A/T System

DTC Troubleshooting: U0122 (107)

DTC U0122:

F-CAN Malfunction (PCM-VSA Modulator-Control Unit)

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot with the HDS, and review the General Troubleshooting Information How To Troubleshoot The A/T System.

1. Clear the DTC with the HDS.

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

3. Check whether DTC U0122 is indicated in the DTCs/Freeze Data in PGM-FI Mode Menu with the HDS.

Is DTC U0122 indicated in the PGM-FI system?

YES -

Troubleshoot DTC U0122 in the PGM-FI system PGM-FI System.

NO -

Go to step 4.

4. Check whether DTC U0122 is indicated in the DTCs/Freeze Data in A/T Mode Menu with the HDS.

Is DTC U0122 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time.

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

6. Check for Pending or Confirmed DTCs with the HDS.

Is DTC U0122 indicated?

YES -

If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, go to step 1.

NO -

Go to step 7.

7. Monitor the OBD status for U0122 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

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 DTCs were indicated on step 6, go to the indicated DTC's troubleshooting.

NO -

Check for poor connections and loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, return to step 7 and recheck.