W/Harness Inspection

Engine Control
P2127 Accelerator Position Sensor 2 Signal Circuit Low Input - 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 APS connector.
2. IG "ON".
3. Measure voltage between APS 2 power terminal of APS harness connector and chassis ground.

Specification : Approx. 5 V




4. Is the measured voltage within specification?






Signal Circuit Inspection

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

Specification : Infinite








5. Is the measured resistance within specification?





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

Specification : Approx. below 1 Ohms.




3. Is the measured resistance within specification?