DTC U0131 (Without Multipurpose Camera Unit)

DTC U0131:  F-CAN Malfunction (PCM-EPS Control Unit)

General Description 

Courtesy of HONDA, U.S.A., INC.

The controller area network (CAN) transmits/receives pulsing signals to/from the control modules simultaneously by using two signal lines (F-CAN H and F-CAN L). When the powertrain control module (PCM) does not receive signals from the electrical power steering (EPS) control unit via the F-CAN lines for a set time, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status 

Execution	Continuous
Sequence	None
Duration	1.5 seconds or more
DTC Type	One drive cycle, MIL off
OBD Status	PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Enable Conditions 

Condition	Minimum	Maximum
12 volt battery voltage [BATTERY]	10.0 V	-

[ ]: HDS Parameter

Malfunction Threshold 

The PCM does not receive any signals from the EPS control unit via the F-CAN lines for at least 1.5 seconds.

Possible Cause 

NOTE:  The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

• EPS control unit failure (include fuse fall-outs)
• F-CAN circuit F-CAN H line open
• F-CAN circuit F-CAN L line open
• F-CAN circuit F-CAN H line short to ground
• F-CAN circuit F-CAN L line short to ground
• PCM internal circuit failure

Diagnosis Details 

Conditions for setting the DTC 

When a malfunction is detected, a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory. The MIL does not come on.

Conditions for clearing the DTC 

The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.