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 injector connector.

IG "ON".

Measure voltage between power terminal of injector harness connector and chassis ground.

Is the measured voltage within specification ?

	▶ Go to "Control Circuit Inspection" procedure.
	▶ Check open or connection of the fuse connected to injector power supply. ▶ Repair open or short to ground in harness, and go to "Verification of Vehicle Repair' procedure.

IG "OFF" and disconnect injector connector and ECM connector.

Measure resistance between injector control terminal of injector harness connector and chassis ground.

Is the measured resistance within specification ?

	▶ Go to "Check open in harness" as follows.
	▶ Repair short to ground in harness, and go to "Verification of Vehicle Repair" procedure.

IG "OFF" and disconnect injector connector and ECM connector.

Measure resistance between injector control terminal of injector harness connector and injector control terminal of ECM harness connector.

Is the measured resistance within specification ?

	▶ Go to "Component Inspection" procedure.
	▶ Repair open in harness, and go to "Verification of Vehicle Repair" procedure.