Acura TSX / Honda Accord CL. Manual - part 596

REPLACEMENT ).  

7. Turn the ignition switch ON (II).  

8. Check the HO2S S2 in the DATA LIST with the HDS. 

Does the voltage stay at 0.29 V or less? 

YES: Go to step 11 .  

NO: Go to step 15 .  

9. Test-drive under the following conditions: 

z

Engine coolant temperature more than 158°F (70°C)  

z

A/T in D position (M/T in 4th gear)  

z

Engine speed at 2,000-3,000 RPM  

z

Drive about 10 minutes, then decelerate (with the throttle fully closed) for 5 seconds  

10. Monitor the OBD STATUS for DTC P0137 in the DTCs MENU with the HDS. 

Does the screen indicate FAILED? 

YES: Go to step 16 .  

NO: If the screen indicates PASSED, intermittent failure, system is OK at this time. If the 
screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates 
Out of CONDITION, go to step and recheck.  

11. Turn the ignition switch OFF.  

12. Jump the SCS line with the HDS.  

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

14. Check for continuity between Secondary HO2S (Sensor 2) 4P connector terminal No. 2 and body ground. 

Is there continuity? 

YES: Repair short in the wire between the ECM/PCM (E20) and the secondary HO2S 
(Sensor 2), then go to step 17 .  

NO: Go to step 24 . 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

Fig. 33: Checking For Continuity Between Secondary HO2S (Sensor 2) 4P Connector 
Terminal No. 2 & Body Ground 

15. Turn the ignition switch OFF.  

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

17. Turn the ignition switch ON (II).  

18. Reset the ECM/PCM with the HDS.  

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

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

fan comes on, then let it idle.  

21. Test-drive under the following conditions: 

z

Engine coolant temperature more than 158°F (70°C)  

z

A/T in D position (M/T in 5th gear)  

z

Engine speed at 2,000-3,000 RPM  

z

Drive about 10 minutes, then decelerate (with the throttle fully closed) for 5 seconds  

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

Are any Temporary DTCs or DTCs indicated?

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

YES: If DTC P0137 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 23.  

23. Monitor the OBD STATUS for DTC P0137 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 
EXECUTING, keep driving until a result comes on. If the screen indicates Out of 
CONDITION, go to step 20 and recheck.  

24. 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 ).  

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

fan comes on, then let it idle.  

26. Test-drive under the following conditions: 

z

Engine coolant temperature more than 158°F (70°C)  

z

A/T in D position (M/T in 5th gear)  

z

Engine speed at 2,000-3,000 RPM  

z

Drive about 10 minutes, then decelerate (with the throttle fully closed) for 5 seconds  

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

Are any Temporary DTCs or DTCs indicated? 

YES: If DTC P0137 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: 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 P0138: SECONDARY HO2S (SENSOR 2) CIRCUIT HIGH VOLTAGE 

1. Turn the ignition switch ON (II).  

2. Clear the DTC with the HDS.  

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

fan comes on, then let it idle.  

4. Check the HO2S S2 in the DATA LIST with the HDS. 

Does the voltage stay at 0.75 V or higher? 

YES: Go to step 7 .  

NO: Go to step 5.  

5. Test-drive under the following conditions: 

z

Engine coolant temperature more than 158°F (70°C) 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

z

A/T in D position (M/T in 5th gear)  

z

Engine speed at 2,000-3,000 RPM  

z

Drive about 10 minutes, then decelerate (with the throttle fully closed) for 5 seconds  

6. Monitor the OBD STATUS for DTC P0138 in the DTCs MENU with the HDS. 

Does the screen indicate FAILED? 

YES: Go to step 19 .  

NO: If the screen indicates PASSED, intermittent failure, system is OK at this time. If the 
screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates 
Out of CONDITION, go to step 5 and recheck.  

7. Turn the ignition switch OFF.  

8. Disconnect the Secondary HO2S (Sensor 2) 4P connector.  

9. Connect Secondary HO2S (Sensor 2) 4P connector terminals No. 1 and No. 2 with a jumper wire. 

Fig. 34: Connecting Secondary HO2S (Sensor 2) 4P Connector Terminals No. 1 & No. 2 With A 
Jumper Wire 

10. Turn the ignition switch ON (II).  

11. Check the HO2S S2 in the DATA LIST with the HDS. 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX