DTC P1888

id030200800400

DTC | P1888 | Differential oil temperature sensor circuit
DETECTION CONDITION | • Differential oil temperature sensor voltage monitor circuit detects abnormal input voltage.
POSSIBLE CAUSE | • Differential oil temperature sensor malfunction • 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 • 4WD CM malfunction • Poor connection of connectors (female terminals)

Diagnostic procedure

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