Mitsubishi L200. Manual — part 665
IMMOBILIZER SYSTEM
CHASSIS ELECTRICAL
54A-27
IMMOBILIZER SYSTEM
GENERAL INFORMATION
M1541107100076
The engine immobilizer system prevents the engine
from starting and immobilizes the vehicle if a key
other than the key registered for that vehicle is used
in an attempt to start the engine after forced entry.
The engine immobilizer system consists of the igni-
tion key, key ring antenna, ETACS-ECU (immobi-
lizer-ECU) and the engine-ECU. It works in the
following way and has these functions.
1. With the ignition key turned ON, the transponder
(a small transmitter) integrated in the ignition key
transmits its own key ID to the key ring antenna
via radio wave.
2. According to the sent key ID, the ETACS-ECU
(immobilizer-ECU) controls the engine-ECU only
when the sent key ID agrees with the pre-regis-
tered one.
3. The system is designed to be maintenance-free
because the power source for the transponder is
supplied by the ETACS-ECU (immobilizer-ECU).
Two ignition keys are provided, and up to eight
keys can be registered to one vehicle as needed.
More than one trillion of key ID combinations can
be registered, and parts of them are irregularly
changed whenever the ignition key is turned ON.
This feature prevents code copying, resulting in
higher security of the system.
CONSTRUCTION DIAGRAM
MAIN COMPONENTS
AC406526
AQ
CPU
CPU
Ignition key
CAN
Key ID
Transponder
Steering lock
Injector
Key ring antenna
ETACS-ECU
(Immobilizer-ECU)
Engine-ECU
Ignition
Component name
Outline of function
Transponder
Is power-supplied by the key ring antenna. When the transponder receives
random number data, the transponder processes random number data and the
key ID. Then it transmits the process result to the ETACS-ECU (immobilizer-
ECU).
Key ring antenna
The ETACS-ECU (immobilizer-ECU) supplies power via an antenna on a
steering lock by transmission of electromagnetic waves to a transponder built
into a key, using magnetic coupling
ETACS-ECU (immobilizer-
ECU)
• Supplies electrical power to the transponder integrated in the ignition key,
and transmits random number data.
• Verifies the key ID which is sent from the transponder. If the code is correct,
it sends an engine mobilization signal to the engine-ECU.
Engine-ECU
Starts the engine, and then continues the engine running if an engine
mobilization signal is confirmed. If an engine immobilization signal is
confirmed, the ECU cancels the engine control and stops the engine.
IMMOBILIZER SYSTEM
CHASSIS ELECTRICAL
54A-28
SPECIAL TOOLS
M1541106600090
IMMOBILIZER SYSTEM
CHASSIS ELECTRICAL
54A-29
Tool
Number
Name
Use
MB991955
a. MB991824
b. MB991827
c. MB991910
d. MB991911
e. MB991825
f. MB991826
M.U.T.-III sub-
assembly
a. Vehicle
Communication
Interface (V.C.I.)
b. M.U.T.-III USB
cable
c. M.U.T.-III main
harness A
(Vehicles with
CAN
communication
system)
d. M.U.T.-III main
harness B
(Vehicles without
CAN
communication
system)
e. M.U.T.-III
measure adapter
f. M.U.T.-III trigger
harness
CAUTION
For vehicles with CAN
communication, use M.U.T.-
III main harness A to send
simulated vehicle speed. If
you connect M.U.T.-III main
harness B instead, the CAN
communication does not
function correctly.
Diagnosis code check
MB991223
a. MB991219
b. MB991220
c. MB991221
d. MB991222
Harness set
a. Check harness
b. LED harness
c. LED harness
adapter
d. Probe
Continuity check and voltage
measurement at harness wire
or connector
a. For checking connector pin
contact pressure
b. For checking power supply
circuit
c. For checking power supply
circuit
d. For connecting a locally
sourced tester
MB991910
MB991826
MB991955
MB991911
MB991824
MB991827
MB991825
a
b
c
d
e
f
DO NOT USE
MB991223
a
d
c
b
DO NOT USE
BA
IMMOBILIZER SYSTEM
CHASSIS ELECTRICAL
54A-30
TROUBLESHOOTING
DIAGNOSIS TROUBLESHOOTING FLOW
M1541106700020
Refer to GROUP 00
− Contents of Troubleshooting .
DIAGNOSTIC FUNCTION
M1541100500170
HOW TO READ DIAGNOSIS CODE
Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points .
HOW TO ERASE DIAGNOSIS CODE
Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points .
CHECK OF FREEZE FRAME DATA
The freeze frame data can be checked by using
M.U.T.-III. (Refer to GROUP 00
− How to Use Trou-
bleshooting and Inspection Service Points
− Diagno-
sis Function .
When detecting fault and storing the diagnosis code,
the ECU connected to CAN bus line obtains the data
before the determination of the diagnosis code and
the data when the diagnosis code is determined, and
then stores the ECU status of that time. By analysing
each data from M.U.T.-III, the troubleshooting can be
performed more efficiently. The displayed items are
as the table below.
Display item list
CHART CLASSIFIED BY DIAGNOSIS
CODES
M1541100400173
CAUTION
During diagnosis, a diagnosis code associated
with other system may be set when the ignition
switch is turned on with connector(s) discon-
nected. On completion, confirm all systems for
diagnosis code(s). If diagnosis code(s) are set,
erase them all.
MB992006
Extra fine probe
Continuity check and voltage
measurement at harness wire
or connector
Tool
Number
Name
Use
MB992006
Item No.
Item name
Data item
Unit
2
Ignition cycle
Number of times the ignition switch is turned
"ON" or "LOCK (OFF)" after the past failure
transition.
Number of
counts is
displayed.
3
Elapsed time
Total elapsed time after a diagnosis code is
generated
min
4
Accumulated minute
Cumulative time for current malfunction of
diagnosis code
min
Code No.
Diagnosis contents
Reference page
B1702
Reception error of key ID
B1703
Key ID inconsistent
B1722
Transponder antenna failure
B1731
Communication error with the engine-ECU
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