W/Harness Inspection

P0123 Throttle Position Sensor 1 Signal Circuit High Input

Inspection/Repair - W/Harness Inspection

Ground Circuit Inspection

NOTE:
Check for open or short circuit in harness. Refer to "Signal Waveform & Data" in the "General Information" procedure.

1. Ignition "OFF".
2. Disconnect TPS connector.
3. Measure resistance between ground terminal of TPS harness connector and chassis ground.

Specification : Approx. 0 Ohms




4. Is resistance within the specification?






Signal Circuit Inspection

NOTE:
Check for open or short circuit in harness. Refer to "Signal Waveform & Data" in the "General Information" procedure.

1. Check for short to battery in signal circuit
(1) Disconnect PCM connector.
(2) Ignition "ON" & Engine "OFF".
(3) Measure voltage between signal terminal of TPS harness connector and chassis ground.

Specification : Approx. 0 V




(4) Is voltage within the specification?





2. Check for open in signal circuit
(1) Ignition "OFF"
(2) Measure resistance between signal terminal of TPS harness connector and TPS signal terminal of the ECM harness connector.

Specification : Approx. 0 Ohms




(3) Is resistance within the specification?






Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness(es) 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?