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 all connectors (and connections) for looseness, bending, corrosion, contamination, deterioration, and/or damage.

Has a problem been found?

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

Ignition switch "OFF"

Refer to "Shop Manual" and disconnect variable oil pump control solenoid valve connector.

Ignition switch "ON"

Measure the voltage between Pin No. 2 (Power) terminal of variable oil pump control solenoid valve harness connector and chassis ground.

Is the measured value within specification?

	▶ Go to "Control Circuit Inspection" procedure.
	▶ Inspect and repair open or short in circuit, and then go to "Verification of Vehicle Repair" procedure.

Ignition switch "OFF"

Disconnect battery (-) cable.

Refer to "Shop Manual" and disconnect variable oil pump control solenoid valve connector.

Measure the resistance between Pin No. 1 (Control) terminal of variable oil pump control solenoid valve harness connector and chassis ground.

Is the measured value within specification?

	▶ Go to "Component Inspection" procedure.
	▶ Inspect and repair open or short in circuit, and then go to "Verification of Vehicle Repair" procedure.