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
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