Chery A15. Manual — part 253

Two. System component engine control module
(ECM)
1. Functions and principles
The engine control module is one microprocessor
based on a singlechip. Its main function is to
process the data from all sensors located in
different parts of the vehicle and judge the
working status of the vehicle for the accurate
control of the engine through the actuator.
CPU parameters
16-digit main chip
16M clock frequency;
128K FLASH memory
8K RAM memorizer;
2K EEPROM memorizer;
Working parameters
- Working voltage range
- Normal working voltage range: 9.0V – 16V
- Overvoltage and reversed polarization protection:
+24V/-12V < 60s
- Location
ECM is located inside the engine room and on the
lower left part of the windscreen;
ECM casing and set bolts must be insulated from
the vehicle body.
- Temperature
- Storage temperature: -40 ～125℃
- Working temperature: -40 ～105℃
- Fittings

ECM wire harness fittings are 17+24+31 three-pin plugs.
3. Fault diagnosis
Tips: All the following judgments are based on the normal operation of the vehicle, wire
harness and other system components.
ECM faults:
System’s failure to communicate with the outside;
Signal input system fault: failure to receive sensor signals; generator adjustor fault and
over output voltage to damage the ECM; output control system fault; ECM internal drive
damage to disable the operation of the drive actuating mechanism.
4. ECM terminal definition

62

60

61

59

57

58

56

54

55

53

51

52

33

31

32

30

28

29

27

25

26

12

10

11

9

7

8

72

70

71

68

69

66

67

65

63

64

41

39

40

37

38

36

34

35

17

16

15

13

14

50

48

49

46

47

45

44

42

43

23

24

22

20

21

18

19

6

4

5

3

1

2

5. Computer plug description

1

High speed fan control

38

Vehicle speed sensor signal

2

Air conditioner relay control

39

Crank shaft position sensor

3

——

40

Water temperature sensor

4

——

41

Crank shaft position sensor

5

——

42

——

6

Grounding

43

——

7

Idle speed motor “D”

44

——

8

Low-speed fan control

45

Grounding

9

Fuel pump control

46

Ignition coil A

10

Canister solenoid valve

47

Troubleshooting data output

11

Turning speed “TN” output

48

Fault light control

12

——

49

Second cylinder fuel spray
nozzle

13

Idle speed motor “C”

50

Ignition coil B

14

Idle speed motor “B”

51

——

15

Idle speed motor “A”

52

——

16

——

53

——

17

——

54

——

18

IGN power source

55

Oxygen sensor grounding

19

——

56

Troubleshooting wire

Continued

20

Battery power source

57

Ignition coil A

21

Grounding

58

Battery power source

22

——

59

Water thermostat
signals

23

Knock sensor signal

60

Fourth cylinder fuel
spray nozzle

24

——

61

Third cylinder fuel
spray nozzle

25

MAP signal

62

Ignition coil B

26

Throttle position signal

63

——

27

MAP power source

64

——

28

MAP/MAT grounding

65

——

29

Grounding

66

——

30

Camshaft position sensor
“A”

67

Air conditioner high
and low-voltage switch

31

Front oxygen sensor signal

68

——

32

Rear oxygen sensor signal

69

——

33

Crank shaft position sensor

70

First cylinder spray
nozzle

34

Water temperature sensor
signal

71

Grounding

35

Air intake temperature
signal

72

Grounding

36

Throttle reference voltage

73

——

37

Sensor grounding

6. Computer control schematic diagram

Brown

Pink

Black/white

F

u

el

p

u

m

p

f

u

se

Front cabin fuse

Red/white

Water

temperature

sensor

Idle speed

relay

Charcoal canister

Red

Water
tank
high
speed
relay

Ho
wa
tank
lo
sp
fa
rel

C

o

m

p

re

ss

o

r r

ela

y

t

ter

w

eed

n

ay

Air
conditioner
high and
low-voltage
switch

Red/yellow

Knock

sensor

Crankshaft

sensor

Camshaft

sensor

Throttle

position

Mileage

Brown

Red green

Yellow

Red blue

Green red

Light green

Black

Black

White
green

Black

White

Orange

Red blue

Green blue

Brown
black

Grey

Green

White

Purple

Black/white

Green/white Brown/white

Meter vehicle speed

Orange

Yellow brown Green white

To meter RPM signal

Red /blue

Green

Pink

Green/red

Black

White
brown

Red
blue

Blue white

Grey red

Blue
purple Blue Yellow white Yellow

Brown

Brown
white

Brown
green

Yellow
green

Red
green

Brown Brown

Brown
purple

Brown
yellow

Brown
grey

Brown
green

Blue

Red blue

Yellow

Brown Brown

Brown

Yellow white

Pink

Red
yellow

Red
purple

Red
black

Red
grey

Green/red

Black/white

Brown

Yellow

Redwhite

To water thermostat

Red blue

Red blue Orange

Major oxygen sensor

Supporting oxygen sensor

1-4 ignition
coil

2-3 ignition
coil

Yellow red

Fault indicating lamp

Brownwhite

Fuel pump
relay

Injector

Diagnostic relay

White

Black/purple

Fuel pump

Brown

Brown