W/Harness Inspection

Terminal and Connector inspection

1. 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.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?






Power Circuit Inspection

Check for Short to Ground in Power Circuit
1. Ignition 'OFF'.
2. Disconnect A/C pressure sensor harness connector.
3. Measure resistance between power terminal of A/C pressure S. harness connector and chassis ground.

Specification : Infinite Ohms





4. Is resistance within specification?





Check for Open in Power Circuit
1. IG KEY OFF.
2. Disconnect A/C pressure sensor harness connector.
3. IG KEY ON.
4. Measure voltage between power terminal of A/C pressure S. harness connector and chassis ground.

Specification : Approx. 5V





5. Is voltage within specification?






Signal Circuit Inspection

Check for Short to Ground in Signal Circuit
1. IG KEY OFF.
2. Disconnect PCM and A/C pressure sensor harness connector.
3. Measure resistance between signal terminal of A/C pressure S. harness connector and chassis ground.

Specification : Infinite Ohms





4. Is resistance within specification?





Check for Open in Signal Circuit
1. IG KEY OFF.
2. Disconnect A/C pressure sensor harness connector.
3. Measure resistance between both ends of signal line.

Specification : Below 1 Ohm





4. Is resistance within specification?