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DTC 85: F-CAN Communication Failure

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2017 Honda Odyssey, 2016 Honda Odyssey, 2015 Honda Odyssey, 2014 Honda Odyssey, and 2013 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Check for fuel and emissions 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), and then back to ON (II).
  4. Wait about 5 seconds.
  5. Check for DTCs with the HDS.

    Is DTC 85 indicated? 

    YES  -Go to step 6.

    NO  -Intermittent failure, 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) (see PCM REPLACEMENT ).
  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.
    TPMS CONTROL UNIT CONNECTOR TERMINAL REFERENCE CHART

    Terminal Name TPMS Control Unit 20P Connector Terminal PCM Connector A (49P) Terminal
    F-CAN L No. 20 No. 49
    F-CAN H No. 9 No. 48
    Fig 1: Checking Continuity Between TPMS Control Unit 20P Connector Terminals And PCM Connector A (49P) Terminals
    G06969664Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Check for loose terminals and poor connections at the TPMS control unit and G402. 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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