DTC U3003-1C (EPS Control Unit)

DTC U3003-1C : 12V BATT Voltage Failure

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 above 10 V With the Driving Pattern: Start the engine. Turn the steering wheel to left and right several times, and keep holding each direction for 15 seconds.
Execution	Initial Diagnosis/Regular Diagnosis
Duration	About 15 seconds
DTC Type	1 drive cycle EPS indicator on (Dependant upon the conditions)
Fail Safe Action	Continue or stop EPS function/assist (Dependant upon the conditions) (Re-diagnose at the next IG-ON)
Possible Cause	Open, Short to ground, or Poor connection between the EPS control unit and the auxiliary under-hood fuse/relay box (+B EPS line) Fuse failure (Auxiliary under-hood fuse/relay box No. B1-1 (60 A)) Alternator failure Abnormal 12 volt battery EPS motor/control unit internal failure