Chery A series. Manual — part 115

IGNITION SYSTEM

SUMMARY OF IGNITION SYSTEM

The ignition system is integrated with the fuel injection system. It is an electronic system
equipped with built-in power supply module. It can provide various kinds of optimum
ignition angular values. This task is being carried out through referencing of the input
instantaneous physical parameter related with the engine working conditions. With the help
of a circuit analyzing microprocessor, it is capable of writing in the various optimum ignition
values into the program.

Circuit of ignition system

1. Knock sensor 2. Ignition coil 3. Rotary sensor 4. Ignition switch
5. Relay 6. Ignition / Fuel injection ECU 7. Fuse

When ECU is breaking off the current of the primary coil, the resulted induction effect of the
secondary coil causes the voltage to rise (as high as 30,000V at idling speed), at this moment
the breakdown voltage of the compression stroke stage in the cylinder is very high
(>10,000V), and the breakdown voltage of the exhaust stroke stage in the cylinder is very low
(approx. 500V). The spark plugs in the 1-4 cylinders and 2-3 cylinders are directly connected
to the terminals of the secondary coils through high voltage cables.

Note: Take extreme care not to reverse the connection of high voltage cable during

reinstallation.

T-18

REMOVAL /INSTALLATION OF IGNITION COIL AND SPARK PLUGS:

1. Disconnect the wiring harness terminal post

from the negative grid of the battery．

2. Pull out the 4 connectors of high voltage cable

and ignition module plug.

3. Unscrew the three fastening screws for the

ignition module, and remove the ignition
module.

4. Pull out the high voltage cables, and uses a

special spark plug socket spanner to remove
the spark plugs. (Tightening torque: 10~14
Nm)

5. The installing steps are reverse to those for
removal.

Note:

Ensure that the spark plugs are restored to their

original positions during reinstallation. Any

incorrect installation will not only damage the

leading wires of the spark plugs and cause power

losses, but also cause adverse impact to the electronic

components.

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OVERHAUL IGNITION SYSTEM

----Disconnect the negative grid of the battery.

----Remove the spark plugs with a special tool, and check whether the spark plugs have been

ablated and there is any crack at the skirt section.

----Check whether the gap of spark plugs complies with the requirement.

Standard value: 1.1±0.5mm

----Check the spark plugs.

Note:

z Do not check, adjust or clean the gap of spark plugs with a metal brush. Otherwise, it

will damage the platinum igniter.

When spark plugs are cleaned with compressed gas, the cleaning process should be
completed within 20 seconds and the compressed gas value should not exceed 58.8kpa
(6.6kgf/cm

2

, 8.5psi). After completion of cleaning, make sure that no foreign materials

such as carbon or sand are left in spark plugs.

----Check whether there is any crack on the appearance of high voltage cables, and replace

the high voltage cable if the resistance is too high.

----Check whether the resistance of ignition coils complies with the specification.

Standard value: Primary coil resistance: 0.4Ω ±10%（at the temperature of 23±5°C）

Secondary coil resistance: 4900Ω±10%（at the temperature of 23±5°C）

If the resistance of ignition coils does not comply with the specification, please replace with
the original spare parts designated by Chery Automobile so as to prevent the improper
operation of the ignition system.

Inspection of ignition timing:

Note:

·The ignition timing must not be adjusted.

·Checking the ignition timing requires the usage of WDS or corresponding instrument.

1. Switch off all the electrical devices in the vehicle.

2. The procedures of preheating the engine are as follows:

(1) Start the engine

(2) Keep the rotation speed of the engine at about 3,000 R.P.M. until the cooling fan starts to
rotate.

(3) Release the fuel-accelerating pedal.

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(4) Wait until the cooling fan stops.

3. With the help of WDS or corresponding instrument, check whether the ignition timing falls

within the scope of the specification.

Ignition timing:

Approx.: 10

±5 degrees advancing TDC

4. When the engine speed is gradually increasing, confirm that the ignition timing is also

correspondingly advanced forward.

Check idling engine speed

Note:

·The ignition timing must not be adjusted.

·Checking the ignition timing requires the use of WDS or corresponding instrument.

1. Switch off all the electrical devices in the vehicle.

2. The procedures of preheating the engine are as follows:

（

1）Start the engine.

（

2）Keep the rotation speed of the engine at about 3,000 R.P.M. until the cooling fan starts to

rotate.

（

3）Release the fuel accelerating pedal.

3. With the help of WDS or corresponding instrument, check whether the ignition timing falls
within the scope of the specification.

Engine idle speed (480ED-1000010EA combined with electronics)

Conditions

Engine revolutions（RPM）

Non- load

800-900

Electrical devices in the vehicle start to work.

800-900

A/C is switched on, and cooling switch is switched off.

800-900

A/C is switched on, and cooling switch is switched on.

950-1050

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