ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION — Multiport Fuel Injection (MFI) System (Cont'd); Electronic Ignition (EI) System
EF & EC-7019prose procedureMultiport Fuel Injection (MFI) System (Cont'd)
CG10, CGA3
Fuel Injection Timing
Sequential Multiport Fuel Injection System
Fuel is injected into each cylinder during each engine cycle according to the firing order. This system is used when the engine is running.
Fuel Shut-off
Fuel to each cylinder is cut off during deceleration or operation of the engine at excessively high speeds.
Electronic Ignition (EI) System
DESCRIPTION — Input/Output Signal Chart
Electronic Ignition System Input/Output Signal Chart
Crankshaft position sensor (POS)
Input Signal to ECMEngine speed and piston position
ECM functionIgnition timing control
ActuatorPower transistor
Camshaft position sensor (PHASE)
Input Signal to ECMCylinder number
ECM function
Actuator
Mass air flow sensor
Input Signal to ECMAmount of intake air
ECM function
Actuator
Engine coolant temperature sensor
Input Signal to ECMEngine coolant temperature
ECM function
Actuator
Throttle position sensor
Input Signal to ECMThrottle position
ECM function
Actuator
Vehicle speed sensor
Input Signal to ECMVehicle speed
ECM function
Actuator
Ignition switch
Input Signal to ECMStart signal
ECM function
Actuator
PNP switch
Input Signal to ECMGear position
ECM function
Actuator
Battery
Input Signal to ECMBattery voltage
ECM function
Actuator
System Description
The ignition timing is controlled by the ECM to maintain the best air-fuel ratio for every running condition of the engine. The ignition timing data is stored in the ECM. This data forms the map shown above.
The ECM receives information such as the injection pulse width, crankshaft position sensor signal and camshaft position sensor signal. Computing this information, ignition signals are transmitted to the power transistor.