Nissan Titan. Manual - part 162

DLN-220

< DTC/CIRCUIT DIAGNOSIS >

[REAR FINAL DRIVE: M226 (ELD) ]

P1836 CONTROL UNIT 3

P1836 CONTROL UNIT 3

Description

INFOID:0000000009886115

Replace the differential lock control unit if this DTC is displayed. Refer to 

DLN-251, "Removal and Installation"

.

DTC Logic

INFOID:0000000009886116

DTC

Display contents of CONSULT

DTC Detection Condition

Action to take

P1836

CONTROL UNIT 3
[P1836]

A malfunction is detected in the memory (EEPROM) of 
the differential lock control unit. 

Replace differential lock 
control unit. Refer to 

DLN-

251, "Removal and Installa-
tion"

P1837 CONTROL UNIT 4

DLN-221

< DTC/CIRCUIT DIAGNOSIS >

[REAR FINAL DRIVE: M226 (ELD) ]

C

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DLN

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P1837 CONTROL UNIT 4

Description

INFOID:0000000009886117

Replace the differential lock control unit if this DTC is displayed. Refer to 

DLN-251, "Removal and Installation"

.

DTC Logic

INFOID:0000000009886118

DTC

Display contents of CONSULT

DTC Detection Condition

Action to take

P1837

CONTROL UNIT 4
[P1837]

The AD converter system of the differential lock control 
unit is malfunctioning. 

Replace differential lock 
control unit. Refer to 

DLN-

251, "Removal and Installa-
tion"

DLN-222

< DTC/CIRCUIT DIAGNOSIS >

[REAR FINAL DRIVE: M226 (ELD) ]

P1838 ON SWITCH

P1838 ON SWITCH

Description

INFOID:0000000009886119

The differential lock mode switch sends differential lock ON/OFF signals to the differential lock control unit.  

DTC Logic

INFOID:0000000009886120

Diagnosis Procedure

INFOID:0000000009886121

Regarding Wiring Diagram information, refer to 

DLN-238, "Wiring Diagram"

.

1.

CHECK DIFFERENTIAL LOCK MODE SWITCH OPERATION

1. Turn ignition switch ON.

2. Using CONSULT, select “D-LOCK SW SIG” of DIFF LOCK data monitor items.

3. While operating the differential lock mode switch, check that the display value changes between ON/OFF.

Is the inspection result normal?

YES

>> Differential lock mode switch is operating properly.

NO

>> GO TO 2.

2.

CHECK DIFFERENTIAL LOCK MODE SWITCH POWER SUPPLY CIRCUIT

1. Disconnect differential lock mode switch connector.

2. Turn ignition switch ON.

3. Check voltage between differential lock mode switch connector

M72 terminal 3 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK DIFFERENTIAL LOCK MODE SWITCH SIGNAL

DTC

Display contents of CONSULT

DTC Detection Condition

Action to take

P1838

ON SW
[P1838]

Two switch inputs were simultaneously detected due to a 
short circuit in the differential lock mode switch. 

Inspect the differential lock 
mode switch. Refer to 

DLN-

222, "Diagnosis Procedure"

Switch ON

Display item ON

Switch OFF

Display item OFF

(+)

(-)

Voltage (Approx.)

Connector

Terminal

M72

 3

 Ground

Battery voltage

SDIA2534E

P1838 ON SWITCH

DLN-223

< DTC/CIRCUIT DIAGNOSIS >

[REAR FINAL DRIVE: M226 (ELD) ]

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1. Turn ignition switch OFF.

2. Connect differential lock mode switch connector.

3. Check voltage between differential lock control unit connector

B77 terminals 9, 22 and ground.

Is the inspection result normal?

YES 

>> Replace the differential lock control unit. Refer to 

DLN-251, "Removal and Installation"

.

NO

>> GO TO 4.

4.

CHECK DIFFERENTIAL LOCK MODE SWITCH

1. Turn ignition switch OFF.

2. Disconnect differential lock mode switch connector.

3. Operate differential lock mode switch and check continuity

between differential lock mode switch terminals.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace differential lock mode switch.

5.

CHECK HARNESS BETWEEN DIFFERENTIAL LOCK CONTROL UNIT AND DIFFERENTIAL LOCK

MODE SWITCH

1. Check continuity between differential lock control unit connector

B77 (A) terminals 9, 22 and differential lock mode switch con-

nector M72 (B) terminals 2, 1.

2. Check continuity between differential lock control unit connector

B77 (A) terminals 9, 22 and ground. 

Is the inspection result normal?

 YES  >> Replace the differential lock control unit. Refer to 

DLN-251, "Removal and Installation"

.

 NO

>> Repair harness or connector.

(+)

(-)

Differential lock mode 

switch

Voltage (Approx.)

Connector

Terminal

B77

 9

Ground

ON

Battery voltage

OFF

0V

 22

ON

0V

OFF

Battery voltage

SDIA2568E

Terminals

Differential lock mode switch

Continuity

1 - 3

ON

No

OFF

Yes

2 - 3

ON

Yes

OFF

No

SDIA2535E

Connector

Terminal

Connector

Terminal

Continuity

B77 (A)

9

M72 (B)

2

Yes

22

1

Connector

Terminal

Ground

Continuity

B77 (A)

9

No

22

ALDIA0165ZZ