VESPA 946 E4 EMEA 2021 Manual page 196

Injection
Engine does not start
Possible Cause
Immobilizer enabling signal
Faults detected by self-diagnosis
Fuel system
Power to spark plug
Parameter reliability
End of compression pressure
Starting difficulties
Possible Cause
Faults detected by self-diagnosis
Starter speed
End of compression pressure
Power to spark plug
Fuel system
Correctness of the parameters
Engine stops at idle
ENGINE DOES NOT IDLE/ IDLING IS UNSTABLE/ IDLING TOO LOW
Possible Cause
Faults detected by self-diagnosis
Ignition efficiency
INJEC - 196
Vespa 946 E4-E5 EMEA-USA-ASIA (2021-)
ENGINE DOES NOT START EVEN IF PULLED
ENGINE STARTER PROBLEMS
Operation
System not encoded
System not efficient, repair according to the indications of the
self-diagnosis
Pump relay
H.V. coil
Injector
Engine speed timing sensor
Fuel in the tank
Fuel pump activation
Fuel pressure (low)
Injector flow (low)
Shielded spark plug cap H.V. coil (secondary insulation)
Engine temperature
Distribution timing adjustment - injection start
Air temperature
End of compression pressure
Operation
Pump relay
H.V. coil
Injector
Engine speed timing sensor
Air temperature
Engine temperature
Starter motor and relay
Battery
Ground connections
End of compression pressure
Spark plug
Shielded cap
H.V. coil.
Engine speed timing sensor
Ignition advance
Fuel pressure (low)
Injector flow (low)
Injector sealing (poor)
Engine temperature
Intake air temperature Stepper throttle valve position (steps
and actual opening)
Cleaning of the auxiliary air pipe and throttle valve
Air filter efficiency
Operation
Pump relay
H.V. coil
Injector
Engine speed timing sensor
Air temperature
Engine temperature
Spark plug
Ignition timing