W/Harness Inspection

Engine

Engine Control - P0647 A/C Clutch Relay Control Circuit High - 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

1. Check voltage
(1) IG "OFF".
(2) Disconnect A/C relay connector.
(3) IG "ON" and ENG "OFF"
(4) Measure the voltage between terminal 2 of A/C relay harness connector and chassis ground.
(5) Measure the voltage between terminal 4 of A/C relay harness connector and chassis ground.

Specification : B+




(6) Is the measured voltage normal?






Control Circuit Inspection

1. Check short in harness
(1) IG "OFF".
(2) Disconnect A/C relay and PCM connector.
(3) Measure the voltage between terminal 3 of A/C relay harness connector and chassis ground.

Specification : Approx. 0 V




(4) Is the measured resistance within specification?