Infiniti QX56 (JA60). Manual — part 136
C1142 PRESS SENSOR
BRC-57
< COMPONENT DIAGNOSIS >
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
C1142 PRESS SENSOR
Description
INFOID:0000000005148018
The front and rear pressure sensors convert the brake fluid pressure to an electric signal and transmit it to the
ABS actuator and electric unit (control unit).
DTC Logic
INFOID:0000000005148019
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
.
NO
>> Inspection End
Diagnosis Procedure
INFOID:0000000005148020
Regarding Wiring Diagram information, refer to
BRC-92, "Wiring Diagram - BRAKE CONTROL SYSTEM -"
FRONT PRESSURE SENSOR
1.
CONNECTOR INSPECTION
1. Turn the ignition switch OFF.
2. Disconnect the front pressure sensor connector and ABS actuator and electric unit (control unit) connec-
tor and inspect the terminals for deformation, disconnection, looseness, or damage.
Is the inspection result normal?
YES
>> GO TO 2
NO
>> Repair connector.
2.
FRONT PRESSURE SENSOR CIRCUIT INSPECTION
1. Measure the continuity between the ABS actuator and electric
unit (control unit) connector E125 (A) and front pressure sensor
connector E31 (B).
DTC
Display item
Malfunction detected condition
Possible cause
C1142
PRESS SEN CIRCUIT
Pressure sensor signal line is open or shorted, or pres-
sure sensor is malfunctioning.
• Harness or connector
• Pressure sensor
• ABS actuator and electric unit
(control unit)
Self-diagnosis results
PRESS SEN CIRCUIT
ABS actuator and electric unit
(control unit)
Front pressure sensor
Continuity
Connector
Terminal
Connector
Terminal
A: E125
18
B: E31
3
Yes
19
1
20
2
AWFIA0021ZZ
BRC-58
< COMPONENT DIAGNOSIS >
[VDC/TCS/ABS]
C1142 PRESS SENSOR
2. Measure the continuity between the ABS actuator and electric unit (control unit) connector E125 (A) and
body ground.
Is the inspection result normal?
YES
>> GO TO 3
NO
>> Repair or replace harness or connector.
3.
FRONT PRESSURE SENSOR INSPECTION
1. Connect the front pressure sensor and ABS actuator and electric unit (control unit) connectors.
2. Perform the front pressure sensor component inspection. Refer to
BRC-59, "Component Inspection"
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Replace the front pressure sensor.
REAR PRESSURE SENSOR
1.
CONNECTOR INSPECTION
1. Turn the ignition switch OFF.
2. Disconnect the rear pressure sensor connector and ABS actuator and electric unit (control unit) connector
and inspect the terminals for deformation, disconnection, looseness, or damage.
Is the inspection result normal?
YES
>> GO TO 2
NO
>> Repair connector.
2.
REAR PRESSURE SENSOR CIRCUIT INSPECTION
1. Measure the continuity between the ABS actuator and electric
unit (control unit) connector E125 (A) and rear pressure sensor
connector E32 (B).
2. Measure the continuity between the ABS actuator and electric unit (control unit) connector E125 (A) and
body ground.
Is the inspection result normal?
YES
>> GO TO 3
NO
>> Repair or replace harness or connector.
ABS actuator and electric unit (control
unit)
—
Continuity
Connector
Terminal
A: E125
18
Ground
No
19
20
ABS actuator and electric unit
(control unit)
Rear pressure sensor
Continuity
Connector
Terminal
Connector
Terminal
A: E125
21
B: E32
1
Yes
22
3
23
2
ABS actuator and electric unit (control
unit)
—
Continuity
Connector
Terminal
A: E125
21
Ground
No
22
23
AWFIA0022ZZ
C1142 PRESS SENSOR
BRC-59
< COMPONENT DIAGNOSIS >
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
3.
REAR PRESSURE SENSOR INSPECTION
1. Connect the rear pressure sensor and ABS actuator and electric unit (control unit) connectors.
2. Perform the rear pressure sensor component inspection. Refer to
BRC-59, "Component Inspection"
.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Replace the rear pressure sensor.
Component Inspection
INFOID:0000000005148021
1.
CHECK DATA MONITOR
On “DATA MONITOR”, select “PRESS SENSOR” or “PRESS SEN2” and check the brake fluid pressure.
Is the inspection result normal?
YES
>> Inspection End
NO
>> Go to diagnosis procedure. Refer to
Condition
PRESS SENSOR or PRESS SEN2
(DATA MONITOR)
With ignition switch turned ON and brake pedal released.
Approx. 0 bar
With ignition switch turned ON and brake pedal depressed.
Positive value
BRC-60
< COMPONENT DIAGNOSIS >
[VDC/TCS/ABS]
C1143, C1144 STEERING ANGLE SENSOR
C1143, C1144 STEERING ANGLE SENSOR
Description
INFOID:0000000005148023
The steering angle sensor detects the rotation amount, angular velocity and direction of the steering wheel,
and transmits the data to the ABS actuator and electric unit (control unit) via CAN communication.
DTC Logic
INFOID:0000000005148024
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
.
NO
>> Inspection End
Diagnosis Procedure
INFOID:0000000005148025
Regarding Wiring Diagram information, refer to
BRC-92, "Wiring Diagram - BRAKE CONTROL SYSTEM -"
1.
CONNECTOR INSPECTION
1. Turn ignition switch OFF.
2. Disconnect ABS actuator and electric unit (control unit) connector.
3. Disconnect steering angle sensor connector.
4. Check terminal for deformation, disconnection, looseness, and so on. If any malfunction is found, repair or
replace terminal.
5. Reconnect connectors and then perform the self-diagnosis. Refer to
.
Is any item indicated on the self-diagnosis display?
YES
>> GO TO 2
NO
>> Poor connection of connector terminal. Repair or replace connector.
2.
CHECK STEERING ANGLE SENSOR HARNESS
1. Turn ignition switch OFF.
2. Disconnect steering angle sensor connector.
DTC
Display item
Malfunction detected condition
Possible cause
C1143
ST ANG SEN CIRCUIT
Neutral position of steering angle sensor is dislocated, or
the steering angle sensor is malfunctioning.
• Harness or connector
• Steering angle sensor
• ABS actuator and electric unit
(control unit)
C1144
ST ANG SEN SIGNAL
Neutral position of steering angle sensor is not finished.
Self-diagnosis results
ST ANG SEN CIRCUIT
ST ANG SEN SIGNAL
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