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 then go to "Verification of Vehicle Repair" procedure.
	▶ Go to next step.

IG "ON".

Measure voltage between power terminal of the PCM(ECM) harness connector and chassis ground.

Is the measured value within specifications?

	▶ Go to "Ground Circuit Inspection" procedure.
	▶ Repair open or short in power circuit between battery and the PCM(ECM) harness connector and then, go to "Verification of vehicle Repair".

IG "OFF".

Disconnect PCM(ECM) connector.

Measure resistance between ground terminal of the PCM(ECM) harness connector and chassis ground.

Is the measured value within specifications?

	▶ Go to "Signal Circuit Inspection" procedure.
	▶ Repair open or short in ground circuit between the PCM(ECM) harness connector and and chassis ground and then, go to "Verification of vehicle Repair".

IG "OFF".

Disconnect HECU and PCM(ECM) connector.

Measure resistance between C-CAN HIGH terminal (LOW terminal) of the HECU harness connector and C-CAN HIGH terminal (LOW terminal) of the PCM(ECM) harness connector.

Is the measured value within specifications?

	▶ Go to "Component inspection" procedure.
	▶ Repair open in C-CAN BUS line between HECU harness connector and PCM(ECM) harness connector and then go to "Verification of Vehicle Repair" procedure.