DTC Troubleshooting

DTC Troubleshooting: P1024

DTC P1024:

Valve Pause System (VPS) Sticking On

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. Try to start the engine.

Does the engine start and idle smoothly?

YES -

Go to step 4.

NO -

Go to step 8.

4. Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.

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

6. After testing, hold the engine speed at 2,500 rpm without load (in P or N).

7. Monitor the OBD STATUS for DTC P1024 in the DTCs MENU with the HDS.

Does the screen indicate FAILED?

YES -

Go to step 8.

NO -

If the screen indicates PASSED, 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. If the screen indicates EXECUTING, keep testing until a result comes on. If the screen indicates OUT OF CONDITION, go to step 4 and recheck.

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

9. Remove the cylinder head cover.

10. Check the rocker arm operation.

Are any rocker arms locked?

YES -

Go to step 11.

NO -

Go to step 12.

11. Check the rocker arms, the synchronizing pistons, and the lost motion assembly VTEC Rocker Arm Test.

Are they OK?

YES -

Go to step 12.

NO -

Repair the rocker arm assembly, then go to step 13.

12. Do the VTEC rocker arm test VTEC Rocker Arm Test.

Is the VTEC rocker arm OK?

YES -

Check the rocker arm operation again, then go to step 13.

NO -

Replace the rocker arm assembly, then go to step 13.

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

14. Reset the PCM with the HDS.

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

16. Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.

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

18. After testing, hold the engine speed at 2,500 rpm without load (in P or N).

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

Is DTC P1024 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 20.

20. Monitor the OBD STATUS for DTC P1024 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 19, 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 16.