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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. (See Clearing DTCs Procedures) • 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.