W/Harness Inspection

Engine Control
P0642 Sensor Reference Voltage 'A' Circuit Low - 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 Refrigerant Pressure Sensor connector.
2. IG "ON".
3. Measure voltage between power terminal of A/C Refrigerant Pressure Sensor harness connector and chassis ground.

Specification : Approx. 5 V




4. Is the measured voltage within specification?





Check short to ground in power circuit
1. IG "OFF" and disconnect A/C Refrigerant Pressure Sensor connector.
2. Measure resistance between power terminal of A/C Refrigerant Pressure Sensor harness connector and chassis ground.

Specification : Infinite




3. Is the measured resistance within specification?