DTC P1888:11/P1888:15 [ELECTRONIC 4WD CONTROL SYSTEM]

id0302a6200600

DTC P1888:11
Differential oil temperature sensor circuit
DTC P1888:15
DETECTION CONDITION
•  P1888:11
―  Short to ground is detected in differential oil temperature sensor circuit
•  P1888:15
―  Short to battery or open circuit is detected in differential oil temperature sensor circuit
FAIL-SAFE FUNCTION
•  Control disabled.
•  4WD warning light: Illuminated
POSSIBLE CAUSE
•  Differential oil temperature sensor malfunction
•  Open circuit, or short to power or ground between 4WD control module terminal A and differential oil temperature sensor terminal A
•  Open circuit or short to power between 4WD control module terminal C and differential oil temperature sensor terminal B
•  4WD control module malfunction
•  Poor connection of connectors (female terminals)
SYSTEM WIRING DIAGRAM

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT DIFFERENTIAL OIL TEMPERATURE SENSOR CONDITION
•  Disconnect differential oil temperature sensor connector.
•  Inspect the differential oil temperature sensor.
•  Is the differential oil temperature sensor normal?
Yes
Go to next step.
No
Replace differential oil temperature sensor, then go to Step 7.
2
INSPECT 4WD CONTROL MODULE TO DIFFERENTIAL OIL TEMPERATURE SENSOR FOR OPEN CIRCUIT
•  Disconnect 4WD control module connector.
•  Inspect for continuity between 4WD control module terminal A and differential oil temperature sensor terminal A.
•  Is there continuity?
Yes
Go to next step.
No
Repair or replace harness for open circuit between 4WD control module and differential oil temperature sensor, then go to Step 7.
3
INSPECT 4WD CONTROL MODULE TO DIFFERENTIAL OIL TEMPERATURE SENSOR FOR SHORT TO POWER
•  Inspect voltage between 4WD control module terminal A and ground.
•  Is voltage B+?
Yes
Repair or replace harness for short to power between 4WD control module and differential oil temperature sensor, then go to Step 7.
No
Go to next step.
4
INSPECT 4WD CONTROL MODULE TO DIFFERENTIAL OIL TEMPERATURE SENSOR FOR SHORT TO GROUND
•  Inspect for continuity between 4WD control module terminal A and ground.
•  Is there continuity?
Yes
Repair or replace harness for short to ground between 4WD control module and differential oil temperature sensor, then go to Step 7.
No
Go to next step.
5
INSPECT 4WD CONTROL MODULE TO DIFFERENTIAL OIL TEMPERATURE SENSOR FOR OPEN CIRCUIT
•  Inspect for continuity between 4WD control module terminal C and differential oil temperature sensor terminal B.
•  Is there continuity?
Yes
Go to next step.
No
Repair or replace harness for open circuit between 4WD control module and differential oil temperature sensor, then go to Step 7.
6
INSPECT 4WD CONTROL MODULE TO DIFFERENTIAL OIL TEMPERATURE SENSOR FOR SHORT TO POWER
•  Inspect voltage between 4WD control module terminal C and ground.
•  Is voltage B+?
Yes
Repair or replace harness for short to power between 4WD control module and differential oil temperature sensor, then go to next step.
No
Go to next step.
7
VERIFY TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear DTC from memory.
•  Drive vehicle.
•  Using the M-MDS, perform the 4WD control module DTC inspection.
•  Is the same DTC present?
Yes
Replace 4WD control module, then go to next step.
No
Go to next step.
8
VERIFY AFTER REPAIR PROCEDURE
•  Is there any other DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.