Advanced Diagnostics

Advanced Diagnostics - DTC U0131: F-CAN Malfunction (Engine Control Module (ECM)-EPS Control Unit) (Engine Type: K24Z7)

General Description






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

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






Enable Conditions






Malfunction Threshold
The ECM does not receive any signals via the F-CAN lines for at least 1 second.

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
- ECM 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 ECM 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 battery.