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.

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 or replace as necessary and then, 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 "Ground Circuit Inspection" procedure.
	▶ Repair or replace as necessary and then, go to "Verification of Vehicle Repair" 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.(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 "Component Inspection" procedure.
	▶ Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.