Infiniti QX56 (Z62). Manual - part 147

C1109 POWER AND GROUND SYSTEM

BRC-73

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

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4.

Check continuity between ABS actuator and electric unit (control unit) harness connector and IPDM E/R
harness connector.

5.

Check for continuity between ABS actuator and electric unit (control unit) harness connector and the
ground.

Is the inspection result normal?

YES

>> Perform trouble diagnosis for ignition power supply. Refer to 

PG-89, "Wiring Diagram - IGNITION

POWER SUPPLY -"

.

NO

>> Repair or replace error-detected parts.

3.

CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) IGNITION POWER SUPPLY (2)

1.

Turn the ignition switch OFF.

2.

Check voltage between ABS actuator and electric unit (control unit) harness connector and ground.

3.

Turn the ignition switch ON.

CAUTION:

Never start engine.

4.

Check voltage between ABS actuator and electric unit (control unit) harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) IGNITION POWER SUPPLY CIRCUIT

(2)

1.

Turn the ignition switch OFF.

2.

Check 10A fuse (#74).

3.

Check continuity and short circuit between ABS actuator and electric unit (control unit) harness connector
terminal (49) and 10A fuse (#74).

Is the inspection result normal?

YES

>> Perform trouble diagnosis for ignition power supply. Refer to 

PG-89, "Wiring Diagram - IGNITION

POWER SUPPLY -"

.

NO

>> Repair or replace error-detected parts.

5.

CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) GROUND CIRCUIT

1.

Turn the ignition switch OFF.

2.

Check continuity between ABS actuator and electric unit (control unit) harness connector and ground.

ABS actuator and electric unit (control unit)

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

E36

18

E15

59

Existed

ABS actuator and electric unit (control unit)

—

Continuity

Connector

Terminal

E36

18

Ground

Not existed

ABS actuator and electric unit (control unit)

—

Voltage

Connector

Terminal

E37

49

Ground

Approx. 0 V

ABS actuator and electric unit (control unit)

—

Voltage

Connector

Terminal

E37

49

Ground

10 

−

 16 V

BRC-74

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

C1109 POWER AND GROUND SYSTEM

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace error-detected parts.

6.

CHECK TERMINAL

• Check ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with har-

ness connector.

• Check IPDM E/R 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-

tion"

.

NO

>> Repair or replace error-detected parts.

ABS actuator and electric unit (control unit)

—

Continuity

Connector

Terminal

E36

2

Ground

Existed

3

E37

48

C1111 PUMP MOTOR

BRC-75

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

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C1111 PUMP MOTOR

DTC Logic

INFOID:0000000006222599

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

CHECK DTC DETECTION

With CONSULT-III.

1.

Turn the ignition switch OFF and depress the brake pedal 20 times or more.

2.

Start the engine and wait for 3 minutes or more.

CAUTION:

Never drive the vehicle.

3.

Depress the brake pedal, and then operate the ABS actuator and electric unit (control unit) motor repeats
ON and OFF 4 times or more.

CAUTION:

Never drive the vehicle.

4.

Perform self-diagnosis for “ABS”.

Is DTC “C1111” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

BRC-75, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006222600

1.

CHECK ABS MOTOR AND MOTOR 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 ABS MOTOR AND MOTOR RELAY POWER SUPPLY CIRCUIT

DTC

Display Item

Malfunction detected condition

Possible causes

C1111

PUMP MOTOR

• When a malfunction is detected in motor or motor 

relay.

• When a low pressure malfunction is detected in ac-

cumulator.

• When a malfunction is detected in accumulator 

pressure sensor.

• Harness or connector
• ABS actuator and electric unit 

(control unit)

• Fusible  link
• Battery power supply system
• Motor/accumulator assembly

ABS actuator and electric unit (control unit)

—

Voltage

Connector

Terminal

E36

4

Ground

Battery voltage

E37

47

ABS actuator and electric unit (control unit)

—

Voltage

Connector

Terminal

E36

4

Ground

Battery voltage

E37

47

BRC-76

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

C1111 PUMP MOTOR

1.

Turn the ignition switch OFF.

2.

Check 50A fusible link (M).

3.

Check continuity and short circuit between ABS actuator and electric unit (control unit) harness connector
terminal (4 or 47) and 50A fusible link (M).

Is the inspection result normal?

YES

>> Perform trouble diagnosis for battery power supply. Refer to 

PG-11, "Wiring Diagram - BATTERY

POWER SUPPLY -"

.

NO

>> Repair or replace error-detected parts.

3.

CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) GROUND CIRCUIT

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 MOTOR/ACCUMULATOR ASSEMBLY

Check motor/accumulator assembly. Refer to 

BR-15, "Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace motor/accumulator assembly. Refer to 

BR-29, "Removal and Installation"

 and 

BR-30,

"Disassembly and Assembly"

.

5.

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-

tion"

.

NO

>> Repair or replace error-detected parts.

ABS actuator and electric unit (control unit)

—

Continuity

Connector

Terminal

E36

2

Ground

Existed

3

E37

48