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 next step.

IG "ON".

Measure voltage between power terminal of the MDPS 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 the EPS harness connector and battery, and then go to "Verification of vehicle Repair" procedure.

IG "OFF".

Disconnect EPS connector.

Measure resistance between ground terminal of the EPS harness connector and chassis ground.

Is the measured value within specifications?

	▶ Go to "Signal Circuit Inspection" procedure.
	▶ Repair contant resistance or open in ground circuit between the EPS harness connector and chassis ground, and then go to "Verification of Vehicle Repair" procedure.

IG "OFF".

Disconnect HECU and EPS connector.

Measure resistance between CAN High terminal (Low terminal) of the HECU harness connector and CAN High terminal (Low terminal) of the EPS harness connector.

Is the measured value within specifications?

	▶ Go to "Component inspection" procedure.
	▶ Repair open in CAN BUS line between HECU harness connector and MDPS harness connector and then go to "Verification of Vehicle Repair" procedure.