Acura TSX / Honda Accord CL. Manual - part 528

NO - Troubleshooting is complete.

14. 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 ).

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

Are any Temporary DTCs or DTCs indicated?

YES - If DTC P2128 is indicated, check for poor connections or loose terminals at APP sensor B 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 P2138: APP SENSOR A/B INCORRECT VOLTAGE CORRELATION

1. Turn the ignition switch ON (II).

2. Clear the DTC with HDS.

3. Press the accelerator pedal to the floor.

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

Is DTC P2138 indicated?

YES - Go to step 5.

NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at
APP sensors and at the ECM/PCM.

5. Check APP SENSOR-A and APP SENSOR-B in the DATA LIST with the HDS.

Are they the same voltage?

YES - Go to step 6.

NO - Go to step 11.

6. Turn the ignition switch OFF.

7. Jump the SCS line with the HDS.

8. Disconnect the APP sensor 6P connector.

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

10. Check for continuity between ECM/PCM connector terminals A25 and A26.

2004 Acura TSX

2004 ENGINE PERFORMANCE Electronic Throttle Control System - TSX

Fig. 41: Checking For Continuity Between ECM/PCM Connector Terminals A25 And A26

Is there continuity?

YES - Repair short in the wire between the ECM/PCM terminals (A25, A26), then go to step 13.

NO - Go to step 21.

11. Turn the ignition switch OFF.

12. Replace the APP sensor (see THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT ).

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

14. Turn the ignition switch ON (II).

15. Reset the ECM/PCM with the HDS.

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

17. Turn the ignition switch OFF.

18. Turn the ignition switch ON.

2004 Acura TSX

2004 ENGINE PERFORMANCE Electronic Throttle Control System - TSX

19. Press the accelerator pedal to the floor.

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

Are any Temporary DTCs or DTCs indicated?

YES - If DTC P2138 is indicated, check for poor connections or loose terminals at the APP sensor 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 - Troubleshooting is complete.

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. Turn the ignition switch OFF.

23. Turn the ignition switch ON.

24. Press the accelerator pedal to the floor.

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

Are any Temporary DTCs or DTCs indicated?

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 P1683: THROTTLE VALVE DEFAULT POSITION SPRING 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. Turn the ignition switch OFF, and wait 10 seconds.

5. Turn the ignition switch ON (II).

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

Is DTC P1683 indicated?

CAUTION: Do not insert your fingers into the installed throttle body when you turn

the ignition switch ON (II) or while the ignition switch is ON (II). If you do,
there will be serious injury to your fingers if the throttle valve was
activated.

2004 Acura TSX

2004 ENGINE PERFORMANCE Electronic Throttle Control System - TSX

YES - Go to step 7.

NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the
throttle body and the throttle actuator control module.

7. Turn the ignition switch OFF.

8. Disconnect the intake air duct from the throttle body.

9. Push the throttle valve closed as shown.

Fig. 42: Pushing The Throttle Valve Closed

NOTE:

Do not operate the ignition switch during the check.

Be careful not to pinch your finger during the check.

2004 Acura TSX

2004 ENGINE PERFORMANCE Electronic Throttle Control System - TSX

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