Sym Citycom.300i, Service Manual

Page: 52 / 270

4. Fuel Injection System
4-6
Ignition System Outline
Principle
ECU determines the appropriate ignition timing by receiving the signals from the CPS, TPS, O
2
Sensor,
MAP Sensor, TA Sensor and TW Sensor in accordance with the engine RPM. The ignition coil produces
25000~30000 volts to fire the spark plug, maximizing the engine output, and improving the fuel
comsumption efficiency.
Specifications
1.
Ignition timing: 13 ‚ BTDC / 1650RPM
2.
Spark plug: NGK CR8E Clearance: 0.6 to 0.7 mm
3.
Crankshaft Position Sensor electric resistance: 80 ~ 160 Ω (Green / White - Blue / Yellow)
4.
Ignition coil primary circuit: 2.8 Ω „ 15% (20 ƒ C) (Red / Yellow - Black / Yellow)
5.
Battery Type: YTX12A-BS or GTX12A-BS Capacity: 12V 12Ah
ACG/ Flywheel Gear
(23+1 Long tooth)
CPS
Throttle position
Manifold absolute pressure
Engine coolant temperature
REG. REC.
Ignition coil
S
p
a
rk
p
lu
g
ECU
Oxygen content
Battery
Intake air temperature
Power relay
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