## DTC Troubleshooting: 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 drier. *Is the resistance within the specifications shown on the graph? YES - Go to 3. NO - Replace the in-car temperature sensor.n

3. | Disconnect climate control unit connectors A (12P) and B (16P).

4. | Check for continuity between the No. 11 terminal of climate control unit connector A (12P) and the No. 2 terminal of the in-car temperature sensor 2P connector. Is there continuity? YES - Go to 5. NO - Repair open in the wire between the climate control unit and the in-car temperature sensor.n

5. | Check for continuity between the No. 5 terminal of climate control unit connector B (16P) and the No. 1 terminal of the in-car temperature sensor 2P connector. Is there continuity? YES - Check for loose wires or poor connections at climate control unit connectors A (12P) and B (16P) 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 unit.n NO - Repair open in the wire between the climate control unit and the in-car temperature sensor.n