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?

YES

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

NO

▶ Go to " Power Circuit Inspection " procedure.

IG Key "OFF".

Disconnect the A/C pressure sensor connector

IG Key "ON".

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

Is the measured voltage within specification ?

YES

▶ Go to "Ground Circuit Inspection" procedure.

NO

▶ Repair open in harness and go to "Verification of Vehicle Repair" procedure.

IG Key "OFF".

Disconnect the A/C pressure sensor connector.

IG Key "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 ?

YES

▶ Go to "Signal Circuit Inspection" procedure.

NO

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

IG Key "OFF".

Disconnect the A/C pressure sensor connector.

IG Key "ON".

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

Is the measured voltage within specification ?

YES

NO

IG Key "OFF".

Disconnect A/C pressure sensor connector and PCM connector.

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

Is the measured resistance within specification ?

YES

NO