DTC A

DTC indicator A: 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 - Without Navigation System: Go to step 3.
With Navigation System: Go to step 6.

NO - Replace the in-car temperature sensor.

3. Disconnect climate control unit connector B (20P).




4. Check for continuity between the No.16 terminal of climate control unit connector B (20P) and the No.2 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.11 terminal of climate control unit connector B (20P) 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 connector B (20P) 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.

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

6. Disconnect climate control connector B (26P).




7. Check for continuity between the No 17 terminal of climate control unit connector B (26P) and the No.2 terminal of the in-car temperature sensor 2P connector.

Is there continuity?

YES - Go to step 8.

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




8. Check for continuity between the No.1 terminal of climate control unit connector B (26P) 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 connector B (26P) 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.

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