INJECTION - IGNITION
9
9.1 – SYSTEM COMPONENTS
Electronic control unit
The ECU (1) is an electronic unit, digital type with microprocessor.
It controls the injectors and coils therefore adjusting the fuel injection and ignition, in according to
the engine operating conditions detected by sensors listed here below:
- absolute pressure sensor (measures the atmospheric pressure)
- air temperature sensor (measures intake air temperature)
- engine temperature sensor (measures coolant temperature)
- timing/rpm sensor (measures the engine rotation speed and cylinder timing relative to TDC)
- throttle position sensor (measure the throttle opening angle)
The ECU also monitors battery voltage so that it can adjust injector opening time and ignition coil
charging time accordingly.
The ECU determines the following values
- Amount of fuel delivered to each cylinder with a sequential non-parallel control
- Injector closing time and therefore injection timing relative to the end of the induction stroke
for each cylinder.
- Ignition advance
The adjustment of CO can be done by using the Walbro diagnosis kit.
CAUTION
In case the ECU has been replaced is necessary to make the operation “Reset of the throttle
position” (TPS).
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