Acura TSX / Honda Accord CL. Manual - part 599

Fig. 40: Measuring Voltage Between Secondary HO2S 4P Connector Terminals No. 3 & No. 4

12. Turn the ignition switch OFF.  

13. Jump the SCS line with the HDS.  

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

15. Check for continuity between ECM/PCM connector terminal E21 and body ground. 

Is there continuity? 

YES: Repair short in the wire between the ECM/PCM (E21) and the secondary HO2S 
(Sensor 2), then go to step 24 .  

NO: Go to step 29 .  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

Fig. 41: Checking For Continuity Between ECM/PCM Connector Terminal E21 & Body 
Ground 

16. Measure voltage between secondary HO2S (Sensor 2) 4P connector terminal No. 4 and body ground. 

Is there battery voltage? 

YES: Go to step 17.  

NO: Check the No. 18 ACG (10A) fuse in the under-dash fuse/relay box. If the fuse is OK, 
repair open in the wire between the secondary HO2S (Sensor 2) and No. 4 ACG (10A) fuse, 
then go to step 24 .  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

Fig. 42: Measuring Voltage Between Secondary HO2S (Sensor 2) 4P Connector Terminal No. 4 & 
Body Ground 

17. Turn the ignition switch OFF.  

18. Jump the SCS line with the HDS.  

19. Reconnect the secondary HO2S (Sensor 2) 4P connector.  

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

21. Turn the ignition switch ON (II).  

22. Measure voltage between ECM/PCM connector terminals A5 and E21. 

Is there 0.1 V or less? 

YES: Repair open in the wire between the ECM/PCM (E21) and the secondary HO2S 
(Sensor 2), then go to step 25 .  

NO: Go to step 29 .  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

Fig. 43: Measuring Voltage Between ECM/PCM Connector Terminals A5 & E21 

23. Replace the secondary HO2S (Sensor 2) (see SECONDARY HO2S REPLACEMENT ).  

24. Turn the ignition switch ON (II).  

25. Reset the ECM/PCM with the HDS.  

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

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

Are any Temporary DTCs or DTCs indicated? 

YES: If DTC P0141 is indicated, check for poor connections or loose terminals at the 
secondary HO2S (Sensor 2) 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 28.  

28. Monitor the OBD STATUS for DTC P0141 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 
secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1 . If the screen indicates 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX