Acura TSX / Honda Accord CL. Manual - part 594

Fig. 30: Checking For Continuity Between ECM/PCM Connector Terminal A31 & Body 
Ground 

14. Replace the A/F sensor (Sensor 1) (see A/F SENSOR REPLACEMENT ).  

15. Reconnect ECM/PCM connector A (31P).  

16. Turn the ignition switch ON (II).  

17. Reset the ECM/PCM with the HDS.  

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

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

Are any Temporary DTCs or DTCs indicated? 

YES: If DTC P1157 is indicated, check for poor connections or loose terminals at the A/F 
sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the connector and terminal fits are 
OK, go to step 21 . If any other Temporary DTCs or DTCs are indicated, go to the indicated 
DTC troubleshooting.  

NO: Go to step 20.  

20. Monitor the OBD STATUS for DTC P1157 in the DTCs MENU with the HDS. 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

Does the screen indicate PASSED? 

YES: Troubleshooting is complete.  

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

21. 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 ).  

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

Is DTC P1157 indicated? 

YES: Go to step 20 and recheck.  

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 P2195: A/F SENSOR (SENSOR 1) SIGNAL STUCK LEAN 

1. Inspect the condition of the A/F sensor (Sensor 1). 

Is it loose in the exhaust pipe? 

YES: Go to step 2.  

NO: Go to step 4 .  

2. Turn the ignition switch OFF.  

3. Reinstall the A/F sensor (Sensor 1) (see A/F SENSOR REPLACEMENT ).  

4. Turn the ignition switch ON (II).  

5. Reset the ECM/PCM with the HDS.  

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

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

Are any Temporary DTCs or DTCs indicated? 

YES: If DTC P2195 is indicated, check for poor connections or loose terminals at the A/F 
sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the connection and terminal fits 
are OK, go to step 8. If any other Temporary DTCs or DTCs are indicated, go to the 
indicated DTC troubleshooting.  

NO: Intermittent failure, system is OK at this time. Check for poor connections or loose 
terminals at the A/F sensor (Sensor 1) and the ECM/PCM.  

8. Monitor the OBD STATUS for DTC P2195 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 
A/F sensor (Sensor 1) and the ECM/PCM, then go to step 2 . If the screen indicates NOT 
COMPLETED, go to step 5 and recheck.  

DTC P2238: A/F SENSOR (SENSOR 1) AFS+ LINE LOW VOLTAGE 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

1. Turn the ignition switch ON (II).  

2. Clear the DTC with the HDS.  

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

Is DTC P2238 indicated? 

YES: Go to step 4.  

NO: Intermittent failure, system is OK at this time. Check for poor connections or loose 
terminals at the A/F sensor (Sensor 1) and the ECM/PCM.  

4. Turn the ignition switch OFF.  

5. Jump the SCS line with the HDS.  

6. Disconnect the A/F sensor (Sensor 1) 4P connector.  

7. Disconnect ECM/PCM connector A(31P).  

8. Check for continuity between ECM/PCM connector terminal A31 and body ground. 

Is there continuity? 

YES: Repair short in the wire between the ECM/PCM (A31) and the A/F sensor (Sensor 1), 
then go to step 11 .  

NO: Go to step 9.  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

Fig. 31: Checking For Continuity Between ECM/PCM Connector Terminal A31 And Body 
Ground 

9. Reconnect ECM/PCM connector A (31P).  

10. Replace the A/F sensor (Sensor 1) (see A/F SENSOR 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. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS. 

Are any Temporary DTCs or DTCs indicated? 

YES: If DTC P2238 is indicated, check for poor connections or loose terminals at the A/F 
sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the connector and terminal fits are 
OK, go to step 16 . If any other Temporary DTCs or DTCs are indicated, go to the indicated 
DTC troubleshooting.  

NO: Go to step 15.  

15. Monitor the OBD STATUS for DTC P2238 in the DTCs MENU with the HDS. 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX