DTC Troubleshooting

DTC Troubleshooting: P128A

DTC P128A:

Valve Pause System (VPS) Stuck OFF

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).

2. Clear the DTC with the HDS.

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

Is DTC P1289 or P2651 indicated?

YES -

Go to the indicated DTC's troubleshooting.�

NO -

Go to step 4.

4. Turn the ignition switch to LOCK (0).

5. Check the engine oil level.

Is the level OK?

YES -

Go to step 6.

NO -

Adjust the engine oil to the proper level, then go to step 11.

6. Turn the ignition switch to ON (II).

7. Clear the DTC with the HDS.

8. Do the VTEC TEST in the INSPECTION MENU with the HDS.

Is the result OK?

YES -

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at rocker arm oil control solenoid 1, rocker arm oil control solenoid 2, the rocker arm oil pressure switch, the rocker arm oil pressure sensor, and the PCM.�

NO -

Depending on the result, replace the appropriate part, then go to step 9:

- ENGINE OIL PRESSURE SENSOR HIGH VOLTAGE: Rocker arm oil pressure sensor Service and Repair
- ROCKER ARM OIL CONTROL SOLENOID 1 STUCK OFF: Rocker arm oil control valve Service and Repair

9. Turn the ignition switch to LOCK (0).

10. Reconnect all connectors.

11. Turn the ignition switch to ON (II).

12. Reset the PCM with the HDS.

13. Do the PCM idle learn procedure PCM Idle Learn Procedure.

14. Do the VTEC TEST in the INSPECTION MENU with the HDS.

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

Is DTC P128A indicated?

YES -

Check for poor connections or loose terminals at rocker arm oil control solenoid 1, rocker arm oil control solenoid 2, the rocker arm oil pressure switch, the rocker arm oil pressure sensor, and the PCM, then go to step 1.

NO -

Go to step 16.

16. Monitor the OBD STATUS for DTC P128A in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES -

Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 15, go to the indicated DTC's troubleshooting.�

NO -

If the screen indicates FAILED, check for poor connections or loose terminals at rocker arm oil control solenoid 1, rocker arm oil control solenoid 2, the rocker arm oil pressure switch, the rocker arm oil pressure sensor, and the PCM, then go to step 1. If the screen indicates EXECUTING, keep testing until a result comes on. If the screen indicates OUT OF CONDITION, go to step 14.