Acura TSX / Honda Accord CL. Manual — part 597

Does the voltage stay at 0.75 V or higher?

YES: Go to step 12.

NO: Go to step 19 .

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 terminals E4 and E20.

Is there continuity?

YES: Go to step 28 .

NO: Go to step 16.

Fig. 35: Checking For Continuity Between ECM/PCM Connector Terminals E4 & E20

16. Remove the jumper wire from the secondary HO2S (Sensor 2) 4P connector.

17. Connect secondary HO2S (Sensor 2) 4P connector terminal No. 2 to body ground with a jumper wire.

2004 Acura TSX

2004 ENGINE PERFORMANCE PGM-FI System - TSX

Fig. 36: Connecting Secondary HO2S (Sensor 2) 4P Connector Terminal No. 2 To Body Ground
With A Jumper Wire

18. Check for continuity between ECM/PCM connector terminal E20 and body ground.

Is there continuity?

YES: Repair open in the wire between the ECM/PCM (E4) and the secondary HO2S (Sensor
2), then go to step 21 .

NO: Repair open in the wire between the ECM/PCM (E20) and the secondary HO2S (Sensor
2), then go to step 21 .

2004 Acura TSX

2004 ENGINE PERFORMANCE PGM-FI System - TSX

Fig. 37: Checking For Continuity Between ECM/PCM Connector Terminal E20 & Body
Ground

19. Turn the ignition switch OFF.

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

21. Turn the ignition switch ON (II).

22. Reset the ECM/PCM with the HDS.

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

24. 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.

25. 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

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

2004 Acura TSX

2004 ENGINE PERFORMANCE PGM-FI System - TSX

Are any Temporary DTCs or DTCs indicated?

YES: If DTC P0138 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 27.

27. Monitor the OBD STATUS for DTC P0138 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 24 and recheck.

28. 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 ).

29. With engine at operating temperature, (the radiator fans come on) let the engine idle for 10 minutes.

30. 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

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

Are any Temporary DTCs or DTCs indicated?

YES: If DTC P0138 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 P0139: SLOW RESPONSE IN SECONDARY HO2S (SENSOR 2) CIRCUIT

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. 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)

NOTE:

The engine must idle for 10 minutes in addition to the idle learn procedure.

2004 Acura TSX

2004 ENGINE PERFORMANCE PGM-FI System - TSX