Nissan Titan A60. Manual - part 272

P1810 4 LO SWITCH

DLN-27

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TX15B]

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P1810 4 LO SWITCH

Description

INFOID:0000000006179445

The 4LO switch detects that the transfer case is in 4LO range.  DTC P1810 or flash code 6 will set when an

improper signal from the 4LO switch is input due to an open or short circuit.

DTC Logic

INFOID:0000000006179446

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Perform self-diagnosis.
Is DTC P1810 or flash code 6 displayed?

YES

>> Perform diagnosis procedure. Refer to 

DLN-27, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000006179447

Regarding Wiring Diagram information, refer to 

DLN-62, "Wiring Diagram"

.

1.

CHECK 4LO POSITION SWITCH SIGNAL

With CONSULT-III

1. Start engine.

2. Select DATA MONITOR mode for ALL MODE AWD/4WD with CONSULT-III.

3. Read out the value of 4L POSI SW.

Without CONSULT-III

1. Start engine.

2. Check voltage between transfer control unit harness connector

terminal and ground.

OK or NG

DTC

CONSULT-III

Diagnostic item is detected when...

Reference

[P1810]

4L POSI SW TF

Improper signal from 4LO switch is input 
due to open or short circuit.

DLN-27, "Diagnosis Procedure"

Condition

Display value

• Vehicle stopped
• Engine running
• A/T selector lever N position
• Brake pedal depressed

4WD shift switch: 4LO

ON

Except the above

OFF

Connector

Terminal

Condition

Voltage 

(Approx.)

E142

 24 - 

Ground

• Vehicle stopped
• Engine running
• A/T selector lever 

N position

• Brake pedal de-

pressed

4WD shift switch: 4LO

0V

Except the above

Battery 
voltage

SDIA3363E

DLN-28

< DTC/CIRCUIT DIAGNOSIS >

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P1810 4 LO SWITCH

OK 

>> GO TO 5.

NG

>> GO TO 2.

2.

CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND 4LO SWITCH

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

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

3. Check continuity between transfer control unit harness connec-

tor E142 terminal 24 and 4LO switch harness connector F60 ter-

minal 13.

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

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts.

3.

CHECK GROUND CIRCUIT

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

2. Disconnect 4LO switch harness connector.

3. Check continuity between 4LO switch harness connector F60

terminal 12 and ground.

Also check harness for short to power.

 OK or NG

 OK 

>> GO TO 4.

 NG

>> Repair open circuit or short to power in harness or con-

nectors.

4.

CHECK 4LO SWITCH 

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

2. Disconnect 4LO switch harness connector.

3. Remove 4LO switch. Refer to 

DLN-12, "Component Parts Location"

.

4. Push and release 4LO switch and check continuity between

4LO switch terminals 12 and 13.

OK or NG

OK

>> GO TO 5.

NG

>> Replace 4LO switch.

5.

CHECK TRANSFER CONTROL UNIT

Check transfer control unit input/output signal. Refer to 

DLN-55, "Reference Value"

.

OK or NG

OK

>> GO TO 6.

NG

>> 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

Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG

Continuity should exist.

SDIA3364E

Continuity should exist.

PDIA0203E

Terminal

Condition

Continuity

12 - 13

Push 4LO switch

Yes

Release 4LO switch

No

PDIA0204E

P1810 4 LO SWITCH

DLN-29

< DTC/CIRCUIT DIAGNOSIS >

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OK

>> Inspection End.

NG

>> Replace transfer control unit. Refer to 

DLN-93, "Removal and Installation"

.

Component Inspection

INFOID:0000000006179448

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

DLN-12, "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

PDIA0204E

DLN-30

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TX15B]

P1813 4WD SHIFT SWITCH

P1813 4WD SHIFT SWITCH

Description

INFOID:0000000006179449

The 4WD shift switch allows the driver to select 2WD or 4WD and 4H or 4LO.  DTC P1813 or flash code 9 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

INFOID:0000000006179450

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Perform self-diagnosis.
Is DTC P1813 or flash code 9 displayed?

YES

>> Perform diagnosis procedure. Refer to 

DLN-30, "Diagnosis Procedure (With 3 Control Dial Sys-

tem Without Auto A/C)"

 or 

DLN-32, "Diagnosis Procedure (With 2 Control Dial System or Auto A/

C)"

.

NO

>> Inspection End.

Diagnosis Procedure (With 3 Control Dial System Without Auto A/C)

INFOID:0000000006179451

Regarding Wiring Diagram information, refer to 

DLN-62, "Wiring Diagram"

.

1.

CHECK 4WD SHIFT SWITCH SIGNAL

With CONSULT-III

1. Turn ignition switch ON.

2. Select DATA MONITOR mode for ALL MODE AWD/4WD with CONSULT-III.

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

shift switch.

Without CONSULT-III

1. Turn ignition switch ON.

2. Check voltage between transfer control unit harness connector

terminals and ground.

DTC

CONSULT-III

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-30, "Diagnosis Procedure (With 3 
Control Dial System Without Auto A/C)"

 

or,

DLN-32, "Diagnosis Procedure (With 2 
Control Dial System or Auto A/C)"

SDIA3365E