Nissan Titan. Manual - part 163
DLN-224
< DTC/CIRCUIT DIAGNOSIS >
[REAR FINAL DRIVE: M226 (ELD) ]
P1839 POSITION SWITCH ON
P1839 POSITION SWITCH ON
Description
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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