## ECT Sensor Circuit Troubleshooting

1. | Check the malfunction indicator lamp (MIL). Does the malfunction indicator lamp come on? YES - Refer to the fuel and emissions section.n NO - Go to 2.

2. | Turn the ignition switch OFF.

3. | Disconnect the ECM sensor 2P connector.

4. | Disconnect climate control unit connector A (12P).

5. | Turn the ignition switch ON (II). Measure the voltage between the No.12 terminal of climate control unit connector A (12P) and body ground. Is there about 5 V? YES - Check for loose wires or poor connections at climate control unit connector A (12P) and at the ECT 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 - Repir open in the wire between the climate control unit and the ECT sensor.n