Ignition System - TOHATSU MFS25 Service Manual

Fuel System (Fuel Injection)

5. Ignition System

For ignition system, pointless CD ignition system is adopted, and ECU's electronic ignition timing control system controls
the timing to the most suitable state according to current operating conditions.
As engine is cranked, electric current is generated in the alternator's exciter coil and ECU charge coil, which is input to
ECU's regulator to feed power needed for operations of ignition coil, fuel injector and fuel feed pump (FFP).
Spark Plugs
Fuel Tank
(1) Configuration of Ignition System
Ignition system consists mainly of the following components.
(1) Sensors and switches that transmit engine operating states to ECU.
(2) ECU that performs electronic control.
(3) Ignition coils and spark plugs that operate in accordance with control by ECU.
The following 6 components are included in the sensors and switches of (1).
• Pulser coil
• Throttle Position Sensor (TPS)
• Water Temperature Sensor
• MAP (Manifold Pressure) Sensor
• MAT (Manifold Temperature) Sensor
• Oil Pressure Switch
4-20
Fuel Regulator
Fuel Feed Pump
(FFP)
IG-COIL
Ignition Coil
Fuel Injector
MAT (Manifold Temperature)
Sensor
Throttle Position
Sensor
MAP ( Manifold Pressure ) Sensor
Water Temperature Sensor
Exciter Coils
Charge Coil
Pulser Coil #2
Crank position (Crank Position Sensor)
Open/close of thrittle
Temperature of cooling water
Vacuum pressure of intake air
Temperature of intake air
Reduction of hydraulic pressure
ECU
Controls fuel feed pump (FFP).
Drives injectors.
Drives ignition coils.
Regulator
Battery
Pulser Coil #1
Accessories
ECU Charge Coil
Rectifier
25/30 2006