DTC Troubleshooting: U0028 (107-1)
|DTC U0028:||F-CAN Communication Circuit Error (F-CAN Bus OFF)|
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review General Troubleshooting Information.
|1.||Clear the DTC with the HDS.|
|2.||Turn the ignition switch ON (II).|
|3.||Check whether the DTC U0028 or U0155 is indicated in the DTCs/Freeze Data in PGM FI Mode Menu with the HDS.|
Is DTC U0028 or U0155 indicated in the PGM FI system?
NO - Go to 4.
|4.||Check whether the DTC U0028 is indicated in the DTCs/Freeze Data in A/T Mode Menu with the HDS.|
Is DTC U0028 indicated?
YES - Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM.n
NO - Intermittent failure, the system is OK at this time.n