Infiniti QX56 (Z62). Manual — part 152
C1140 ACTUATOR RELAY SYSTEM
BRC-93
< DTC/CIRCUIT DIAGNOSIS >
[WITH VDC]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
C1140 ACTUATOR RELAY SYSTEM
DTC Logic
INFOID:0000000006222615
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
CHECK DTC DETECTION
With CONSULT-III.
1.
Turn the ignition switch OFF to ON.
2.
Perform self-diagnosis for “ABS”.
Is DTC “C1140” detected?
YES
>> Proceed to diagnosis procedure. Refer to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006222616
1.
CHECK ACTUATOR RELAY POWER SUPPLY
1.
Turn the ignition switch OFF.
2.
Disconnect ABS actuator and electric unit (control unit) harness connector.
3.
Check voltage between ABS actuator and electric unit (control unit) harness connector and ground.
4.
Turn the ignition switch ON.
CAUTION:
Never start engine.
5.
Check voltage between ABS actuator and electric unit (control unit) harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK ACTUATOR RELAY POWER SUPPLY CIRCUIT
1.
Turn the ignition switch OFF.
2.
Check 30A fusible link (L).
3.
Check continuity and short circuit between ABS actuator and electric unit (control unit) harness connector
terminal (1) and 30A fusible link (L).
Is the inspection result normal?
YES
>> Perform trouble diagnosis for battery power supply. Refer to
PG-11, "Wiring Diagram - BATTERY
NO
>> Repair or replace error-detected parts.
3.
CHECK ACTUATOR RELAY GROUND CIRCUIT
DTC
Display Item
Malfunction detected condition
Possible causes
C1140
ACTUATOR RLY
When a malfunction is detected in actuator relay.
• Harness or connector
• ABS actuator and electric unit
(control unit)
• Fusible link
• Battery power supply system
ABS actuator and electric unit (control unit)
—
Voltage
Connector
Terminal
E36
1
Ground
Battery voltage
ABS actuator and electric unit (control unit)
—
Voltage
Connector
Terminal
E36
1
Ground
Battery voltage
BRC-94
< DTC/CIRCUIT DIAGNOSIS >
[WITH VDC]
C1140 ACTUATOR RELAY SYSTEM
1.
Turn the ignition switch OFF.
2.
Check continuity between ABS actuator and electric unit (control unit) harness connector and the ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace error-detected parts.
4.
CHECK TERMINAL
Check ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with harness
connector.
Is the inspection result normal?
YES
>> Replace ABS actuator and electric unit (control unit). Refer to
BRC-137, "Removal and Installa-
.
NO
>> Repair or replace error-detected parts.
ABS actuator and electric unit (control unit)
—
Continuity
Connector
Terminal
E36
2
Ground
Existed
3
E37
48
C1142 PRESS SENSOR
BRC-95
< DTC/CIRCUIT DIAGNOSIS >
[WITH VDC]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
C1142 PRESS SENSOR
DTC Logic
INFOID:0000000006222617
DTC DETECTION LOGIC
*: Models with Advanced Driver Assistance System
DTC CONFIRMATION PROCEDURE
1.
CHECK DTC DETECTION
With CONSULT-III.
1.
Turn the ignition switch OFF to ON.
2.
Perform self-diagnosis for “ABS”.
Is DTC “C1142” detected?
YES
>> Proceed to diagnosis procedure. Refer to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006222618
1.
CHECK STOP LAMP SWITCH SUSTEM
Check stop lamp switch system. Refer to
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace error-detected parts.
2.
CHECK BRAKE FLUID LEACKAGE
Check brake fluid leakage. Refer to
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace error-detected parts.
3.
CHECK BRAKE PIPING
Check brake piping. Refer to
(rear).
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace error-detected parts.
4.
CHECK BRAKE PEDAL
Check brake pedal. Refer to
BR-21, "Inspection and Adjustment"
.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace error-detected parts.
5.
CHECK HYDRAULIC BOOSTER ASSEMBLY
Check hydraulic booster assembly. Refer to
BR-32, "Inspection and Adjustment"
.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace error-detected parts.
6.
CHECK FRONT DISC BRAKE
Check front disc brake. Refer to
BR-39, "BRAKE CALIPER ASSEMBLY : Inspection"
DTC
Display Item
Malfunction detected condition
Possible causes
C1142
PRESS SEN CIRCUIT
When a malfunction is detected in master cylinder
pressure sensor or control pressure sensor
*
.
• Stop lamp switch system
• ABS actuator and electric unit
(control unit)
• Brake system
BRC-96
< DTC/CIRCUIT DIAGNOSIS >
[WITH VDC]
C1142 PRESS SENSOR
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair or replace error-detected parts.
7.
CHECK REAR DISC BRAKE
Check rear disc brake. Refer to
BR-45, "BRAKE CALIPER ASSEMBLY : Inspection"
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair or replace error-detected parts.
8.
CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
With CONSULT-III.
1.
Erase Self-diagnosis result for “ABS”.
2.
Start the engine and drive the vehicle for a short period of time.
3.
Perform self-diagnosis for “ABS”.
Is DTC “C1142” detected?
YES
>> Replace ABS actuator and electric unit (control unit). Refer to
BRC-137, "Removal and Installa-
NO
>> Check ABS actuator and electric unit (control unit) harness connector and terminal for damage,
looseness and disconnection. Repair or replace error-detected parts.
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