2008 INFINITI QX56 Factory Service Manual

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Page 529 of 4083

INFINITI QX56 2008 Factory Service Manual BRC-62
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
C1143, C1144 STEERING ANGLE SENSOR
3. Check continuity between steering angle sensor harness con-
nector terminal and ground.
4. Turn ignition switch ON.
5.

Page 530 of 4083

INFINITI QX56 2008 Factory Service Manual C1143, C1144 STEERING ANGLE SENSORBRC-63
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
Always perform neutral position adjustment for the st eering angle sensor when replacin

Page 531 of 4083

INFINITI QX56 2008 Factory Service Manual BRC-64
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
C1155 BRAKE FLUID LEVEL SWITCH
C1155 BRAKE FLUID LEVEL SWITCH
DescriptionINFOID:0000000001686321
The brake fluid level switch converts the brake fluid level

BRC-64
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
C1155 BRAKE FLUID LEVEL SWITCH
C1155 BRAKE FLUID LEVEL SWITCH
DescriptionINFOID:0000000001686321
The brake fluid level switch converts the brake fluid level to an electric signal and transmits it to the ABS actu-
ator and electric unit (control unit).
DTC LogicINFOID:0000000001686322
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK SELF-DIAGNOSIS RESULTS
Check the self-diagnosis results.
Is above displayed on the self-diagnosis display?
YES >> Proceed to diagnosis procedure. Refer to BRC-64, "Diagnosis Procedure".
NO >> Inspection End
Diagnosis ProcedureINFOID:0000000001686323
INSPECTION PROCEDURE
1.CONNECTOR INSPECTION
1. Disconnect ABS actuator and electric unit (control unit) connector E125 and brake fluid level switch con- nector E21.
2. Check the terminals for deformati on, disconnection, looseness or damage.
Is the inspection result normal?
YES >> GO TO 2
NO >> Repair or replace as necessary.
2.CHECK HARNESS BETWEEN BRAKE FLUID LEVE L SWITCH AND ABS ACTUATOR AND ELECTRIC
UNIT (CONTROL UNIT)
1. Check continuity between ABS actuator and electric unit (control
unit) harness connector E125 (A) and brake fluid level switch
harness connector E21 (B).
2. Check continuity between ABS ac tuator and electric unit (control
unit) harness connector E125 (A) and ground.
Is the inspection result normal?
DTC Display item Malfunction detected condition Possible cause
C1155 BR FLUID LEVEL LOW Brake fluid level is low or communication line between
the ABS actuator and electric unit (control unit) and brake
fluid level switch is open or shorted. • Harness or connector
• Brake fluid level switch
•Brake fluid level
Self-diagnosis results
BR FLUID LEVEL LOW
ABS actuator and electric unit (control unit) Brake fluid level switch
Continuity
Connector Terminal Connector Terminal
A: E125 8B: E21 1Yes
ABS actuator and electric unit (control unit) —Continuity
Connector Terminal
A: E125 8Ground No
AWFIA0025ZZ
Revision: March 2010 2008 QX56

Page 532 of 4083

INFINITI QX56 2008 Factory Service Manual C1155 BRAKE FLUID LEVEL SWITCHBRC-65
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
YES >> GO TO 3
NO >> Repair or replace malfunctioning components.
3.CHECK BRAKE FLUID LEVE

Page 533 of 4083

INFINITI QX56 2008 Factory Service Manual BRC-66
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
C1155 BRAKE FLUID LEVEL SWITCH
>> GO TO 2
2.CALIBRATION OF DECEL G SENSOR
Always perform calibration of decel G sensor when replac ing the ABS actuator and

Page 534 of 4083

INFINITI QX56 2008 Factory Service Manual C1156 ST ANG SEN COM CIRBRC-67
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
C1156 ST ANG SEN COM CIR
DescriptionINFOID:0000000001686326
The steering angle sensor is connecte

C1156 ST ANG SEN COM CIRBRC-67
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
C1156 ST ANG SEN COM CIR
DescriptionINFOID:0000000001686326
The steering angle sensor is connected to the ABS actuat or and electric unit (control unit) in addition to CAN
lines. CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle
multiplex communication line with high data communication speed and excellent error detection ability. Many
electronic 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:0000000001686327
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK SELF-DIAGNOSIS RESULTS
Check the self-diagnosis results.
Is above displayed on the self-diagnosis display?
YES >> Proceed to diagnosis procedure. Refer to BRC-67, "Diagnosis Procedure".
NO >> Inspection End
Diagnosis ProcedureINFOID:0000000001686328
INSPECTION PROCEDURE
1.CHECK CONNECTOR
1. Turn ignition switch OFF and disconnect ABS actuat or and electric unit (control unit) connector E125,
check terminal for deformation, disconnection, looseness, and so on. If any malfunction is found, repair or
replace terminal.
2. Reconnect connector and perform self-diagnosis.
Is above displayed on the self-diagnosis display?
YES >> Refer to LAN-14, "Trouble Diagnosis Flow Chart".
NO >> Inspection End
DTC Display item Malfunction detected condition Possible cause
C1156 ST ANG SEN COM CIR When steering angle sensor is not transmitting CAN
communication signal to th
e ABS actuator and electric
unit (control unit). • Harness or connector
• CAN communication line
• Steering angle sensor
• ABS actuator and electric unit
(control unit)
Self-diagnosis results
ST ANG SEN COM CIR
Self-diagnosis results
CAN COMM CIRCUIT
ST ANG SEN COM CIR
Revision: March 2010 2008 QX56

Page 535 of 4083

INFINITI QX56 2008 Factory Service Manual BRC-68
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
C1160 DECEL G SEN SET
C1160 DECEL G SEN SET
DescriptionINFOID:0000000001686329
The yaw rate/side/decel G sensor detects the yaw rate
/side/decel G affecting

Page 536 of 4083

INFINITI QX56 2008 Factory Service Manual C1163 ST ANGLE SEN SAFEBRC-69
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
C1163 ST ANGLE SEN SAFE
DescriptionINFOID:0000000001686332
The steering angle sensor detects the r

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