Acura TSX / Honda Accord CL. Manual - part 595

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 13 and recheck.

16. 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 ).

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

Is DTC P2238 indicated?

YES: Go to step 15 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 P2252: A/F SENSOR (SENSOR 1) AFS- LINE LOW VOLTAGE

1. Turn the ignition switch ON (II).

2. Clear the DTC with the HDS.

3. Start the engine.

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

Is DTC P2252 indicated?

YES: Go to step 5.

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.

5. Turn the ignition switch OFF.

6. Jump the SCS line with the HDS.

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

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

9. Check for continuity between ECM/PCM connector terminal A28 and body ground.

Is there continuity?

YES: Repair short in the wire between the ECM/PCM (A28) and the A/F sensor (Sensor 1),
then go to step 12 .

NO: Go to step 10.

2004 Acura TSX

2004 ENGINE PERFORMANCE PGM-FI System - TSX

Fig. 32: Checking For Continuity Between ECM/PCM Connector Terminal A28 & Body
Ground

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

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

12. Turn the ignition switch ON (II).

13. Reset the ECM/PCM with the HDS.

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

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

Are any Temporary DTCs or DTCs indicated?

YES: If DTC P2252 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 17 . If any other Temporary DTCs or DTCs are indicated, go to the indicated

2004 Acura TSX

2004 ENGINE PERFORMANCE PGM-FI System - TSX

DTC troubleshooting.

NO: Go to step 16.

16. Monitor the OBD STATUS for DTC P2252 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES: Troubleshooting is complete.

17. 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 ).

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

Is DTC P2252 indicated?

YES: Go to step 16 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 P2A00: A/F SENSOR (SENSOR 1) RANGE/PERFORMANCE PROBLEM

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 AF FB AVG in the DATA LIST with the HDS.

Is the value between 0.8-1.2?

YES: Go to step 5.

NO: Go to step 2 and recheck.

5. Test-drive under the following conditions:

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

A/T in D position (M/T in 3rd gear)

Vehicle speed at 26 MPH (41 km/h) or more, and engine speed at 3,250 RPM or less

Drive with the throttle fully opened for 5 seconds at an engine speed of 1,600 RPM, then slow
down with the throttle completely closed.

6. Monitor the OBD STATUS for DTC P2A00 in the DTCs MENU with the HDS.

Does the screen indicate FAILED?

YES: Go to step 7.

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 3 and recheck.

7. Turn the ignition switch OFF.

2004 Acura TSX

2004 ENGINE PERFORMANCE PGM-FI System - TSX

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

9. Turn the ignition switch ON (II).

10. Reset the ECM/PCM with the HDS.

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

12. Check the AF FB AVG in the DATA LIST with the HDS.

Is the value between 0.8-1.2?

YES: Go to step 13.

NO: Go to step 11 and recheck.

13. Test-drive under the following conditions:

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

A/T in D position (M/T in 3rd gear)

Vehicle speed at 26 MPH (41 km/h) or more, and engine speed at 3,250 RPM or less

Drive with the throttle fully opened for 5 seconds at an engine speed of 1,600 RPM, then slow
down with the throttle completely closed.

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

Are any Temporary DTCs or DTCs indicated?

YES: If DTC P2A00 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 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 P2A00 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 1 . If the screen indicates
EXECUTING, keep driving until a result comes on. If the screen indicates Out of
CONDITION, go to step 11 and recheck.

DTC P0137: SECONDARY HO2S (SENSOR 2) CIRCUIT LOW 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 0.29 V or less?

YES: Go to step 5.

NO: Go to step 9 .

5. Turn the ignition switch OFF.

6. Disconnect the secondary HO2S (Sensor 2) 4P connector (see SECONDARY HO2S

2004 Acura TSX

2004 ENGINE PERFORMANCE PGM-FI System - TSX

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