Gilera 633721 Workshop Manual page 198

Injection
Possible Cause
Presence of faults detected by the self diagnosis
Fuel supply
Power to the spark plug
Parameter reliability
End of compression pressure
Starting difficulties
Possible Cause
Presence of faults detected by the self diagnosis
Start up engine speed
End of compression pressure
Power to the spark plug
Fuel supply
Correctness of the parameters
Engine stops at idle
ENGINE DOES NOT HOLD IDLING/ IDLING IS UNSTABLE/ IDLING TOO LOW
Possible Cause
Presence of faults detected by the self diagnosis
INJEC - 198
System not efficient, repair according to the indi-
Shielded spark-plug cap HV coil (secondary insulation)
ENGINE START-UP PROBLEMS
Stepper throttle valve position intake air tempera-
Cleaning of the auxiliary air pipe and throttle valve;
Nexus 500 euro 3
Operation
cations of the self-diagnosis
Pump relay
HV coil
Injector
revolution timing sensor
Fuel in the tank
Fuel pump activation
Fuel pressure (low)
Injector capacity (low)
Coolant temperature
Distribution timing - injection ignition
Intake air temperature
End of compression pressure
Operation
Pump relay
H.V. coil
Injector
revolution timing sensor
Air temperature
Coolant temperature.
Atmospheric pressure
Starter motor and remote control
Battery
Ground connections
End of compression pressure
Spark plug
Shielded cap
HV coil
Rpm-timing sensor
Ignition advance
Fuel pressure (low)
Injector capacity (low)
Injector seal (poor)
Coolant temperature
ture (steps and actual opening)
air filter efficiency
Operation
Pump relay
H.V. coil
Injector
revolution timing sensor