LEMON Manuals: Even more car manuals for everyone
Home >> Acura >> 2004 >> TL Standard >> Repair and Diagnosis >> Electrical >> Gauges >> Display And Gauge System >> DTC Troubleshooting >> DTC B1178: F-CAN Communication Line Error

DTC B1178: F-CAN Communication Line Error

NOTE: 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 ).
  1. Clear the DTCs with the HDS.
  2. Turn the ignition switch OFF, and then back ON (II).
  3. Start and run the engine for at least 5 seconds then turn the engine off.
  4. Check for DTCs with the HDS.

    Is DTC B1178 indicated? 

    1. YES  - Go to step 5.
    2. NO  - Intermittent failure, the F-CAN communication line is OK at this time. Check for loose or poor connections. If the connections are good, check the battery condition (see BATTERY TEST ) and the charging system.
  5. Check for DTCs in the ECM/PCM with the HDS.

    Are any DTCs indicated? 

    1. YES  - Go to the indicated ECM/PCM DTCs troubleshooting.
    2. NO  - Go to step 6.
  6. Do the GAUGE CONTROL MODULE INPUT TEST .

    Are all inputs OK? 

    1. YES  - Go to step 7.
    2. NO  - Repair the faulty input, then recheck the DTCs.
  7. Substitute a known-good gauge control module.
  8. Clear the DTCs with the HDS.
  9. Turn the ignition switch OFF, and then back ON (II).
  10. Start and run the engine for at least 5 seconds then turn the engine off.
  11. Check for DTCs with the HDS.

    Is DTC B1178 indicated? 

    1. YES  - Replace the ECM/PCM.
    2. NO  - The original gauge control module is faulty; replace it (see GAUGE CONTROL MODULE REPLACEMENT ).
scientia non olet · About LEMON Manuals