Infiniti QX56 (JA60). Manual - part 278

P1813 4WD SHIFT SWITCH

DLN-35

< COMPONENT DIAGNOSIS >

[ATX14B]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

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

1 - 4

4WD shift switch: 2WD

No

4WD shift switch: AUTO, 4H and 
4LO

Yes

1 - 5

4WD shift switch: 4H

Yes

4WD shift switch: 2WD, AUTO, 
and 4LO

No

1 - 6

4WD shift switch: 4LO

Yes

4WD shift switch: 2WD, AUTO and 
4H

No

Terminal

Condition

Continuity

DLN-36

< COMPONENT DIAGNOSIS >

[ATX14B]

P1814 WAIT DETECTION SWITCH

P1814 WAIT DETECTION SWITCH

Description

INFOID:0000000005148796

The wait detection switch detects if the transfer case is in 4WD.  DTC P1814 will set if an improper signal from

the wait detection switch is input due to open or short circuit.

DTC Logic

INFOID:0000000005148797

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Perform self-diagnosis.
Is DTC P1814 detected?

YES

>> Perform diagnosis procedure. Refer to 

DLN-36, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000005148798

Regarding Wiring Diagram information, refer to 

DLN-89, "Wiring Diagram - ALL-MODE 4WD SYSTEM -"

.

1.

CHECK WAIT DETECTION 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 WAIT DETCT SW.

Without CONSULT-III

1. Start engine.

DTC

CONSULT-III

Diagnostic item is detected when...

Reference

[P1814]

4WD DETECT SWITCH

Improper signal from wait detection 
switch is input due to open or short cir-
cuit.

Refer to 

DLN-36

.

Condition

Display value

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

4WD shift switch: 2WD, AUTO 
or 4H

OFF

4WD shift switch: 4H to 4LO 
(While actuator motor is operat-
ing.)

OFF 

→ ON

4WD shift switch: 4LO to 4H 
(While actuator motor is operat-
ing.)

ON 

→ OFF

4WD shift switch: 4LO

ON

P1814 WAIT DETECTION SWITCH

DLN-37

< COMPONENT DIAGNOSIS >

[ATX14B]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

2. Check voltage between transfer control unit harness connector

terminal and ground.

Are inspection results normal?

YES 

>> GO TO 5.

NO

>> GO TO 2.

2.

CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND WAIT DETECTION SWITCH

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

2. Disconnect transfer control unit harness connector and the wait detection switch harness connector.

3. Check continuity between transfer control unit harness connec-

tor E143 terminal 43 and wait detection switch harness connec-

tor F59 terminal 10.

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

Are inspection results normal?

YES

>> GO TO 3.

NO

>> Repair or replace damaged parts.

3.

CHECK GROUND CIRCUIT

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

2. Disconnect wait detection switch harness connector.

3. Check continuity between wait detection switch harness con-

nector F59 terminal 11 and ground.

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

Are inspection results normal?

YES 

>> GO TO 4.

NO

>> Repair open circuit or short to ground or short to power

in harness or connectors.

4.

CHECK WAIT DETECTION SWITCH

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

2. Disconnect wait detection switch harness connector.

3. Remove wait detection switch. Refer to 

DLN-16, "Component Parts Location"

.

Connector

Terminal

Condition

Voltage 

(Approx.)

E143

43 - 

Ground

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

N position

• Brake pedal de-

pressed

4WD shift switch: 
2WD, AUTO or 4H

Battery 
voltage

4WD shift switch: 4H to 
4LO (While actuator 
motor is operating.)

Battery 
voltage 
→ 0V

4WD shift switch: 4LO 
to 4H (While actuator 
motor is operating.)

0V 

→ 

Battery 
voltage

4WD shift switch: 4LO

0V

SDIA2701E

Continuity should exist.

SDIA2702E

Continuity should exist.

SDIA2703E

DLN-38

< COMPONENT DIAGNOSIS >

[ATX14B]

P1814 WAIT DETECTION SWITCH

4. Push and release wait detection switch and check continuity

between wait detection switch terminals 10 and 11.

Are inspection results normal?

YES

>> GO TO 5.

NO

>> Replace wait detection switch.

5.

CHECK TRANSFER CONTROL UNIT

Check transfer control unit input/output signal. Refer to 

DLN-81, "Reference Value"

.

Are 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.
Are inspection results normal?

YES

>> Inspection End.

NO

>> Replace transfer control unit. Refer to 

DLN-130, "Removal and Installation"

.

Component Inspection

INFOID:0000000005148799

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

DLN-16, "Component Parts Location"

.

4. Push and release wait detection switch and check continuity

between wait detection switch terminals 10 and 11.

5. If the inspection results are abnormal replace the wait detection

switch.

Terminal

Condition

Continuity

10 - 11

Push wait detection switch

Yes

Release wait detection switch

No

SDIA2704E

Terminal

Condition

Continuity

10 - 11

Push wait detection switch

Yes

Release wait detection switch

No

SDIA2704E