DTC Troubleshooting: 13

DTC 13:  An Open in the Evaporator Temperature Sensor Circuit

1.Disconnect the evaporator temperature sensor 2P connector.

2.Measure the resistance between the No. 1 and No. 2 terminals of the  evaporator temperature sensor.

 

Is the resistance within the specifications shown on the graph?


YES - Go to 3.


NO - Replace   the   evaporator   temperature   sensor.n


3.Disconnect the negative cable from the battery.

4.Disconnect ECM/PCM connector E (31P).

5.Check for continuity between the following terminals of ECM/PCM conector E (31P) and the evaporator temperature sensor 2P connector.

(31P): 2P: 
No. 4 No. 2 
No. 12 No. 1 

 

Is there continuity?


YES - Go to 6.


NO - Repair any open in the wire(s) between the  ECM/ PCM and   the   evaporator   temperature   sensor.n


6.Disconnect climate control unit connector B (16P).

7.Check for continuity between the No. 13 terminal of climate control unit connector B (16P) and the No. 1 terminal of the evaporator temperature sensor 2P connector.

 

Is there continuity?


YES - Go to 8.


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


8.Reconnect ECM/PCM connector E (31P).

9.Turn the ignition switch ON (II).

10.Measure the voltage between the No.12 terminal of ECM/PCM connector E (31P) and body ground with the ECM/PCM connectors connected.

 

Is there about 5 V?


YES - Check for loose wires or poor connections at ECM/PCM connector E (31P), climate control unit connector B (16P) 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 - Check for loose wires or poor connections at ECM/PCM connector E (31P), climate control unit connector B (16P) and at the evaporator temperature sensor 2P connector. If the connections are good, substitute a known-good ECM/PCM, and recheck. If the symptom/indication goes away, replace the original  ECM/ PCM.n