DTC P1888SM2445073
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 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)

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT DIFFERENTIAL OIL TEMPERATURE SENSOR CONDITION
• Disconnect differential oil temperature sensor connector.
• Inspect the differential oil temperature sensor. (See DIFFERENTIAL OIL TEMPERATURE SENSOR INSPECTION.)
• Is the differential oil temperature sensor normal?
Yes
Go to next step.
No
Replace differential oil temperature sensor, then go to Step 7.
2
INSPECT 4WD CM TO DIFFERENTIAL OIL TEMPERATURE SENSOR FOR OPEN CIRCUIT
• Disconnect 4WD CM connector.
• Inspect for continuity between 4WD CM terminal A and differential oil temperature sensor terminal A.
• Is there continuity?
Yes
Go to next step.
No
Repair or replace harness for open circuit between 4WD CM and 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 4WD CM terminal A and ground.
• Is voltage B+?
Yes
Repair or replace harness for short to power between 4WD CM and differential oil temperature sensor, then go to Step 7.
No
Go to next step.
4
INSPECT 4WD CM TO DIFFERENTIAL OIL TEMPERATURE SENSOR FOR SHORT TO GROUND
• Inspect for continuity between 4WD CM terminal A and ground.
• Is there continuity?
Yes
Repair or replace harness for short to ground between 4WD CM and differential oil temperature sensor, then go to Step 7.
No
Go to next step.
5
INSPECT 4WD CM TO DIFFERENTIAL OIL TEMPERATURE SENSOR FOR OPEN CIRCUIT
• Inspect for continuity between 4WD CM terminal C and differential oil temperature sensor terminal B.
• Is there continuity?
Yes
Go to next step.
No
Repair or replace harness for open circuit between 4WD CM and 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 4WD CM terminal C and ground.
• Is voltage B+?
Yes
Repair or replace harness for short to power between 4WD CM and differential oil temperature sensor, then go to next step.
No
Go to next step.
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 4WD CM, then go to next step.
No
Go to next step.
8
VERIFY AFTER REPAIR PROCEDURE
• Is there any other DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.