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.
1		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.
2		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.
3		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.
4		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.
5		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.
6		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.)
7		No	Go to the next step.
8	VERIFY AFTER REPAIR PROCEDURE • Is there any other DTC present?	Yes	Go to applicable DTC inspection.
8		No	Troubleshooting completed.

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)