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 indication: Indicated

POSSIBLE CAUSE

•  Differential oil temperature sensor malfunction

•  Open circuit, or short to power or ground between 4WD CM terminal A and differential oil temperature sensor terminal A

•  Open circuit or short to power between 4WD CM terminal C and differential oil temperature sensor terminal B

•  4WD CM malfunction

•  Poor connection of connectors (female terminals)

SYSTEM WIRING DIAGRAM

Diagnostic procedure

STEP	INSPECTION		ACTION
1	INSPECT DIFFERENTIAL OIL TEMPERATURE SENSOR CONDITION • Inspect the differential oil temperature sensor. (See DIFFERENTIAL OIL TEMPERATURE SENSOR INSPECTION.) • Is the differential oil temperature sensor normal?	Yes	Go to the next step.
1		No	Replace differential oil temperature sensor, then go to Step 7. (See DIFFERENTIAL OIL TEMPERATURE SENSOR REMOVAL/INSTALLATION.)
2	INSPECT 4WD CM TO DIFFERENTIAL OIL TEMPERATURE SENSOR FOR OPEN CIRCUIT • Switch the ignition off. • Disconnect 4WD CM connector. • Disconnect differential oil temperature sensor connector. • Inspect for continuity between 4WD CM terminal A and differential oil temperature sensor terminal A. • Is there continuity?	Yes	Go to the next step.
2		No	Refer to the wiring diagram and verify if there is a common connector between 4WD control module terminal A and differential oil temperature sensor terminal A. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 7.
3	INSPECT 4WD CM TO DIFFERENTIAL OIL TEMPERATURE SENSOR FOR SHORT TO POWER • Verify that the 4WD CM connector and differential oil temperature sensor connector are disconnected. • Inspect voltage between 4WD CM terminal A and body ground. • Is voltage B+?	Yes	Refer to the wiring diagram and verify if there is a common connector between 4WD control module terminal A and differential oil temperature sensor terminal A. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to power supply. Go to Step 7.
3		No	Go to the next step.
4	INSPECT 4WD CM TO DIFFERENTIAL OIL TEMPERATURE SENSOR FOR SHORT TO GROUND • Verify that the 4WD CM connector and differential oil temperature sensor connector are disconnected. • Inspect for continuity between 4WD CM terminal A and body ground. • Is there continuity?	Yes	If there is a common connector: Refer to the wiring diagram and verify if there is a common connector between 4WD control module terminal A and differential oil temperature sensor terminal A. • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. Go to Step 7.
4		No	Go to the next step.
5	INSPECT 4WD CM TO DIFFERENTIAL OIL TEMPERATURE SENSOR FOR OPEN CIRCUIT • Verify that the 4WD CM connector and differential oil temperature sensor connector are disconnected. • Inspect for continuity between 4WD CM terminal C and differential oil temperature sensor terminal B. • Is there continuity?	Yes	Go to the next step.
5		No	Refer to the wiring diagram and verify if there is a common connector between 4WD control module terminal C and differential oil temperature sensor terminal B. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 7.
6	INSPECT 4WD CM TO DIFFERENTIAL OIL TEMPERATURE SENSOR FOR SHORT TO POWER • Verify that the 4WD CM connector and differential oil temperature sensor connector are disconnected. • Inspect voltage between 4WD CM terminal C and body ground. • Is voltage B+?	Yes	Refer to the wiring diagram and verify if there is a common connector between 4WD control module terminal C and differential oil temperature sensor terminal B. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to power supply. Go to the next step.
6		No	Go to the next step.
7	VERIFY TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Clear DTC from memory. (See CLEARING DTC [ELECTRONIC 4WD CONTROL SYSTEM].) • Drive vehicle. • Using the M-MDS, perform the 4WD control module DTC inspection. (See DTC INSPECTION [ELECTRONIC 4WD CONTROL SYSTEM].) • Is the same DTC present?	Yes	Replace 4WD CM, then go to the 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. (See DTC TABLE [ELECTRONIC 4WD CONTROL SYSTEM].)
8		No	Troubleshooting completed.

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 indication: Indicated
POSSIBLE CAUSE		• Differential oil temperature sensor malfunction • Open circuit, or short to power or ground between 4WD CM terminal A and differential oil temperature sensor terminal A • Open circuit or short to power between 4WD CM terminal C and differential oil temperature sensor terminal B • 4WD CM malfunction • Poor connection of connectors (female terminals)
SYSTEM WIRING DIAGRAM