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 next step as below

Ignition 'OFF'.

Disconnect A/C pressure sensor harness connector.

Measure resistance between power terminal of A/C pressure S. harness connector and chassis ground.

Is resistance within specification?

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

IG KEY OFF.

Disconnect A/C pressure sensor harness connector.

IG KEY ON.

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

Is voltage within specification?

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

IG KEY OFF.

Disconnect PCM and A/C pressure sensor harness connector.

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

Is resistance within specification?

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

IG KEY OFF.

Disconnect A/C pressure sensor harness connector.

Measure resistance between both ends of signal line.

Is resistance within specification?

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