DTC Advanced Diagnostics: U0122-00
DTC U0122-00: F-CAN Malfunction (EPS Control Unit-VSA Modulator-Control Unit)
NOTE
Initial Diagnosis:
The initial on-board diagnosis occurs right after the vehicle condition is turned to the ON mode, and the EPS indicator comes on, and continues until the indicator goes off.
Regular Diagnosis:
The regular on-board diagnosis begins right after the EPS indicator goes off, and it continues until the vehicle condition is turned to the OFF (LOCK) mode.
Review "How to troubleshoot the EPS system" before doing the DTC troubleshooting procedure.
Test-drive the vehicle according to local traffic conditions and regulations. Do not test-drive on a lift unless specified.
The possible causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

Confirmation Procedure
Basic Condition:
12 volt battery voltage 10 - 16 V
IG voltage continued more than 10 V for at least 1 second

With the Driving Pattern:
1.
Turn the vehicle to the ON mode.
Execution
Initial Diagnosis/Regular Diagnosis
Duration
About 10 seconds
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Continue EPS function/assist
Stop motion adaptive-EPS function/assist (Dependant upon the conditions)
(Continue system diagnosis: EPS function/assist will return to normal after the system returns to normal)
Possible Cause
Open or Poor connection between the EPS control unit and the VSA modulator-control unit (F-CAN lines)
VSA modulator-control unit internal failure
EPS motor/control unit internal failure