ECT Sensor Circuit Troubleshooting
|1.||Check the malfunction indicator lamp (MIL).|
Does the malfunction indicator lamp come on?
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