Nissan Frontier D40. Manual - part 320

DIFFERENTIAL LOCK CONTROL UNIT

DLN-301

< ECU DIAGNOSIS >

[REAR FINAL DRIVE: M226 (ELD) ]

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DTC Index

INFOID:0000000005275628

CAUTION:

If “CAN COMM CIRCUIT [U1000]” is displayed with other DTCs, first perform the trouble diagnosis for CAN communication
line.

Items (CONSULT-III screen 

terms)

Diagnostic item is detected when...

Check item

INITIAL START
[P1833]

Due to removal of battery which cuts off power supply to differential 
control unit, self-diagnosis memory function is suspended.

DLN-275, "Description"

CONTROL UNIT 1
[P1834]

Malfunction is detected in the memory (RAM) system of differential 
lock control unit.

DLN-276, "Description"

CONTROL UNIT 2
[P1835]

Malfunction is detected in the memory (ROM) system of differential 
lock control unit.

DLN-277, "Description"

CONTROL UNIT 3
[P1836]

Malfunction is detected in the memory (EEPROM) system of differ-
ential lock control unit.

DLN-278, "Description"

CONTROL UNIT 4
[P1837]

AD converter system of differential lock control unit is malfunctioning.

DLN-279, "Description"

ON SW
[P1838]

More than two switch inputs are simultaneously detected due to 
short circuit of differential lock mode switch.

DLN-280, "Description"

POSI SW ON
[P1839]

When differential lock position switch is ON, rotation difference oc-
curs in wheel speed (rear wheel right and left).

DLN-282, "Description"

RELAY
[P1844]

Differential lock control unit detects as irregular by comparing target 
value with monitor value.

DLN-284, "Description"

SOL CIRCUIT
[P1847]

Malfunction is detected in differential lock control unit internal circuit.

DLN-285, "Description"

SOL DISCONNECT
[P1848]

• Differential lock solenoid internal circuit or harness is open.
• Differential lock solenoid relay does not switch to ON position.

DLN-286, "Description"

SOL SHORT
[P1849]

Differential lock solenoid internal circuit or harness is shorted.

DLN-288, "Description"

SOL CURRENT
[P1850]

Differential lock solenoid relay does not switch to OFF position.

DLN-290, "Description"

ABS SYSTEM
[C1203]

Malfunction related to wheel sensor has been detected by ABS ac-
tuator and electric unit (control unit).

DLN-292, "Description"

CAN COMM CIRCUIT
[U1000]

Malfunction has been detected from CAN communication line.

DLN-274, "Description"

NO DTC IS DETECTED.
FURTHER TESTING MAY 
BE REQUIRED.

No malfunction has been detected.

—

DLN-302

< SYMPTOM DIAGNOSIS >

[REAR FINAL DRIVE: M226 (ELD) ]

DIFF LOCK INDICATOR LAMP INOPERATIVE

SYMPTOM DIAGNOSIS

DIFF LOCK INDICATOR LAMP INOPERATIVE

Inspection Procedure

INFOID:0000000005275629

SYMPTOM:
DIFF LOCK indicator lamp does not turn ON for approx. 1 second when turning ignition switch to
“ON”.

DIAGNOSTIC PROCEDURE

1.

PERFORM DIFFERENTIAL LOCK CONTROL UNIT SELF DIAGNOSIS

Perform self-diagnosis. Refer to 

DLN-272, "DIFFERENTIAL LOCK CONTROL UNIT : CONSULT-III Function

(DIFF LOCK)"

.

Were any DTC’s displayed?

YES

>>  Refer to 

DLN-301, "DTC Index"

.

NO

>> GO TO 2.

2.

CHECK DIFFERENTIAL LOCK CONTROL UNIT POWER SUPPLY AND GROUND CIRCUIT 

Check the differential lock control unit for proper power and ground. Refer to 

DLN-275, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector. 

3.

