Chery A series. Manual - part 32

supply, short to ground or open, the malfunction flag
bit is set. The closed loop control of the oxygen sensor
and its memory precontrol are disabled, but the last
data stored in its memory is valid. After the
malfunction is fixed, the malfunction flag bit will be
reset.

Working pressure: 350 kPa

Resistance of the fuel injector: 11-16

Ω

Pins： Each fuel injector has two pins. Of which the
one marked by “+” is connected to the 87# pin of
output terminal of the fuel pump relay; the other is
connected to the 27#, 6#, 7#, or 47# pin of the ECU
respectively.

Troubleshooting: The common malfunctions of the
fuel injector such as unsmooth fuel injection and
defective atomization are normally resulted due to long
term use of the engine. So the fuel injector shall be
cleaned periodically. The circuit short or open in the
internal coil of the fuel injector also will result
malfunction of the fuel injection system. Verify that the
system circuits are short or open.

※ Idle actuator with step motor DLA

Function: The idle actuator with step motor is also
equipped with a bypass air intake duct. If the throttle is
closed air can enter the engine through such bypass
duct. The ECU can adjust the sectional area of the
bypass duct through this step motor, control the air
intake flow and in turn control the quantity of fuel
injection based on the air flow. The increase or
decrease of the engine rotary speed can be achieved
through increasing or decreasing the sectional area of
the bypass duct under idle speed, through which the
closed loop control of engine rotary speed under idle
speed is achieved eventually.

Connected to the
87# pin of the
main relay

Circuit diagram of the solenoid fuel injector

Idle actuator with step motor

G-17

Structure and working principle: The step motor is a
micro-motor, which is comprised of steel stators
installed in a circle and a rotor. Each steel stator has a
coil. The rotor is permanent magnet and the center of
the magnet is a nut. All the coils of stators are always
on. If the current direction of any coil is changed, the
rotor will turn by an angle. If all coils of stators change
their currents directions in a proper order, a rotating
magnetic field will be generated and result in the
permanent magnet rotor rotating in designed direction.

Fault diagnosis: The ECU can detect the circuit short
and circuit open in the two coils of the idle step motor.
Upon the occurrence of such malfunction the engine
malfunction alarm light will be lit and the engine will
enter the malfunction operation mode.

Pins:

Pin A is connected to the 29# pin of ECU;
Pin B is connected to the 4# pin of ECU;
Pin C is connected to the 26# pin of ECU;
Pin D is connected to the 21# pin of ECU.

Troubleshooting: Verify that the four circuits between
the step motor and the ECU are short or open. Verify
that the step motor is jammed. Verify that there is
circuit short or circuit open inside the step motor.

※ Ignition coil ZSK-ROV

Function: The ignition coil transforms the low voltage
of the primary winding into the high voltage of the
secondary winding. The spark plug generates the spark
through discharging and ignites the combustion gas
mixed with air and fuel.

Structure and working principle: The ignition coil is
comprised of the primary winding, the secondary
winding, the iron core, the shell and so on. If the
battery voltage applies on the primary winding, the
primary winding is charged. After the ECU cut off the
circuit of the primary winding the charging will be
stopped and the high voltage will be inducted in the
secondary winding.

Fault diagnosis: Because the ECU is not able to
conduct diagnosing for the ignition coil, there is no
diagnostic trouble code for the malfunction of the
ignition coil. Whether the ignition coil functions
properly can be judged only by inspecting the ignition

i t

Th i iti

l t

Circuit of the stepper of the idle

The step motor
of the idle actuator

External appearance of

G-18

coil resistance. The ignition coil produces quite a lot
heat under normal operation and the over temperature
of ignition coil will result in such malfunctions as
increase of the ignition coil’s resistance, unstable
operation of the engine and engine stall.

Primary winding: 0.47 ohms

Secondary winding: 8 ohms

Pins:

1# pin of the primary winding is connected to the 5#
pin of ECU;
2# pin of the primary winding is connected to the 2#
pin of ECU;
3# and 4# pins are jointly connected to the positive grid
of power supply.

High voltage side: 1#, 2#, 3# and 4# pins are
connected respectively to the spark plug of the cylinder
with the same number through the distributor circuit.

Troubleshooting: Verify that there is circuit short or
circuit open in the coils.
Verify that there is electrical leakage and crack on the
shell.
Verify that the electricity for ignition is not sufficient
due to coil ageing.

※Carbon canister control valve

Function: It is used to control the purge airflow of the
carbon canister. The carbon canister control valve is
controlled by the ECU through the pulse length and
frequency (i.e. duty ratio) based on the engine load.
The excessive accumulation of fuel vapor in the carbon
canister will result in fuel spill and environment
pollution, so the function of the solenoid valve of the
carbon canister is to open the valve at an appropriate
time so that the excessive fuel vapor can enter the air
intake pipe and participate in the combustion.

Structure and working principle: The carbon canister
is comprised of magnetic coil, armature, valve and
other elements. There is a filter screen at its inlet. The
airflow passing the carbon canister control valve is not
only relative to the duty ratio of the pulse which is sent
by the ECU to the carbon canister control valve, but
also relative to the pressure difference between the exit
and inlet of the carbon canister control valve. If there is
no pulse, the carbon canister control valve is closed.

Ignition coil with double spark

87# main relay

Circuit diagram of the ignition coil

G-19

The ECU can indirectly control the purge airflow
through controlling the charging time of the carbon
canister solenoid valve based on the signals provided
by various sensors of the engine.

Fault diagnosis: The ECU doesn’t have the function of
self-diagnosis for the carbon canister control valve, but
has the function of self-diagnosis for the driving stage
of control valve of carbon canister. If the driving state
of the control valve of carbon canister is short or
overloaded to the battery voltage, short to ground or
open, the basic memory of the closed loop control of
fuel quantity will be closed, the memory of idling air
demand quantity will be closed and the memory data at
that time is valid. The common malfunctions of engine
are unstable idling or excessive high idle speed under
the malfunction of the solenoid valve of carbon
canister.

Pins:

1# pin is connected to the 87# pin on output terminal of
the main relay;
2# pin is connected to the 46# pin of ECU.

Troubleshooting: The blockage and crack of the
carbon canister will result in the increase of air intake.

※ Steel fuel distribution pipe assembly

Function: Store and distribute the fuel and provide a
relative stable pressure for the fuel injection system so
as to achieve the uniform fuel supply pressure and
quantity for each cylinder and stable operation of
engine.

Structure: The fuel distribution pipe assembly is
comprised of fuel distribution pipe (KVS-S) and fuel
injector (EV).

Installation requirement: The connection of fuel pipe
and rubber hose shall be fastened by clamp. The model
of the selected clamp shall match to the rubber hose to
ensure the seal connection between the fuel pipe and
the rubber hose.

Fault diagnosis: There is seldom possibility for the
malfunction occurrence in the main fuel supply pipe.
Most of the malfunctions, which result in the leakage of
the fuel system, are caused by poor assembly, so proper
note shall be paid during installation that any used
O-oil seal shall not be used again and appropriate
lubricant is allowed to be painted during assembly.

Carbon canister control valve

Circuit diagram of the solenoid valve
of the charcoal canister TEV-2

G-20

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