W/Harness Inspection

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?
YES
1) Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO
1) Go to "Signal Circuit Inspection" procedure.

Signal Circuit Inspection

1. IG "OFF".
2. Disconnect ECTS connector.
3. IG "ON" & ENG "OFF"
4. Measure voltage between terminal 1 of ECTS harness connector and chassis ground.
A. Specification : Approx. 5 V




5. Is the measured voltage within specification?
YES
1) Go to "Ground Circuit Inspection" procedure.
NO
1) Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.

Ground Circuit inspection

1. IG "OFF".
2. Disconnect ECTS connector.
3. IG "ON" & ENG "OFF"
4. Measure voltage between terminal 1 of ECTS harness connector and chassis ground. (A)
5. Measure voltage between terminal 1 and 3 of ECTS harness connector. (B)
A. Specification : "A" - "B" = Below 200 mV




6. Is the measured voltage within specification?
YES
1) Go to "Component Inspection" procedure.
NO
1) Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.