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.

Have any problems been found?

	▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
	▶ Go to " Power Circuit Inspection " procedure.

Engine starts.

Measure the voltage between on/start input terminal of ECM and B terminal of alternator.

Is the measured voltage within specification?

	▶ Repair as necessary and go to "Verification of vehicle Repair" procedure.
	▶ Go to "Check Battery Voltage" procedure.

Engine starts.

Measure the voltage between + terminal of battery and B terminal of alternator.

Is the measured voltage within specification?

	▶ Go to "Component Inspection" as follows.
	▶ Repair open or short in harnesses and go to "Verification of Vehicle Repair".