W/Harness Inspection

Engine

Engine Control - P2138 Accelerator Position Sensor 1 & 2 Signal Voltage Correlation - 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 1 (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", disconnect APS connector and ECM connector.
2. Measure resistance between APS 1 signal and APS 2 signal terminals of APS harness connector.

Specification : Infinite




3. Is the measured resistance within specification?