Content .. 850 851 852 853 ..

Acura RL. Manual - part 852

2005-08 ENGINE PERFORMANCE

VTEC - RL

COMPONENT LOCATION INDEX

Fig. 1: Identifying VTEC Component Location
Courtesy of AMERICAN HONDA MOTOR CO., INC.

DTC TROUBLESHOOTING

DTC P2646: ROCKER ARM OIL PRESSURE SWITCH (VTEC OIL PRESSURE SWITCH)
CIRCUIT LOW VOLTAGE

Special Tools Required



Pressure gauge adapter 07NAJ-P07010A



A/T low pressure gauge w/panel 07406-0070301



A/T pressure hose 07406-0020201



A/T pressure hose, 2,210 mm 07MAJ-PY4011A



A/T pressure adapter 07MAJ-PY40120



Oil pressure hose 07ZAJ-S5AA200

2007 Acura RL

2005-08 ENGINE PERFORMANCE VTEC - RL

2007 Acura RL

2005-08 ENGINE PERFORMANCE VTEC - RL

Friday, June 05, 2009 2:35:54 PM

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Friday, June 05, 2009 2:35:59 PM

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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 20.

2. Turn the ignition switch 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 switch (VTEC oil pressure switch), the rocker arm oil control
solenoid (VTEC solenoid valve), and the PCM.

NO -Go to step 5.

5. Turn the ignition switch OFF.

6. Disconnect the rocker arm oil pressure switch (VTEC oil pressure switch) 2P connector.

7. Turn the ignition switch ON (II).

8. Check the VTEC PRES SW in the DATA LIST with the HDS.

Is the result OK?

YES -Go to step 14.

NO -Go to step 9.

9. Turn the ignition switch OFF.

10. Remove the rocker arm oil pressure switch (VTEC oil pressure switch) (A) and install the special

tools as shown, then attach the rocker arm oil pressure switch (VTEC oil pressure switch) to the oil
pressure gauge adapter (B).

NOTE:

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

NOTE:

Install the parts in the reverse order of removal with a new O-ring.

2007 Acura RL

2005-08 ENGINE PERFORMANCE VTEC - RL

Friday, June 05, 2009 2:35:54 PM

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Fig. 2: Identifying VTEC Oil Pressure Switch And Oil Pressure Gauge Adapter With Torque
Specifications
Courtesy of AMERICAN HONDA MOTOR CO., INC.

11. Start the engine.

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

13. Check the oil pressure.

Does the oil pressure increase to at least 392 kPa (4.0 kgf/cm

, 56.9 psi)?

YES -Replace the rocker arm oil pressure switch (VTEC oil pressure switch) (see ROCKER ARM
OIL PRESSURE SWITCH (VTEC OIL PRESSURE SWITCH)
REMOVAL/INSTALLATION ), then go to step 18.

NO -Inspect the VTEC system. If it is OK. Replace the rocker arm oil control solenoid (VTEC
solenoid valve) (see ROCKER ARM OIL CONTROL SOLENOID (VTEC SOLENOID
VALVE) REPLACEMENT ), then go to step 18.

14. Turn the ignition switch OFF.

15. Jump the SCS line with the HDS.

16. Disconnect PCM connector A (31P).

17. Check for continuity between PCM connector terminal A23 and body ground.

Fig. 3: Checking Continuity Between PCM Connector Terminal A23 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

2007 Acura RL

2005-08 ENGINE PERFORMANCE VTEC - RL

Friday, June 05, 2009 2:35:54 PM

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Is there continuity?

YES -Repair short in the wire between the PCM (A23) and the rocker arm oil pressure switch (VTEC
oil pressure switch), then go to step 18.

NO -Go to step 25.

18. Reconnect all connectors.

19. Turn the ignition switch ON (II).

20. Reset the PCM with the HDS.

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

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

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

Is DTC P2646 indicated?

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

NO -Go to step 24.

24. Monitor the OBD STATUS for DTC P2646 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 23,
go to the indicated DTCs troubleshooting.

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

25. Reconnect all connectors.

26. 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 ).

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

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

Is DTC P2646 indicated?

YES -Check for poor connections or loose terminals at the rocker arm oil pressure switch (VTEC oil
pressure switch) 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 29.

29. Monitor the OBD STATUS for DTC P2646 in the DTCs MENU with the HDS.

2007 Acura RL

2005-08 ENGINE PERFORMANCE VTEC - RL

Friday, June 05, 2009 2:35:54 PM

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Content .. 850 851 852 853 ..