ECM/PCM

DTC Troubleshooting: P2122 (20), P2123 (20)

DTC P2122:

Accelerator Pedal Position (APP) Sensor A (Throttle Position (TP) Sensor D) Circuit Low

DTC P2123:

Accelerator Pedal Position (APP) Sensor A (Throttle Position (TP) Sensor D) Circuit High

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot with the HDS, and review the General Troubleshooting Information Initial Inspection and Diagnostic Overview.

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

2. Clear the DTC with the HDS.

3. Check for Pending or Confirmed DTCs in the PGM-FI SYSTEM with the HDS.

Is DTC P2122 or P2123 indicated in the PGM-FI SYSTEM?

YES -

Go to the DTC P2122 troubleshooting P2122 or DTC P2123 troubleshooting P2123 in Electronic Throttle Control Systems (ETCS).

NO -

Go to step 4.

4. Check for Pending or Confirmed DTCs in the A/T SYSTEM with the HDS.

Is DTC P2122 or P2123 indicated in the A/T SYSTEM?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time. If any other Pending or Confirmed DTCs were indicated, go to the indicated DTC's troubleshooting.

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

6. Start the engine, and let it idle for at least 2 minutes.

7. Check for Pending or Confirmed DTCs the A/T SYSTEM with the HDS.

Is DTC P2122 or P2123 indicated in the A/T SYSTEM?

YES -

Check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 6. If the PCM was substituted, go to step 1.

NO -

Go to step 8.

8. Monitor the OBD STATUS for P2122 or P2123 in the DTCs MENU with the HDS.

Does the HDS indicate PASSED?

YES -

If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM Service and Repair. If any other Pending or Confirmed DTCs were indicated in step 7, go to the indicated DTC's troubleshooting.

NO -

If the HDS indicates FAILED, check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 6. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, go to step 6.