Sym ATTILA RS-21 EFi 150 Service Manual page 74

¡ · As the fig 20 (2/8) shown, the menu provides with 3-set dynamic values of engine rpm,
atmosphere pressure & sensor's voltage, and throttle valve opening & sensor's voltage.
¡ · As the fig 21 (3/8) shown, the menu provides with 3-set dynamic values of engine rpm, CO
voltage meter, battery voltage, and sensor's voltage.
Fig 20
Description:
CO voltage meter: it is designed onto the ECU. This model does not has this function.
Battery voltage: it means that the ECU receives voltages from the terminals of power
supply, fuel injector, transistor ignition coil, and fuel pump.
Sensor voltage supply: it means that DC 5V supplied by the ECU and detected voltage.
(standard voltage value: 5V¡ Ó 0.5%)
¡ · As the fig 22 (4/8) shown, the menu provides with 4-set dynamic values of engine rpm,
injection timing, ignition timing, and ignition charging timing.
Description:
Injection timing: It means that the fuel injector opening times controlled by the ECU. i.e. the
fuel injection quantity.
ignition angle: It means that the ignition angle (timing) for the engine controlled by the ECU.
ignition charging timing: It means that the charging timing (ignition energy) set by the
ignition transistor.
This chapter Contents
4. FUEL INJECTION SYSTEM
Fig 22
Fig 21
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