DTC Troubleshooting: P16BB
DTC P16BB: Alternator B Terminal Circuit Low Voltage
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P16BB Alternator B Terminal Circuit Low Voltage
    

1.
Problem verification:

Problem verification
?1.
Record all the on-board snapshots with the HDS.

?2.
Turn the vehicle to the ON mode.

?3.
Clear the DTC with the HDS.


?4.
Start the engine.

?5.
Check under these conditions:
A/C on
Temperature control at maximum cool
Blower fan at maximum speed
Headlights on high beam
Rear window defogger on

?6.
Hold the engine speed at 2,000 rpm for 1 minute.

?7.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
P16BB Alternator B Terminal Circuit Low Voltage
    

Is DTC P16BB indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot. Also check the 12 volt battery performance.?
2.
+B terminal check:

+B terminal check
?1.
Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box (+B line).

Are the connections and terminals OK?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
Repair the connections or the terminals.?
3.
Open wire check (+B line):

Open wire check (+B line)
?1.
Check for an open in the wire between the alternator and the under-hood fuse/relay box at the engine wire harness.

Is the harness OK?

     
YES
     
     
     
     
NO
     
     
     
Repair an open in the +B wire between the alternator and the under-hood fuse/relay box.?