82D-10
V1
MR-453-X79-82D000$040.mif
82D
UCH
Vdiag No.: 09
Engine immobiliser
The immobiliser function is divided between three coded computers (the UCH, the injection computer and the key).
Communication between the key and the UCH is ensured by the transponder ring through a magnetic field created
between the transponder ring and the key.
When the + After ignition is switched on, the key sends its identifier to the UCH via the transponder ring, located on
the ignition switch. The UCH runs through an authentication procedure with the key via the transponder ring. If the
key is allocated to the vehicle, then operation of the starter motor is authorised and the injection system is unlocked.
The injection computer has no reference code in its memory: the code which is transmitted is stored.
If the code supplied by the key is not recognised by the UCH, then the system remains locked. The red engine
immobiliser warning light flashes (quickly). The vehicle cannot be started.
Recognition of keys in normal operation
IMPORTANT
When the vehicle battery has a low charge, the drop in voltage caused by operating the starter could reactivate the
immobiliser. If the voltage is too low, the engine cannot be started, even by pushing the vehicle.
IMMOBILISER WARNING LIGHT
Vehicle protected (without After Ignition) Indicator light flashes at 1 Hz
Key recognised, injection protection lifted Warning light continuously illuminated for 3 seconds
and then goes out
Key not recognised, injection protected Warning light flashes at 4 Hz
ACCESS – SAFETY
Fault finding – Function
To Next Page
Loading...
