Hyundai: Engine D4FA. Manual - part 48

DIESEL CONTROL SYSTEM

FLA -63

SIGNAL WAVEFORM

Rail Pressure Sensor (RPS) is to provide to the ECM the
voltage signal corresponding to rail pressure.
The change in resistance is preportional to the rail pressure 
acting upon the diaphragm and rail pressure increases 
as load increases.

APS 1  signal

RPS  signal

EFNF550A

FLA -64

FUEL SYSTEM

BOOST PRESSURE SENSOR
(BPS)

BOOST PRESSURE SENSOR (BPS)

E3D1F62F

Boost pressure sensor (BPS) is installed on surge tank to
measure the absolute intake manifold pressure.
BPS input voltage is changed in proportion with absolute
pressure in manifold.
This information is used to control Variable Geometery Tur-
bocharger(VGT) by ECM.

AWJF300J

SPECIFICATION

Pressure (Kpa)

70

140

210

270

1.02 ~ 1.17

2.13 ~ 2.28

3.25 ~ 3.40

4.20 ~ 4.35

Output Voltage (V)

LGJF501E

CIRCUIT DIAGRAM

3

4

C101-1(23)

C101-1(53)

C101-1(13)

C101-1(40)

2

1

GROUND

5V supply

IATS1 Signal

BPS signal

BPS & IATS 2

P

C130

Harness side

1

2

3

4

EGNG114A

DIESEL CONTROL SYSTEM

FLA -65

SIGNAL WAVEFORM

Boost Pressure Sensor Signal

This illustration represents waveform of BPS when 
accelerating and decelerating.

EFNF553B

FLA -66

FUEL SYSTEM

INTAKE AIR TEMPERATURE
SENSOR (IATS)

INTAKE AIR TEMPERATURE SENSOR

(IATS)

EF90A524

Intake Air Temperature Sensor (IATS) is Negative Temper-
ature Charcteristics(NTC) thermistor which is installed into
both Mass Air Flow Sensor(MAFS) and Boost Pressure

Sensor(BPS), It senses intake air temperature which are
installed in front of turbocharger (inside of MAFS) and be-
hind it (inside of BPS).
Comparing air temperature from both sensors (one is in-
take air temperature, the other is air temperature passing
through turbo charger), more accurate sensing of intake
air temperature is possible.
ECM uses intake air temperature signal to performs EGR
control correction and fuel injection quantity correction.

BPS & IATS

MAFS & IATS

LGJF501G

SPECIFICATION

[IATS (INSTALLED INTO BPS)]

Temperature℃(℉)

Resistance(kΩ )

-20(-4)

13.89 ~ 16.03

-10(14)

8.50 ~ 9.71

0(32)

5.38 ~ 6.09

10(50)

3.48 ~ 3.90

20(68)

2.31 ~ 2.57

30(86)

1.56 ~ 1.74

40(104)

1.08 ~ 1.21

50(122)

0.76 ~ 0.85

60(140)

0.54 ~ 0.62

70(158)

0.40 ~ 0.45

80(176)

0.29 ~ 0.34

90(194)

0.22 ~ 0.26

100(212)

0.17 ~ 0.20

110(230)

0.13 ~ 0.15

120(248)

0.10 ~ 0.12

130(266)

0.08 ~ 0.10