Infiniti QX56 (Z62). Manual - part 157

POWER SUPPLY AND GROUND CIRCUIT

BRC-113

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

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M

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BRC

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POWER SUPPLY AND GROUND CIRCUIT

Description

INFOID:0000000006222641

ABS actuator and electric unit (control unit) power supply

Diagnosis Procedure

INFOID:0000000006222642

1.

CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) IGNITION POWER SUPPLY (1)

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

(1)

1.

Turn the ignition switch OFF.

2.

Check 10A fuse (#57).

3.

Disconnect IPDM E/R harness connector.

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.

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

ABS actuator and electric unit (control unit)

—

Voltage

Connector

Terminal

E36

18

Ground

Approx. 0 V

ABS actuator and electric unit (control unit)

—

Voltage

Connector

Terminal

E36

18

Ground

10 

−

 16 V

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

BRC-114

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

POWER SUPPLY AND GROUND CIRCUIT

2.

Turn the ignition switch ON

CAUTION:

Never start engine.

3.

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 MOTOR AND MOTOR RELAY POWER SUPPLY CIRCUIT

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 7.

NO

>> GO TO 6.

6.

CHECK MOTOR AND MOTOR RELAY POWER SUPPLY CIRCUIT

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 and 47) and 50A fusible link (M).

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

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

POWER SUPPLY AND GROUND CIRCUIT

BRC-115

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

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.

7.

CHECK ACTUATOR RELAY, ABS IN VALVE, ABS OUT VALVE, ANS CUT VALVE, SUCTION VALVE POW-

ER SUPPLY

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 9.

NO

>> GO TO 8.

8.

CHECK ACTUATOR RELAY, ABS IN VALVE, ABS OUT VALVE, ANS CUT VALVE, SUCTION VALVE POW-

ER 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

POWER SUPPLY -"

.

NO

>> Repair or replace error-detected parts.

9.

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

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

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Repair or replace error-detected parts.

10.

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

>> INSPECTION END

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

ABS actuator and electric unit (control unit)

—

Continuity

Connector

Terminal

E36

2

Ground

Existed

3

E37

48

BRC-116

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

POWER SUPPLY AND GROUND CIRCUIT

NO

>> Repair or replace error-detected parts.