Freelander System Description and Operation
SECURITY
DESCRIPTION AND OPERATION 86-5-17
Programming – Vehicles From VIN 242164
The immobilisation ECU is programmed with vehicle specific data by Land Rover during vehicle manufacture. This
data is also stored in other ECU's on the vehicle. Non-sensitive data stored in the immobilisation ECU can be retrieved
using TestBook/T4.
The ECU is programmed during manufacture with data to support up to 30 keys which can be enabled with TestBook/
T4. Replacement or spare keys will be ordered and delivered to the dealer as a disabled key. The dealer will use the
previously described 'Learn Blank/New Keys' procedure for enabling the new key. The key will be supplied with the
correct key blade profile for the applicable vehicle lockset.
If a replacement immobilisation ECU is required it will be ordered and delivered to the dealer as a pre-programmed
ECU. The ECM and the new immobilisation ECU will however need have their rolling code synchronised using
TestBook/T4.
If the ECM is replaced, the new ECM will have to learn the identification code. This is achieved using TestBook/T4.
When the immobilisation ECU receives the correct diagnostic message it will transmit the identification code on a
continual basis until the ignition is switched to position 0 (off). Simultaneously, the ECM also receives a diagnostic
command to learn the new code.
Starter Motor Protection
The immobilisation system incorporates a starter motor protection function. When the engine speed exceeds a
predetermined value, a starter relay inside the immobilisation ECU is disabled. This relay is wired in series with the
main starter motor solenoid and therefore when disabled it cuts off the power supply to the starter motor. This prevents
damage to the starter motor being caused by a sticking ignition switch. The engine speed is derived from the
instrument pack which converts the speed from a CAN bus signal into a pulsed signal compatible with the
immobilisation ECU.
Diagnostics
A diagnostic socket allows the exchange of information between the immobilisation ECU and TestBook/T4. The
diagnostic socket is located in the driver's footwell and is constructed to ISO standard. A dedicated diagnostic bus is
connected between the socket and the immobilisation ECU. The bus allows the retrieval of diagnostic information and
programming of certain functions to be performed using TestBook/T4.
The diagnostic bus protocol differs depending on the immobilisation system fitted to the vehicle as follows:
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for vehicles up to VIN 242163 (EWS3-D system) the immobilisation ECU uses DS2 protocol
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for vehicles from VIN 242164 the immobilisation ECU uses Keyword 2000* protocol.
The immobilisation ECU monitors all inputs and outputs and if a fault is detected, a code for that fault is stored in a
fault log which can be retrieved using TestBook/T4. The diagnostic interface is also used for synchronising a
replacement ECM to the existing immobilisation ECU and for enabling or disabling new or current keys.