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 warm water on the sensor, and check for a 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 heater control panel 36P connector.

4.Check for continuity between the No. 7 terminal of the heater control panel 36P 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 heater control panel and the  evaporator temperature sensor.n


5.Check for continuity between the No. 2 terminal of the heater control panel 36P 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 heater control panel 36P connector and at the  evaporator temperature sensor 2P connector. If the connections are good, substitute a known-good heater control panel, and recheck. If the symptom/indication goes away, replace the original heater control panel.n


NO - Repair open in the wire between the heater control panel and the evaporator temperature sensor.n