Acura TSX / Honda Accord CL. Manual - part 640

Fig. 22: Connecting VTEC Solenoid Valve 2P Connector Terminal No. 1 To Body Ground With A 
Jumper Wire 

12. Check for continuity between ECM/PCM connector terminal B6 and body ground. 

Is there continuity? 

YES: Go to step 20 .  

NO: Repair open in the wire between the ECM/PCM (B6) and the VTEC solenoid valve, 
then go to step 14 .  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE VTEC/VTC - TSX

  

 

Fig. 23: Checking For Continuity Between ECM/PCM Connector Terminal B6 & Body 
Ground 

13. Replace the VTEC solenoid valve (see VTEC SOLENOID VALVE REMOVAL/INSTALLATION ). 

14. Reconnect all connectors.  

15. Turn the ignition switch ON (II).  

16. Reset the ECM/PCM with the HDS.  

17. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).  

18. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS. 

Are any Temporary DTCs or DTCs indicated? 

YES: If DTC P2649 is indicated, check for poor connections or loose terminals at the VTEC 
solenoid valve and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs 
are indicated, go to the indicated DTC troubleshooting. 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE VTEC/VTC - TSX

  

 

NO: Go to step 19.  

19. Monitor the OBD STATUS for DTC P2649 in the DTCs MENU with the HDS. 

Does the screen indicate PASSED? 

YES: Troubleshooting is complete.  

NO: If the screen indicated FAILED, go to step 1 and recheck. If the screen indicates NOT 
COMPLETED, go to step 17 and recheck.  

20. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see 

ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING ).  

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

Are any Temporary DTCs or DTCs indicated? 

YES: If DTC P2647 is indicated, check for poor connections or loose terminals at the VTEC 
solenoid valve and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs 
are indicated, go to the indicated DTC troubleshooting.  

NO: If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was 
substituted, replace the original ECM/PCM (see HOW TO REMOVE THE ECM/PCM 
FOR TESTING ).  

VTC OIL CONTROL SOLENOID VALVE REMOVAL/TEST/INSTALLATION 

1. Disconnect the VTC oil control solenoid valve connector (A). 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE VTEC/VTC - TSX

  

 

Fig. 24: Disconnecting The VTC Oil Control Solenoid Valve Connector 

2. Remove the bolt (B) and VTC oil control solenoid valve (C).  

3. Check the VTC oil control solenoid valve for sticking and the solenoid valve filter for clogging. If the 

valve is stuck or clogged, replace the VTC oil control solenoid valve.  

4. Check clearance between the port (advance side) and the valve. Make sure the valve (A) closes fully. 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE VTEC/VTC - TSX