HYOSUNG Aquila GT250 Ej, Service Manual

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1-8-1 GENERAL INFORMATION
FUNCTION OF EI SENSOR
ECU (Engine Control Unit, EI Control Unit)
: ECU decide the fuel injection volume and ignition time to adjust the fuel injector opening and closing rate
which is considered the engine speed, intake air pressure, intake air volume, engine temperature, oxygen
volume and throttle opening angle, etc.
EI (Electric fuel Injector)
: EI spray the fuel to intake pipe by ECU’s injection signal.
Fuel which is needed combustion in the combustion chamber is supplied from the fuel tank.
ET sensor (Engine Temperature Sensor : ETS)
: ET sensor communicate the perceived engine temperature to ECU.
ET sensor is located the outside of the cylinder to measure the engine temperature.
GP switch (Gear Position Switch)
: GP switch is used when start / stop and control ECU as the converted electrical signal of the gear position is
supplied ECU.
IAP sensor (Intake Air Temperature : IAPS)
: IAP sensor measure the pressure which is generated from the intake pipe and compare with the provided
absolute pressure, then analogize the air volume indirectly and help to work the fuel injector properly.
IAT sensor (Intake Air Temperature Sensor : IATS)
: IAT sensor perceive the atmospheric temperature and is located the air cleaner case.
ISC solenoid (Idle Speed Control Solenoid)
: ISC solenoid is interlocked with the throttle body, so ECU control the engine idle speed.
O
2
sensor (Oxygen Sensor : O
2
S)
: O
2
sensor measure the oxygen volume from the exhaust gas and convert the oxygen volume into voltage
value, then communicate the output voltage to ECU.
Pick-up Coil
: Pick-up coil perceive the front and rear cylinder’s engine speed and realtime of piston position.
PV (Purge control Valve)
: Purge control valve is part of the evaporative emission control system. The purge control valve closes to
prevent the vapor from reaching the engine when it is turned off. When the engine is started and is ready to
receive the canister’s contents, the purge control valve opens to allow the vapor flow.
RO switch (Roll Over Switch)
: RO switch is the fuel cut-off system when the motorcycle is leaned over 60 for upset accident.
TP sensor (Throttle Position Sensor : TPS)
: TP sensor detect the throttle opening angle and is located the throttle body.
It decide the fuel injection volume and compensate the ignition time as inform idle acceleration
deceleration condition and throttle full opening etc. to ECU.