P2123

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

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

1. Turn the ignition switch ON (II).
2. 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, the system is OK at this time.Check for poor connections or loose terminals at APP sensor A and the ECM.

3. Turn the ignition switch OFF.
4. Disconnect the APP sensor 6P connector.
5. Turn the ignition switch ON (II).




6. Measure voltage between APP sensor 6P connector terminals No. 2 and No. 3.

Is there about 5 V?

YES - Go to step 12.

NO - Go to step 7.

7. Turn the ignition switch OFF.
8. Jump the SCS line with the HDS.
9. Disconnect ECM connector A (44P).




10. Connect APP sensor 6P connector terminal No. 2 to body ground with a jumper wire.




11. Check for continuity between ECM connector terminal A35 and body ground.

Is there continuity?

YES - Go to step 19.

NO - Repair open in the wire between the ECM (A35) and APP sensor A, then go to step 14.

12. Turn the ignition switch OFF.
13. Replace the accelerator pedal module.
14. Reconnect all connectors.
15. Turn the ignition switch ON (II).
16. Reset the ECM with the HDS.
17. Do the ECM idle learn procedure.
18. Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES - If DTC P2123 is indicated, check for poor connections or loose terminals at APP sensor A and the ECM, 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.

19. Update the ECM if it does not have the latest software, or substitute a known-good ECM.
20. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2123 indicated?

YES - Check for poor connections or loose terminals at APP sensor A and the ECM. If the ECM was updated, substitute a known-good ECM, then recheck. If the ECM was substituted, go to step 1.

NO - If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.