DTC Troubleshooting: P16BB
DTC P16BB: Alternator B Terminal Circuit Low Voltage
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

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

1.
Problem verification:

Problem verification
?1.
Press the engine start/stop button to select the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Start the engine.

?4.
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

?5.
Hold the engine speed at 2,000 rpm without load (A/T in P or N, M/T in neutral) for 1 minute.

?6.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
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. Also check the 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, then do the repair verification.
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 harness.

Is the harness OK?

     
YES
     
     
     
     
NO
     
     
     
Repair an open in the +B wire between the alternator and the under-hood fuse/relay box, then do the repair verification.
Repair verification:

?1.
Press the engine start/stop button to select the ON mode.

?2.
Reset the PCM with the HDS.


?3.
Do the PCM idle learn procedure.

?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 without load (A/T in P or N, M/T in neutral) for 1 minute.

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


Is DTC P16BB indicated?

     
YES
     
     
     
Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box, then go to step 1.
     
NO
     
     
     
Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.?