ECU
ELECTRONIC THROTTLE
BODY DC MOTOR
(ETB)
SPARK PLUGS
FUEL INJECTORS
MAIN RELA Y
TACHOMETER
O2 SENSOR
HEATER
FUEL PUMP
RELAY
BATTERY
VOLTAGE
PPU POSITION
ETB VALVE
APERTURE
INTAKE AIR TEMP
BOOST
PRESSURE
INTAKE MANIFOLD
PRESSURE
WASTEGATE
SOLENOID
ENGINE TEMP.
KNOCK SENSOR
CAM PHASE
SENSOR
ENGINE SPEED
SENSOR
O2 SENSOR
DIAGNOSTIC
CONNECTION
FUEL INJECTION / IGNITION / EXHAUST SYSTEMS
5.12004 Four Stroke PWC Service Manual
Bosch ME -- Motronic 7.4.4 Engine Management System
The Bosch engine management system implements the engine’ s operational status in--line with the operator’s
demands. The microprocessor responds to this demand by translating the throttle flipper travel into a specified
engine output.
The Engine Control Unit (ECU) is responsible for controlling and monitoring the density of each cylinders’ air
charges, the mass of injected fuel, and ignition timing.
In order to accomplish these tasks, the ECU relies on the following sensors and feedback systems:
Throttle Flipper Position (PPU)
Electronic Throttle Body Position (ETB)
Lambda Sensor (O2 Sensor)
Cam Phase Sensor
Engine Speed Sensor (Crankshaft Position Sensor)
Engine Coolant Sensor
Knock Sensor
Manifold Pressure Sensor
Boost Pressure / Air Temp. Sensor
Battery Voltage
The ECU has direct control over the following components:
Fuel Injectors
Ignition Coils
Electronic Wastegate Solenoid
Electronic Throttle Body DC Motor (ETB)
Fuel Pump and Main Relay
O2 Sensor Heating Element
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