DTC Troubleshooting: 14

DTC 14:  An Open in the Evaporator Temperature Sensor Circuit

1.Remove the evaporator temperature sensor.

2.Measure the resistance between the No. 1 and No. 2 terminals of the  evaporator temperature sensor.
*Dip the sensor in ice water, and measure resistance. Then pour hot water on the sensor, and check for change in resistance.

 

Is the resistance within the specifications shown on the graph?


YES - Go to 3.


NO - Replace the  evaporator temperature sensor.n


3.Disconnect the climate control unit 30P connector.

4.Check for continuity between the No. 3 terminal of the climate control unit 30P connector and the No. 2 terminal of the evaporator temperature sensor 2P connector.

 

Is there continuity?


YES - Go to 5.


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

5.Check for continuity between the No. 2 terminal of the climate control unit 30P connector and the No. 1 terminal of the evaporator 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 evaporator 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  evaporator temperature sensor.n