W/Harness Inspection

Terminal and Connector inspection

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






Power Circuit Inspection

Check voltage
1. IG "OFF" and disconnect A/C relay.
2. IG "ON"
3. Measure voltage between battery power supply terminals of A/C relay harness connector and chassis ground.

Specification : Approx. B+





4. Is the measured voltage within specification






Control Circuit Inspection

Check Short to Ground in harness
1. IG "OFF" and disconnect A/C Relay and ECM connector.
2. Measure the resistance between control terminal of A/C relay harness connector and chassis ground.

Specification : Infinite





3. Is the measured resistance within specification?





Check Open in harness
1. IG "OFF" and disconnect A/C relay and ECM connector.
2. Measure the resistance between control terminal of A/C relay harness connector and A/C relay control terminal of ECM harness connector.

Specification : Approx. below 1 Ohm





3. Is the measured resistance within specification?