## 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