Many malfunctions in the electrical system are caused by poor harness(es) 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?

YES

▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.

NO

▶ Go to "Power Supply Circuit Inspection" procedure.

Remove the fuel pump relay.

Ignition "ON" & Engine "OFF".

Measure the voltage between terminal 1 of the fuel pump relay harness connector and chassis ground.

Measure the voltage between terminal 5 of the fuel pump relay harness connector and chassis ground.

Specification : Approx. B+

Is voltage within the specification?

YES

▶ Go to "Control Circuit Inspection" procedure.

NO

▶ Check for an open or short to ground in the power supply circuit. Repair as necessary and go to "Verification of Vehicle Repair" procedure.

Check for short to ground in control circuit.

(2)

Measure resistance between terminal 3 of the relay harness connector and chassis ground.

Specification : Infinite

Check for short to power in control circuit.

(3)

Measure voltage between terminal 3 of the relay harness connector and chassis ground.

Specification : Approx 0V

Check for open in control harness.

(1)

Measure resistance between terminals 3 of the relay harness connector and 10 of the ECM harness connector.

Specification : Approx 0Ω