Acura TSX / Honda Accord CL. Manual — part 542

Fig. 11: Connecting EVAP Canister Purge Valve 2P Connector Terminal No. 2 To Body Ground
With A Jumper Wire

22. Check for continuity between ECM/PCM connector terminal B21 and body ground.

Is there continuity?

YES: Go to step 23.

NO: Repair open in the wire between the EVAP canister purge valve and the ECM/PCM
(B21), then go to step 25 .

2004 Acura TSX

2004 ENGINE PERFORMANCE EVAP System - TSX

Fig. 12: Checking For Continuity Between ECM/PCM Connector Terminal B21 & Body
Ground

23. Measure resistance between EVAP canister purge valve 2P connector terminals No. 1 and No. 2.

Is there about 33 ohm at room temperature?

YES: Go to step 31 .

NO: Go to step 24.

2004 Acura TSX

2004 ENGINE PERFORMANCE EVAP System - TSX

Fig. 13: Measuring Resistance Between EVAP Canister Purge Valve 2P Connector Terminals
No. 1 & No. 2

24. Replace the EVAP canister purge valve (see EVAP CANISTER PURGE VALVE REPLACEMENT ).

25. Reconnect ECM/PCM connector B (24P).

26. Reconnect the EVAP canister purge valve 2P connector.

27. Turn the ignition switch ON (II).

28. Reset the ECM/PCM with the HDS.

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

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

Are any Temporary DTCs or DTCs indicated?

YES: If DTC P0443 is indicated, check for poor connections or loose terminals at the EVAP
canister purge 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.

31. 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 ).

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

2004 Acura TSX

2004 ENGINE PERFORMANCE EVAP System - TSX

Are any Temporary DTCs or DTCs indicated?

YES: If DTC P0443 is indicated, check for poor connections or loose terminals at the EVAP
canister purge 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 P0451: FTP SENSOR RANGE/PERFORMANCE PROBLEM

1. Turn the ignition switch ON (II).

2. Clear the DTC with the HDS.

3. Start the engine, and let it idle for 1 minute.

4. Monitor the OBD STATUS for DTC P0451 in the DTCs MENU with the HDS.

Does the screen indicate FAILED?

YES: Go to step 5.

NO: If the screen indicates PASSED, intermittent failure, system is OK at this time. If the
screen indicates NOT COMPLETED, go to step 3 and recheck.

5. Turn the ignition switch OFF.

6. Replace the FTP sensor (see FTP SENSOR REPLACEMENT ).

7. Turn the ignition switch ON (II).

8. Reset the ECM/PCM with the HDS.

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

10. Start the engine, and let it idle for 1 minute.

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

Are any Temporary DTCs or DTCs indicated?

YES: If DTC P0451 is indicated, check for poor connections or loose terminals at the FTP
sensor 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: Go to step 12.

12. Monitor the OBD STATUS for DTC P0451 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES: Troubleshooting is complete.

NO: If the screen indicates FAILED, check for poor connections or loose terminals at the
FTP sensor and the ECM/PCM, then go to step 1 . If the screen indicates NOT
COMPLETED, go to step 10 and recheck.

DTC P0452: FTP SENSOR CIRCUIT LOW VOLTAGE

NOTE:

If DTC P2422 is stored at the same time as DTC P0451, troubleshoot DTC P2422
first, then recheck for DTC P0451.

2004 Acura TSX

2004 ENGINE PERFORMANCE EVAP System - TSX