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 MAPS connector.
2. IG "ON".
3. Measure voltage between power terminal of MAPS harness connector and chassis ground.

Specification : Approx. 5V





4. Is the measured voltage within specification?





Check short to ground in harness
1. IG "OFF".
2. Disconnect MAPS and ECM connector.
3. Measure the resistance between signal terminal of MAPS harness connector and ground.

Specification : Infinite





4. Is the measured resistance within specification?





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

Specification : Approx. below 1 Ohm.





3. Is the measured resistance within specification?






Ground Circuit Inspection

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

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









4. Is the measured voltage within specification?