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 then go to "Verification of Vehicle Repair" procedure.
	▶ Go to "Rail Pressure Regulator Valve Inspection" procedure.

Ignition switch "OFF"

Refer to "Shop Manual" and disconnect RPRV connector.

Ignition switch "ON"

Measure the voltage between Pin No. 2 (Power) terminal of RPRV 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"

Refer to "Shop Manual" and disconnect RPRV connector.

Ignition switch "ON"

Measure the voltage between Pin No. 1 (Control) terminal of RPRV harness connector and chassis ground.

Is the measured value within specification?

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

Ignition switch "OFF"

Refer to "Shop Manual" and disconnect FPCV connector.

Ignition switch "ON"

Measure the voltage between Pin No. 2 (Power) terminal of FPCV 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"

Refer to "Shop Manual" and disconnect FPCV connector.

Ignition switch "ON"

Measure the voltage between Pin No. 1 (Control) terminal of FPCV 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.