INFINITI QX56 2010 Factory Service Manual

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)BRC-89
< ECU DIAGNOSIS > [VDC/TCS/ABS]
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SLCT LVR POSI A/T selector lever position P position
R position
N position
D positionP
R
N
D
ENGINE SPEED With engine running With engine stopped
0 rpm
Engine running Almost in accor-
dance with tachome-
ter display
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
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
4WD FAIL REQ
(Note 3) Transfer control unit fail-safe signal When transfer control unit is in fail-safe
mode
ON
When transfer control unit is normal 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
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
2WD/4WD Drive axle 2WD model
2WD
4WD model 4WD
Monitor item
Display content Data monitor
Condition Reference value in
normal operation
Revision: April 20092010 QX56

BRC-90
< ECU DIAGNOSIS >[VDC/TCS/ABS]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
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 %
SIDE G-SENSOR Transverse G detected by side G sensor Vehicle 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°
Steering wheel turned –720 to 720°
BST OPER SIG Active booster operation Active booster is active
ON
Active booster is inactive OFF
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
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
TCS FAIL SIG TCS fail-safe signal In 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
FLUID LEV SW Brake fluid level switch signal status When brake fluid level switch ON
ON
When brake fluid level switch OFF OFF
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
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 SW NO Active booster signal status When brake pedal is depressed
ON
When brake pedal is released OFF
Monitor item
Display content Data monitor
Condition Reference value in
normal operation
Revision: April 20092010 QX56

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)BRC-91
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NOTE:
• 1: Confirm tire pr essure is normal.
• 2: On and off timing for warning lamp and indicator lamp.
• 3: Only 4WD models.
- ABS warning lamp: Refer to BRC-82, "
Description".
- Brake warning lamp: Refer to BRC-83, "
Description".
- VDC OFF indicator lamp: Refer to BRC-84, "
Description".
- SLIP indicator lamp: Refer to BRC-86, "
Description".
TERMINAL LAYOUT
RELEASE SW NC Active booster signal status When brake pedal is depressed OFF
When brake pedal is released
ON
OHB FAIL OHB fail safe signal OHB is active
ON
OHB is inactive OFF
HBA FAIL HBA fail safe signal HBA is active
ON
HBA is inactive OFF
OHB SIG OHB operation In OHB fail-safe
ON
OHB is normal OFF
HBA SIG HBA operation In HBA fail-safe
ON
HBA is normal OFF
STP OFF RLY Stop lamp relay signal When stop lamp relay is ON
ON
When stop lamp relay is OFF OFF
Monitor item
Display content Data monitor
Condition Reference value in
normal operation
AWFIA0032ZZ
Revision: April 20092010 QX56

BRC-92
< ECU DIAGNOSIS >[VDC/TCS/ABS]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Wiring Diagram - BRAKE CONTROL SYSTEM -
INFOID:0000000005148082
ABFWA0081GB
Revision: April 20092010 QX56

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)BRC-93
< ECU DIAGNOSIS > [VDC/TCS/ABS]
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ABFWA0082GB
Revision: April 20092010 QX56

BRC-94
< ECU DIAGNOSIS >[VDC/TCS/ABS]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
ABFIA0220GB
Revision: April 20092010 QX56

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)BRC-95
< ECU DIAGNOSIS > [VDC/TCS/ABS]
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ABFIA0221GB
Revision: April 20092010 QX56

BRC-96
< ECU DIAGNOSIS >[VDC/TCS/ABS]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
ABFIA0017GB
Revision: April 20092010 QX56

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)BRC-97
< ECU DIAGNOSIS > [VDC/TCS/ABS]
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ABFIA0222GB
Revision: April 20092010 QX56

BRC-98
< ECU DIAGNOSIS >[VDC/TCS/ABS]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
ABFIA0223GB
Revision: April 20092010 QX56