W/Harness Inspection

P0647 A/C Clutch Relay Control Circuit High

Inspection/Repair - W/Harness Inspection

Terminal & 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 Battery in harness
1. IG "OFF" and disconnect A/C relay.
2. IG "ON".
3. Measure voltage between control terminals of A/C relay harness connector and chassis ground.

Specification : Approx. 2.5 V




4. Is the measured voltage within specification?