INFINITI QX56 2008 Factory Service Manual

BRC-84
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
BRAKE WARNING LAMP
BRAKE WARNING LAMP
DescriptionINFOID:0000000001686361
×
: ON –: OFF
NOTE:
• 1: Brake warning lamp will turn on in case of parking brake operation (when switch is ON) or of brake fluid level switch opera tion
(when brake fluid is insufficient).
• 2: After starting engine, brake warning lamp is turned off.
Component Function CheckINFOID:0000000001686362
1.BRAKE WARNING LAMP OPERATION CHECK
Check that the lamp illuminates for approximately 1 second after the ignition switch is turned ON.
Is the inspection result normal?
YES >> Inspection End
NO >> Go to diagnosis procedure. Refer to BRC-84, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001691169
1.CHECK SELF-DIAGNOSIS
Perform ABS actuator and electric unit (control unit) self-diagnosis. Refer to BRC-24, "
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-24, "
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-76, "
Removal and Installation".
Condition Brake warning lamp (Note 1)
Ignition switch OFF –
For 1 second after turning ON ignition switch × (Note 2)
1 second later after turning ON ignition switch × (Note 2)
EBD function is malfunctioning. ×
Revision: March 2010 2008 QX56

VDC OFF INDICATOR LAMPBRC-85
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
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VDC OFF INDICATOR LAMP
DescriptionINFOID:0000000001686364
× : ON –: OFF
Component Function CheckINFOID:0000000001686365
1.VDC OFF INDICATOR LAMP OPERATION CHECK 1
Check that the lamp illuminates for approximately 1 second after the ignition switch is turned ON.
Is the inspection result normal?
YES >> GO TO 2
NO >> Go to diagnosis procedure. Refer to BRC-85, "
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-81, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001686366
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-81, "
Diagnosis Procedure".
2.CHECK SELF-DIAGNOSIS
Perform ABS actuator and electric unit (control unit) self-diagnosis. Refer to BRC-24, "
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-24, "
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-76, "
Removal and Installation".
Condition VDC OFF indicator lamp
Ignition switch OFF –
For 1 second after turning ON ignition switch ×
1 second 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: March 2010 2008 QX56

BRC-86
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
SLIP INDICATOR LAMP
SLIP INDICATOR LAMP
DescriptionINFOID:0000000001686367
×
: ON –: OFF
Component Function CheckINFOID:0000000001686368
1.CHECK SLIP INDICATOR LAMP OPERATION
Check that the lamp illuminates for approximately 1 second 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:0000000001691170
1.CHECK SELF-DIAGNOSIS
Perform ABS actuator and electric unit (control unit) self-diagnosis. Refer to BRC-24, "
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-24, "
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-76, "
Removal and Installation".
Condition SLIP indicator lamp
Ignition switch OFF –
For 1 second after turning ON ignition switch ×
1 second later after turning ON ignition switch –
VDC/TCS function is malfunctioning. ×
ABS function is malfunctioning. ×
EBD function is malfunctioning. ×
Revision: March 2010 2008 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:0000000001686370
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)
STOP LAMP SW Stop lamp switch signal status When brake pedal is depressed
ON
When brake pedal is released 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
SLCT LVR POSI A/T selector lever position P position
R position
N position
D positionP
R
N
D
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
YAW RATE SEN Yaw rate detected by yaw rate/side/decel G
sensor When vehicle is stopped
Approx. 0 d/s
When vehicle turning −75 to 75 d/s
ACCEL POS SIG Throttle actuator opening/closing is dis-
played (linked with accelerator pedal) Accelerator pedal not depressed (ignition
switch is ON)
0 %
Accelerator pedal depressed (ignition
switch is ON) 0 - 100 %
Revision: March 2010
2008 QX56

BRC-88
< ECU DIAGNOSIS >[VDC/TCS/ABS]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
SIDE G-SENSOR Transverse G detected by side G sensorVehicle stopped
Approx. 0 m/s
2
Vehicle turning rightNegative value
(m/s2)
Vehicle turning left Positive value
(m/s
2)
STR ANGLE SIG Steering angle detected by steering angle
sensor Straight-ahead
Approx. 0±2.5°
Steering wheel turned –720 to +720°
PRESS SENSOR Brake fluid pressure detected by front pres-
sure sensor With ignition switch turned ON and brake
pedal released
Approx. 0 bar
With ignition switch turned ON and brake
pedal depressed –40 to 300 bar
ENGINE SPEED With engine running With engine stopped
0 rpm
Engine running Almost in accor-
dance with tachome-
ter display
FLUID LEV SW Brake fluid level switch signal status When brake fluid level switch ON
ON
When brake fluid level switch OFF OFF
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
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
Monitor item
Display content Data monitor
Condition Reference value in
normal operation
Revision: March 2010 2008 QX56

