Acura TSX / Honda Accord CL. Manual - part 636

Is the VTC oil control solenoid valve OK? 

YES: Go to step 11.  

NO: Replace the VTC oil control solenoid valve (see VTC OIL CONTROL SOLENOID 
VALVE REMOVAL/TEST/INSTALLATION ), then go to step 14 .  

11. Check the camshaft timing (see step 1 of CAM CHAIN INSTALLATION ). 

Is the camshaft timing OK? 

YES: Go to step 12.  

NO: Reset the camshaft timing (see CAM CHAIN INSTALLATION ), then go to step 14 . 

12. Check for damage to the cam chain (see COMPONENT LOCATION INDEX ). 

Is the cam chain damaged? 

YES: Replace the cam chain (see CAM CHAIN INSTALLATION ), then go to step 14 .  

NO: Go to step 13.  

13. Inspect the VTC actuator (see VTC ACTUATOR INSPECTION ). 

Is the actuator OK? 

YES: Go to step 14.  

NO: Replace the VTC actuator (see VTC ACTUATOR, EXHAUST CAMSHAFT 
SPROCKET REPLACEMENT ), then go to step 14.  

14. Turn the ignition switch ON (II).  

15. Reset the ECM/PCM with the HDS.  

16. Clear the CKP pattern with the HDS.  

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

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

PROCEDURE ).  

19. Test-drive at a steady speed between 19-38 MPH (30-60 km/h) for 10 minutes.  

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

Are any Temporary DTCs or DTCs indicated? 

YES: If DTC P0341 is indicated, check for poor connections or loose terminals at the VTC 
oil control 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: Go to step 21.  

21. Monitor the OBD STATUS for DTC P0341 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 
VTC oil control solenoid valve and the ECM/PCM, then go to step 1 . If the screen indicates 
NOT COMPLETED, go to step 19 and recheck.  

DTC P0344: CMP SENSOR A INTERMITTENT INTERRUPTION 

1. Note the following freeze data. 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE VTEC/VTC - TSX

  

 

z

Engine speed  

z

Vehicle speed  

2. Clear the DTC with the HDS.  

3. Start engine, and let it idle for 10 seconds.  

4. Check the CMP NOISE A COUNT in the DATA LIST with the HDS. 

Are 0 counts indicated? 

YES: Go to step 7 .  

NO: Go to step 5.  

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

6. Check the CMP NOISE A COUNT in the DATA LIST with the HDS. 

Are 0 counts indicated? 

YES: Go to step 7.  

NO: Intermittent failure, system is OK at this time. Check for poor connections or loose 
terminals at CMP Sensor A and the ECM/PCM.  

7. Check for poor or loose connections and terminals at these locations: 

z

CMP sensor A  

z

ECM/PCM  

z

Engine ground  

z

Body ground 

Are the connections and terminals OK? 

YES: Go to step 8.  

NO: Repair the connectors or terminals, then go to step 11 .  

8. Check for damage on the CMP sensor A pulse plate (see CMP PULSE PLATE A REPLACEMENT ). 

Is the pulse plate damaged? 

YES: Replace the CMP sensor A pulse plate (see CMP PULSE PLATE A 
REPLACEMENT ), then go to step 11 .  

NO: Go to step 9.  

9. Turn the ignition switch OFF.  

10. Replace CMP sensor A (see CMP SENSOR A REPLACEMENT ).  

11. Turn the ignition switch ON (II).  

12. Reset the ECM/PCM with the HDS.  

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

14. Start the engine, and let it idle for 10 seconds.  

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

Are any Temporary DTCs or DTCs indicated? 

YES: If DTC P0344 is indicated, check for poor connections or loose terminals at CMP 
Sensor A 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: Troubleshooting is complete.  

DTC P2646: OIL PRESSURE SWITCH CIRCUIT LOW VOLTAGE 

Special Tools Required:  

z

Pressure gauge adapter 07NAJ-P07010A  

z

A/T low pressure gauge w/panel 07406-0070300  

z

A/T pressure hose 07406-0020201  

z

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

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A/T pressure adapter 07MAJ-PY40120  

z

Oil pressure hose 07ZAJ-S5A0200  

1. Check the engine oil level. 

Is the level OK? 

YES: Go to step 2.  

NO: Adjust the engine oil to the proper level, then go to step 21 .  

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, system in OK at this time. Check for poor connections or loose 
terminals at the VTEC oil pressure switch, the VTEC solenoid valve, and the ECM/PCM.  

NO: Go to step 5.  

5. Turn the ignition switch OFF.  

6. Disconnect the 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 SWITCH ON indicated? 

YES: Go to step 9.  

NO: Replace the VTEC oil pressure switch (see VTEC OIL PRESSURE SWITCH 
REPLACEMENT ), then go to step 21 .  

9. Turn the ignition switch OFF.  

10. Remove the VTEC oil pressure switch (A) and install the special tools as shown, then install the VTEC 

oil pressure switch (A) to the oil pressure gauge adapter (B). 

NOTE:

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

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE VTEC/VTC - TSX

  

 

Fig. 13: Removing The VTEC Oil Pressure Switch & Installing The Special Tools & Installing The 
VTEC Oil Pressure Switch To The Oil Pressure Gauge Adapter 

11. Turn the ignition switch ON (II).  

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

13. Check the oil pressure. 

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

2

 , 7 psi)? 

YES: Inspect the VTEC system. If it is OK, replace the VTEC solenoid valve (see VTEC 
SOLENOID VALVE REMOVAL/INSTALLATION ), then go to step 21 .  

NO: Go to step 14.  

14. Turn the ignition switch OFF.  

15. Jump the SCS line with the HDS.  

16. Disconnect the VTEC oil pressure switch 2P connector.  

17. Disconnect ECM/PCM connector B (24P).  

18. Check for continuity between ECM/PCM connector terminal B11 and body ground. 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE VTEC/VTC - TSX