C1251

DTC C1250 / C1251

DTC Detecting Condition and Trouble Area






Circuit Diagram










DTC Confirmation Procedure

1) Clear DTC.
2) Push engine switch to change ignition mode to "ON".
3) Check DTC.

DTC Troubleshooting


1. Was "4WD control system check" performed?
YES
Go to Step 2.
NO
Go to 4WD Control System Check.
2. Coupling air temperature sensor signal circuit and coupling air temperature sensor ground circuit check
Disconnect "L14" and coupling air temperature sensor connectors with ignition mode of keyless push start system in "OFF".
Check for proper terminal connection to "L14" and coupling air temperature sensor connectors.
If connections are OK, check the following points.
Resistance of "A1" and "A2" circuits: less than 1
Resistance between "A1" circuit and ground: infinity
Resistance between "A1" circuit terminal and other terminal at coupling air temperature sensor connector: infinity
Voltage of "A1" circuit: 0 - 1 V (with ignition mode of keyless push start system in "ON")
Are they in good condition?
YES
Go to Step 3.
NO
Repair or replace defective wire harness.
3. Coupling air temperature sensor check
Check coupling air temperature sensor.
Is it in good condition?
YES
Substitute a known-good 4WD control module and recheck DTC.
NO
Replace coupling air temperature sensor.