Chapter 1 Overview Section 4 Function Of EI Sensor
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Section 4 Function Of EI Sensor
★ECU (Engine Control Unit, EI Control Unit)ECU
ECU decide the fuel injection volume and ignition time to adjust the fuel injector opening and closingrate
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
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.
★ 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.
★MAP & IAT Sensor
（
Manifold absolute Pressure & Intake Air Temperature Sensor
）：
MAP 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 perceive the atmospheric temperature and is located the throttle body.
★TP Sensor (Throttle Position Sensor)
：
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.
★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 )
O2 sensor measure the oxygen volume from the exhaust gas and convert the oxygen volume into voltage
value, then communicate the output voltage to ECU.
★CKP Sensor
（
Crankshaft Position Sensor
）
CKP Sensor perceive the front and rear cylinder’s engine speed and realtime of piston position.
★CLT Sensor
（
Coolant temperature sensor
）
CLT Sensor measure the temperature of engine cylinder head, convert the temperature into resistance
value, and then transmit the resistance value to ECU.
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