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

IG "OFF" and disconnect P/S pressure sensor connector and ECM connector.

IG "ON"

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

Measure the voltage between power and ground terminals of A/C pressure sensor harness connector.(Measurement "B")

Is the measured voltage within specification ?

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

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

IG "ON"

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

Is the measured voltage within specification ?

	▶ Go to "Component Inspection" procedure.
	▶ Go to "Check short to battery in harness" procedure.

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

Measure the resistance between signal and power terminals of A/C pressure sensor harness connector.

Is the measured resistance within specification?

	▶ Go to "Component Inspection" procedure.
	▶ Repair short to battery in harness, and go to "Verification of Vehicle Repair" procedure.