W/Harness Inspection

Engine Control
P0123 Throttle Position Sensor 1 Signal Circuit High Input - Inspection/Repair:_:W/Harness Inspection

Terminal & 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 short to battery in harness
1. IG "OFF" and disconnect ETC Motor & TPS connector.
2. IG "ON".
3. Measure voltage between TPS1 power terminal of ETC Motor & TPS harness connector and chassis ground.

Specification :Approx. 5V








4. Is the measured voltage within specification ?






Signal Circuit Inspection

Check short to battery in harness
1. IG "OFF" and disconnect ETC Motor & TPS connector.
2. IG "ON".
3. Measure voltage between TPS1 signal terminal of ETC Motor & TPS harness connector and chassis ground.

Specification :Approx. 5V








4. Is the measured voltage within specification ?






Ground Circuit Inspection

Check open in harness
1. IG "OFF" and disconnect ECTS connector and then IG "ON".
2. Measure voltage between TPS1 power terminal of ETC Motor & TPS harness connector and chassis ground.(Measurement "A")
3. Measure voltage between TPS1 power and TPS1 ground terminals of ETC Motor & TPS harness connector.(Measurement "B")

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








4. Is the measured voltage within specification ?