DTC U129E
DTC U129E: F-CAN Malfunction (Powertrain Control Module (PCM)-Power Control Unit (PCU))
General Description
Without CAN gateway
With CAN gateway
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 keyless access/TPMS control unit via the F-CANlines 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 |
|---|---|---|
| 12 volt battery voltage [BATTERY] | 10.0 V | - |
[ ]: HDS Parameter
Malfunction Threshold
The PCM does not receive any signals via the F-CANlines 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.
- F-CAN circuit F-CAN_H* 3 (F-CAN A_H)* 4 line open
- F-CAN circuit F-CAN_L* 3 (F-CAN A_L)* 4 line open
- F-CAN circuit F-CAN_H* 3 (F-CAN A_H)* 4 line short to ground
- F-CAN circuit F-CAN_L* 3 (F-CAN A_L)* 4 line short to ground
- Keyless access/TPMS control unit failure
- PCM internal circuit failure
*3: Without CAN gateway (6-Speed A/T)*4: With CAN gateway (6-Speed A/T), 9-Speed A/T
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.