DTC Troubleshooting: P0123 (7)

DTC P0123: TP Sensor Circuit High Voltage

1. Turn the ignition switch ON (II).

1. Check the TP SENSOR in the DATA LIST with the HDS.

Is there about 0.5 V when the throttle is fully closed and about 4.5 V when the throttle is fully opened?

YES | - | Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the TP sensor and the ECM/PCM.■
NO | - | Go to Step 3 .

1. Turn the ignition switch OFF.

1. Disconnect the TP sensor 3P connector.

1. Turn the ignition switch ON (II).

1. At wire harness side, measure voltage between TP sensor 3P connector terminals No. 1 and No. 3.

Is there about 5 V?

YES | - | Go to Step 8 .
NO | - | Go to Step 7 .

1. Measure voltage between ECM/PCM connector terminals A20 and A23.

Is there about 5 V?

YES | - | Repair open in the wire between the ECM/PCM (A23) and the TP sensor, then go to Step 10 .
NO | - | Go to Step 15 .

1. Turn the ignition switch OFF.

1. Replace the throttle body (the TP sensor is not available separately).

1. Reconnect all connectors.

1. Turn the ignition switch ON (II).

1. Reset the ECM/PCM with the HDS.

1. Do the ECM/PCM idle learn procedure.

1. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES | - | If DTC P0123 is indicated, check for poor connections or loose terminals at the TP sensor and the ECM/PCM, then go to Step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO | - | Troubleshooting is complete.■

1. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.

1. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES | - | If DTC P0123 is indicated, check for poor connections or loose terminals at the TP sensor and the ECM/PCM, then go to Step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO | - | If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM. ■