Examination
1. Check that the wires are connected securely and that there is no corrosion.
2. Check the condition of the air filter and spark plugs.
3. Check the compression pressure in the engine cylinders.
4. Check ignition timing setting.
Adjustment
On Fenix and Bosch systems, regulation is not provided. If the idle speed or the composition of the mixture is not correct, then the control unit is damaged.
On the Magneti Marelli system, mixture setting and ignition timing can be adjusted. However, the adjustment can only be done by reprogramming the ECU using special diagnostic equipment.