DTC P1888 [L3 Turbo]

id0302a5800400

DTC

P1888

Differential oil temperature sensor circuit

DETECTION CONDITION

• Differential oil temperature sensor voltage monitor circuit detects abnormal input voltage.

POSSIBLE CAUSE

• Open circuit, or short to battery or GND between 4WD CM terminal A and differential oil temperature sensor terminal A
• Open circuit or short to battery between 4WD CM terminal C and differential oil temperature sensor terminal B
• Differential oil temperature sensor malfunction
4WD CM malfunction
• Poor connection of connectors (female terminals)

Diagnostic procedure

STEP

INSPECTION

ACTION

1
INSPECT DIFFERENTIAL OIL TEMPERATURE SENSOR CONDITION
• Turn ignition key to OFF.
• Disconnect differential oil temperature sensor connector.
• Is it okay?
Yes
Go to next step.
No
Replace differential oil temperature sensor, then go to Step 7.
2
INSPECT 4WD CM TO DIFFERENTIAL OIL TEMPERATURE SENSOR FOR OPEN CIRCUIT
• Disconnect 4WD CM connector.
• Inspect for continuity between 4WD CM 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 CM and differential oil temperature sensor, then go to Step 7.
3
INSPECT 4WD CM TO DIFFERENTIAL OIL TEMPERATURE SENSOR FOR SHORT TO POWER
• Inspect voltage between 4WD CM terminal A and ground.
• Is voltage B+?
Yes
Repair or replace harness for short to power between 4WD CM and differential oil temperature sensor, then go to Step 7.
No
Go to next step.
4
INSPECT 4WD CM TO DIFFERENTIAL OIL TEMPERATURE SENSOR FOR SHORT TO GROUND
• Inspect for continuity between 4WD CM terminal A and ground.
• Is there continuity?
Yes
Repair or replace harness for short to ground between 4WD CM and differential oil temperature sensor, then go to Step 7.
No
Go to next step.
5
INSPECT 4WD CM TO DIFFERENTIAL OIL TEMPERATURE SENSOR FOR OPEN CIRCUIT
• Inspect for continuity between 4WD CM 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 CM and differential oil temperature sensor, then go to Step 7.
6
INSPECT 4WD CM TO DIFFERENTIAL OIL TEMPERATURE SENSOR FOR SHORT TO GROUND
• Inspect voltage between 4WD CM terminal C and ground.
• Is voltage B+?
Yes
Repair or replace harness for short to power between 4WD CM and differential oil temperature sensor, then go to next step.
No
Replace 4WD CM, then go to next step.
7
VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from memory.
• Drive vehicle.
• Is the same DTC present?
Yes
Replace 4WD CM, 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.