DTC Troubleshooting: P1684
DTC P1684: Throttle Valve Return Spring Performance Problem
Do not insert your fingers into the installed throttle body when you turn the vehicle to the ON mode, or while the vehicle is in ON mode. If you do, you will seriously injure your fingers if the throttle valve is activated.

NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P1684 Throttle Valve Return Spring Performance Problem
    

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Start the engine.

?4.
Hold the engine speed at 3,000 rpm without load (in neutral) until the radiator fan comes on, then let it idle.

?5.
Turn the vehicle to the OFF (LOCK) mode, and wait 10 seconds.

?6.
Turn the vehicle to the ON mode.

?7.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
P1684 Throttle Valve Return Spring Performance Problem
    

Is DTC P1684 indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot.?
2.
Throttle body condition check:

Throttle body condition check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the throttle body inlet pipe and the throttle body connector tube from the throttle body.

?3.
Push the throttle valve open as shown.


?4.
Release the throttle valve.

Does the throttle valve return?

     
YES
     
     
     
Clean the throttle body. If DTC P1684 is indicated again, replace the throttle body.?
     
NO