Acura RL. Manual - part 854

NO -Go to step 4.

4. Turn the ignition switch OFF.

5. Disconnect the rocker arm oil control solenoid (VTEC solenoid valve) 1P connector.

6. At the solenoid side, measure resistance between the rocker arm oil control solenoid (VTEC solenoid

valve) 1P connector terminal and the solenoid valve body.

Fig. 7: Measuring Resistance Between Rocker Arm Oil Control Solenoid 1P Connector
Terminal
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there 14-30 ohms at room temperature?

YES -Go to step 7.

NO -Go to step 10.

7. Jump the SCS line with the HDS.

8. Disconnect PCM connector A (31P).

9. Check for continuity between PCM connector terminal A22 and body ground.

Fig. 8: Checking Continuity Between PCM Connector Terminal A22 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair short in the wire between the PCM (A22) and the rocker arm oil control solenoid (VTEC
solenoid valve), then go to step 11.

2007 Acura RL

2005-08 ENGINE PERFORMANCE VTEC - RL

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NO -Go to step 18.

10. Replace the rocker arm oil control solenoid (VTEC solenoid valve) (see ROCKER ARM OIL

CONTROL SOLENOID (VTEC SOLENOID VALVE) REPLACEMENT ).

11. Reconnect all connectors.

12. Turn the ignition switch ON (II).

13. Reset the PCM with the HDS.

14. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).

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

16. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2648 indicated?

YES -Check for poor connections or loose terminals at the rocker arm oil control solenoid (VTEC
solenoid valve) and the PCM, then go to step 1.

NO -Go to step 17.

17. Monitor the OBD STATUS for DTC P2648 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES -Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 16,
go to the indicated DTCs troubleshooting.

NO -If the screen indicates FAILED, check for poor connections or loose terminals at the rocker arm
oil control solenoid (VTEC solenoid valve) and the PCM, then go to step 1. If the screen indicates
NOT COMPLETED, keep idling until a result comes on.

18. Reconnect all connectors.

19. Update the PCM if it does not have the latest software (see UPDATING THE PCM ), or substitute a

known-good PCM (see SUBSTITUTING THE PCM ).

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

21. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2648 indicated?

YES -Check for poor connections or loose terminals at the rocker arm oil control solenoid (VTEC
solenoid valve) and the PCM. If the PCM was updated, substitute a known-good PCM (see
SUBSTITUTING THE PCM ), then recheck. If the PCM was substituted, go to step 1.

NO -Go to step 22.

22. Monitor the OBD STATUS for DTC P2648 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the

2007 Acura RL

2005-08 ENGINE PERFORMANCE VTEC - RL

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original PCM (see PCM REPLACEMENT ). If any other Temporary DTCs or DTCs were indicated
in step 20, go to the indicated DTCs troubleshooting.

NO -If the screen indicates FAILED, check for poor connections or loose terminals at the rocker arm
oil control solenoid (VTEC solenoid valve) and the PCM. If the PCM was updated, substitute a
known-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the PCM was substituted, go
to step 1. If the screen indicates NOT COMPLETED, keep idling until a result comes on.

DTC P2649: ROCKER ARM OIL CONTROL SOLENOID (VTEC SOLENOID VALVE) CIRCUIT
HIGH VOLTAGE

1. Turn the ignition switch ON (II).

2. Clear the DTC with the HDS.

3. Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the

radiator fan comes on, then let it idle.

4. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2649 indicated?

YES -Go to step 5.

NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals
at the rocker arm oil control solenoid (VTEC solenoid valve) and the PCM.

5. Turn the ignition switch OFF.

6. Disconnect the rocker arm oil control solenoid (VTEC solenoid valve) 1P connector.

7. At the solenoid side, measure resistance between the rocker arm oil control solenoid (VTEC solenoid

valve) 1P connector terminal and the solenoid valve body.

Fig. 9: Measuring Resistance Between Rocker Arm Oil Control Solenoid 1P Connector
Terminal
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there 14-30 ohms at room temperature?

NOTE:

Before you troubleshoot, record all freeze data and any on-board snapshot,
and review the general troubleshooting information (see GENERAL
TROUBLESHOOTING INFORMATION ).

2007 Acura RL

2005-08 ENGINE PERFORMANCE VTEC - RL

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YES -Go to step 8.

NO -Go to step 12.

8. Jump the SCS line with the HDS.

9. Disconnect PCM connector A (31P).

10. Connect the rocker arm oil control solenoid (VTEC solenoid valve) 1P connector terminal to body

ground with a jumper wire.

Fig. 10: Checking Rocker Arm Oil Control Solenoid 1P Connector Terminal To Body Ground
With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.

11. Check for continuity between PCM connector terminal A22 and body ground.

Fig. 11: Checking Continuity Between PCM Connector Terminal A22 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 20.

NO -Repair open in the wire between the PCM (A22) and the rocker arm oil control solenoid (VTEC
solenoid valve), then go to step 13.

12. Replace the rocker arm oil control solenoid (VTEC solenoid valve) (see ROCKER ARM OIL

CONTROL SOLENOID (VTEC SOLENOID VALVE) REPLACEMENT ).

13. Reconnect all connectors.

14. Turn the ignition switch ON (II).

2007 Acura RL

2005-08 ENGINE PERFORMANCE VTEC - RL

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