DTC P1888:11/P1888:15 [4WD CONTROL MODULE]

id0302d2200600

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 light: Illuminated

POSSIBLE CAUSE

•  Differential oil temperature sensor malfunction

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

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

•  4WD control module malfunction

•  Poor connection of connectors (female terminals)

Diagnostic procedure

Step	Inspection		Action
1	INSPECT DIFFERENTIAL OIL TEMPERATURE SENSOR • Inspect the differential oil temperature sensor. (See DIFFERENTIAL OIL TEMPERATURE SENSOR INSPECTION.) • Is there any malfunction?	Yes	Replace the differential oil temperature sensor, then go to Step 7. (See DIFFERENTIAL OIL TEMPERATURE SENSOR REMOVAL/INSTALLATION.)
1		No	Go to the next step.
2	INSPECT DIFFERENTIAL OIL TEMPERATURE SENSOR SIGNAL CIRCUIT FOR OPEN CIRCUIT • Switch the ignition off. • Disconnect the 4WD control module connector. (See 4WD CONTROL MODULE REMOVAL/INSTALLATION.) • Disconnect the differential oil temperature sensor connector. (See COUPLING COMPONENT REMOVAL/INSTALLATION.) • Inspect for continuity between 4WD control module terminal A (wiring harness-side) and differential oil temperature sensor terminal A (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
2		No	Refer to the wiring diagram and verify whether or not 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 DIFFERENTIAL OIL TEMPERATURE SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Verify that the differential oil temperature sensor and 4WD control module connectors are disconnected. • Measure the voltage between 4WD control module terminal A (wiring harness-side) and body ground. • Is the voltage B+?	Yes	Refer to the wiring diagram and verify whether or not 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 next step.
4	INSPECT DIFFERENTIAL OIL TEMPERATURE SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND • Verify that the differential oil temperature sensor and 4WD control module connectors are disconnected. • Inspect for continuity between 4WD control module terminal A (wiring harness-side) and body ground. • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not 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 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 DIFFERENTIAL OIL TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT • Verify that the differential oil temperature sensor and 4WD control module connectors are disconnected. • Inspect for continuity between 4WD control module terminal C (wiring harness-side) and differential oil temperature sensor terminal B (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
5		No	Refer to the wiring diagram and verify whether or not 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 DIFFERENTIAL OIL TEMPERATURE SENSOR GROUND CIRCUIT FOR SHORT TO POWER SUPPLY • Verify that the differential oil temperature sensor and 4WD control module connectors are disconnected. • Measure the voltage between 4WD control module terminal C (wiring harness-side) and body ground. • Is the voltage B+?	Yes	Refer to the wiring diagram and verify whether or not 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 next step.
7	VERIFY DTC TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Using the M-MDS, clear the DTC from the 4WD control module. (See CLEARING DTC [4WD CONTROL MODULE].) • Drive the vehicle. • Using the M-MDS, perform the 4WD control module DTC inspection. (See DTC INSPECTION [4WD CONTROL MODULE].) • Is the same Pending DTC present?	Yes	Replace the 4WD control module, then go to the next step. (See 4WD CONTROL MODULE REMOVAL/INSTALLATION.)
7		No	Go to the next step.
8	VERIFY NO DTC IS PRESENT • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [4WD CONTROL MODULE].)
8	VERIFY NO DTC IS PRESENT • Are any DTCs present?	No	DTC 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 light: Illuminated
POSSIBLE CAUSE		• Differential oil temperature sensor malfunction • Open circuit, or short to power or ground between 4WD control module terminal A and differential oil temperature sensor terminal A • Open circuit or short to power between 4WD control module terminal C and differential oil temperature sensor terminal B • 4WD control module malfunction • Poor connection of connectors (female terminals)