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 " Power Circuit Inspection " procedure.

IG "OFF" and disconnect the A/C pressure sensor connector.

IG "ON"

Measure the voltage between power terminal of A/C pressure sensor harness connector and chassis ground.

Is the measured voltage within specification ?

	▶ Go to "Signal Circuit Inspection" procedure.
	▶ Repair open or short to ground in harness and go to "Verification of Vehicle Repair" procedure.

IG "OFF" and disconnect A/C pressure sensor and ECM connector.

Measure the resistance between signal terminal of A/C pressure sensor harness connector and chassis ground.

Is the measured resistance within specification?

	▶ Go to "Check open in harness" as follows.
	▶ Repair short to ground in harness, and go to "Verification of Vehicle Repair" procedure.

IG "OFF" and disconnect A/C pressure sensor and ECM connector.

Measure the resistance between signal terminal of A/C pressure sensor harness connector and A/C pressure sensor signal terminal of ECM harness connector.

Is the measured resistance within specification?

	▶ Go to "Component inspection" procedure.
	▶ Repair open in harness, and go to "Verification of Vehicle Repair" procedure.