A/T

Advanced Diagnostics

DTC U0122: F-CAN Malfunction (PCM-VSA Modulator-Control Unit)







General Description
The controller area network (CAN) transmits/receives pulsing signals to/from the control modules simultaneously by using two signal lines (CANH and CANL). When the powertrain control module (PCM) does not receive the signals via the CAN lines for more than a set time, the PCM detects a malfunction and a DTC is stored.

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







Enable Conditions







Malfunction Threshold
One of these symptoms occurs.
- No signals from the VSA modulator-control unit via the CAN lines are received for at least 1 second.
- Abnormal signals from the VSA modulator-control unit via the CAN line are received at least 20 times.

Diagnosis Details

Conditions for illuminating the indicator
When a malfunction is detected, the D indicator blinks, and the DTC and the freeze frame data are stored in the PCM memory. The MIL does not come on.

Conditions for clearing the DTC
The DTC and the freeze frame data can be cleared by using the scan tool Clear command or by disconnecting the battery.