DTC Troubleshooting

DTC Troubleshooting: P2647

DTC P2647: VTEC System Stuck ON

Special Tools Required

- Pressure gauge adapter 07NAJ-P07010A
- A/T low pressure gauge w/panel 07406-0070301
- A/T pressure hose, 2,210 mm 07AAJ-PY4A100
- A/T pressure adapter 07MAJ-PY40120
- Oil pressure hose 07ZAJ-S5AA200
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information. Reading and Clearing Diagnostic Trouble Codes

1. Check the engine oil level.

Is the engine oil level OK?
YES - Go to step 2.

NO - Adjust the engine oil to the proper level, then go to step 11.


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

3. Clear the DTC with the HDS.

4. 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 the rocker arm oil pressure sensor (EOP sensor), the rocker arm oil control solenoid, and the ECM/PCM.

NO - Go to step 5.


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

6. Remove the rocker arm oil pressure sensor (EOP sensor) (A), attach the special tools as shown, then attach the rocker arm oil pressure sensor (EOP sensor) to the oil pressure gauge adapter (B).
NOTE: Install the parts in the reverse order of removal with a new O-ring.

7. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle for 2 minutes.

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






9. Check the oil pressure.

Does the oil pressure increase to 392 kPa (56.9 psi, 4.0 kgf/cm2)?
YES - Replace the rocker arm oil pressure sensor (EOP sensor), Service and Repair then go to step 10.

NO - Replace the rocker arm oil control valve, Service and Repair then go to step 10.


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

11. Reconnect all connectors.

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

13. Reset the ECM/PCM with the HDS.

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

15. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle for 2 minutes.

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

Is DTC P2647 indicated?
YES - Check for poor connections or loose terminals at the rocker arm oil control solenoid, the rocker arm oil pressure sensor (EOP sensor), and the ECM/PCM, then go to step 1.

NO - Go to step 17.


17. Monitor the OBD STATUS for DTC P2647 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 16, go to the indicated DTC's troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the rocker arm oil control solenoid, the rocker arm oil pressure sensor (EOP sensor), and the ECM/PCM, then go to step 1. If the screen indicates NOT COMPLETED, go to step 15.