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 start the engine.

?4.
Wait 15 seconds or more.

?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. Refer to intermittent failures troubleshooting. 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.
Power source performance check:

Power source performance check
?1.
Check and note the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
BATTERY VOLTAGE
About 8.9
V
    

Do the current condition(s) match the threshold?

     
YES
     
     
     
     
NO
     
     
     
Go to step 3.
3.
Fuse check:

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

?2.
Check the following fuse.
Fuse
No. A2-1

Is the fuse OK?

     
YES
     
     
     
The fuse is OK. Reinstall the fuse, then go to step 4.
     
NO
     
     
     
Replace the fuse. If the fuse blows again, repair a short to ground in the No. A2-1 fuse circuit.?
4.
Open wire check (+B EPS line):

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

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

Is there battery voltage?

     
YES
     
     
     
Check for loose terminals and poor connections at the EPS control unit connectors. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good EPS motor/control unit, then recheck. If the symptom/indication goes away with a known-good EPS motor/control unit, replace the original EPS motor/control unit.?
     
NO
     
     
     
Repair an open in the wire between the under-hood fuse/relay box and the EPS control unit.?