Chery A series. Instruction - page 31
Installation: to be fixed by the support of bracket
under pilot trench of front windshield. Pay attention to
waterproofing.
Functions:
Multipoint sequential injection
Controlling ignition
Idle speed control
Independent knocking control on cylinder-by-cylinder
basis (knock sensor KS-1);
Providing sensors with power supply: 5V/100mA
Adopting cylinder-detecting signal (Phase sensor PG1)
λ
closed-loop control with self-adaptation
Controlling carbon canister control valve
Air conditioning switch
Engine-fault indicating lamp
Fuel quantitative correction
Engine speed signal output (TN signal)
Speed signal input
Failure self-diagnosis with flash code function
Accepting engine load signal
Troubleshooting: due to the fact that ECU (electric
control unit) has low failure rate, so generally it is not
advisable to replace ECU for troubleshooting on any
problem. Failure of components such as periphery
circuit and sensors shall be checked and solved firstly.
Do not replace ECU until all periphery components
are confirmed to be fault-free.
Description of pins of ECU:
Pin
Connection point
Type
Pin
Connection point
Type
1
Heated oxygen sensor
Output
42
A/C temperature sensor
Input
2
Ignition coil 2
Output
43
3
Ignition ground wire
Ground
44
Non-sustained power
supply
Input
4
45
Non-sustained power
supply
Input
5
Ignition coil 1
Output
46
Carbon canister Valve
Output
G-13
6
Fuel injector 4 (the 2
nd
cylinder)
Output
47
Fuel injector 3 (the 4
th
cylinder)
Output
7
Fuel injector 2 (the 3
rd
cylinder)
Output
48
8
Output of engine speed
signal
Output
49
9
50
Control of low speed fan Output
10
51
Electronic ground 2
Ground
11
52
12
Sustained power supply
Input
53
Electronic ground 1
Ground
13 Ignition
switch Input
54
14
The main relay
Output
55
15
Engine rotary sensor A
Input
56
16
Throttle position sensor
Input
57
A/C compressor switch
Input
17
Sensor ground 1
Ground
58
18
Oxygen sensor
Input
59
Speed signal
Input
19 Knock
sensor
A Input
60
20
Knock sensor B
Input
61
Power ground 1
Ground
22
63
Non-sustained power
supply
Input
23
64
Phase angle sensor D of
step motor
Output
24
65
Phase angle sensor A of
step motor
Output
25
66
Phase angle sensor B of
step motor
Output
26
67
Phase angle sensor C of
step motor
Output
27
Fuel injector 1 (1
cylinder)
Output
68
Control of high speed fan Output
28
69
Fuel pump relay
Output
29
Inspection light
Output
70
A/C compressor relay
Output
30
71
Diagnostic K wire
I/O
31
72
32
5V power supply 2
Output
73
33
5V power supply 1
Output
74
34
Engine rotary sensor B
Input
75
A/C switch
Input
35
Sensor ground 3
Ground
76
Blaster switch
Input
36
Sensor ground connector
2
Ground
77 Headlight
switch Input
37
Air intake pressure
sensor
Input 78
38
79
Phase angle sensor
Input
39
Temperature sensor of
engine coolant
Input 80
Power ground connector
2
Ground
40
Temperature sensor of
air intake
Input 81
41
G-14
※Electrical fuel pump
Function: Supply the fuel from the fuel tank to the
engine at required pressure and flow (vary from
individual system).
Structure and working principle: The electrical fuel
pump is comprised of direct current motor, vane pump
and end cover (integrated with non-return valve, release
valve and anti-electromagnetic interference elements).
The pump and the motor are mounted on the same shaft
and sealed in the same house. The pump and motor are
surrounded by the gasoline for cooling and lubrication.
The battery supplies power to the electrical fuel pump
through the fuel pump relay and the pump relay
switches on the circuit of the electrical fuel pump only
during start-up and operation of the engine. If the
engine stops running due to malfunction, the fuel pump
will stop operation automatically. The maximum
pressure at exit of the electrical fuel pump is
determined by the release valve within the range of
450-650 kPa. However the pressure of the whole fuel
system fluctuates along with fluctuation of the air
intake manifold pressure. The difference between the
system pressure and the air intake manifold pressure,
which normally is 350kPa, is determined by the fuel
pressure regulator.
Note: The temperature of fuel has a large impact on
performance of the fuel pump. When running under
high temperature for a long time, if the fuel temperature
is higher than a certain temperature, the pressure of the
fuel pump will be decreased rapidly. So please check
carefully whether the performance of the fuel pump
under high temperature is good if the engine fails to hot
start.
Pins: The electrical fuel pump has two pins connecting
to the fuel pump relay. Beside these 2 pins there are
marks of “+” and “-” on the shell of the fuel pump
respectively, which represent the positive and negative
grid.
The 70# pin of ECU controls the fuel pump relay.
Electrical fuel pump
Circuit diagram of the electrical fuel
G-15
Troubleshooting: The common malfunctions of the
fuel pump are representation of insufficient fuel
pressure, not pumping fuel and so on. It shall be
verified firstly in troubleshooting that the fuel pressure
is within rated range and the pipeline is leaked. In
addition both the positive and negative pressure of the
fuel tank will have impacts on the fuel system.
※Solenoid fuel injector
Function: The fuel injector supplies atomized fuel to
the engine through injecting the fuel within the required
time according to the demand from the ECU.
Structure and working principle: The ECU sends the
electrical pulse to the fuel injector coil for generate a
magnetic force. If the magnetic force is increased
enough to overcome the composite force of the release
spring pressure force, the gravity force of needle valve,
and the friction force, the needle valve will begin to
rise and the fuel injection will start. The maximum lift
range of the needle valve is no more than 0.1mm.
When the fuel injection pulse ends, the pressure force
of the release spring will make the needle valve close
again.
Notes on installation: Only the specific connector can
be used in the fixed fuel injector and shall not be
mixed.
For the convenience of installation it is recommended
that the upper O ring connected to the fuel distributor
pipe shall be coated with silica-free clean oil. Pay
attention not to make oil contaminate the inside of the
fuel injector and the injection hole.
Place the fuel injector in the fuel injector base in
vertical direction and fasten the injector on the base by
the clasp.
Note: As for the car not being used for a long time, it is
possible that such car can not start properly because the
coagulation of fuel in the fuel injector. Under such
circumstance verify carefully that the fuel injector is
coagulated.
Fault diagnosis: The electrical injection system of A15
RHD car can conduct fault diagnosis on the driving
stage of the fuel injector in stead of conducting fault
diagnosis on its self. If the driving stage of the fuel
injector is short or overloaded to the battery power
supply short to ground or open the malfunction flag
G-16
