Nissan Frontier. Instruction - part 282

DLN-30

< DTC/CIRCUIT DIAGNOSIS >

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P1810 4 LO SWITCH

Component Inspection

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1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Disconnect 4LO switch harness connector.
3. Remove 4LO switch. Refer to 

DLN-13, "Component Parts Location"

.

4. Push and release 4LO switch and check continuity between 4LO switch terminals 12 and 13.

5. If the inspection results are not normal replace the 4LO switch.

Terminal

Condition

Continuity

12 - 13

Push 4LO switch

Yes

Release 4LO switch

No

P1813 4WD SHIFT SWITCH

DLN-31

< DTC/CIRCUIT DIAGNOSIS >

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P1813 4WD SHIFT SWITCH

Description

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The 4WD shift switch allows the driver to select 2WD or 4WD and 4H or 4LO. DTC P1813 will set if more than

two switch inputs are simultaneously detected by the transfer control unit due to a short circuit in the 4WD shift

switch.

DTC Logic

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DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Perform self-diagnosis.
Is DTC P1813 displayed?

YES

>> Perform diagnosis procedure. Refer to 

DLN-31, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

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Regarding Wiring Diagram information, refer to 

DLN-63, "Wiring Diagram"

.

1.

CHECK 4WD SHIFT SWITCH SIGNAL

With CONSULT

1. Turn ignition switch “ON”.

2. Select “DATA MONITOR” mode for “ALL MODE AWD/4WD” with CONSULT.

3. Read out ON/OFF switching action of the “2WD SWITCH”, “4H SWITCH”, “4L SWITCH” with operating

4WD shift switch.

Without CONSULT

1. Turn ignition switch “ON”.

2. Check voltage between transfer control unit harness connector

terminals and ground.

Are the inspection results normal?

YES 

>> GO TO 5.

DTC

CONSULT

Diagnostic item is detected when...

Reference

[P1813]

4WD MODE SW

More than two switch inputs are simulta-
neously detected due to short circuit of 
4WD shift switch.

DLN-31

Connector

Terminal

Condition

Voltage (Ap-

prox.)

M152

14 - Ground

4WD shift switch: 2WD

Battery voltage

4WD shift switch: 4H and 4LO

0V

15 - Ground

4WD shift switch: 4H

Battery voltage

4WD shift switch: 2WD and 4LO

0V

 16 - Ground

4WD shift switch: 4LO

Battery voltage

4WD shift switch: 2WD and 4H

0V

SDIA3365E

DLN-32

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TX15B]

P1813 4WD SHIFT SWITCH

NO

>> GO TO 2.

2.

CHECK 4WD SHIFT SWITCH POWER SUPPLY CIRCUIT

1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)

2. Disconnect 4WD shift switch harness connector.

3. Check voltage between 4WD shift switch harness connector ter-

minal 1 and ground.

4. Turn ignition switch “ON”. (Do not start engine.)

5. Check voltage between 4WD shift switch harness connector ter-

minal 1 and ground.

Is there voltage?

YES

>> GO TO 3.

NO

>> 1. Check harness for short or open between 4WD shift

switch harness connector terminal 1 and transfer

shut off relay 2 harness connector E157 terminal 5

and 10A fuse (No. 58 located in the fuse and relay box). If any items are damaged, repair or

replace damaged parts.

2. Perform trouble diagnosis for power supply circuit. Refer to 

DLN-21, "Diagnosis Procedure"

.

3.

CHECK HARNESS BETWEEN 4WD SHIFT SWITCH AND TRANSFER CONTROL UNIT

1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)

2. Disconnect transfer control unit harness connector and the 4WD shift switch harness connector.

3. Check continuity between the following terminals.

-

Transfer control unit harness connector M152 terminal 14 and

4WD shift switch harness connector M141 terminal 3.

-

Transfer control unit harness connector M152 terminal 15 and

4WD shift switch harness connector M141 terminal 5.

-

Transfer control unit harness connector M152 terminal 16 and

4WD shift switch harness connector M141 terminal 6.

Also check harness for short to ground and short to power.

Is there continuity?

YES 

>> GO TO 4.

NO

>> Repair or replace damaged parts.

4.

CHECK 4WD SHIFT SWITCH

1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)

2. Remove 4WD shift switch harness connector.

3. Operate 4WD shift switch and check continuity between 4WD shift switch terminals.

Connector

Terminal

Voltage (Approx.)

M141

1 - Ground

0V

SDIA2803E

Connector

Terminal

Voltage (Approx.)

M141

1 - Ground

Battery voltage

SDIA2802E

Continuity should exist.

SDIA3366E

Terminal

Condition

Continuity

1 - 3

4WD shift switch: 2WD

Yes

4WD shift switch: 4H and 4LO

No

P1813 4WD SHIFT SWITCH

DLN-33

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Are the inspection results normal?

YES

>> GO TO 5.

NO

>> Replace 4WD shift switch.

5.

CHECK TRANSFER CONTROL UNIT

Check transfer control unit input/output signal. Refer to 

DLN-56, "Reference Value"

.

Are the inspection results normal?

YES

>> GO TO 6.

NO

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

If any items are damaged, repair or replace damaged parts.

6.

CHECK DTC

Drive the vehicle and then perform self-diagnosis.
Is DTC P1813 displayed?

YES

>> Replace transfer control unit. Refer to 

DLN-92, "Removal and Installation"

.

NO

>> Inspection End.

Component Inspection

INFOID:0000000009479654

1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Remove 4WD shift switch harness connector. 
3. Operate 4WD shift switch and check continuity between 4WD shift switch terminals.

4. If the inspection results are abnormal replace the 4WD shift switch.

1 - 5

4WD shift switch: 4H

Yes

4WD shift switch: 2WD and 4LO

No

1 - 6

4WD shift switch: 4LO

Yes

4WD shift switch: 2WD and 4H

No

Terminal

Condition

Continuity

Terminal

Condition

Continuity

1 - 3

4WD shift switch: 2WD

Yes

4WD shift switch: 4H and 4LO

No

1 - 5

4WD shift switch: 4H

Yes

4WD shift switch: 2WD and 4LO

No

1 - 6

4WD shift switch: 4LO

Yes

4WD shift switch: 2WD and 4H

No