CHECK DIFF LOCK INDICATOR LAMP POWER SUPPLY

Check power supply to the combination meter (DIFF LOCK indicator lamp). Refer to 

MWI-29, "COMBINATION

METER : Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connectors.

4.

CHECK DIFF LOCK INDICATOR LAMP CONTROL

Check the DIFF LOCK indicator lamp control circuit. Refer to 

DLN-293, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Replace the differential lock control unit. Refer to 

DLN-310, "Removal and Installation"

.

NO

>> Repair malfunctioning component. 

DIFF LOCK INDICATOR LAMP DOES NOT TURN ON WITH DIFFERENTIAL 

LOCK SWITCHED ON

DLN-303

< SYMPTOM DIAGNOSIS >

[REAR FINAL DRIVE: M226 (ELD) ]

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DIFF LOCK INDICATOR LAMP DOES NOT TURN ON WITH DIFFEREN-
TIAL LOCK SWITCHED ON

Inspection Procedure

INFOID:0000000005275630

SYMPTOM:
DIFF LOCK indicator lamp does not turn ON when turning differential lock mode switch to “ON” after
engine start.

DIAGNOSTIC PROCEDURE

1.

CHECK DIFF LOCK INDICATOR LAMP

Confirm the DIFF LOCK indicator lamp proves out when ignition switch is turned ON.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Refer to 

DLN-302, "Inspection Procedure"

.

2.

CHECK SELF-DIAGNOSTIC RESULTS

Perform self-diagnosis. Refer to 

DLN-272, "DIFFERENTIAL LOCK CONTROL UNIT : CONSULT-III Function

(DIFF LOCK)"

.

Is any DTC detected by self-diagnosis?

YES

>> Check the malfunctioning system. Refer to 

DLN-301, "DTC Index"

.

NO

>> GO TO 3.

3.

CHECK DIFFERENTIAL LOCK MODE SWITCH OPERATION

Check differential lock mode switch. Refer to 

DLN-282, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair component, harness or connector.

4.

CHECK DIFFERENTIAL LOCK CONTROL UNIT POWER SUPPLY AND GROUND CIRCUIT

Check differential lock control unit power supply and ground circuit. Refer to 

DLN-275, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Replace the differential lock control unit. Refer to 

DLN-310, "Removal and Installation"

.

NO

>> Repair harness or connector.

DLN-304

< SYMPTOM DIAGNOSIS >

[REAR FINAL DRIVE: M226 (ELD) ]

DIFF LOCK INDICATOR LAMP FLASHES WHILE DRIVING

DIFF LOCK INDICATOR LAMP FLASHES WHILE DRIVING

Description

INFOID:0000000005275631

The DIFF LOCK indicator lamp will flash once every 2 seconds when the differential lock system is in standby
condition. Standby condition is the time between when the differential lock mode switch is turned ON and
when the differential lock control unit see’s all conditions are met to engage the differential lock. The DIFF
LOCK indicator lamp should be OFF if there has been a malfunction detected. For more information regarding
the differential lock system operation, refer to the Owner’s Manual. 

Inspection Procedure

INFOID:0000000005275632

SYMPTOM:
DIFF LOCK indicator lamp sometimes flashes while driving.

DIAGNOSTIC PROCEDURE

1.

CHECK SELF-DIAGNOSTIC RESULTS

Perform self-diagnosis. Refer to 

DLN-272, "DIFFERENTIAL LOCK CONTROL UNIT : CONSULT-III Function

(DIFF LOCK)"

.

Is any malfunction detected by self-diagnosis?

YES

>> Check the malfunctioning system. Refer to 

DLN-301, "DTC Index"

.

NO

>> GO TO 2.

2.

CHECK DIFFERENTIAL LOCK MODE SWITCH

Perform trouble diagnosis for differential lock mode switch. Refer to 

DLN-280, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Condition is intermittent. Refer to 

GI-46, "Intermittent Incident"

.

NO

>> Repair or replace malfunctioning component.