DTC U0104 (With Multipurpose Camera Unit) (2019 2020 2021)
DTC U0104: F-CAN Malfunction (Powertrain Control Module (PCM)-Driving Support System Control Unit)
General Description
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 information is not sent from the multipurpose camera unit via the F-CAN lines and this condition continues for a specified time or when the information sent from the multipurpose camera unit is abnormal and this condition continues for a specified cycle, the powertrain control module (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 cannot receive any signals from the multipurpose camera unit via the F-CAN lines for at least 1.5 seconds.
- The information sent from the multipurpose camera unit is abnormal at least 20 times.
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.
- Multipurpose camera unit failure (include fuse fall-outs)
- F-CAN circuit F-CAN A H line open
- F-CAN circuit F-CAN A L line open
- F-CAN circuit F-CAN A H line short to ground
- F-CAN circuit F-CAN A L line short to ground
- F-CAN circuit F-CAN B H line open
- F-CAN circuit F-CAN B L line open
- F-CAN circuit F-CAN B H line short to ground
- F-CAN circuit F-CAN B 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.