Infiniti QX56 (Z62). Manual - part 469

DLN-76

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ATX90A]

P181C TRANSFER MOTOR POWER SUPPLY

P181C TRANSFER MOTOR POWER SUPPLY

Description

INFOID:0000000006222276

Supplies power to transfer control actuator (transfer motor).

DTC Logic

INFOID:0000000006222277

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Turn the ignition switch OFF to ON.

2.

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

Is DTC “P181C” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-76, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006222278

1.

CHECK TRANSFER MOTOR POWER SUPPLY (2)

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 MOTOR POWER SUPPLY CIRCUIT (2)

1.

Turn the ignition switch OFF.

2.

Check the 30A fusible link (J).

3.

Check the harness for open or short between transfer control unit harness connector No.41 terminal and
30A fusible link (J).

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 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.

DTC

Display item

Malfunction detected condition

Possible cause

P181C

MOTOR POWER SUPPLY

When transfer control actuator power 
supply is lower or higher than normal

Malfunction of transfer control actuator 
(transfer motor) power supply circuit

+

−

Voltage

Transfer control unit

Connector

Terminal

E60

41

46

Battery voltage

P181E STEERING ANGLE SENSOR

DLN-77

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ATX90A]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

P181E STEERING ANGLE SENSOR

DTC Logic

INFOID:0000000006222279

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Turn the ignition switch OFF to ON.

2.

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

Is DTC “P181E” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-77, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006222280

1.

PERFORM ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS

With CONSULT-III

Perform self-diagnosis for “ABS”.

Is DTC “C1143” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

BRC-97, "Diagnosis Procedure"

.

NO

>> GO TO 2.

2.

CHECK CAN COMMUNICATION LINE

Check communication line. Refer to 

LAN-69, "Diagnosis Procedure"

.

Is inspection result normal?

YES

>> Replace transfer control unit. Refer to 

DLN-107, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

DTC

Display item

Malfunction detected condition

Possible cause

P181E

ST ANGLE SEN SIG

Malfunction is detected in steering angle 
sensor signal through CAN communica-
tion.

• Harness or connector (CAN communi-

cation line)

• Steering angle sensor
- Steering angle sensor error
- Malfunction of steering angle sensor 

circuit error

DLN-78

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ATX90A]

P181F INCOMPLETE CALIBRATION

P181F INCOMPLETE CALIBRATION

DTC Logic

INFOID:0000000006222281

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Turn the ignition switch OFF to ON.

2.

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

Is DTC “P181F” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-78, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006222282

1.

PERFORM INITIAL CALIBRATION

1.

Erase self-diagnostic result for “ALL MODE AWD/4WD”.

2.

Perform initial calibration. Refer to 

DLN-41, "Work Procedure"

.

3.

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

Is any DTC except “P181F” detected?

YES

>> Check DTC.

NO

>> GO TO 2.

2.

PERFORM SELF-DIAGNOSIS

With CONSULT-III

1.

Erase self-diagnostic result for “ALL MODE AWD/4WD”.

2.

Turn the ignition switch OFF, and then wait 10 seconds or more.

3.

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

Is DTC “P181F” detected?

YES

>> Replace transfer control unit. Refer to 

DLN-107, "Removal and Installation"

.

NO

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

If any items are damaged, repair or replace the error-detected parts.

DTC

Display item

Malfunction detected condition

Possible cause

P181F

INCOMP CALIBRATION

When incomplete calibration of transfer 
control unit is detected.

Initial calibration of transfer is incom-
plete

P1820 ENGINE SPEED SIGNAL

DLN-79

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ATX90A]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

P1820 ENGINE SPEED SIGNAL

DTC Logic

INFOID:0000000006222283

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Start the engine and drive at 20 km/h (12 MPH) or more.

2.

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

Is DTC “P1820” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-79, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006222284

1.

PERFORM ECM SELF-DIAGNOSIS

With CONSULT-III

Perform self-diagnosis for “ENGINE”.

Is any DTCs detected?

YES

>> Check the DTCs.

NO

>> GO TO 2.

2.

ERASE SELF-DIAGNOSTIC RESULT

With CONSULT-III

1.

Erase self-diagnostic results for “ALL MODE AWD/4WD”.

2.

Turn the ignition switch OFF.

3.

Start the engine and drive vehicle for a while.

4.

Check that malfunction indicator lamp (MIL) turns OFF.

Does malfunction indicator lamp (MIL) turn OFF?

YES

>> GO TO 3.

NO

>> Refer to 

EC-515, "Diagnosis Procedure"

.

3.

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

"P1820" is detected, Replace transfer control unit. Refer to 

DLN-107, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

DTC

Display item

Malfunction detected condition

Possible cause

P1820

ENGINE SPEED SIG

Malfunction is detected in engine speed 
signal that is output from ECM through 
CAN communication.

• Harness or connector (CAN communi-

cation line)

• Internal malfunction of ECM