## DTC Troubleshooting: P0123 (7-2)

DTC P0123 (7-2): | TP Sensor Circuit High Voltage

1. | Turn the ignition switch ON (II).

2. | Check the throttle position with the scan tool. Is there about 10% or 0.5 V when the throttle is fully closed and about 90% or 4.5 V when the throttle is fully opened? YES - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the TP sensor and at the ECM/ PCM.n NO - Go to 3.

3. | Turn the ignition switch OFF.

4. | Disconnect the TP sensor 3P connector.

5. | Turn the ignition switch ON (II).

6. | At the wire harness side, measure voltage between the TP sensor 3P connector terminals No. 1 and No. 3. Is there about 5 V? YES - Replace the throttle body.n NO - Go to 7.

7. | Measure voltage between ECM/PCM connector terminals A10 and A20. Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (A10) and the TP sensor.n NO - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/ PCM.n