CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM
25
pin of ECU; No. 3 and No.4 pins connect with power
anode.
2)Installation position: on the engine
3)Purpose: Ignition coil transfers the low voltage of
primary winding to high voltage of secondary
winding, and produce spark by spark plug discharging
then burning the combustible gas inside of the
cylinder.
4)Working principle
Ignition coil ZS - K22 is made up of two primary
windings, two secondary windings, mandrel, and
casing. When one of the primary windings grounding
chunnel is connected, the primary winding is in
charging. Once the circuit is cut off by ECU, the
charging is stopped. At the same time the high voltage
is sensed in the secondary winding and making the
spark plug discharging. There is a different with the
distributor ignition coil: for the ignition coil ZS - K22,
there is one spark plug on both side of the secondary
winding, and the both spark plugs can ignite at the
same time. These two primaries connect and
disconnect to power alternatively. And
correspondently these two secondary windings
discharge alternatively.
5)Working voltage:14V
Working temperature:-40— 120★
6)Malfunction and diagnosis method
Malfunction: can not start.
Reason: current is too big and got burnt, damaged
by outside force etc..
Service notice: forbid to use "short circuit test
igniting method” to test ignition function,
prevents the electronic controller from damaging.
Simple measuring method: (disassemble the joint)
leave digital multimeter at ohm shift, connect two
meter pen to two pins of primary winding, the
resistance value is 0.42- 0.58Ωwhen it is 20★;
secondary winding resistance value is 11.2-
14.8kΩ.
Chart 3-18 E
xterior Drawing of Ignition
Coil
Connect To Main
Relay Pin No.87
Chart 3-19 circuit Diagram of Ignition
Coil
