Electronic Control Throttle Valve (Etv) System - Yamaha WaveRunner FX SHO Service Manual

GEN
INFO
Feature and benefit

Electronic control throttle valve (ETV) system

The flow chart shows a typical ETV system.
The ETV system consists of a throttle lever, a throttle cable, an accelerator position sensor, elec-
tronic control throttle bodies, and an electronic control module (ECM).
A throttle cable connects the throttle lever and the APS. The accelerator position sensor (APS)
detects the changes in operation of the throttle lever and changes the output voltage of the APS
accordingly. This voltage is then transmitted from the APS to the ECM. In accordance with the volt-
age input from the APS, the ECM operates the DC motor, which is installed on the ETV, and sets
the throttle valve to the opening angle that corresponds to the changes in operation of the throttle
lever.
At the same time, the throttle position sensor (TPS), which is located on the same axle, detects the
changes in the opening angle of the throttle valve and outputs the information to the ECM for opti-
mum operation.
1
ECM
1 Throttle body assembly
2 TPS
3 DC-motor
4 Throttle lever
5 Throttle cable
6 APS
2
3
1-18
E
4
5
6
1
2
3
4
5
6
7
8
9