SsangYong Musso. Manual - part 1

SUPPLEMENT

to SERVICE

MANUAL

SECTION PAGE

MAITENANCE AND
REPAIR

1A-8

HUBER EGR

1A-3

PYUNGTAEK, KOREA

SSANGYONG MOTOR CO., LTD.

MUSSO SPORTS

REMOVAL AND
INSTALLATION

1A-17

1A-21

1A-28

COMPONENTS
LOCATOR

ELECTRICAL WIRING
DIAGRAM

1A-2  MUSSO-SPORTS

SUPPLEMENT

MUSSO-SPORTS  1A-3

SUPPLEMENT

HUBER EGR

SYSTEM DESCRIPTION

The following chart shows the relationship between the
input and the output in Huber EGR control unit.

Compared to traditional system that only operates the
EGR valve with RPM sensor and Micro switch, the Huber
EGR control unit bring big differences that of traditional
system on the functions.

Input Signal

RPM sensor (CPS)

EGR valve lift

 sensor

Throttle position sensor

(TPS) - M/T

Shift lever position

Throttle position sensor

(TPS)

Vehicle speed sensor

(VSS)

Basic input signal for EGR
operation

Engine cold or hot signal

Position signal of EGR
valve that is triggered by
vacuum modulator 1

Transfer the engine load signal
to the control unit directly
(manual transmission)

TCU (A/T)

EGR

Control

 Unit

Coolant temperature

sensor (CTS)

Solenoid valve (Control for

vacuum modulator 2)

If the control unit determines
it is in no-load sharp accel-
eration mode after analyzing
the input signals, this conver-
sion type switch reduces the
fuel consumption by cutting
off the intake air pressure from
fuel injection ALDA and gen-
erating the vacuum pressure.

In no-load sharp acceleration
mode, Duty Control  ( continu-
ous precise control) is acti-
vated according to the varia-
tions of the input signals when
the solenoid valve generates
the vacuum pressure in
ALDA.

Vacuum modulator 2

The opening value of the
modulator is precisely con-
trolled by input signals and
programmed MAP, and the
opening value of EGR valve is
also changed by the varia-
tions of vacuum pressure to
EGR valve.
The changed opening value is
transferred to the control unit
as input signal.

Vacuum modulator 1

TCU in automatic transmission equipped vehicle
transfers the information such as driving conditions
and speeds into the EGR control unit. EGR control
unit uses the shift lever position and vehicle speed
as important information for operating the solenoid
valve during no-load sharp acceleration mode.
In manual transmission, the signal of vehicle speed
is transferred into the EGR control unit directly.

Clutch switch

In manual transmission, the clutch switch is the one
of core elements to determine driving condition.

Output Signal

EGR Control Unit

1A-4  MUSSO-SPORTS

SUPPLEMENT

from vacuum pump

EGR valve

EGR control unit

KAA5A020

KAA5A020

KAA5A020

KAA5A020

EGR COMPONENTS

EGR Unit

1. Location: behind passenger's side panel

2. Arrangement: 81-pin connector

3. Integrated self-diagnostic function (Scan-100: not

fixed)

4. Part number

For automatic transmission: 28800-07100

For manual transmission: 28800-07000

Vacuum Modulator

1. Location: in front of intake manifold

2. Continuous precise control with the signals from EGR

unit (PWM-Pulse With Modulation Control)

3. Rated voltage: 12 V

4. Operating voltage: 8 ~ 16 V

5. Resistance (at 20 °C): 15.4 ± 0.7 

Ω

6. Operating range of vacuum (Duty control)

•••••

Vacuum modulator 1: 0 ~ 600 mbar

•••••

Vacuum modulator 2: 300 ~ 600 mbar

7. Modulator control

•••••

Vacuum modulator 1: for controlling EGR valve

•••••

Vacuum modulator 2: for controlling no-load sharp

acceleration (ALDA control)

not used
connector

Vacuum modulator 1

(for controlling EGR valve)

Vacuum modulator 2

(for controlling ALDA)

from vacuum pump

Vacuum modulator 1

Vacuum modulator 2

Solenoid valve

ALDA

Intake

manifold

EGR control unit