Nissan Titan. Instruction — part 163
DLN-224
< DTC/CIRCUIT DIAGNOSIS >
[REAR FINAL DRIVE: M226 (ELD) ]
P1839 POSITION SWITCH ON
P1839 POSITION SWITCH ON
Description
INFOID:0000000009886122
The differential lock position switch sends a signal to the differential lock control module when the differential
lock is engaged. The differential lock control module monitors the left and right rear wheel speed sensor sig-
nals to determine wheel slippage. When the differential lock is engaged the left and right rear wheel speed
sensor signals should match.
DTC Logic
INFOID:0000000009886123
Diagnosis Procedure
INFOID:0000000009886124
Regarding Wiring Diagram information, refer to
1.
CHECK DIFFERENTIAL LOCK POSITION SWITCH SIGNAL
1. Start engine.
2. Select “D-LOCK POS SW SIG” of DIFF LOCK data monitor.
3. Activate the differential lock according to the directions listed in the table and monitor the display value.
Is the inspection result normal?
YES
>> Differential lock position switch is operating normally.
NO
>> GO TO 2.
2.
CHECK DIFFERENTIAL LOCK POSITION SWITCH
1. Disconnect differential lock position switch harness connector C16.
2. Turn ignition switch ON.
3. Select “D-LOCK POS SW SIG” of DIFF LOCK data monitor.
4. Monitor the display value while connecting and disconnecting a jumper wire between differential lock posi-
tion switch terminals 1 and 3.
Is the inspection result normal?
YES
>> Check the mechanical operation of the differential lock. Replace the differential lock position
switch. Refer to
DLN-252, "Removal and Installation"
.
NO
>> GO TO 3.
3.
CHECK DIFFERENTIAL LOCK POSITION SWITCH VOLTAGE
Check voltage between differential lock position switch connector C16 terminal 1 and ground.
DTC
Display contents of CONSULT
DTC Detection Condition
Action to take
P1839
POSI SW ON
[P1839]
The differential lock position switch is ON indicating the
differential is locked, but the differential lock control mod-
ule detects a difference between left and right rear wheel
speeds.
Inspect the differential lock
position switch. Refer to
DLN-224, "Diagnosis Proce-
dure"
.
Monitor item
Condition
Display value
D-LOCK POS SW SIG
• Vehicle stopped
• Engine running
• VDC OFF switch (if
equipped): ON
• 4WD shift switch: 4LO
Differential lock mode switch: ON
(DIFF LOCK indicator lamp: ON)
ON
Differential lock mode switch: OFF
(DIFF LOCK indicator lamp: OFF)
OFF
Monitor item
Condition
Display value
D-LOCK POS SW SIG
Jumper wire connected
ON
Jumper wire disconnected
OFF
P1839 POSITION SWITCH ON
DLN-225
< DTC/CIRCUIT DIAGNOSIS >
[REAR FINAL DRIVE: M226 (ELD) ]
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Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 5.
4.
CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between differential lock position switch harness connector C16 terminal 3 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.
5.
CHECK HARNESS BETWEEN DIFFERENTIAL LOCK CONTROL UNIT AND DIFFERENTIAL LOCK PO-
SITION SWITCH
1. Turn ignition switch OFF.
2. Disconnect differential lock control unit harness connector B77.
3. Check continuity between differential lock control unit harness connector B77 terminal 20 and differential
lock position switch harness connector C16 terminal 1.
4. Check continuity between differential lock control unit harness connector B77 terminal 20 and ground.
Is the inspection result normal?
YES >> Replace differential lock control unit. Refer to
DLN-251, "Removal and Installation"
.
NO
>> Repair harness or connector.
(+)
(-)
Voltage (Approx.)
Connector
Terminal
C16
1
Ground
Battery voltage
Connector
Terminal
—
Continuity
C16
3
Ground
Yes
Connector
Terminal
Connector
Terminal
Continuity
B77
20
C16
1
Yes
Connector
Terminal
Ground
No
B77
20
DLN-226
< DTC/CIRCUIT DIAGNOSIS >
[REAR FINAL DRIVE: M226 (ELD) ]
P1844 RELAY
P1844 RELAY
Description
INFOID:0000000009886125
The differential lock solenoid relay is an integral part of the differential lock control unit.
DTC Logic
INFOID:0000000009886126
Diagnosis Procedure
INFOID:0000000009886127
Regarding Wiring Diagram information, refer to
1.
CHECK DIFFERENTIAL LOCK CONTROL UNIT POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect differential lock control unit connector.
3. Turn ignition switch ON.
4. Check voltage between differential lock control unit connector
B77 terminals 1, 2, 15 and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Check fuse. Repair harness or connectors.
2.
CHECK DIFFERENTIAL LOCK CONTROL UNIT GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between differential lock control unit connector
B77 terminals 3, 10 and ground.
Is the inspection result normal?
YES
>> Power and ground supply is normal.
NO
>> Repair harness or connectors.
DTC
Display contents of CONSULT
DTC Detection Condition
Action to take
P1844
RELAY
[P1844]
The differential lock control unit relay monitor did not de-
tect expected voltage at the relay.
Inspect differential lock con-
trol unit relay power and
ground supply circuit. Refer
to
(+)
(-)
Voltage (Approx.)
Connector
Terminal
B77
1
Ground
Battery voltage
2
15
SDIA2563E
Connector
Terminal
—
Continuity
B77
3
Ground
Yes
10
SDIA2564E
P1847 SOLENOID CIRCUIT
DLN-227
< DTC/CIRCUIT DIAGNOSIS >
[REAR FINAL DRIVE: M226 (ELD) ]
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P1847 SOLENOID CIRCUIT
Description
INFOID:0000000009886128
Replace the differential lock control unit if this DTC is displayed. Refer to
DLN-251, "Removal and Installation"
.
DTC Logic
INFOID:0000000009886129
DTC
Display contents of CONSULT
DTC Detection Condition
Action to take
P1847
SOL CIRCUIT
[P1847]
A malfunction is detected in the differential lock control
unit internal circuit.
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