Infiniti QX56 (Z62). Manual - part 466

DLN-64

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ATX90A]

P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT

P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT

Description

INFOID:0000000006222260

Supplies power to transfer control unit.

DTC Logic

INFOID:0000000006222261

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 “P1811” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-64, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006222262

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.

DTC

Display item

Malfunction detected condition

Possible cause

P1811

BATTERY VOLTAGE

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

Malfunction of transfer control unit pow-
er supply circuit (open or short)

Transfer control unit

—

Voltage

Connector

Terminal

E59

20

Ground

Battery voltage

Transfer control unit

—

Voltage

Connector

Terminal

E59

20

Ground

Battery voltage

P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT

DLN-65

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ATX90A]

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DLN

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3.

CHECK TRANSFER CONTROL UNIT POWER SUPPLY (3)

1.

Turn the ignition switch OFF.

2.

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

3.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

4.

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

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

CHECK TRANSFER CONTROL UNIT POWER SUPPLY (4)

1.

Turn the ignition switch OFF.

2.

Check the 10A fuse (#56).

3.

Disconnect IPDM E/R harness connector.

4.

Check the continuity between transfer control unit harness connector and IPDM E/R harness connector.

5.

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

Is the inspection result normal?

YES

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

PG-89, "Wiring Diagram -

IGNITION POWER SUPPLY -"

.

NO

>> Repair or replace error-detected parts.

5.

CHECK TRANSFER CONTROL UNIT GROUND

1.

Turn the ignition switch OFF.

2.

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

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace error-detected parts.

6.

CHECK TERMINALS AND HARNESS CONNECTORS

Transfer control unit

—

Voltage

Connector

Terminal

E59

32

Ground

0 V

Transfer control unit

—

Voltage

Connector

Terminal

E59

32

Ground

Battery voltage

IPDM E/R

Transfer control unit

Continuity

Connector

Terminal

Connector

Terminal

E15

58

E59

32

Existed

Transfer control unit

—

Continuity

Connector

Terminal

E59

32

Ground

Not existed

Transfer control unit

—

Continuity

Connector

Terminal

E60

46

Ground

Existed

44

DLN-66

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ATX90A]

P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT

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

P1813 4WD MODE SWITCH

DLN-67

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ATX90A]

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P1813 4WD MODE SWITCH

DTC Logic

INFOID:0000000006222263

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Turn the ignition switch OFF to ON.

2.

Turn the 4WD shift switch AUTO

⇒

4H

⇒

4LO

⇒

4H

⇒

AUTO.

3.

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

Is DTC “P1813” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-67, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006222264

1.

CHECK TRANSFER SHIFT SWITCH

Check 4WD switch assembly. Refer to 

DLN-68, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> 4WD shift switch is malfunctioning. Replace 4WD switch assembly. Refer to 

DLN-108, "Removal

and Installation"

.

2.

CHECK 4WD SHIFT SWITCH CIRCUIT (1)

1.

Disconnect transfer control unit harness connector.

2.

Check the continuity between transfer control unit harness connector and 4WD switch assembly harness
connector.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace error-detected parts.

DTC

Display item

Malfunction detected condition

Possible cause

P1813

4WD MODE SW

Multiple signals received from 4WD shift 
switch are detected.

• 4WD switch assembly
- Internal malfunction of 4WD switch 

assembly

- Malfunction of 4WD switch assembly 

circuit

• Transfer control unit

Transfer control unit

4WD switch assembly

Continuity

Connector

Terminal

Connector

Terminal

E59

11

M54

11

Existed

10

Not existed

9

Not existed

35

11

Not existed

10

Existed

9

Not existed

14

11

Not existed

10

Not existed

9

Existed