C1252

DTC C1252: Coupling Assembly Circuit Open

Wiring Diagram










DTC Detecting Condition and Trouble Area






DTC Confirmation Procedure

1) Clear DTC using scan tool.
2) Start engine and select 2WD/4WD switch to "LOCK" position.
3) Keep engine running at 2000 rpm for 10 seconds. or more.
4) Stop engine and check DTC.

Troubleshooting

1.
Was "4WD control system check" performed?
YES -
Go to Step 2.
NO -
Go to 4WD Control System Check 4WD Control System Check.

2. Coupling assembly circuit check

Disconnect coupling assembly connector "L102" with ignition switch turned OFF.
Check for proper connection to "L102-1" and "L102-2" terminals of coupling assembly connector.
If connection is OK, measure voltage between "L102-1" terminal of coupling assembly connector and vehicle body ground.

Is it 10 - 14 V?
YES -
Go to Step 3.
NO -
Go to Step 6.

3. Coupling assembly ground circuit check

Measure resistance between "L102-2" terminal of coupling assembly connector and vehicle body ground with ignition switch turned OFF.

Is resistance below 5 ohms?
YES -
Go to Step 4.
NO -
Go to Step 5.

4. Coupling assembly check

Check coupling assembly referring to Testing and Inspection Coupling Assembly Inspection.

Is it in good condition?
YES -
Substitute a known-good 4WD control module and recheck.
NO -
Replace coupling assembly.

5. Coupling assembly circuit check

Disconnect connector from 4WD control module connector "G26" with ignition switch turned OFF.
Check for proper connection to "G26-2" and "G26-3" terminals of 4WD control module connector.
If connection is OK, measure resistance between "G26-2" terminal of 4WD control module connector and vehicle body ground.

Is resistance below 5 ohms?
YES -
"GRN" wire is open or high resistance circuit.
NO -
Substitute a known-good 4WD control module and recheck.

6. Coupling assembly circuit check

Disconnect connector from 4WD control module connector "G26" with ignition switch turned OFF.
Check for proper connection to "G26-3" terminal of 4WD control module connector.
If connection is OK, measure resistance between "G26-3" terminal of 4WD control module connector and "L102-1" terminal of coupling assembly connector.

Is resistance below 5 ohms?
YES -
Substitute a known-good 4WD control module and recheck.
NO -
"YEL" wire is open or high resistance circuit.