DTC U0029: F-CAN Communication Line Error
- Make sure the HDS communicates with the PCM and other vehicle systems. If it does not, go to DLC Circuit Troubleshooting (see DLC CIRCUIT TROUBLESHOOTING ).
- If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
- Clear the DTCs with the HDS.
- Turn the ignition switch to LOCK (0) and then back to ON (II).
- Wait for at least 6 seconds.
- Check for DTCs with the HDS.
Is DTCs U0029 indicated?
YES -Go to step 5.
NO -Intermittent failure, the system is OK at this time. Check for loose or poor connections, or worn/shorted wires. If the connections are good, check for the battery condition (see BATTERY TEST ) and the charging system.
- Check for DTCs in the PCM with the HDS.
Are any DTCs indicated?
YES -Go to the indicated PCM DTC'S TROUBLESHOOTING .
NO -Go to step 6.
- Do the gauge control module input test.
Are all inputs OK?
YES -Go to step 7.
NO -Repair the faulty input, then recheck the DTCs.
- Substitute a known-good gauge control module.
- Clear the DTCs with the HDS.
- Turn the ignition switch to LOCK (0) and then back to ON (II).
- Start and run the engine for at least 5 seconds, then turn the engine off.
- Check for DTCs with the HDS.
Is DTC U0029 indicated?
YES -Go to step 12.
NO -The original gauge control module is faulty; replace it.
- Update the PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
- Check for Pending or Confirmed DTCs with the HDS.
Is DTC U0029 indicated?
YES -Check for poor connections or loose terminals at the gauge control module and the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then recheck. 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 (see PCM REPLACEMENT ).