Suzuki VLR1800, Service Manual

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1K-1 Exhaust System:
Engine
Exhaust System
Precautions
Precautions for Exhaust System
B822H11B00001
WARNING
!
To avoid the risk of being burned, do not touch the exhaust system when the system is hot. Any
service on the exhaust system should be performed when the system is cool.
CAUTION
!
Make sure that the exhaust pipes, muffler joint and muffler have enough clearance from the rubber
parts and plastic parts to avoid melting.
General Description
Exhaust Control System Description
B822H11B01001
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 muffler joint. EXCVA is mounted on
the main frame. The EXCV is operated by the EXCVA via the cables. This system is designed to improve the engine
torque at low engine rpm.
Exhaust Control System Operation
B822H11B01002
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 actuator motor. The position
sensor (incorporated in the EXCVA) detects the EXCVA movement by measuring the voltage and then the ECM
determines the EXCV opening angle based on the engine rpm, throttle opening angle and gear positions. Every time
the ignition switch is turned ON, the EXCVA automatically drives the EXCV and detects full close/open position
voltages and sets the EXCV to middle position.
1
2
I822H11B0001-01
1. Exhaust control valve actuator (EXCVA) 2. Exhaust control valve (EXCV)