Infiniti QX56 (Z62). Manual - part 463

DLN-52

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ATX90A]

P1807 OUT PUT SHAFT SPEED SENSOR

P1807 OUT PUT SHAFT SPEED SENSOR

DTC Logic

INFOID:0000000006222246

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Start the engine and drive at 30 km/h (19 MPH) or more for approximately 1minute.

2.

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

Is DTC “P1807” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-52, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006222247

1.

PERFORM TCM SELF-DIAGNOSIS

With CONSULT-III

Perform self-diagnosis for “TRANSMISSION”.

Is any DTCs detected?

YES

>> Check the DTC.

NO

>> GO TO 2.

2.

ERASE SELF-DIAGNOSTIC RESULT

With CONSULT-III

1.

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

2.

Start the engine and drive vehicle at 30 km/h (19 MPH) or more.

3.

Check that A/T CHECK indictor lamp turns OFF.

Does A/T CHECK indicator lamp turn OFF?

YES

>> GO TO 3.

NO

>> Refer to 

TM-165, "Symptom Table"

.

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

"P1807" 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

P1807

VHCL SPEED SEN-AT

• Malfunction is detected in output 

speed signal that is output from TCM 
through CAN communication.

• Improper signal is input while driving.

• Harness or connector (CAN communi-

cation line)

• TCM
-  Internal malfunction of TCM
-  Output speed signal error

P1808 WHEEL SPEED SENSOR

DLN-53

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ATX90A]

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P1808 WHEEL SPEED SENSOR

DTC Logic

INFOID:0000000006222248

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Start the engine and drive at 30 km/h (19 MPH) or more for approximately 1minute.

2.

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

Is DTC “P1808” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-53, "DTC Logic"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006222249

1.

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

With CONSULT-III

Perform self-diagnosis for “ABS”.
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.

Start the engine and drive vehicle at 30 km/h (19 MPH) or more.

3.

Check that ABS warning lamp turns OFF.

Does ABS warning lamp turn OFF?

YES

>> GO TO 3.

NO

>> Refer to 

BRC-122, "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

"P1808" 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

P1808

VHCL SPEED SEN-ABS

• Malfunction is detected in vehicle 

speed signal that is output from ABS 
actuator and electric unit (control unit) 
through CAN communication.

• Improper signal is input while driving.

• Harness or connector (CAN communi-

cation line)

• Malfunction of ABS actuator and elec-

tric unit (control unit)

- Malfunction of ABS actuator and elec-

tric unit (control unit) circuit error

- Vehicle speed signal error

DLN-54

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ATX90A]

P180C SENSOR POWER SUPPLY (5V)

P180C SENSOR POWER SUPPLY (5V)

Description

INFOID:0000000006222250

Supplies power (5V) to transfer lock position sensor and transfer rotary position sensor.

DTC Logic

INFOID:0000000006222251

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 “P180C” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-54, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006222252

1.

CHECK TRANSFER LOCK POSITION SENSOR POWER SUPPLY (1)

1.

Turn the ignition switch OFF.

2.

Disconnect transfer lock position sensor harness connector and transfer rotary position sensor harness
connector.

3.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

4.

Check the voltage between transfer lock position sensor harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK TRANSFER LOCK POSITION 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 lock position sensor
harness connector.

DTC

Display item

Malfunction detected condition

Possible cause

P180C

SEN POWER SUPPLY (5V)

When the sensor power supply (5V) volt-
age is lower or higher than normal.

• Malfunction of transfer lock position 

sensor power supply circuit (open or 
short)

• Malfunction of transfer rotary position 

sensor power supply circuit (open or 
short)

+

−

Voltage

Transfer lock position sensor

Connector

Terminal

F40

1

2

Approx. 5 V

P180C SENSOR POWER SUPPLY (5V)

DLN-55

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ATX90A]

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4.

Check the continuity between transfer lock position sensor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

3.

CHECK TRANSFER LOCK POSITION SENSOR POWER SUPPLY (2)

1.

Turn the ignition switch OFF.

2.

Connect transfer lock position sensor harness connector.

3.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

4.

Check the voltage between transfer lock position sensor harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace transfer lock position sensor. Refer to 

DLN-119, "Removal and Installation"

.

4.

CHECK TRANSFER ROTARY POSITION SENSOR POWER SUPPLY (1)

1.

Turn the ignition switch OFF.

2.

Connect transfer control unit harness connector.

3.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

4.

Check the voltage between transfer rotary position sensor harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

CHECK TRANSFER ROTARY POSITION 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 rotary position sensor
harness connector.

Transfer control unit

Transfer lock position sensor

Continuity

Connector

Terminal

Connector

Terminal

E59

17

F40

1

Existed

30

2

Transfer lock position sensor

—

Continuity

Connector

Terminal

F40

1

Ground

Not existed

+

−

Voltage

Transfer lock position sensor

Connector

Terminal

F40

1

2

Approx. 5 V

+

−

Voltage

Transfer rotary position sensor

Connector

Terminal

F41

1

2

Approx. 5 V