Nissan Titan. Manual — part 165
DLN-232
< DTC/CIRCUIT DIAGNOSIS >
[REAR FINAL DRIVE: M226 (ELD) ]
P1850 SOLENOID CURRENT
P1850 SOLENOID CURRENT
Description
INFOID:0000000009886136
The differential lock control unit supplies power and ground to the differential lock solenoid via the differential
lock solenoid relay (integral to the differential lock control unit).
DTC Logic
INFOID:0000000009886137
Diagnosis Procedure
INFOID:0000000009886138
Regarding Wiring Diagram information, refer to
1.
CHECK DIFFERENTIAL SOLENOID CONTROL
1. Start engine.
2. Using CONSULT, select “RELAY ON”, “RELAY MTR”, “SOL MTR” of DIFF LOCK data monitor.
3. Observe the display values while operating the differential lock system.
Is the inspection result normal?
YES
>> Differential lock solenoid control system is operating normally.
NO
>> GO TO 2.
2.
CHECK DIFFERENTIAL LOCK SOLENOID RESISTANCE
1. Turn ignition switch OFF.
2. Disconnect differential lock solenoid connector.
3. Check resistance between differential lock solenoid terminals 2
and 4.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Replace differential lock solenoid.
3.
CHECK DIFFERENTIAL LOCK SOLENOID OPERATION
DTC
Display contents of CONSULT
DTC Detection Condition
Action to take
P1850
SOL CURRENT
[P1850]
The differential lock relay does not switch to OFF or there
is a short to power in the harness.
Inspect the differential lock
solenoid. Refer to
.
Monitor item
Condition
Differential lock mode switch
Display value
RELAY ON
• Vehicle stopped
• Engine running
• VDC OFF switch (if
equipped): ON
• 4WD shift switch: 4LO
ON
ON
OFF
OFF
RELAY MTR
ON
ON
OFF
OFF
SOL MTR
ON
ON
OFF
OFF
2 - 4
: Approx. 3.4
Ω
AWDIA0394ZZ
P1850 SOLENOID CURRENT
DLN-233
< DTC/CIRCUIT DIAGNOSIS >
[REAR FINAL DRIVE: M226 (ELD) ]
C
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A
B
DLN
N
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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-251, "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-234
< DTC/CIRCUIT DIAGNOSIS >
[REAR FINAL DRIVE: M226 (ELD) ]
C1203 ABS SYSTEM
C1203 ABS SYSTEM
Description
INFOID:0000000009886139
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:0000000009886140
DTC
Display contents of CONSULT
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
LOCK INDICATOR LAMP
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
LOCK INDICATOR LAMP
Description
INFOID:0000000009886141
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:0000000009886142
Regarding Wiring Diagram information, refer to
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
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-217, "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
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
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