DTC Troubleshooting: P1684 (40)

DTC P1684:  Throttle Valve Return Spring Performance Problem




Do not insert your fingers into installed throttle body when you turn the ignition switch ON (II) or while the ignition switch is ON (II). Otherwise, you will have serious injury to your fingers if the throttle valve was activated.



1.Turn the ignition switch ON (II).

2.Do the DTC CLEAR in the CLEAR MENU with the Honda PGM Tester or the HDS.

3.Start the engine. Hold the engine speed at 3,000 rpm (min-1) with no load (in Park or neutral) until the radiator fan comes on, then let it idle.

4.Turn the ignition switch OFF.

5.Turn the ignition switch ON (II).

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

Is DTC P1684 indicated?


YES - Go to 7.


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


7.Turn the ignition switch OFF.

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

9.Push the throttle valve to open side as shown.

NOTE:
  • Do not operate the ignition switch during check.
  • Be careful not to pinch a finger during check.

10.Release the throttle valve.

Does the throttle valve return?


YES - Do the throttle body cleaning, then go to 13.


NO - Go to 11.


11.Turn the ignition switch OFF.

12.Replace the throttle body.

13.Turn the ignition switch ON (II).

14.Do the ECM/PCM RESET in the CLEAR MENU with the Honda PGM Tester or the HDS.

15.Do the ECM/PCM idle learn procedure.

16.Start the engine. Hold the engine speed at 3,000 rpm (min-1) with no load (in Park or neutral) until the radiator fan comes on, then let it idle.

17.Turn the ignition switch OFF.

18.Turn the ignition switch ON (II).

19.Check for Temporary DTCs or DTCs in the DTCs MENU with the Honda PGM Tester or the HDS.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P1684 is indicated, check for poor connections or loose terminals at the throttle body and the throttle actuator control module, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.


NO - Troubleshooting is complete.n