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?

	▶ 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 the boost pressure sensor connector.

Ignition Switch "ON"

Measure voltage of Pin No. 2(Power) of the boost pressure sensor connector and chassis ground.

Is the measured value withing specification?

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

Ignition Switch "OFF"

Disconnect battery (-) cable.

Refer to "Shop Manual"and disconnect the boost pressure sensor connector.

Measure resistance between Pin No. 4(Ground) of the boost pressure sensor connector and chassis ground.

Ignition switch "OFF"

Refer to "Shop Manual"and disconnect the boost pressure sensor connector.

Ignition switch "ON"

Measure voltage between Pin No. 2(Power) of the boost pressure sensor and chassis ground.(A)

Measure voltage between Pin No. 2(Power) and Pin No. 4(Ground) of the boost pressure sensor connector.(B)

Is the measured value within specification?

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

Ignition switch "OFF"

Refer to "Shop Manual"and disconnect the boost pressure sensor connector.

Ignition switch "ON"

Measure voltage between Pin No. 1(Signal) of the boost pressure sensor and chassis ground.

Is the measured value within specification?

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