DTC 86-11, 86-21, 86-22, 86-23, 86-24, 86-25, 86-41: F-CAN Communication With ECM/PCM Malfunction; F-CAN Communication With Engine Malfunction; F-CAN Communication With Engine Malfunction; F-CAN Communication With Engine Malfunction; F-CAN Communication With Engine Malfunction; F-CAN Communication With Engine Malfunction; F-CAN Communication With EAT 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).
Test-drive the vehicle. Drive the vehicle at 7 mph (10 km/h) or more.
NOTE: Drive the vehicle on a straight section of road, not on a lift.
Check for DTCs with the HDS.
Is DTC 86-11, 86-21, 86-22, 86-23, 86-24, 86-25, and/or 86-41 indicated?

YES - If the DTC 86-01 is indicated at the same time, do the DTC 86-01 troubleshooting (see DTC 86-01: F-CAN BUS-OFF MALFUNCTION ). If the DTC 86-01 is not indicated, go to step 6.

NO - If any other DTCs are indicated, go to the indicated DTCs troubleshooting. If DTCs are not indicated, intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting (see Intermittent Failures ).
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 the 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 ECM/PCM if it does not have the latest software (see ECM/PCM UPDATE ).
Clear the DTC with the HDS.
Turn the ignition switch to LOCK (0).
Test-drive the vehicle. Drive the vehicle at 7 mph (10 km/h) or more.
NOTE: Drive the vehicle on a straight section of road, not on a lift.
Check for DTCs with the HDS.
Is DTC 86-11, 86-21, 86-22, 86-23, 86-24, 86-25, and/or 86-41 indicated?

YES - Go to step 17.

NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ).
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).
Test-drive the vehicle. Drive the vehicle at 7 mph (10 km/h) or more.
NOTE: Drive the vehicle on a straight section of road, not on a lift.
Check for DTCs with the HDS.
Is DTC 86-11, 86-21, 86-22, 86-23, 86-24, 86-25, and/or 86-41 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.