DTC 1

DTC 1: An Open in the In-car Temperature Sensor Circuit

1. Remove the in-car temperature sensor.




2. Measure the resistance between the No. 1 and No. 2 terminals of the in-car temperature sensor.
*Check for a change in resistance by heating or cooling the sensor with a hair dryer.

*Is the resistance within the specifications shown on the graph?

YES - Go to step 3.

NO - Replace the in-car temperature sensor.

3. Disconnect the climate control unit 30P connector.




4. Check for continuity between the No. 8 terminal of the climate control unit 30P connector and the No. 1 terminal of the in-car temperature sensor 2P connector.

Is there continuity?

YES - Go to step 5.

NO - Repair open in the wire between the climate control unit and the in-car temperature sensor.




5. Check for continuity between the No. 2 terminal of the climate control unit 30P connector and the No. 2 terminal of the in-car temperature sensor 2P connector.

Is there continuity?

YES - Check for loose wires or poor connections at the climate control unit 30P connector and at the in-car temperature sensor 2P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control.

NO - Repair open in the wire between the climate control unit and the in-car temperature sensor.