DTC Troubleshooting: U3006-16
DTC U3006-16: Power Source Failure for ECU (Low Voltage)
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
DTC
Freeze Frame
U3006-16 Power Source Failure for ECU (Low Voltage)
    

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.

?4.
Start the engine, and warm it up to normal operating temperature (the radiator fan comes on).

?5.
Test-drive the vehicle at 6 mph (10 km/h) or more for a few seconds.
NOTE: Drive the vehicle on the road, not on a lift.

?6.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
U3006-16 Power Source Failure for ECU (Low Voltage)
    

Is DTC U3006-16 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, then check the 12 volt battery. 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.
VSA modulator-control unit check:

VSA modulator-control unit check
?1.
Check and note the parameter(s) below with the HDS.
Signal
Current conditions
Values
Unit
BATTERY VOLTAGE
    

?2.
Using a voltmeter, measure and note the voltage across the 12 volt battery terminals.
NOTE: If the voltage is below 9.5 V, check the 12 volt battery, and check for any PGM-FI DTCs.

?3.
Compare the voltage noted in step 2-1 to the voltage in step 2-2.

Is the difference between the two voltage readings less than 3 V?

     
YES
     
     
     
     
NO
     
     
     
Go to step 3.
3.
Open wire check (IG1 VSA/ABS line):

Open wire check (IG1 VSA/ABS line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
VSA modulator-control unit 38P connector

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
VSA modulator-control unit 38P connector: disconnected
Test point 1
VSA modulator-control unit 38P connector No. 36
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
The IG1 ABS/VSA wire is OK. Go to step 4.
     
NO
     
     
     
Repair an open or high resistance in the wire between the No. B10 (7.5 A) fuse in the under-dash fuse/relay box and the VSA modulator-control unit.?
4.
VSA modulator-control unit check (update):

VSA modulator-control unit check (update)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Reconnect the following connector.
VSA modulator-control unit 38P connector

?3.
Update the VSA modulator-control unit if it does not have the latest software.

?4.
Turn the vehicle to the OFF (LOCK) mode.

?5.
Start the engine, and warm it up to normal operating temperature (the radiator fan comes on).

?6.
Test-drive the vehicle at 6 mph (10 km/h) or more for a few seconds.
NOTE: Drive the vehicle on the road, not on a lift.

?7.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
     

Is DTC U3006-16 indicated?

     
YES
     
     
     
Check for loose terminals and poor connections in the VSA modulator-control unit 38P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit.?
     
NO
     
     
     
Troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.?