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 battery in harness
1. IG "OFF" and disconnect IATS connector and ECM connector.
2. Measure resistance between signal terminal of IATS harness connector and power terminal of MAFS harness connector.
3. Measure resistance between signal terminal of IATS harness connector and signal terminal of MAFS harness connector.

Specification : Infinite





4. Is the measured resistance within specification?





Check open in harness
1. IG "OFF" and disconnect IATS connector and ECM connector.
2. Measure resistance between signal terminal of IATS harness connector and IATS signal terminal of ECM harness connector.

Specification : below 1 Ohm





3. Is the measured resistance within specification?






Ground Circuit Inspection

Check open in harness
1. IG "OFF" and disconnect IATS connector and then IG "ON".
2. Measure voltage between signal terminal of IATS harness connector and chassis ground. (Measurement "A")
3. Measure voltage between signal and ground terminals of IATS harness connector. (Measurement "B")

Specification : Voltage difference between measurement "A" and "B" is below 200mV.









4. Is the measured voltage within specification?