Nissan Titan A60. Manual - part 324

P1850 SOLENOID CURRENT

DLN-235

< DTC/CIRCUIT DIAGNOSIS >

[REAR FINAL DRIVE: M226 (ELD) ]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

Check operation by applying power and ground to the differential

lock solenoid terminals.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Check for a mechanical malfunction with the differential

lock system. Replace differential lock solenoid.

4.

CHECK DIFFERENTIAL LOCK SOLENOID CIRCUIT

1. Disconnect differential lock control unit connector.

2. Check continuity between differential lock control unit connector

B77 (A) terminals 11, 12 and differential lock solenoid connector

C17 (B) terminals 2, 4.

3. Check continuity between differential lock control unit connector

B77 (A) terminals 11, 12 and ground.

Is the inspection result normal?

 YES

>> Replace the differential lock control unit. Refer to 

DLN-253, "Removal and Installation"

.

 NO

>> Repair harness or connector.

Component

(+)

(-)

Solenoid operation

Terminal

Terminal

Differential lock 

solenoid

2

4

Yes

AWDIA0395ZZ

A

B

Continuity

Connector

Terminal

Connector

Terminal

B77

11

C17

2

Yes

12

4

A

—

Continuity

Connector

Terminal

B77

11

Ground

No

12

AWDIA0396ZZ

DLN-236

< DTC/CIRCUIT DIAGNOSIS >

[REAR FINAL DRIVE: M226 (ELD) ]

C1203 ABS SYSTEM

C1203 ABS SYSTEM

Description

INFOID:0000000006179608

The differential lock control unit and the ABS actuator and electric unit (control unit) are in communication via

the CAN communication network. Vehicle speed and wheel slippage information is used by the differential lock

control unit to determine if conditions are met to actuate the differential lock solenoid. 

DTC Logic

INFOID:0000000006179609

DTC

Display contents of CONSULT-III

DTC Detection Condition

Action to take

C1203

ABS SYSTEM
[C1203]

A malfunction related to wheel speed sensors has been 
detected by the ABS actuator and electric unit (control 
unit). 

Check for proper ABS oper-
ation. Refer to 

BRC-24, 

"CONSULT-III Function 
(ABS)"

.

LOCK INDICATOR LAMP

DLN-237

< DTC/CIRCUIT DIAGNOSIS >

[REAR FINAL DRIVE: M226 (ELD) ]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

LOCK INDICATOR LAMP

Description

INFOID:0000000006179610

The DIFF LOCK indicator lamp has power available to it any time the ignition switch is in the ON or START

position. The differential lock control unit supplies ground to activate the DIFF LOCK indicator lamp. The DIFF

LOCK indicator lamp will go through a prove out at initial key ON. The DIFF LOCK will flash while the differen-

tial lock system is activating or while waiting for conditions to be met to activate. Once the differential lock has

been engaged, the DIFF LOCK indicator lamp will remain ON. For more information about the DIFF LOCK

indicator lamp, refer to the Owner’s Manual. 

Diagnosis Procedure

INFOID:0000000006179611

Regarding Wiring Diagram information, refer to 

DLN-240, "Wiring Diagram"

.

1.

CHECK DIFF LOCK INDICATOR LAMP OPERATION

1. Turn the ignition switch ON.

2. Observe the DIFF LOCK indicator lamp.

Is the inspection result normal?

YES

>> DIFF LOCK indicator lamp is operating normally.

NO, ALWAYS ON>> Perform self diagnostics on differential lock control unit. Refer to 

DLN-216, "CONSULT-

III Function (DIFF LOCK)"

.

NO, ALWAYS OFF>>GO TO 2.

2.

CHECK DIFFERENTIAL LOCK CONTROL UNIT POWER AND GROUND SUPPLY

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

DLN-219, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace malfunctioning component. 

3.

CHECK HARNESS BETWEEN DIFFERENTIAL LOCK CONTROL UNIT AND COMBINATION METER

1. Turn ignition switch OFF.

2. Disconnect differential lock control unit connector and combina-

tion meter connector.

3. Check continuity between differential lock control unit connector

B77 (A) terminal 21 and combination meter connector M24 (B)

terminal 14.

4. Check continuity between differential lock control unit connector

B77 (A) terminal 21 and ground.

Is the inspection result normal?

YES

 >> Check DIFF LOCK indicator lamp bulb and power supply. Refer to 

DLN-210, "Work Flow"

.

NO

>> Repair harness or connector.

Ignition switch ON

Indicator prove out

Differential lock control unit

Combination meter

Continuity

Connector

Terminal

Connector

Terminal

B77

21

M24

14

Yes

Differential lock control unit

—

Continuity

Connector

Terminal

B77

21

Ground

Yes

AWDIA0397ZZ

DLN-238

< ECU DIAGNOSIS INFORMATION >

[REAR FINAL DRIVE: M226 (ELD) ]

DIFFERENTIAL LOCK CONTROL UNIT

ECU DIAGNOSIS INFORMATION

DIFFERENTIAL LOCK CONTROL UNIT

Reference Value

INFOID:0000000006179612

DIFFERENTIAL LOCK CONTROL UNIT TERMINAL CONNECTOR LAYOUT

Data are reference value and are measured between each terminal and ground.

CAUTION:

When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminals.

SDIA2573E

Terminal No.

(Wire color)

Description

Condition

Voltage (V) (Ap-

prox.)

+

-

Signal name

Input/

Output

1

(L)

Ground

Ign power supply

Input

Ignition ON or START

Battery voltage

2

(L)

Ground

Ign power supply

Input

Ignition ON or START

Battery voltage

3

(B)

Ground

Ground

Input

Ignition ON

Less than 0.2V

4

(P)

–

CAN-L

–

–

5

(L)

–

CAN-H

–

–

9

(G)

Ground

Differential lock mode switch 
(ON)

Input

Differential lock mode switch: ON

Battery voltage

Differential lock mode switch: OFF

0V

10

(B)

Ground

Ground

Input

Ignition ON

Less than 0.2V

11

(V)

Ground

Differential lock solenoid 
(LO)

Output

Differential lock mode switch: ON

0V

Differential lock mode switch: OFF

Battery voltage

12

(Y)

Ground

Differential lock solenoid 
(HIGH)

Output

Differential lock mode switch: ON

0V

Differential lock mode switch: OFF

Battery voltage

13

(G/W)

–

K-LINE

–

–

–

15

(Y/R)

Ground

Battery power supply
(Memory back-up)

Input

Ignition OFF

Battery voltage

20

(W/R)

Ground

Differential lock position 
switch

Input

Differential lock mode switch: ON
(DIFF LOCK indicator lamp: ON)

0V

Differential lock mode switch: OFF
(DIFF LOCK indicator lamp: OFF)

Battery voltage

21

(L)

Ground

DIFF LOCK indicator lamp

Output

DIFF LOCK indicator lamp: ON

0V

DIFF LOCK indicator lamp: OFF

Battery voltage

22

(O)

Ground

Differential lock mode switch 
(OFF)

Input

Differential lock mode switch: ON

0V

Differential lock mode switch: OFF

Battery voltage