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.

Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

Has a problem been found?

	▶ Repair as necessary and go to "Verification of vehicle Repair" procedure.
	▶ Go to "Signal Circuit Inspection" procedure.

IG KEY "OFF".

Disconnect ECTS connector.

IG KEY "ON" & ENG "OFF"

Measure voltage between signal terminal of ECTS harness connector and chassis ground.

Is the measured voltage within specification ?

	▶ Go to "Ground Circuit Inspection" procedure.
	▶ Check for open in signal circuit. Repair as necessary and then go to "Verification of Vehicle Repair" procedure.

IG KEY "OFF".

Disconnect IATS connector.

IG KEY "ON" & ENG "OFF"

Measure the voltage between signal terminal of ECTS harness connector and chassis ground.(A)

Measure the voltage between signal and ground terminal of ECTS harness connector and chassis ground.(B)

Is the measured voltage within specification ?

	▶ Go to "Component Inspection" procedure.
	▶ Check for Open in ground circuit. Repair as necessary and then go to "Verification of Vehicle Repair" procedure.