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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:

Diagnostic information and procedures
Engine lubrication symptom diagnosis Oil pressure check Check the engine oil pressure periodically. This will give a good indication of the condition of the moving parts. Note before checking the oil pressure, check the following.  Oil level (refer to engine oil and fi ...

Clutch lever position switch inspection
Inspect the clutch lever position switch in the following procedures:  disconnect the clutch lever position switch lead wires (1). Inspect the clutch lever position switch for continuity with the tester. If any abnormality is found, replace the switch with a new one. S ...

DTC c28 (p1655): secondary throttle valve actuator (stva) malfunction
Detected condition and possible cause Detected condition Possible cause The operation voltage does not reach the stva. Ecm does not receive communication signal from the stva. Stva can not operate properly or its motor locked Stva malfunction.   ...

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