Acura TSX / Honda Accord CL. Manual - part 601

Fig. 44: Installing The Special Tools, Then Installing The VTEC Oil Pressure Switch In The 
Pressure Gauge Adapter 

17. Reconnect the VTEC oil pressure switch 2P connector.  

18. Start the engine. Hold the engine at 3,000 RPM with no load (in Park or neutral) until the radiator fan 

comes on.  

19. Check the oil pressure at engine speeds of 1,000 and 2,000 RPM. Keep the test time as short as possible 

(less than 1 minute) because the engine is running with no load. 

Is the oil pressure below 49 kPa (0.5 kgf/cm

2

 , 7 psi)? 

YES: Check the fuel pressure (see FUEL PRESSURE TEST ), and repair as needed, then 
go to step 20.  

NO: Inspect the VTEC system, then go to step 20.  

20. Turn the ignition switch ON (II).  

21. Reset the ECM/PCM with the HDS.  

22. Clear the CKP pattern with the HDS. 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

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

24. Do the CKP pattern learn procedure (see CKP PATTERN CLEAR/CKP PATTERN LEARN 

PROCEDURE ).  

25. Test-drive the vehicle for several minutes in the range of the recorded freeze data.  

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

Are any Temporary DTCs or DTCs indicated? 

YES: If DTC P0300, P0301, P0302, P0303, or P0304 are indicated, check for poor 
connections or loose terminals at the ignition coil, the injector, and the ECM/PCM, then go 
to troubleshooting DTC P0301, P0302, P0303, or P0304 (see 

DTC P0301: NO. 1 

CYLINDER MISFIRE; DTC P0302: NO. 2 CYLINDER MISFIRE; DTC P0303: NO. 3 
CYLINDER MISFIRE; DTC P0304: NO. 4 CYLINDER MISFIRE

 ). If any other 

Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.  

NO: Go to step 27.  

27. Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS. 

Does the screen indicate PASSED? 

YES: Troubleshooting is complete.  

NO: If the screen indicates FAILED, go to step 1 and recheck. If the screen indicates 
EXECUTING, keep driving until a result comes on. If the screen indicates Out of 
CONDITION, go to step 25 and recheck.  

DTC P0301: NO. 1 CYLINDER MISFIRE; DTC P0302: NO. 2 CYLINDER MISFIRE; DTC P0303: NO. 
3 CYLINDER MISFIRE; DTC P0304: NO. 4 CYLINDER MISFIRE 

1. Note the following freeze data: 

z

Engine speed  

z

Vehicle speed  

z

Throttle position  

z

CLV  

z

Gear position  

2. Clear the DTC with the HDS.  

3. Start the engine with no load (in Park or neutral), then let it idle.  

4. Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS. 

Does the screen indicate FAILED? 

YES: Go to step 9 .  

NO: If the screen indicates PASSED, go to step 5. If the screen indicates EXECUTING, 
keep driving until a result comes on. If the screen indicates Out of CONDITION, wait for 
several minutes, and recheck.  

5. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA 

LIST for 10 minutes with the HDS. 

Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show 
misfire counts? 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

YES: Go to step 9 .  

NO: Go to step 6.  

6. Test-drive the vehicle for several minutes in the range of the recorded freeze data.  

7. Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS. 

Does the screen indicate FAILED? 

YES: Go to step 9 .  

NO: If the screen indicates PASSED, go to step 8. If the screen indicates EXECUTING, 
keep driving until a result comes on. If the screen indicates Out of CONDITION, go to step 6 
and recheck.  

8. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA 

LIST for 10 minutes with the HDS. 

Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show 
misfire counts? 

YES: Go to step 9.  

NO: Intermittent failure, system is OK at this time.  

9. Turn the ignition switch OFF.  

10. Remove the intake manifold cover (see step 3 of REMOVAL ).  

11. Start the engine, and listen for a clicking sound at the injector of the problem cylinder. 

Does the injector click? 

YES: Go to step 12.  

NO: Go to step 43 .  

12. Turn the ignition switch OFF.  

13. Exchange the ignition coil from the problem cylinder with one from another cylinder.  

14. Test-drive the vehicle for several minutes in the range of the recorded freeze data.  

15. Check the CYL 1 MISFIRE, CYL 2 MISFIRE, CYL 3 MISFIRE, and/or CYL 4 MISFIRE in the DATA 

LIST for 10 minutes with the HDS. 

Does CYL 1 MISFIRE, CYL 2 MISFIRE, CYL 3 MISFIRE, and/or CYL 4 MISFIRE show 
misfire counts? 

YES: Go to step 16.  

NO: Intermittent misfire due to poor contact at the ignition coil connector (no misfire at this 
time). Make sure the coil connections are secure.  

16. Determine which cylinder had the misfire. 

Does the misfire occur in the cylinder where the ignition coil was moved? 

YES: Replace the faulty ignition coil (see IGNITION COIL 
REMOVAL/INSTALLATION ), then go to step 63 .  

NO: Go to step 17.  

17. Turn the ignition switch OFF.  

18. Exchange the spark plug from the problem cylinder with one from another cylinder.  

19. Test-drive the vehicle for several minutes in the range of the recorded freeze data.  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

20. Check the CYL 1 MISFIRE, CYL 2 MISFIRE, CYL 3 MISFIRE, and/or CYL 4 MISFIRE in the DATA 

LIST for 10 minutes with the HDS. 

Does CYL 1 MISFIRE, CYL 2 MISFIRE, CYL 3 MISFIRE, and/or CYL 4 MISFIRE show 
misfire counts? 

YES: Go to step 21.  

NO: Intermittent misfire due to spark plug fouling (no misfire at this time).  

21. Determine which cylinder had the misfire. 

Does the misfire occur in the cylinder where the spark plug was moved? 

YES: Replace the faulty spark plug, then go to step 63 .  

NO: Go to step 22.  

22. Turn the ignition switch OFF.  

23. Exchange the injector from the problem cylinder with one from another cylinder.  

24. Start the engine, and let it idle for 2 minutes.  

25. Test-drive the vehicle for several minutes in the range of the recorded freeze data.  

26. Check the CYL 1 MISFIRE, CYL 2 MISFIRE, CYL 3 MISFIRE, and/or CYL 4 MISFIRE in the DATA 

LIST for 10 minutes with the HDS. 

Does CYL 1 MISFIRE, CYL 2 MISFIRE, CYL 3 MISFIRE, and/or CYL 4 MISFIRE show 
misfire counts? 

YES: Go to step 27.  

NO: Intermittent misfire due to bad contact in the injector connector (no misfire at this time). 
Check for poor connections or loose terminals at the injector.  

27. Determine which cylinder had the misfire. 

Does the misfire occur in the cylinder where the injector was moved? 

YES: Replace the faulty injector (see INJECTOR REPLACEMENT ), then go to step 63 . 

NO: Go to step 28.  

28. Turn the ignition switch OFF.  

29. Disconnect the ignition coil 3P connector from the problem cylinder.  

30. Turn the ignition switch ON (II).  

31. Measure voltage between ignition coil 3P connector terminal No. 3 and body ground. 

Is there battery voltage? 

YES: Go to step 32.  

NO: Repair open in the wire between the ignition coil and the No. 1 ignition coil (15A) fuse 
relay, then go to step 63 . 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX