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Suzuki GSX-R 1000 Service Manual: Throttle valve synchronization

Check and adjust the throttle valve synchronization among four cylinders.

  1.  Start the engine and run it in idling condition for warming up.
  2.  Stop the warmed-up engine.
  3.  Lift and support the fuel tank. Refer to fuel tank removal and installation in section 1g (page 1g- 9).
  4.  Remove the clamps (1).

Suzuki GSX-R. Throttle valve synchronization


  1. Disconnect the respective vacuum hoses (2) from vacuum nipples on the throttle body.
  2.  Disconnect the iap sensor coupler (3).

Suzuki GSX-R. Throttle valve synchronization


  1. Connect the respective vacuum tester hoses (4) to the vacuum nipples.

Suzuki GSX-R. Throttle valve synchronization


  1. Set up the sds tool. (Refer to the sds operation manual for further details.)
  2. Start the engine.
  3.  Click data monitor.
  4.  Warm up the engine (engine coolant temp. More than 80 c (176 f)).

Suzuki GSX-R. Throttle valve synchronization


  1. Click active control.
  2.  Click isc air volume control (5).

Suzuki GSX-R. Throttle valve synchronization


  1. Click on button (6) to fix the isc air volume of four cylinders.
Note

when making this synchronization, be sure that the engine coolant temperature is within 80 100 c (176 212 f).

Suzuki GSX-R. Throttle valve synchronization


  1. Engine speed: approx 1 150 rpm
  2. Isc valve position: approx 48 step
  1. Check for the synchronization of vacuum from #1 to #4 cylinders.

Suzuki GSX-R. Throttle valve synchronization


  1. Equalize the vacuum of the cylinders by turning each air screw (7) and keep it running at idling speed.
Note

always set the engine rpm at idle rpm.

Suzuki GSX-R. Throttle valve synchronization


  1. If the adjustment is not yet correct, remove each air screw and clean them with a spray-type carburetor cleaner and blow dry with a compressed air. Also, clean the air screw passageways.
Note

  •  slowly turn the air screw clockwise and count the number of turns until the screw is lightly seated.
  •  Make a note of how many turns were made so the screw can be reset correctly after cleaning.
  1. Repeat the procedures from 9) to 16).
  2.  Close the sds tool and turn the ignition switch off.
  3.  Disconnect the vacuum tester and reinstall the removed parts.
  4.  After completing the throttle valve synchronization, clear the dtc and reset the isc learned value using sds tool. Refer to isc valve preset and opening initialization in section 1c .
Isc valve visual inspection
Visually inspect the isc valve if necessary.  Inspect the isc valve for any carbon deposition defects. Clean or replace the isc valve if necessary. ...

Isc valve reset
When removing or replacing the throttle body assembly, reset the isc valve learned value in the following procedures:  turn the ignition switch on position. Set up the sds tools. (Refer t ...

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