W/Harness Inspection

Engine

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

Ground Circuit inspection

1. Ignition "OFF"
2. Disconnect ECTS connector
3. Measure resistance between terminals 3 of the sensor harness connector and chassis ground

Specification : Approx. 0 Ohms




4. Is resistance within the specification?






Signal Circuit Inspection

1. Check for short to battery in signal harness
1. Disconnect ECM connector.
2. Ignition "ON" & Engine "OFF"
3. Measure voltage between terminal 1 of the sensor harness connector and chassis ground

Specification : Approx. 0 V




4. Is voltage within the specification?





2. Check for open in signal harness
1. Ignition "OFF"
2. Measure voltage between terminal 1 of the sensor harness connector and 15 of the ECM harness connector

Specification : Approx. 0 Ohms




3. Is resistance within the specification?






Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness(es) 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?