35. Immobilizer Aerial
Troubleshooting procedure
Engine does not start
ENGINE DOES NOT START IF ONLY PULLED
Possible Cause Operation
Immobiliser enabling signal System not encoded
System not efficient, repair according to the indications of the
self-diagnosis
Presence of faults detected by the self diagnosis Pump relay
HV coil
Injector
Revolution timing sensor
Fuel system Fuel in the tank
Fuel pump activation
Fuel pressure (low)
Injector capacity (low)
Power to the spark plug Shielded spark plug cap HV coil (secondary insulation)
Parameter reliability Engine temperature
Distribution timing - injection ignition
Intake air temperature
End of compression pressure End of compression pressure
Starting difficulties
ENGINE STARTER PROBLEMS
Possible Cause
Operation
Presence of faults detected by the self diagnosis Pump relay
HV coil
Injector
Revolution timing sensor
Air temperature
Engine temperature
Start-up speed Starter motor and solenoid
Battery
Ground connections
End of compression pressure End of compression pressure
Power to the spark plug Spark plug
Shielded cap
HV coil
Speed-timing sensor
Ignition advance
Fuel system Fuel pressure (low)
Injector capacity (low)
Injector sealing (poor)
Correctness of the parameters Engine temperature
Stepper throttle valve position intake air temperature (steps
and actual opening)
Cleaning the throttle valve, air filter efficiency
Engine stops at idle
ENGINE DOES NOT IDLE/ IDLING IS UNSTABLE/ IDLING TOO LOW
Possible Cause
Operation
Presence of faults detected by the self diagnosis Pump relay
Vespa LX - S 125 3V ie 150 3V ie (2012) Injection
INJEC - 183
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