SsangYong Stavic / SsangYong Rodius (2005 year). Manual — part 142

DI08-5

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

ENGINE CONTROL SYSTEM

DI ENG SM - 2004.9

ENGINE CONTROL SYSTEM

ECU

According to input signals from various sensors, engine ECU calculates driver’s demand (position of the accelerator
pedal) and then controls overall operating performance of engine and vehicle on that time.

ECU receives signals from sensors through data line and then performs effective engine air-fuel ratio controls based on
those signals.

Engine speed is measured by crankshaft speed (position) sensor and camshaft speed (position) sensor determines
injection order and ECU detects driver’s pedal position (driver’s demand) through electrical signal that generated by
variable resistance changes in accelerator pedal sensor.

Air flow (hot film) sensor detects intake air volume and then transmits to ECU. Especially, the engine ECU controls the
air-fuel ratio by recognizing instant air volume changes through air flow sensor to pursue low emission gases (EGR valve
control). Furthermore, the ECU uses signals from coolant temperature and air temperature sensor, booster pressure
sensor and atmospheric pressure sensor as compensation signal to respond to injection start and pilot injection set
values and to various operations and variables.

DI08-6

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

ENGINE CONTROL SYSTEM

DI ENG SM - 2004.9

Pin No.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

Pin No.

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

Description

Engine ground

Engine ground

Main power (IG 1)

Main power (IG 1)

Main power (IG 1)

Rail pressure sensor power supply

ECU power hold relay

ABD signal

ACC 2 sensor ground

Auto cruise OFF

Auto cruise safety switch

A/C pressure signal

Fuel filter water detection warning lamp

Remote starter output

Glow plug control

Glow plug warning lamp

Rail pressure sensor signal

Rail pressure sensor ground

Engine ground

Auto cruise acceleration signal

ACC 2 sensor signal

K-LINE #1

K-LINE #2

Vehicle speed sensor signal input

IG 1

Clutch pedal switch

Description

Fuel filter water detection sensor

RPM signal output

Knock sensor signal (#2)

Knock sensor signal (#1)

Knock sensor ground (#1)

Auto cruise result signal

ACC 1 sensor ground

CAN- H1

ACC 2 sensor power supply

Brake lamp switch

Vehicle speed indication lamp

Preheater #1

Preheater #2

Knock sensor ground (#2)

HFM sensor (air temperature sensor)

Engine ground

Auto cruise deceleration signal

ACC 1 sensor signal

ACC 1 sensor power supply

CAN -LO

A/C cycling pressure switch

Brake pedal switch

Trip computer

DI08-7

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

ENGINE CONTROL SYSTEM

DI ENG SM - 2004.9

Pin No.

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

97

98

99

100

Pin No.

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

Description

A/C relay

Cooling fan LOW

Cooling fan HIGH

Crankshaft position sensor (-)

HFM sensor (air mass sensor)

HFM sensor (ground)

HFM sensor (power supply)

IMV (fuel pressure regulating valve)

Engine ground

Crankshaft position sensor (+)

Waste gate actuator

EGR valve

Booster pressure sensor signal

Booster pressure sensor ground

Description

Coolant temperature signal

Coolant temperature sensor ground

Camshaft position sensor signal

Camshaft position sensor ground

Engine check warning lamp

Blower switch

Booster pressure sensor power supply

Fuel temperature sensor signal

Fuel temperature sensor ground

Camshaft position sensor power supply

Immobilizer

Engine check warning lamp

Injector #1

Injector #4

Injector #3

Injector ground (#1, 3, 4)

Injector ground (#2, 5)

Injector #5

Injector #2

DI08-8

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

ENGINE CONTROL SYSTEM

DI ENG SM - 2004.9

ECU Inputs·Outputs

Control

E

C

U

Structure and Function of ECU

Function of ECU

ECU receives and analyzes signals from various sensors and then modifies those signals into permissible voltage levels
and analyzes to control respective actuators.

ECU microprocessor calculates injection period and injection timing proper for engine piston speed and crankshaft
angle based on input data and stored specific map to control the engine power and emission gas.

Output signal of the ECU microprocessor drives pressure control valve to control the rail pressure and activates
injector solenoid valve to control the fuel injection period and injection timing; so controls various actuators in
response to engine changes. Auxiliary function of ECU has adopted to reduce emission gas, improve fuel economy
and enhance safety, comforts and conveniences. For example, there are EGR, booster pressure control, autocruise
(export only) and immobilizer and adopted CAN communication to exchange data among electrical systems
(automatic T/M and brake system) in the vehicle fluently. And Scanner can be used to diagnose vehicle status and
defectives.

Operating temperature range of ECU is normally -40 ~ +85°C and protected from factors like oil, water and electromag-
netism and there should be no mechanical shocks.

To control the fuel volume precisely under repeated injections, high current should be applied instantly so there is
injector drive circuit in the ECU to generate necessary current during injector drive stages.

Current control circuit divides current applying time (injection time) into full-in-current-phase and hold-current-phase and
then the injectors should work very correctly under every working condition.

Output

Injector

EGR system

Fuel pressure regulating valve (IMV)

Electrical fan control (Low/High-speed)

A/C compressor relay

Glow plug relay

Immobilizer

Warning lights

(Water warning light, glow plug indica-

tor light, engine warning light)

Preheater (auxiliary heater)

K - line

CAN communication

Self-diagnosis

Inputs

Booster pressure sensor

Atmospheric pressure sensor
(Built-in ECU)

Air flow sensor (HFM)

Coolant temperature sensor

Fuel temperature sensor

Fuel pressure sensor

Fuel filter water sensor

Knock sensor

crankshaft position sensor

camshaft position sensor

Accelerator sensor

Vehicle speed sensor

Switch input signal

(IG, brake, clutch, A/C signal, A/C

compressor)