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DTC 85: F-CAN Communication Failure

WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Check the fuel and emission systems DTCs with the HDS, and troubleshoot the PCM and F-CAN communication errors first (see GENERAL TROUBLESHOOTING INFORMATION ).
  1. Turn the ignition switch to ON (II).
  2. Clear the DTC with the HDS.
  3. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
  4. Wait about 5 seconds.
  5. Check for DTCs with the HDS.

    Is DTC 85 indicated? 

    YES  -Go to step 6.

    NO  -The system is OK at this time.

  6. Test-drive the vehicle.

    Does the speedometer work? 

    YES  -Go to step  10.

    NO  -Go to step 7.

  7. Turn the ignition switch to LOCK (0).
  8. Disconnect the TPMS control unit 20P connector (see TPMS CONTROL UNIT REPLACEMENT  ).
  9. Test-drive the vehicle.

    Does the speedometer work? 

    YES  -Check for loose terminals and poor connections at the TPMS control unit. If necessary, substitute a known-good TPMS control unit (see TPMS CONTROL UNIT REPLACEMENT  ), and recheck.

    NO  -Turn the ignition switch to LOCK (0), and reconnect all connectors, then check and troubleshoot the fuel and emissions systems (see GENERAL TROUBLESHOOTING INFORMATION ).

  10. Turn the ignition switch to LOCK (0).
  11. Short the SCS line with the HDS.
  12. Disconnect PCM connector A (49P).
  13. Disconnect the TPMS control unit 20P connector (see TPMS CONTROL UNIT REPLACEMENT  ).
  14. Check for continuity between the TPMS control unit 20P connector terminals and the PCM connector A (49P) terminals according to the table.
    Terminal Name TPMS Control Unit Terminal PCM A Terminal
    F-CAN A L No. 11 No. 49
    F-CAN A H No. 1 No. 48
    Fig 1: Checking Continuity Between TPMS Control Unit 20P Connector Terminals And PCM Connector A (49P) Terminals
    G08052991Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Check for loose terminals and poor connections at the TPMS control unit. If necessary, substitute a known-good TPMS control unit (see TPMS CONTROL UNIT REPLACEMENT  ), and recheck.

    NO  -Repair an open in the wire between the TPMS control unit and the PCM.

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