair RequirementINFOID:0000000005194928
1.ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION
Always perform neutral position adjustment for the st eering angle sensor when replacing the ABS actuator
and electric unit (control unit). Refer to BRC-8, "
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL
POSITION : Description".
>> GO TO 2
2.CALIBRATION OF DECEL G SENSOR
Always perform calibration of decel G sensor when replac ing the ABS actuator and electric unit (control unit).
Refer to BRC-9, "
CALIBRATION OF DECEL G SENSOR : Description".
>> END
Condition SLIP indicator lamp
Ignition switch OFF –
For 2 seconds after turning ON ignition switch ×
2 seconds later after turning ON ignition switch –
VDC/TCS function is malfunctioning. ×
ABS function is malfunctioning. ×
EBD function is malfunctioning. ×
Revision: April 20092010 QX56

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)BRC-87
< ECU DIAGNOSIS > [VDC/TCS/ABS]
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ECU DIAGNOSIS
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Reference ValueINFOID:0000000005148081
VALUES ON THE DIAGNOSIS TOOL
CAUTION:
The display shows the control unit calculation data, so a normal value might be displayed even in the
event the output circuit (harness) is open or short-circuited.
CONSULT-III MONITOR ITEM
Monitor item Display content Data monitor
Condition Reference value in
normal operation
FR LH SENSOR Wheel speed 0 [km/h (MPH)]
Vehicle stopped
Nearly matches the speed meter display
(± 10% or less) Vehicle running
(Note 1)
FR RH SENSOR Wheel speed 0 [km/h (MPH)]
Vehicle stopped
Nearly matches the speed meter display
(± 10% or less) Vehicle running
(Note 1)
RR LH SENSOR Wheel speed 0 [km/h (MPH)]
Vehicle stopped
Nearly matches the speed meter display
(± 10% or less) Vehicle running
(Note 1)
RR RH SENSOR Wheel speed 0 [km/h (MPH)]
Vehicle stopped
Nearly matches the speed meter display
(± 10% or less) Vehicle running
(Note 1)
DECEL G-SEN Longitudinal acceleration detected by Decel
G-Sensor Vehicle stopped
Approx. 0 G
Vehicle running -1.7 to 1.7 G
FR RH IN SOL Operation status of each solenoid valve Actuator (solenoid valve) is active (“AC-
TIVE TEST” with CONSULT-III) or actua-
tor relay is inactive
(in fail-safe mode) ON
When the actuator (solenoid valve) is not
active and actuator relay is active (igni-
tion switch ON) OFF
FR RH OUT SOL Operation status of each solenoid valve Actuator (solenoid valve) is active (“AC-
TIVE TEST” with CONSULT-III) or actua-
tor relay is inactive
(in fail-safe mode) ON
When the actuator (solenoid valve) is not
active and actuator relay is active (igni-
tion switch ON) OFF
FR LH IN SOL Operation status of each solenoid valve Actuator (solenoid valve) is active (“AC-
TIVE TEST” with CONSULT-III) or actua-
tor relay is inactive
(in fail-safe mode) ON
When the actuator (solenoid valve) is not
active and actuator relay is active (igni-
tion switch ON) OFF
FR LH OUT SOL Operation status of each solenoid valve Actuator (solenoid valve) is active (“AC-
TIVE TEST” with CONSULT-III) or actua-
tor relay is inactive
(in fail-safe mode) ON
When the actuator (solenoid valve) is not
active and actuator relay is active (igni-
tion switch ON) OFF
Revision: April 20092010 QX56

BRC-88
< ECU DIAGNOSIS >[VDC/TCS/ABS]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
RR RH IN SOL Operation status of each solenoid valve Actuator (solenoid valve) is active (“AC-
TIVE TEST” with CONSULT-III) or actua-
tor relay is inactive (in fail-safe mode)
ON
When the actuator (solenoid valve) is not
active and actuator relay is active (igni-
tion switch ON) OFF
RR RH OUT SOL Operation status of each solenoid valve Actuator (solenoid valve) is active (“AC-
TIVE TEST” with CONSULT-III) or actua-
tor relay is inactive (in fail-safe mode)
ON
When the actuator (solenoid valve) is not
active and actuator relay is active (igni-
tion switch ON) OFF
RR LH IN SOL Operation status of each solenoid valve Actuator (solenoid valve) is active (“AC-
TIVE TEST” with CONSULT-III) or actua-
tor relay is inactive (in fail-safe mode)
ON
When the actuator (solenoid valve) is not
active and actuator relay is active (igni-
tion switch ON) OFF
RR LH OUT SOL Operation status of each solenoid valve Actuator (solenoid valve) is active (“AC-
TIVE TEST” with CONSULT-III) or actua-
tor relay is inactive (in fail-safe mode)
ON
When the actuator (solenoid valve) is not
active and actuator relay is active (igni-
tion switch ON) OFF
EBD WARN LAMP EBD warning lamp
(Note 2) When EBD warning lamp is ON
ON
When EBD warning lamp is OFF OFF
STOP LAMP SW Stop lamp switch signal status When brake pedal is depressed
ON
When brake pedal is released OFF
MOTOR RELAY Motor and motor relay operation When the motor relay and motor are op-
erating
ON
When the motor relay and motor are not
operating OFF
ACTUATOR RLY Actuator relay operation When the actuator relay is operating
ON
When the actuator relay is not operating OFF
ABS WARN LAMP ABS warning lamp
(Note 2) When ABS warning lamp is ON
ON
When ABS warning lamp is OFF OFF
OFF LAMP VDC OFF indicator lamp
(Note 2) When VDC OFF indicator lamp is ON
ON
When VDC OFF indicator lamp is OFF OFF
OFF SW VDC OFF switch ON/OFF VDC OFF switch ON
(When VDC OFF indicator lamp is ON)
ON
VDC OFF switch OFF
(When VDC OFF indicator lamp is OFF) OFF
SLIP LAMP SLIP indicator lamp
(Note 2) When SLIP indicator lamp is ON
ON
When SLIP indicator lamp is OFF OFF
BATTERY VOLT Battery voltage supplied to the ABS actuator
and electric unit (control unit) Ignition switch ON
10 – 16 V
GEAR Gear position determined by TCM 1st gear
2nd gear
3rd gear
4th gear
5th gear 1
2
3
4
5
Monitor item
Display content Data monitor
Condition Reference value in
normal operation
Revision: April 20092010 QX56