DTC 86-01: F-CAN Bus-Off Malfunction

WARNING: This page is about a different car, the 2011 Honda Fit, 2010 Honda Fit, and 2009 Honda Fit. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information. (See General Troubleshooting Information ).

NOTE: Troubleshoot the fuel and emissions DTCs first.

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
Check for DTCs with the HDS.
Is DTC 86-01 indicated?

YES - Go to step 6.

NO - Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting (see Intermittent Failures ).
Check for fuel and emissions systems DTCs with the HDS (see GENERAL TROUBLESHOOTING INFORMATION ).
Are you able to retrieve fuel and emissions systems DTCs?

YES - Troubleshoot the fuel and emissions systems DTCs (see DTC TROUBLESHOOTING INDEX ), then go to step 6.

NO - Go to F-CAN circuit troubleshooting (see F-CAN CIRCUIT TROUBLESHOOTING ).
Turn the ignition switch to LOCK (0).
Short the SCS line with the HDS.
Disconnect ECM/PCM connector A (49P). See ECM/PCM REPLACEMENT .
Disconnect the VSA modulator-control unit 36P connector (see step 3 ).

Check for continuity between VSA modulator-control unit 36P connector terminal and ECM/PCM connector A (49P) terminal (see table below).

CONNECTOR TERMINAL REFERENCE TABLE

Sign	VSA Modulator-control Unit 36P Connector Terminal	ECM/PCM Connector A (49P) Terminal
F-CAN-L	No. 1	A4
F-CAN-H	No. 14	A3

Fig 1: Checking Continuity Between VSA Modulator-Control Unit 36P & ECM/PCM Connector A (49P) Terminal

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 11.

NO - Repair open in the wire between the ECM/PCM and the VSA modulator-control unit.

Reconnect all connectors.
Update the VSA modulator-control unit if it does not have the latest software (see VSA MODULATOR-CONTROL UNIT UPDATE ).
Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
Check for DTCs with the HDS.
Is DTC 86-01 indicated?

YES - Check for loose terminals in the VSA modulator-control unit 36P connector. If the symptom/indication is still present, replace the VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ).

NO - If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.