DTC C1252 / C1253
Precautions: Precautions for Diagnosing Trouble · Precautions for Driveline / Axle · General safety (00)
DTC Detecting Condition and Trouble Area
| DTC detecting condition | Trouble area |
|---|---|
|
C1252: Coupling Assembly Open Rear drive coupling unit circuit is open. |
•Rear drive coupling unit
•Rear drive coupling unit circuit •4WD control module |
|
C1253: Coupling Assembly Short Rear drive coupling unit circuit is shorted to power supply or ground. |
Circuit Diagram
| [A]: | 4WD control module connector (View: [a]) | A2: | Rear drive coupling unit signal circuit | 2. | 4WD control module |
| A1: | Rear drive coupling unit power supply circuit | 1. | Rear drive coupling unit |
DTC Confirmation Procedure
1)Set ignition “ON” for 1 minute.
DTC Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Was “4WD control system check” performed?
|
Go to Step 2.
|
Go to 4WD Control System Check.
|
| 2 |
Rear drive coupling unit power supply circuit and rear drive coupling unit signal circuit check
1)Disconnect “L14” and rear drive coupling unit connectors with ignition “OFF”.
2)Check for proper connection to 4WD control module and rear drive coupling unit.
3)If connections are OK, check the following points.
•Resistance of “A1” and “A2” circuits: less than 1 Ω
•Resistance between “A1” circuit and ground: infinity •Resistance between “A2” circuit and ground: infinity •Resistance between “A1” circuit terminal and other terminal at rear drive coupling unit connector: infinity •Voltage of “A1” and “A2” circuits: approx. 0 V (When ignition is “ON”) Is check result OK?
|
Go to Step 3.
|
Repair or replace defective wire harness.
|
| 3 |
Rear drive coupling unit check
1)Check rear drive coupling unit.
Is check result OK?
|
Substitute a known-good 4WD control module and recheck DTC.
|
Replace rear drive coupling unit.
|