2.5.2 Description and Operation
2.5.2.1 Description and Operation

Engine  Anti-theft  system  feature  is  realized  by  the  engine
control module (IMMO) and the engine control module (ECM).
Engine anti-theft system components are listed below:

–

Anti-theft system Engine Control Module (IMMO)

–

Engine Control Module (ECM)

–

Body Control Module (BCM)

–

Electronic  Anti-theft  Coil  (Motor  Anti-theft  System,
Antennas)

–

Ignition Key (Transponder)

–

Engine Trouble Indicator Light (MIL)

1. Ignition Key (Transponder)

Inside  the  plastic  key  cover  of  the  ignition  key  there  is  a
transponder. The information contained in the transponder is
fixed and can not be changed. Vehicle anti-theft system uses
the engine ignition key transponder information to determine
whether the key used to start the vehicle ignition is valid. In
addition to the ignition key, it can open the door lock system
and also has a launch vehicle feature.

2. Electronic Anti-theft Coil (Engines Antenna
Anti-theft System)

The electronic Anti-theft ignition coil is installed in the cylinder.
When the ignition key is inserted into the ignition cylinder ON
position,  the  electronic  Anti-theft  ignition  coil  will  generate
electromagnetic  fields  to  stimulate  the  transponder  keys  to
send out a signal. Electronic anti-theft transponder coil detects
this signal and sends it to the engine control module anti-theft
system.

Integrated  on  the  electronic  anti-theft  coil  there  is  a  light-
emitting  diode  lighting  circuit  controlled  by  the  interior  light
circuit  in  order  to  facilitate  the  driver  to  locate  the  ignition
cylinder.

3. Engine Anti-theft System Control Module

The engine control module anti-theft system is installed in the
driver's side below the instrument platform, when it receives a
signal  from  the  electronic  anti-theft  transponder  coil.  The
engine control module anti-theft system compares this signal
with  key  information  in  the  memory  to  send  the  fuel  engine
control module enable / disable instruction.

Note

If  the  anti-theft  system  can  not  get  the  ignition  key
transponder information, it will not send any signal to the
engine control module.

4. Engine Control Module

Engine control module is installed under the passenger side of
instrument panel, near the air-conditioning blower. Based on
the signal received from the engine control module anti-theft
system, it sends instruction to enable / disable fuel injection.

Based  on  the  instruction  received  from  the  engine  control
module  anti-theft  system,  engine  control  module  will  decide
whether to send the engine control module to the body lock /
unlock status information.

Based  on  the  instruction  received  from  the  engine  control
module  anti-theft  system,  engine  control  module  will  decide
whether to send to the instrument cluster the "Light the engine
anti-theft system warning lamp" request.

5. Body Control Module

Body control module is installed in the driver's side instrument
panel left side bottom. it receives engine lock / unlock status
information from the engine control module.

If it receives the engine unlocked information, the starter will
get power and the vehicle will start.

If it receives the engine unlocked information, it will disconnect
the starter power supply, thus prohibiting the engine running.
At the same time body control module will activate the remote
control alarm system.

6. Engine Failure Warning Light (MIL)

When the instrument cluster receives a "Light the engine anti-
theft  system  warning  lamp"  request  from  the  engine  control
module,  it  will  enable  engine  malfunction  indicator  light
flashing, until the ignition is off.

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2.5.3 System Working Principle
2.5.3.1 System Working Principle

When the ignition key is inserted into the ignition cylinder and
ignition switch is at ON position, the transponder will be excited
by  electronic  Anti-theft  ignition  cylinder  coil.  the  transponder
will send a signal containing its own information. the signal is
received by the engine anti-theft system antenna and sent to
the  engine  control  module  Anti-theft  system.  Engine  control
module Anti-theft system compares this value with the value
stored in memory. If the ignition key is recognized as valid, the
engine anti-theft system control module will send the enable
fuel instruction to the engine control module through the serial
data  line;  if  the  transponder  information  is  not  correct,  the
engine anti-theft system control module will send the disable
fuel instruction to the engine control module.

Note

When the engine control module receives the instruction
to disable fuel, ECM will also send to the BCM disable
starter instruction through the CAN bus. So the starter
will also be locked to prevent the engine running; At the
same time, BCM will also activate alarm (if the remote
control anti-theft system is not in silent mode) and trigger
turning indicators start flashing.

Warning!

If use the invalid ignition key and if the ignition switch is
turned  too  fast,  before  the  anti-theft  engine  control
module sends instruction to disable the fuel, the starter
is still possible to run even start. At this point, it is likely
to cause injury to engine repair personnel.

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2.5.4 Component Locator
2.5.4.1 Component Locator

Electronic Anti-theft Coil, Engine Anti-theft System Control Module

1

2

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Legend

1. Engine Anti-theft System Control Module

2. Electronic Anti-theft Coil

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2.5.5 Disassemble View
2.5.5.1 Disassemble View

Repeater

2

1

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Legend

1. Remote Keyless Entry Transmitter

2. Transponder

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