Page 263 - Foton Workshop Manual - Aumark (BJ1099)

ENGINE CONTROL SYSTEM - IGNITION COIL 11-37
IGNITION COIL

1. Principle of Work
Ignition coil is mainly comprised of primary coil, secondary coil, iron core，etc.. The
ignition system turns the low-voltage electricity into the high-voltage electricity by
means of ignition coil, making the spark plug generate electric spark. Each ignition
coil is only for one cylinder. Under the control of computer ECM in automobile,
charge the primary coil to accelerate magnetic energy. The secondary coil winding
will induce high-voltage electricity, making the spark plug connected to the coil 11
flash over. And meanwhile, make ignition coil of every cylinder output high-voltage
electricity to spark plug under the orderly control.
2. Function and installation
Ignition coil is installed on the engine hood in the form of single cylinder igniting
independently. After receiving the ignition signal of ECU, ignite the high-temperature
and high-pressure gas mixture through the high-voltage spark generated by spark
plug in each cylinder according to the correct timing sequence of ignition, to ensure
the normal operation of engine.
3. Fault phenomenon and judgment method
(a). Fault phenomenon: the engine shakes or fails to start, etc..
(b). General causes for faults:
It is burned as a result of overcurrent, or damaged by outside force, etc..
(c). Precautions for maintenance:
n the process of maintenance, the ignition function is not allowed to be tested by
means of "short circuit test", to avoid damaging the components of electrical
equipment.

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