DTC 23-04: F-CAN Bus-Off Malfunction

WARNING: This page is about a different car, the 2013 Honda Fit, 2012 Honda Fit, 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: Check for any powertrain DTCs and troubleshoot those first.

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Turn the ignition switch to LOCK (0).
Start the engine.
Check for DTCs with the HDS.
Is DTC 23-04 indicated?

YES - Go to step 6.

NO - Intermittent failure, the system is OK at this time.
Turn the ignition switch to LOCK (0).
Short the SCS line with the HDS.
Disconnect ECM/PCM connector A (49P). (See SUBSTITUTING THE ECM/PCM ).
Disconnect EPS control unit connector A (11P). See EPS CONTROL UNIT REMOVAL/INSTALLATION .

Check for continuity between EPS control unit connector A (11P) terminals and ECM/PCM connector A (49P) terminals (see table).

CONNECTOR TERMINAL REFERENCE TABLE

Sign	EPS Control Unit Connector A (11P) Terminal	ECM/PCM Connector A (49P) Terminal
F-CAN-L	No. 3	No. 4
F-CAN-H	No. 5	No. 3

Fig 1: Checking Continuity Between ECM/PCM Connector A (49P) Terminal 4 & EPS Control Unit Connector A (11P) Terminal 3

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Check for loose terminals in the EPS control unit connectors, and repair if necessary. If no poor connections are found, replace the EPS control unit (see EPS CONTROL UNIT REMOVAL/INSTALLATION ).

NO - Repair an open in the wire between the EPS control unit and the ECM/PCM.