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DTC P1684: Throttle Valve Return Spring Performance Problem Acura TL IV facelift

Engine Control Systems 1 illustration ~391 words
CAUTIONDo not insert your fingers into the installed throttle body when you turn the ignition switch to ON (II)/press the engine start/stop button, or while the ignition switch is in ON (II)/vehicle in ON mode. If you do, you will seriously injure your fingers if the throttle valve is activated.

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 45

Scheme 45
Scheme 45
  1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3, 000 RPM without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
  4. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode, and wait 10 seconds.
  5. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  6. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1684 indicated? YES - Go to step 7. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the ECM/PCM.
  7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  8. Disconnect the intake air duct from the throttle body.
  9. Push the throttle valve open as shown in illustration below.
  10. Release the throttle valve. Does the throttle valve return? YES - Clean the throttle body (see «THROTTLE BODY CLEANING»(ref-512345-S27602551462012103100000) ), then go to step 12 and recheck. If DTC P1684 is indicated, go to step 11. NO - Go to step 11.
  11. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(ref-512345-S22857250882012103100000) ).
  12. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  13. Reset the ECM/PCM with the HDS.
  14. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(ref-512362-S04299387872012103100000) ).
  15. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode, and wait 10 seconds.
  16. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  17. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1684 indicated? YES - Check for poor connections or loose terminals at the throttle body and the ECM/PCM, then go to step 1 . NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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