W/Harness Inspection

Engine Control
P0118 Engine Coolant Temperature Circuit High Input - Inspection/Repair:_:W/Harness Inspection

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?






Signal Circuit Inspection

Check voltage
1. IG "OFF" and disconnect ECTS connector.
2. IG "ON"
3. Measure voltage between signal terminal of ECTS harness connector and chassis ground.

Specification :Approx. 3.3V




4. Is the measured voltage within specification ?





Check open in harness
1. IG "OFF" and disconnect ECTS connector and PCM connector.
2. Measure resistance between signal terminal of ECTS harness connector and ECTS signal terminal of PCM harness connector.

Specification :below 1Ohms




3. Is the measured resistance within specification ?






Ground Circuit Inspection

Check open in harness
1. IG "OFF" and disconnect ECTS connector and then IG "ON".
2. Measure voltage between signal terminal of ECTS harness connector and chassis ground.(Measurement "A")
3. Measure voltage between signal and ground terminals of ECTS harness connector.(Measurement "B")

Specification :Voltage difference between measurement "A" and "B" is below 200mV.








4. Is the measured voltage within specification ?