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Suzuki GSX-R 1000 Service Manual: Exhaust control system description

The exhaust control system (excs) consists of the exhaust control valve (excv), exhaust control valve actuator (excva) and exhaust control valve cables (excv cables).

Excv is installed in the exhaust pipe. Excva is mounted inside of the right frame. The excv is operated by the excva via the cables. This system is designed to improve the engine torque at low engine rpm.

Suzuki GSX-R. Exhaust control system description


  1. Exhaust control valve actuator (excva)
  2. Exhaust control valve (excv)
General description
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Exhaust control system operation
The excs is operated by the signal supplied from the ecm. The open/close operation of the excv is performed by the excva which is controlled by the ecm by changing the current direction of the ac ...

Other materials:

Cooling fan relay inspection
Inspect the fan relay in the following procedures:  remove the frame covers. Refer to “exterior parts removal and installation” in section 9d (page 9d- 6).  Remove the cooling fan relay (1). First check the insulation between “a” and “b” terminals with tester. Then ap ...

Swingarm bearing removal and installation
Removal Remove the swingarm. Refer to “swingarm removal and installation” .  Remove the swingarm pivot bearings (1) using the special tool. Special tool (a): 09921–20240 (bearing remover set) Remove the center spacer (2). Remove the cushion lever bearing (3) usin ...

Open circuit check
Possible causes for the open circuit are as follows. As the cause can exist in the connector/coupler or terminal, they need to be checked carefully.  Loose connection of connector/coupler.  Poor contact of terminal (due to dirt, corrosion or rust, poor contact tension, entry of f ...

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