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)BRC-89
< ECU DIAGNOSIS > [VDC/TCS/ABS]
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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
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 3) When ABS warning lamp is ON
ON
When ABS warning lamp is OFF OFF
OFF LAMP VDC OFF indicator lamp
(Note 3) When VDC OFF indicator lamp is ON
ON
When VDC OFF indicator lamp is OFF OFF
SLIP LAMP SLIP indicator lamp
(Note 3) When SLIP indicator lamp is ON
ON
When SLIP indicator lamp is OFF OFF
4WD FAIL REQ
(Note 2) Transfer control unit fail-safe signal When transfer control unit is in fail-safe
mode
ON
When transfer control unit is normal OFF
BST OPER SIG Active booster operation Active booster is active
ON
Active booster is inactive OFF
EBD SIGNAL EBD operation EBD is active
ON
EBD is inactive OFF
ABS SIGNAL ABS operation ABS is active
ON
ABS is inactive OFF
TCS SIGNAL TCS operation TCS is active
ON
TCS is inactive OFF
VDC SIGNAL VDC operation VDC is active
ON
VDC is inactive OFF
EBD FAIL SIG EBD fail-safe signal In EBD fail-safe
ON
EBD is normal OFF
ABS FAIL SIG ABS fail-safe signal In ABS fail-safe
ON
ABS is normal OFF
Monitor item
Display content Data monitor
Condition Reference value in
normal operation
Revision: March 2010 2008 QX56

BRC-90
< ECU DIAGNOSIS >[VDC/TCS/ABS]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
TCS FAIL SIG TCS fail-safe signalIn TCS fail-safe ON
TCS is normal
OFF
VDC FAIL SIG VDC fail-safe signal In VDC fail-safe
ON
VDC is normal OFF
CRANKING SIG Crank operation Crank is active
ON
Crank is inactive OFF
CV1 VDC switch-over valve When actuator (switch-over valve) is ac-
tive (“ACTIVE TEST” with CONSULT-III)
or actuator relay is inactive (when in fail-
safe mode)
ON
When actuator (switch-over valve) is not
active and actuator relay is active (igni-
tion switch ON) OFF
CV2 VDC switch-over valve When actuator (switch-over valve) is ac-
tive (“ACTIVE TEST” with CONSULT-III)
or actuator relay is inactive (when in fail-
safe mode)
ON
When actuator (switch-over valve) is not
active and actuator relay is active (igni-
tion switch ON) OFF
SV1 VDC switch-over valve When actuator (switch-over valve) is ac-
tive (“ACTIVE TEST” with CONSULT-III)
or actuator relay is inactive (when in fail-
safe mode)
ON
When actuator (switch-over valve) is not
active and actuator relay is active (igni-
tion switch ON) OFF
SV2 VDC switch-over valve When actuator (switch-over valve) is ac-
tive (“ACTIVE TEST” with CONSULT-III)
or actuator relay is inactive (when in fail-
safe mode)
ON
When actuator (switch-over valve) is not
active and actuator relay is active (igni-
tion switch ON) OFF
DECEL G-SEN Longitudinal acceleration detected by Decel
G-Sensor Vehicle stopped
Approx. 0 G
Vehicle running -1.7 to 1.7 G
EBD WARN LAMP EBD warning lamp
(Note 3) When EBD warning lamp is ON
ON
When EBD warning lamp is OFF OFF
N POSI SIG Transmission range switch signal ON/OFF
condition A/T shift position = N position
ON
A/T shift position = other than N position OFF
P POSI SIG Transmission range switch signal ON/OFF
condition A/T shift position = P position
ON
A/T shift position = other than P position OFF
R POSI SIG Transmission range switch signal ON/OFF
condition A/T shift position = R position
ON
A/T shift position = other than R position OFF
2WD/4WD Drive axle 2WD model
2WD
4WD model 4WD
PRESS SEN2 Brake fluid pressure detected by rear pres-
sure sensor With ignition switch turned ON and brake
pedal released
Approx. 0 bar
With ignition switch turned ON and brake
pedal depressed –40 to 300 bar
Monitor item
Display content Data monitor
Condition Reference value in
normal operation
Revision: March 2010 2008 QX56

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)BRC-91
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NOTE:
• 1: Confirm tire pr essure is normal.
• 2: Only 4WD models.
• 3: On and off timing for warning lamp and indicator lamp.
- ABS warning lamp: Refer to BRC-83, "
Description".
- Brake warning lamp: Refer to BRC-84, "
Description".
- VDC OFF indicator lamp: Refer to BRC-85, "
Description".
- SLIP indicator lamp: Refer to BRC-86, "
Description".
TERMINAL LAYOUT
DELTA S SEN Value detected by delta stroke sensor When brake pedal is depressed 1.05 - 1.80 mm
When brake pedal is released
0.00 mm (+0.6/-0.4)
RELEASE SWITCH
NO Active booster signal status When brake pedal is depressed
ON
When brake pedal is released OFF
RELEASE SWITCH
NC Active booster signal status When brake pedal is depressed
OFF
When brake pedal is released ON
STP OFF RLY Stop lamp relay signal When stop lamp relay is ON
ON
When stop lamp relay is OFF OFF
PRES CTRL ACC This item is not used for this model. ——
PRES FAIL ACC This item is not used for this model. ——
Monitor item
Display content Data monitor
Condition Reference value in
normal operation
AWFIA0032ZZ
Revision: March 2010 2008 QX56

BRC-92
< ECU DIAGNOSIS >[VDC/TCS/ABS]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Wiring Diagram
INFOID:0000000001686371
ABFWA0155GB
Revision: March 2010 2008 QX56

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)BRC-93
< ECU DIAGNOSIS > [VDC/TCS/ABS]
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ABFWA0156GB
Revision: March 2010 2008 QX56