Hyundai: Engine D4FA. Manual - part 49

DIESEL CONTROL SYSTEM

FLA -67

[IATS (INSTALLED INTO MAFS)]

Temperature℃(℉)

Resistance(kΩ )

-20

12.66 ~ 15.12

0

5.2 ~ 5.9

20

2.29 ~ 2.55

80

0.31 ~ 0.37

CIRCUIT DIAGRAM

C103

MAFS & IATS 1

ECM

MAFS Ground

IATS 2 Signal

MAFS Signal

MAFS current pumping

2

3

C101-1 (44)

C101-2 (89)

C101-1 (42)

C101-1 (37)

Battery (+)

5

1

4

1

2

3

4

5

EGNG112A

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

FLA -68

FUEL SYSTEM

SIGNAL WAVEFORM

IATS signal should be smooth and continuous without any
sudden changes.
After warmed-up, the IATS signal should not change 
significantly while ECTS signal drops.

LGJF501H

COMPONENT INSPECTION

[IATS 1]

1.

Turn the ignition key off.

2.

Disconnect Boost Pressure Sensor connector.

3.

Measure resistance between the terminals 3 and 4 of
MAFS connector.

<Sensor side>

5

4

3

2

1

LGJF501J

4.

Refering to "SPECIFICATION", check that the resis-
tance is within specification.

[IATS 2]

1.

Turn the ignition key off.

2.

Disconnect Boost Pressure Sensor connector.

3.

Measure resistance between the terminals 3 and 2 of
BPS connector.

<Sensor Connector>

4

3

2

1

LGJF501I

4.

Refering to "SPECIFICATION", check that the resis-
tance is within specification.

DIESEL CONTROL SYSTEM

FLA -69

ACCELERATOR POSITION
SENSOR (APS)

ACCELERATOR POSITION SENSOR

(APS)

ECAEFC93

On electronic injection systems, there is no longer a load
lever that mechanically controls the fuelling. The flow is
caculated by the ECM depending on a number of param-
eters, including pedal position, which is measured using
a potentiometer. The pedal sensor has two potentiome-
ters whoses slides are mechanically solid. The two po-
tentiometers are supplied from distinct and different power
sources so there is built in redundancy of information giv-
ing reliable driver’s request information. A voltage is gen-
erated across the potentiometer in the acceleration posi-
tion sensor as a function of the accelerator-pedal setting.
Using a peogrammed characteristic curve, the pedal’s po-
sition is then calculated from this voltage.

APS

AWJF300K

SPECIFICATION

Output Voltage (V)

Test Condition

APS1

APS2

Idle

0.14 ~ 0.16

0.073 ~ 0.077

Fully depressed

0.76 ~ 0.88

0.35 ~ 0.47

CIRCUIT DIAGRAM

APS

ECM

6

2

5

3

1

4

C101-2(45)

C101-2(9)

C101-2(30)

C101-2(46)

C101-2(31)

C101-2(8)

APS1

APS2

E107

Harness side

APS1 Supply

APS1 Signal

APS1 Ground

APS2 Supply

APS2 Signal

APS2 Ground

1

2

3

4

5

6

EGNG115A

FLA -70

FUEL SYSTEM

SIGNAL WAVEFORM

APS1 Signal

APS2 Signal

APS2 is a half of APS1 signal.

LGJF501L

COMPONENT INSPECTION

1.

Disconnect APS connector and connect the voltimeter
to the terminals 2 and 5 of APS connector.

2.

Supply the terminal 6 with DC 5V.

<Sensor side>

5V

1

2

3

4

5

6

V

AWJF301S

3.

Check the voltage between the terminals 2 and 5 on
operating pedal.

Idle: 0.14 ~ 0.16V
Fully depressed: 0.76 ~ 0.88V

4.

Disconnect the voltimeter and DC 5V.

5.

Connect the voltimeter to the terminals 1 and 4 of APS
connecotr.

6.

Supply the terminal 3 with DC 5V.

<Sensor side>

5V

1

2

3

4

5

6

V

AWJF301T

7.

Check the voltage between the terminal 1 and 4 on
operating pedal.

Idle 0.073 ~ 0.077V
Fully depressed: 0.35 ~ 0.47V