Chery A series. Manual - part 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