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.
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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 ...
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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.
...