SsangYong Musso. Manual — part 38
IMMOBILIZER SYSTEM 9W-5
Diesel Version
The Immobilizer System consists of an electronic device with integrated coil, called ‘Active Antenna’, the crypto
transponder, which is integrated in the ignition key, and the Immobilizer-Control-Unit (ICU).
The Active Antenna is mounted at the ignition lock and handles the following tasks :
!
to supply the transponder with power
!
to receive the data from the ICU and transmit it to the transponder
!
to receive and demodulate the data from the transponder and transmit it to the ICU
The whole Immobilizer software, the authentication and the management of valid keys and controlling the fuel valve
is managed completely by the ICU.
!
Connector
- Immobilizer unit
- Solenoid valve
16
8
15
7
14
6
13
5
12
4
11
3
10
2
9
1
1
2
3
1 : Data out
3 : Data in
6 : Ground
7 : Data line
8 : K-Line
9 : IGN
1 : IGN (Brown)
2 : Code (Green)
3 : Ground (Black)
!
Wire circuit diagram
Antenna
3
4
2
1
Immo.
unit
7
8
Solenoid
valve
2
1
1
3
6
9
3
IGN
K-line (Diagnosis)
Solenoid Fuel Valve
Immobilizer System for Diesel Vehicles
9W-6 IMMOBILIZER SYSTEM
IMMOBILIZER SYSTEM 9W-7
System Integration
The med 98.2 immobilizer is an anti-theft protection device allowing the start of the engine only if a specific authorization
is obtained during the start up phase. The med 98.2 will allow (prohibit) the start of the engine by driving ON (OFF) an
internal solenoid valve.
The med 98.2 is a single unit integrating the following subsystem :
!
a valve that allows (valve open) or blocks (valve closed) the fuel flow through the engine fuel system
!
a microprocessor control system to control and activate the valve during the start up of the engine, in order to
allow the start up only when a specific permission is given
the med 98.2 task is, therefore, to prevent the non authorized start up of the engine.
The functional unit includes also a basic set of electronic components whose function is to reduce its dependence on
the microprocessor control system: a part from a short temporarily period, during the start up phase, the electronics
allows the control system to excite and open the valve, but it doesn’t allow to close it.
The valve can be shut off only after the KL 15 has been deactivated.
The structure allows to obtain the highest degree of safe-operation (functionality fail-start): a failure in the
microprocessor unit cannot cause the shut-off of the valve. The main consequence of this type of failure is to prevent
the next engine start up.
As a result of the above considerations, the med 98.2 immobilizer can realize its anti-theft functionality only in conjunction
with a control device: the ICU.
The ICU, when requested, sends a coded message to med 98.2 according to a settled communication protocol. The
med 98.2 will allow the start of the engine based upon this message.
In addition to the basic anti-theft functionality, the 98.2 immobilizer provides a number of diagnostic services when it
is connected to an external test instrument (SCAN-100). Those connections are depicted in the following integration
diagram (Fig. 1), where the dashed line indicates a temporary link for diagnostic purposes, and the shaded area the
med 98.2 system’s physical boundaries:
Fig. 1 - System Integration
Explanation of symbols:
med 98.2
Immobilizer
ICU
Immobilizer Control Unit
TESTER
Device that can be connected for diagnostic purposes
K-LINE
Serial line for communication with ICU
KL15
Ignition key (Power supply for med 98.2)
GND
Ground
9W-8 IMMOBILIZER SYSTEM
Defects
Possible cause
Remedy
No communication with
transponder
1. Defective wiring harness
-
Power supply/Open/short of ground
-
Open/short of signal terminal or
mis-conneting(between ECU
terminal No. 13 and 14)
1. Connect/replace the wire correctly.
2.1 Replace the transponder
2.2 Immobilizer programming
2. Damaged transponder
3. Replace the antenna
3. Defective antenna
4.1 Replace the ECU
4.2 Replace all transponder of the keys
4.3 Immobilizer programming
4. Defective ECU
No immobilizer
programming
(Components and
wiring harnesses are
normal but codes in
ECU and transponders
are not registered
normally)
1. Replace the transponders and ECU
with new
; Immobilizer programming is not
performed
1. Perform immobilizer programming
2. Replace transponders only(new)
; Immobilizer programming is not
performed
2. Perform immobilizer programming
3. Replace ECU only(new)
3.1 Replace the transponders with new
3.2 Perform immobilizer programming
4. Replace the transponder only
; Programmed for other ECU
4.1 Replace the transponders with new
4.2 Perform immobilizer programming
5. Re-programming is not performed
after clearing transponder code stored
in ECU that normally used system
5. Immobilizer programming
Notice
1. Application of ex-programmed transponder into other ECUs.
; In this case, it can not be removed for the settled “lock bit” in transponder even though you perform immobilizer
problem normally. Moreover it is impossible to start engine, so replace the transponder with new and perform
immobilizer programming.
DIAGNOSIS
GASOLINE ENGINE
Cause and Remedy for Defective When Diagnosed by Scanner
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