Infiniti QX56 (Z62). Manual - part 470

DLN-80

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ATX90A]

P1826 TRANSFER FLUID TEMPERATURE

P1826 TRANSFER FLUID TEMPERATURE

DTC Logic

INFOID:0000000006222285

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 “P1826” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-80, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006222286

1.

CHECK TRANSFER FLUID TEMPERATURE SENSOR POWER SUPPLY

1.

Turn the ignition switch OFF.

2.

Disconnect transfer fluid temperature sensor harness connector.

3.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

4.

Check the voltage between transfer fluid temperature sensor harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK TRANSFER FLUID 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 fluid temperature sensor harness connector and ground.

DTC

Display item

Malfunction detected condition

Possible cause

P1826

OIL TEMP SEN

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

Transfer fluid temperature
• Malfunction of transfer fluid tempera-

ture sensor circuit (open)

When transfer fluid temperature is high-
er than normal

Transfer fluid temperature
• Malfunction of transfer fluid tempera-

ture sensor circuit (short)

+

−

Voltage

Transfer fluid temperature sensor

Connector

Terminal

F37

2

1

Approx. 5 V

Transfer control unit

Transfer fluid temperature sensor

Continuity

Connector

Terminal

Connector

Terminal

E59

7

F37

2

Existed

36

1

P1826 TRANSFER FLUID TEMPERATURE

DLN-81

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ATX90A]

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Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

3.

CHECK TRANSFER FLUID TEMPERATURE SENSOR

Check the transfer fluid temperature sensor. Refer to 

DLN-81, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace transfer fluid temperature sensor. Refer to 

DLN-120, "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:0000000006222287

1.

CHECK TRANSFER FLUID TEMPERATURE SENSOR

1.

Turn the ignition switch OFF.

2.

Disconnect transfer fluid temperature sensor harness connector.

3.

Check the resistance between transfer control fluid temperature sensor connector terminals.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace transfer fluid temperature sensor. Refer to 

DLN-120, "Exploded View"

.

Transfer fluid temperature sensor

—

Continuity

Connector

Terminal

F37

2

Ground

Not existed

Transfer fluid temperature sensor

Condition

Resistance

Terminal

2

1

20 

°

C (68 

°

F)

Approx. 2.5 k

Ω

80 

°

C (176 

°

F)

Approx. 0.3 k

Ω

DLN-82

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ATX90A]

P1829 ACCELERATOR PEDAL POSITION SENSOR

P1829 ACCELERATOR PEDAL POSITION SENSOR

DTC Logic

INFOID:0000000006222288

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.

2.

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

Is DTC “P1829” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-82, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006222289

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

"P1829" 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

P1829

THROTTLE POSI SEN

Malfunction is detected in accelerator 
pedal position signal that is output from 
ECM through CAN communication.

• Harness or connector (CAN communi-

cation line)

• Internal malfunction of ECM

P182A TRANSFER HI-LO POSITION SENSOR

DLN-83

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ATX90A]

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P182A TRANSFER HI-LO POSITION SENSOR

DTC Logic

INFOID:0000000006222290

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Start the engine.

CAUTION:

Never drive the vehicle.

2.

Turn the 4WD shift switch AUTO

⇒

4H

⇒

4LO

⇒

4H

⇒

AUTO.

3.

Drive at 20 km/h (12MPH) or more for 1 minute or more.

4.

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

Is DTC “P182A” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-83, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006222291

1.

CHECK TRANSFER HI-LO POSITION SENSOR SIGNAL

1.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

2.

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

CAUTION:

After operating 4WD shift switch, move the vehicle back and forth to check voltage.
Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 2.

2.

CHECK TRANSFER HI-LO POSITION SENSOR POWER SUPPLY

1.

Turn the ignition switch OFF.

2.

Disconnect transfer Hi-Lo position sensor harness connector.

3.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

4.

Check the voltage between transfer Hi-Lo position sensor harness connector terminals.

DTC

Display item

Malfunction detected condition

Possible cause

P182A

HI-LO POSITION SEN

Malfunction related to transfer Hi-Lo po-
sition sensor has been detected.

Internal malfunction of transfer Hi-Lo po-
sition sensor

+

−

Condition

Voltage

Transfer control unit

Connector

Terminal

E59

6

Ground

4WD mode: AUTO or 4H

Approx. 0 V

4WD mode: 4L

Approx. 5 V

25

4WD mode: AUTO or 4H

Approx. 0 V

4WD mode: 4L

Approx. 5 V