DTC U0122: Lost Communication With VSA Modulator-Control Unit
- Clear the DTC with the HDS.
- Turn the ignition switch to ON (II).
- Check for Temporary DTCs or DTCs in the PGM-FI SYSTEM with the HDS.
Is DTC U0122 indicated in the PGM-FI SYSTEM?
YES - Go to the DTC U0122 troubleshooting in the PGM-FI SYSTEM (see DTC U0122: F-CAN MALFUNCTION (PCM-VSA MODULATOR-CONTROL UNIT) ). ■
NO - Go to step 4.
- Check for Temporary DTCs or DTCs in the A/T SYSTEM with the HDS.
Is DTC U0122 indicated in the A/T SYSTEM?
YES - Go to step 5.
NO - Intermittent failure, the system is OK at this time. If any other Temporary DTCs or DTCs were indicated, go to the indicated DTC's troubleshooting. ■
- Update the PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
- Start the engine, and wait for at least 2 minutes.
- Check for Temporary DTCs or DTCs in the A/T SYSTEM with the HDS.
Is DTC U0122 indicated in the A/T SYSTEM?
YES -Check for poor connections or loose terminals between the VSA modulator-control unit and the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then go to step 6 If the PCM was substituted, go to step 1
NO - Go to step 8.
- Monitor the OBD status for U0122 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.
Does the result indicate PASSED?
YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ). If any other Temporary DTCs or DTCs were indicated on step 7 go to the indicated DTC's troubleshooting. ■
NO -If the HDS indicates FAILED, check for poor connections or loose terminals between the VSA modulator-control unit and the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE 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