Infiniti QX56 (Z62). Manual - part 468

DLN-72

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ATX90A]

P181A TRANSFER MOTOR TEMPERATURE SENSOR

P181A TRANSFER MOTOR TEMPERATURE SENSOR

DTC Logic

INFOID:0000000006222271

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Start the engine and drive at 40 km/h (25 MPH) or more for approximately 1minute.

2.

Perform self-diagnosis for “ALL MODE AWD/4WD”.

Is DTC “P181A” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-72, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006222272

1.

CHECK TRANSFER MOTOR TEMPERATURE SENSOR POWER SUPPLY

1.

Turn the ignition switch OFF.

2.

Disconnect transfer control actuator harness connector.

3.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

4.

Check the voltage between transfer control actuator harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK TRANSFER MOTOR TEMPERATURE SENSOR CIRCUIT

1.

Turn the ignition switch OFF.

2.

Disconnect transfer control unit harness connector.

3.

Check the continuity between transfer control unit harness connector and transfer control actuator har-
ness connector.

4.

Check the continuity between transfer control actuator harness connector and ground.

DTC

Display item

Malfunction detected condition

Possible cause

P181A

MOTOR TEMP SEN

When vehicle speed is 40km/h or more 
and transfer motor temperature is lower 
than normal

Transfer control actuator
• Malfunction of transfer motor temper-

ature sensor circuit. (open)

When transfer motor temperature is 
higher than normal

Transfer control actuator
• Malfunction of transfer motor temper-

ature sensor circuit. (short)

+

−

Voltage

Transfer control actuator

Connector

Terminal

F52

4

7

Approx. 5 V

Transfer control unit

Transfer control actuator

Continuity

Connector

Terminal

Connector

Terminal

E59

28

F52

4

Existed

9

7

P181A TRANSFER MOTOR TEMPERATURE SENSOR

DLN-73

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ATX90A]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

3.

CHECK TRANSFER MOTOR TEMPERATURE SENSOR

Check the transfer control actuator. Refer to 

DLN-73, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Transfer motor temperature sensor is malfunctioning. Replace transfer control actuator. Refer to

DLN-114, "Exploded View"

.

4.

CHECK TERMINALS AND HARNESS CONNECTORS

Check the pin terminals for damage or loose connection with each harness connector.

Is the inspection result normal?

YES

>> Replace transfer control unit. Refer to 

DLN-107, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

Component Inspection

INFOID:0000000006222273

1.

CHECK TRANSFER MOTOR TEMPERATURE SENSOR

1.

Turn the ignition switch OFF.

2.

Disconnect transfer control actuator harness connector.

3.

Check the resistance between transfer control actuator harness connector terminals.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Transfer motor temperature sensor is malfunctioning. Replace transfer control actuator. Refer to

DLN-114, "Exploded View"

.

Transfer control actuator

—

Continuity

Connector

Terminal

F52

7

Ground

Not existed

Transfer control actuator

Condition

Resistance

Terminal

4

7

20 

°

C (68 

°

F)

Approx. 12.5 k

Ω

80 

°

C (176 

°

F)

Approx. 1.3 k

Ω

DLN-74

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ATX90A]

P181B INCOMPLETE SELFSHUT

P181B INCOMPLETE SELFSHUT

DTC Logic

INFOID:0000000006222274

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Turn the ignition switch OFF.

2.

Perform self-diagnosis for “ALL MODE AWD/4WD”.

Is DTC “P181B” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-74, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006222275

1.

CHECK TRANSFER CONTROL UNIT POWER SUPPLY (1)

1.

Turn the ignition switch OFF.

2.

Disconnect transfer control unit harness connector.

3.

Check the voltage between transfer control unit harness connector and ground.

4.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

5.

Check the voltage between transfer control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK TRANSFER CONTROL UNIT POWER SUPPLY (2)

1.

Turn the ignition switch OFF.

2.

Check the 10A fuse (#34).

3.

Check the harness for open or short between transfer control unit harness connector No.20 terminal and
10A (#34).

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit. Refer to 

PG-11, "Wiring Diagram - BAT-

TERY POWER SUPPLY -"

.

NO

>> Repair or replace error-detected parts.

3.

CHECK TRANSFER CONTROL UNIT GROUND

1.

Turn the ignition switch OFF.

DTC

Display item

Malfunction detected condition

Possible cause

P181B

IMCOMP SELFSHUT

When ignition switch is OFF and transfer 
control unit power supply is lower or 
higher than normal

Self-shut is incomplete.

Transfer control unit

—

Voltage

Connector

Terminal

E59

20

Ground

Battery voltage

Transfer control unit

—

Voltage

Connector

Terminal

E59

20

Ground

Battery voltage

P181B INCOMPLETE SELFSHUT

DLN-75

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ATX90A]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

2.

Check the continuity between transfer control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK TERMINALS AND HARNESS CONNECTORS

Check transfer control unit pin terminals for damage or loose connection with harness connector.

Is inspection result normal?

YES

>> After turning the ignition switch OFF, perform DTC confirmation procedure again. When DTC

"P181B" is detected, Replace transfer control unit. Refer to 

DLN-107, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

Transfer control unit

—

Continuity

Connector

Terminal

E60

44

Ground

Existed

46