DTC Troubleshooting

DTC Troubleshooting: P16BB, 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 Initial Inspection and Diagnostic Overview.

1. Turn the ignition switch to ON (II), or 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 (A/T in P or N, M/T in neutral) 1 minute.

6. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P16BB indicated?

YES -

Go to step 7.

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, and check the battery performance Testing and Inspection.�

7. 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 8.

NO -

Repair the connections or the terminals, then go to step 9.

8. 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 -

Replace the alternator Removal and Replacement, then go to step 9.

NO -

Repair open in the wire between the alternator and the under-hood fuse/relay box, then go to step 9.

9. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

10. Reset the ECM/PCM with the HDS.

11. Do the ECM/PCM idle learn procedure ECM/PCM Idle Learn Procedure.

12. Start the engine.

13. 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

14. Hold the engine speed at 2,000 rpm (A/T in P or N, M/T in neutral) 1 minute.

15. Check for Pending or Confirmed DTCs with the HDS.

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.