DTC P1888:11/P1888:15 [ELECTRONIC 4WD CONTROL SYSTEM]

id0302a6200600

DTC P1888:11
Differential oil temperature sensor
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
•  Refer to “Fail-safe function table”. (See DTC TABLE [ELECTRONIC 4WD CONTROL SYSTEM].)
POSSIBLE CAUSE
•  Differential oil temperature sensor malfunction
•  Open or short to power or ground circuit in wiring harness between 4WD control module terminal A and differential oil temperature sensor terminal A
•  Open or short to power circuit in wiring harness between 4WD control module terminal C and differential oil temperature sensor terminal B
•  4WD control module malfunction
•  Poor connection at each connector

Diagnostic Procedure

STEP

INSPECTION

ACTION
1
INSPECT DIFFERENTIAL OIL TEMPERATURE SENSOR
•  Inspect the differential oil temperature sensor.
•  Is there any malfunction?
Yes
Replace the differential oil temperature sensor, then go to Step 7.
(See DIFFERENTIAL OIL TEMPERATURE SENSOR REMOVAL/INSTALLATION.)
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.
•  Disconnect the differential oil temperature sensor connector.
•  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.
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
•  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.
No
Go to next step.
4
INSPECT DIFFERENTIAL OIL TEMPERATURE SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND
•  Disconnect the 4WD control module connector.
•  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.
No
Go to the next step.
5
INSPECT DIFFERENTIAL OIL TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT
•  Switch the ignition OFF.
•  Disconnect the 4WD control module connector.
•  Disconnect the differential oil temperature sensor connector.
•  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.
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
•  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.
No
Go to next step.
7
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Using the M-MDS, clear the DTC from the 4WD control module.
•  Drive the vehicle.
•  Using the M-MDS, perform the 4WD control module DTC inspection.
•  Is the same DTC present?
Yes
Replace the 4WD control module, then go to the next step.
(See 4WD CONTROL MODULE REMOVAL/INSTALLATION.)
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 [ELECTRONIC 4WD CONTROL SYSTEM].)
No
DTC troubleshooting completed.