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 "Control Circuit Inspection" procedure.

Ignition switch "OFF"

Disconnect battery (-) cable.

Refer to "Shop Manual" and disconnect engine room junction box and ECM/PCM connector.

Measure the resistance between Pin No. 16 (ECU Main Relay) terminal of PCB

Is the measured value within specification?

	▶ Go to "Component Inpsection" procedure.
	▶ Repair open or short in circuit and then go to "Verification of vehicle Repair" procedure.