DTC Troubleshooting: U3003-16
DTC U3003-16: Battery Voltage Low
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
DTC
Freeze Frame
U3003-16 Battery Voltage Low
    

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Turn the vehicle to the OFF (LOCK) mode, then to the ON mode.

?4.
Wait 15 seconds.

?5.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
U3003-16 Battery Voltage Low
    

Is DTC U3003-16 indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the Freeze data/on-board snapshot.?
2.
Fuse check:

Fuse check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Check the following fuse.
Fuse
No. D1-1 (70 A)
Location
Auxiliary under-dash fuse box

Is the fuse OK?

     
YES
     
     
     
The fuse is OK. Reinstall the fuse, then go to step 3.
     
NO
     
     
     
Replace the fuse. If the fuse blows again, repair a short to ground in the No. D1-1 (70 A) fuse circuit.?
3.
Determine possible failure (EPS control unit connector C):

Determine possible failure (EPS control unit connector C)
?1.
Check for loose terminal and poor connection in the following connector.
EPS control unit connector C (2P)

Is the connector OK?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
Repair loose terminal or poor connection. Then clear the DTC by using the HDS and recheck DTC U3003-16. If DTC U3003-16 is not confirmed, troubleshooting is complete.?
4.
Open wire check (+B EPS line):

Open wire check (+B EPS line)
?1.
Disconnect the following connector.
EPS control unit connector C (2P)

?2.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
EPS control unit connector C (2P): disconnected
Test point 1
EPS control unit connector C (2P) No. 2
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
The +B EPS wire is OK. Go to step 5.
     
NO
     
     
     
Repair an open in the wire between the EPS control unit and the No. D1-1 (70 A) fuse.?
5.
EPS control unit check (update):

EPS control unit check (update)
?1.
Reconnect the following connector.
EPS control unit connector C (2P)

?2.
Update the EPS control unit if it does not have the latest software.

?3.
Turn the vehicle to the OFF (LOCK) mode, then to the ON mode.

?4.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
U3003-16 Battery Voltage Low
    

Is DTC U3003-16 indicated?

     
YES
     
     
     
Check for loose terminals and poor connections at the EPS control unit connectors. If the EPS control unit was updated and the symptom/indication is still present, replace the EPS motor/control unit.?
     
NO
     
     
     
Troubleshooting is complete.?