DTC U3006-16 (VSA Control Unit)

DTC U3006-16 : Power Source Failure for ECU (Low Voltage)

NOTE:

Initial Diagnosis:
The initial on-board diagnosis occurs right after the vehicle condition is turned to the ON mode, and the ABS/VSA indicator comes on, and continues until the indicator goes off.
Regular Diagnosis:
The regular on-board diagnosis begins right after the ABS/VSA indicator goes off, and it continues until the vehicle condition is turned to the OFF (LOCK) mode.
Review "How to troubleshoot the VSA 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, and wait for more than 15 seconds.
Execution	Initial Diagnosis/Regular Diagnosis
Duration	About 10 seconds
DTC Type	1 drive cycle ABS indicator on VSA indicator on Brake system indicator (red) on (Dependant upon the conditions)
Fail Safe Action	Stop EBD function (Dependant upon the conditions) Stop ABS function Stop VSA function Stop TCS function Stop engine drag torque control function Stop brake assist function Stop hill start assist function Stop trailer stability assist control function Stop agile handling assist control function Stop ACC function Stop CMBS function
Possible Cause	Poor connection between the VSA modulator-control unit and the under-hood fuse/relay box (FSR+B line) Alternator failure Abnormal 12 volt battery VSA modulator-control unit internal failure