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?






Signal Circuit Inspection

Check voltage
1. IG "OFF" and disconnect IATS connector.
2. IG "ON"
3. Measure voltage between signal terminal of IATS harness connector and chassis ground.

Specification : Approx. 5V





4. Is the measured voltage within specification?





Check short to ground in harness
1. IG "OFF" and disconnect IATS connector and ECM connector.
2. Measure resistance between signal terminal of IATS harness connector and chassis ground. (Measurement "A")
3. Measure resistance between signal and ground terminals of IATS harness connector. (Measurement "B")
4. Measure resistance between signal terminal of IATS harness connector and ground terminal of MAFS harness connector. (Measurement "B")

Specification : Infinite









5. Is the measured resistance within specification?