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 the A/C pressure sensor connector.
2. IG "ON"
3. Measure the voltage between power terminal of A/C pressure sensor harness connector and chassis ground.

Specification : Approx. 5V





4. Is the measured voltage within specification?






Signal Circuit Inspection

Check short to ground in harness
1. IG "OFF" and disconnect A/C pressure sensor and ECM connector.r.
2. Measure the resistance between signal terminal of A/C pressure sensor 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 pressure sensor and ECM connector.
2. Measure the resistance between signal terminal of A/C pressure sensor harness connector and A/C pressure sensor signal terminal of ECM harness connector.

Specification : Below 1 Ohm





3. Is the measured resistance within specification?