DTC Troubleshooting: P2123 (37)

DTC P2123: APP Sensor A (Throttle Position Sensor D) Circuit High Voltage

1. Turn the ignition switch ON (II).

1. Check APP SENSOR-A in the DATA LIST with the HDS.

Is there about 4.9 V or more?

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

1. Turn the ignition switch OFF.

1. Disconnect the APP sensor 6P connector.

1. Turn the ignition switch ON (II).

1. At the wire harness side, measure voltage between APP sensor 6P connector terminals No. 5 and No. 6.

Is there about 5 V?

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

1. Measure voltage between ECM/PCM connector terminals A21 and A24.

Is there about 5 V?

YES | - | Repair open in the wire between the ECM/PCM (A24) and the APP sensor, then go to Step 10 .
NO | - | Go to Step 15 .

1. Turn the ignition switch OFF.

1. Replace the APP sensor.

1. Reconnect the APP sensor 6P connector.

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 P2123 is indicated, check for poor connections or loose terminals at the APP 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 P2123 is indicated, check for poor connections or loose terminals at the APP 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. ■