Hyundai: Engine D4FA. Manual - part 40

DIESEL CONTROL SYSTEM

FLA -31

DIESEL CONTROL SYSTEM

DESCRIPTION

E28422F5

If the Diesel Engine Control system components (sensors,
ECM, injector, etc.) fail, interruption to the fuel supply or
failure to supply the proper amount of fuel for various en-
gine operating conditions will result. The following situa-
tions may be encountered.

Engine is hard to start or does not start at all.

Unstable idle.

Poor driveability

If any of the above conditions are noted, first perform a
routine diagnosis that includes basic engine checks (Ig-
nition system malfunction, incorrect engine adjustment,
etc.). Then, inspect the Diesel Engine Control system
components with the HI-SCAN (Pro).

NOTE

• Before removing or installing any part, read the

diagnostic trouble codes and then disconnect the
battery negative (-) terminal.

• Before disconnecting the cable from battery ter-

minal, turn the ignition switch to OFF. Removal
or connection of the battery cable during engine
operation or while the ignition switch is ON could
cause damage to the ECM.

• When checking the generator for the charging

state, do not disconnect the battery ’+’ terminal
to prevent the ECM from damage due to the volt-
age.

• When charging the battery with the external

charger, disconnect the vehicle side battery
terminals to prevent damage to the ECM.

MALFUNCTION INDICATOR LAMP (MIL)

[EOBD]

A malfunction indicator lamp illuminates to notify the driver
that there is a problem with the vehicle. However, the MIL
will go off automatically after 3 subsequent sequential driv-
ing cycles without the same malfunction. Immediately af-
ter the ignition switch is turned on (ON position - do not
start), the MIL will illuminate continuously to indicate that
the MIL operates normally.

Faults with the following items will illuminate the MIL.

• Mass Air Flow Sensor (MAFS)
• Vacuum Modulator for EGR

NOTE

Refer to "INSPECTION CHART FOR DIAGNOSTIC
TROUBLE CODES (DTC)" for more information.

EGNG103A

[NON-EOBD]

Faults with the following items will illuminate the MIL

• EGR
• EEEP ROM
• Injector
• Fuel pressure sensor
• Fuel pressure monitoring
• Variable Geometry Turbocharger(VGT)
• Accelerator Position Sensor (APS)
• Mass Air Flow Sensor (MAFS)
• Fuel pressure regulator

NOTE

Refer to "INSPECTION CHART FOR DIAGNOSTIC
TROUBLE CODES (DTC)" for more information.

EGNG103A

FLA -32

FUEL SYSTEM

[INSPECTION]

After turning ON the ignition key, ensure that the light
illuminates for about 5 seconds and then goes out.

If the light does not illuminate, check for an open cir-
cuit in the harness, a blown fuse or a blown bulb.

SELF-DIAGNOSIS

The ECM monitors the input/output signals (some signals
at all times and the others under specified conditions).
When the ECM detects an irregularity, it records the di-
agnostic trouble code, and outputs the signal to the Data

Link connector. The diagnosis results can be read with the
MIL or HI-SCAN (Pro). Diagnostic Trouble Codes (DTC)
will remain in the ECM as long as battery power is main-
tained. The diagnostic trouble codes will, however, be
erased when the battery terminal or ECM connector is dis-
connected, or by the HI-SCAN (Pro).

NOTE

If a sensor connector is disconnected with the ignition
switch turned on, the diagnostic trouble code (DTC)
is recorded. In this case, disconnect the battery neg-
ative terminal (-) for 15 seconds or more, and the di-
agnosis memory will be erased.

THE RELATION BETWEEN DTC AND DRIVING PATTERN IN EOBD SYSTEM

Driving
pattern

Driving
cycle

Malfunction

FLC
(Fault counter)

MIL

HLC
(Healing counter)

Warm up
cycle

Fault
memory

Freeze
frame

Ignition

off

LGGE150A

When the same malfunction is detected and main-
tained during two sequential driving cycles, the MIL
will automatically illuminate.

The MIL will go off automatically if no fault is detected
after 3 sequential driving cycles.

A Diagnostic Trouble Code(DTC) is recorded in ECM
memory when a malfunction is detected after two se-
quential driving cycles. The MIL will illuminate when
the malfunction is detected on the second driving cy-
cle.

A Diagnostic Trouble Code(DTC) will automatically
erase from ECM memory if the same malfunction is
not detected for 40 driving cycles.

DIESEL CONTROL SYSTEM

FLA -33

NOTE

• A "warm-up cycle" means sufficient vehicle oper-

ation such that the coolant temperature has risen
by at least 40 degrees Fahrenheit from engine
starting and reaches a minimum temperature of
160 degress Fahrenheit.

• A "driving cycle" consists of engine startup, ve-

hicle operation beyond the beginning of closed
loop operation.

FLA -34

FUEL SYSTEM

COMPONENTS LOCATION

EE4C6B6C

7,23

1,2

1. Mass Air Flow Sensor (MAFS)
2. Intake Air Temperature Sensor1 (IATS1)
3. Engine Coolant Temperature Sensor (ECTS)
4. Camshaft Position Sensor (CMPS)
5. Crankshaft Position Sensor (CKPS)
6. Rail Pressure Sensor (RPS)
7. Boost Pressure Sensor (BPS)
8. Accelerator Position Sensor (APS)
9. Vehicle Speed Sensor (VSS)
10. Injector
11. VGT solenoid valve
12. EGR Valve

13. Fuel Pressure Regulator Valve
14. Main Relay
15. ECM
16. DLC (Data Link Connector)
17. Multi-purpose Check Connector
18. Throttle Flap Actuator
19. Variable Swirl Valve Actuator
20. Rail Pressure Control Valve
21. Heated Oxygen Sensor (HO2S)
22. Fuel Temperature Sensor
23. Intake Air Temperature Sensor2 (IATS2)

SRS

AIR

SRS

AIRBAG

SRS

AIR

SRS

AIR

[LHD]

[RHD]

EGNG101A

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