DTC U0131
DTC U0131: F-CAN Malfunction (Powertrain Control Module (PCM)-EPS Control Unit)
General Description
The controller area network (CAN) transmits/receives pulsing signals to/from the control modules simultaneously by using two signal lines (H line and L line). When the powertrain control module (PCM) does not receive the 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
| Execution | Continuous |
| Sequence | None |
| Duration | 1.5 seconds or more |
| DTC Type | One drive cycle, MIL off |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| Elapsed time after the vehicle condition is turned to the ON mode | 3 seconds | - |
| 12 volt battery voltage [Battery] | 10.0 V | - |
[ ]: HDS Parameter
Malfunction Threshold
One of these conditions is met:
- The PCM does not receive any signals via the F-CAN lines for at least 1.5 seconds.
- The information sent from the EPS control unit is abnormal at least 20 times.
Possible Cause
- F-CAN circuit F-CAN C_H line open
- F-CAN circuit F-CAN C_L line open
- F-CAN circuit F-CAN C_H line short to ground
- F-CAN circuit F-CAN C_L line short to ground
- EPS control unit failure (include fuse fall-outs)
- 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.