Engine Knocking; Decoder Master-Box Circuit; Constant Supply Circuit Check; Presence Of Knocking (Overhead Knocking) - Gilera Nexus 500 Workshop Manual

Nexus 500

Engine knocking

PRESENCE OF KNOCKING (OVERHEAD KNOCKING)

Possible Cause
Presence of faults detected by the self diagnosis
Ignition efficiency
Parameter reliability
Intake system seal
TPS reset successful
Fuel supply
Selection of the cylinder base gasket thickness

Decoder master-box circuit

This section describes the operations to be carried out to check the power supply circuit.

Constant supply circuit check

The decoder basic power supply is necessary for the deterrent flashing management. The injection
control unit power supply is necessary for the Stepper motor management.
A power supply failure disables both ignition and injection.
In case of power supply faults, the diagnostic tester gives the information "NO REPLY FROM THE
CONTROL UNIT".
To carry out the check, proceed as follows:
Specific tooling
020460Y Scooter diagnosis and tester
Operation
Pump relay
H.V. coil
Injector
revolution timing sensor
Air temperature
Coolant temperature.
Atmospheric pressure
Spark plug
Throttle valve position signal
Coolant temperature indicator
Intake air temperature indicator
Ignition advance
Intake sleeve
Filter box
TPS reset successful
Fuel pressure
Fuel filter
Injector capacity
Fuel quality
Selection of the cylinder base gasket thickness
Injection
INJEC - 203