Chery A11 2003 Repair Manual page 262

Maintenance Manual for Chery·Windcloud
10. Ignition Coil
Function: ignition coil transforms low
voltage of primary winding into high voltage
of secondary winding, spark is generated
through discharge of spark plug to ignite
fuel and air mixture in cylinder.
Composition and principle: ignition coil is
composed by primary winding, secondary
winding, slug and casing, etc. In case
voltage of accumulator is added onto
primary winding, the said winding is
charged; once ECU cuts off circuit of
primary winding, charging stops and at the
same time, high voltage is inducted on
secondary winding. Also, ECU controls
on/off condition of basal pole of ignition
coil amplifier via a wire so as to control
ignition.
Failure diagnosis: ECU can not function
failure diagnosis on ignition coil, so in case
any problem occurs in ignition coil, there is
no failure code, the only way is to check the
resistance of ignition coil to determine if the
said coil is in working order. Under normal
conditions, the thermal value of working
ignition coil is fairly big, however, excessive
temperature will lead to the increase of
resistance value of ignition coil, unsteady
performance and flameout of engine will
occur.
Primary winding resistance (A-B or C-B):
0.4ohm ±10% (23°±5°C)
Secondary winding resistance (Cylinder
1-4 or Cylinder 2-3):
4900ohm ±10% (23°±5°C)
Ignition coil
Main relay
Circuit diagram of ignition coil
Pins:
Primary winding of 1# coil connecting with
59# pin of ECU;
Primary winding of 2# coil connecting with
main relay;
Pin 3 connecting with Pin 66 of ECU.
High-voltage side:
Connect 1#, 2#, 3#, 4# pin respectively with
spark plug of corresponding
through sub live wire.
Troubleshooting: short circuit or open
circuit occurs inside coil;
Coil creepage, housing crack;
Coil aging leads to insufficient electric
quantity of ignition.
Marelli EFI System
High
voltage coil
cylinder
11