DTC Troubleshooting

DTC U0028: F-CAN Communication Circuit Error (FCAN Bus OFF)

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review General Troubleshooting Information.

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Check for Temporary DTCs or DTCs in the PGM-FI SYSTEM with the HDS.
Is DTC U0155 indicated in the PGM-FI SYSTEM?
YES - Go to the DTC U0155 troubleshooting in the PGM-FI system.
NO - Go to step 4.

4. Check for DTCs in the A/T SYSTEM with the HDS.
Is DTC U0028 indicated in the A/T SYSTEM?
YES - Go to step 5.
NO - Intermittent failure, the system is OK at this time.

5. Update the PCM if it does not have the latest software, or substitute a known good PCM.
6. Turn the ignition switch ON (II).
7. Check for DTCs the A/T SYSTEM with the HDS.
Is DTC U0028 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 - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. If any other DTCs were indicated, go to the indicated DTC's troubleshooting.