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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:

DTC “c21” (p0110-h/l): iat sensor circuit malfunction
Detected condition and possible cause Detected condition Possible cause C21 Output voltage is not with in the following range. 0.15 V ≤ Sensor voltage < 4.85 V Iat sensor circuit open or short.  Iat sensor malfunction.  Ec ...

Camshaft inspection
Refer to “engine top side disassembly” . Refer to “engine top side assembly” . Camshaft identification The exhaust camshaft has the embossed letters “ex” and the intake camshaft has the embossed letters “in”. Cam wear Check the camshaft for wear or damage. Measure the cam height “a” w ...

Spark plug inspection and cleaning
Inspect spark plug every 6 000 km (4 000 miles, 12 months) Heat range Remove the spark plugs. Refer to “ignition coil and spark plug removal and installation” in section 1h .  Check spark plug heat range by observing electrode color. If the electrode of the spark plug is wet appe ...

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