2007 INFINITI QX56 Factory Service Manual

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Page 969 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
BRC-41
< SERVICE INFORMATION >[VDC/TCS/ABS]
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Check the voltage between the ABS actuator and electric unit (con-
trol unit) h

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
BRC-41
< SERVICE INFORMATION >[VDC/TCS/ABS]
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Check the voltage between the ABS actuator and electric unit (con-
trol unit) harness connector E125 terminal 41 and body ground.
OK or NG
OK >> Perform self-diagnosis again. If the same results
appear, replace ABS actuator and electric unit (control
unit). Refer to BRC-58, "
Removal and Installation".
NG >> GO TO 4.
4.STOP LAMP RELAY CIRCUIT INSPECTION
1. Disconnect the stop lamp relay harness connector E12.
2. Check the continuity between the ABS actuator and electric unit
(control unit) harness connector E125 (B) terminal 41 and stop
lamp relay harness connector E12 (A) terminal 4.
OK or NG
OK >> Perform self-diagnosis again. If the same results
appear, replace ABS actuator and electric unit (control
unit). Refer to BRC-58, "
Removal and Installation"BRC-
58, "Removal and Installation".
NG >> Refer to "Stop Lamp Switch System Inspection".
ABS/TCS/VDC Control Unit Power and Ground Systems InspectionINFOID:0000000003532792
INSPECTION PROCEDURE
1.SELF-DIAGNOSIS RESULT CHECK
Check self-diagnosis results.
Is the above displayed in the self-diagnosis display items?
YES >> GO TO 2.
NO >> Inspection End.
2.CONNECTOR INSPECTION
1. Disconnect the ABS actuator and electric unit (control unit) connector E125.
2. Check the terminals for deformation, disconnection, looseness or damage.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace as necessary.
3.ABS/TCS/VDC CONTROL UNIT POWER AND GROUND CIRCUIT INSPECTION
Measure the voltage and continuity between the ABS actuator and electric unit (control unit) harness connec-
tor E125 and body ground.Brake pedal depressed : Battery voltage
(approx. 12V)
Brake pedal not depressed : Approx. 0V
WFIA0198E
Continuity should exist
WFIA0431E
Self-diagnosis results
BATTERY VOLTAGE
Signal nameABS actuator and electric unit
(control unit) connector E125Body
groundMeasured value
Power supply1
— Battery voltage (Approx. 12V)
32

Page 970 of 3061

INFINITI QX56 2007 Factory Service Manual BRC-42
< SERVICE INFORMATION >[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
OK or NG
OK >> Check the battery for loose terminals, low voltage, etc. Repair as necessary.
NG >> Repair the ci

Page 971 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
BRC-43
< SERVICE INFORMATION >[VDC/TCS/ABS]
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Active Booster System InspectionINFOID:0000000003532794
INSPECTION PROCEDURE
1.

Page 972 of 3061

INFINITI QX56 2007 Factory Service Manual BRC-44
< SERVICE INFORMATION >[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
4.ACTIVE BOOSTER SENSOR INSPECTION
1. Reconnect the active booster and ABS actuator and electric unit (control u

Page 973 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
BRC-45
< SERVICE INFORMATION >[VDC/TCS/ABS]
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OK or NG
OK >> GO TO 4.
NG >> Repair or replace harness or connector.
4.DELTA S

Page 974 of 3061

INFINITI QX56 2007 Factory Service Manual BRC-46
< SERVICE INFORMATION >[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
OK or NG
OK >> GO TO 4.
NG >> Repair or replace harness or connector.
4.FRONT PRESSURE SENSOR INSPECTION
1. Reco

Page 975 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
BRC-47
< SERVICE INFORMATION >[VDC/TCS/ABS]
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2. Measure the continuity between the ABS actuator and electric unit (control u

Page 976 of 3061

INFINITI QX56 2007 Factory Service Manual BRC-48
< SERVICE INFORMATION >[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
When self-diagnostic results show items other than those above, perform repair or replacement for the item
indic

BRC-48
< SERVICE INFORMATION >[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
When self-diagnostic results show items other than those above, perform repair or replacement for the item
indicated and repeat self-diagnosis.
Is the above displayed on self-diagnosis display?
YES >> Erase error memory.
NO >> Inspection End.
CAN Communication System InspectionINFOID:0000000003532798
INSPECTION PROCEDURE
1.CHECK CONNECTOR
1. Turn ignition switch OFF, disconnect the ABS actuator 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 to perform self-diagnosis.
Is "CAN COMM CIRCUIT" displayed in self-diagnosis display items?
YES >> Print out the self-diagnostic results, and refer to LAN-7.
NO >> Connector terminal is loose, damaged, open, or shorted.
ICC System InspectionINFOID:0000000003532799
INSPECTION PROCEDURE
1.SELF-DIAGNOSIS RESULT CHECK
Perform self-diagnosis of ICC control unit. Refer to ACS-30, "
Self-Diagnostic Function".
Are self-diagnosis result items displayed?
YES >> After checking and repairing the applicable item, perform ICC control unit self-diagnosis again.
NO >> GO TO 2.
2.CONNECTOR INSPECTION
Disconnect the ABS actuator and electric unit (control unit) connector and the ICC control unit connector and
check the terminals for deformation, disconnection, looseness or damage.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace as necessary.
3.ICC CONTROL UNIT CIRCUIT INSPECTION
1. Measure the continuity between ABS actuator and electric unit (control unit) connector E125 and ICC con-
trol unit connector B13.
2. Measure the continuity between ABS actuator and electric unit (control unit) connector E125 and body
ground.
OK or NG
OK >> Replace ABS actuator and electric unit (control unit). Refer to BRC-58, "Removal and Installation"
NG >> Repair or replace harness or connector.
Inspection for Self-Diagnosis Result "ST ANG SEN SIGNAL"INFOID:0000000003532800
INSPECTION PROCEDURE
ABS actuator and electric unit (con-
trol unit) connector E125ICC control unit connector
B13Continuity
710Yes
ABS actuator and electric unit (con-
trol unit) connector E125Body ground Continuity
7—No

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