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 "Power Circuit Inspection" procedure.

IG "OFF" and disconnect Instrument cluster connector.

IG "ON"

Measure voltage between power supply terminal of instrument cluster harness connector and chassis ground.

Is the measured voltage within specification ?

	▶ Go to "Control Circuit Inspection" procedure.
	▶ Check fuse between battery and instrument cluster for open or blown-off. ▶ Repair open or short to ground in harness, and go to "Verification of Vehicle Repair" procedure.

IG "OFF" and disconnect ECM connector.

IG "ON"

Measure voltage between MIL termimal of ECM harness connector and chassis ground.

Is the measured voltage within specification ?

	▶ Go to "Component Inspection" procedure.
	▶ Check open in Engine warning lamp's filament. ▶ Repair open or short to ground in harness, and go to "Verification of Vehicle Repair" procedure.