Acura TSX / Honda Accord CL. Manual - part 548

Fig. 28: Checking For Continuity Between ECM/PCM Connector Terminal E19 & Body 
Ground 

12. Replace the EVAP canister vent shut valve (see EVAP CANISTER VENT SHUT VALVE 

REPLACEMENT ).  

13. Reconnect ECM/PCM connector E (31P).  

14. Reconnect the EVAP canister vent shut valve 2P connector.  

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. Do the EVAP CVS ON in the INSPECTION MENU with the HDS.  

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

Are any Temporary DTCs or DTCs indicated? 

YES: If DTC P0498 is indicated, check for poor connections or loose terminals at the EVAP 
canister vent shut 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: Troubleshooting is complete. 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE EVAP System - TSX

  

 

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

HOW TO SUBSTITUTE THE ECM/PCM ).  

21. Do the EVAP CVS ON in the INSPECTION MENU with the HDS.  

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

Are any Temporary DTCs or DTCs indicated? 

YES: If DTC P0498 is indicated, check for poor connections or loose terminals at the EVAP 
canister vent shut 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 ).  

DTC P0499: EVAP CANISTER VENT SHUT VALVE CIRCUIT HIGH VOLTAGE 

1. Turn the ignition switch ON (II).  

2. Clear the DTC with the HDS, then wait 5 seconds.  

3. Do the EVAP CVS ON in the INSPECTION MENU with the HDS.  

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

Is DTC P0499 indicated? 

YES: Go to step 5.  

NO: Intermittent failure, system is OK at this time. Check for poor connections or loose 
terminals at the EVAP canister vent shut valve and the ECM/PCM.  

5. Turn the ignition switch OFF.  

6. Disconnect the EVAP canister vent shut valve 2P connector.  

7. Turn the ignition switch ON (II).  

8. Measure voltage between EVAP canister vent shut valve 2P connector terminal No. 2 and body ground. 

Is there battery voltage? 

YES: Go to step 9.  

NO: Repair open in the wire between the EVAP canister vent shut valve and the No. 18 
ACG (15A) fuse in the under-dash fuse/relay box, then go to step 17 .  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE EVAP System - TSX

  

 

Fig. 29: Measuring Voltage Between EVAP Canister Vent Shut Valve 2P Connector Terminal 
No. 2 & Body Ground 

9. Turn the ignition switch OFF.  

10. Measure resistance between EVAP canister vent shut valve 2P connector terminals No. 1 and No. 2. 

Is there about 25-30 ohm at room temperature? 

YES: Go to step 11.  

NO: Go to step 15 .  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE EVAP System - TSX

  

 

Fig. 30: Measuring Resistance Between EVAP Canister Vent Shut Valve 2P Connector 
Terminals No. 1 & No. 2 

11. Jump the SCS line with the HDS.  

12. Disconnect ECM/PCM connector E (31P).  

13. Connect EVAP canister vent shut valve 2P connector terminal No. 1 to body ground with a jumper wire. 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE EVAP System - TSX