DTC C1250 / C1251
Precautions: Precautions for Diagnosing Trouble · Precautions for Driveline / Axle · General safety (00)
DTC Detecting Condition and Trouble Area
| DTC detecting condition | Trouble area |
|---|---|
|
C1250: Coupling Air Temperature Sensor Open Input signal voltage from rear drive coupling air temperature sensor is higher than specified value for specified time. |
•Rear drive coupling air temperature sensor
•Rear drive coupling air temperature sensor circuit •4WD control module |
|
C1251: Coupling Air Temperature Sensor Short Input signal voltage from rear drive coupling air temperature sensor is lower than specified value for specified time. |
Circuit Diagram
| [A]: | 4WD control module connector (View: [a]) | 1. | Rear drive coupling air temperature sensor |
| A1: | Rear drive coupling air temperature sensor signal circuit | 2. | 4WD control module |
| A2: | Rear drive coupling air temperature sensor ground circuit |
DTC Confirmation Procedure
1)Set ignition “ON”.
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 air temperature sensor signal circuit and rear drive coupling air temperature sensor ground circuit check
1)Disconnect “L14” and rear drive coupling air temperature sensor connectors with ignition “OFF”.
2)Check for proper connection to 4WD control module and rear drive coupling air temperature sensor.
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 “A1” circuit terminal and other terminal at rear drive coupling air temperature sensor connector: infinity •Voltage of “A1” circuit: 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 air temperature sensor check
1)Check rear drive coupling air temperature sensor.
Is check result OK?
|
Substitute a known-good 4WD control module and recheck DTC.
|
Replace rear drive coupling air temperature sensor.
|