PIAGGIO 500 cc, Service Manual

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Fuel injection
9 - 6
TROUBLESHOOTING
Suggestions for troubleshooting
1 Damage to the EMS system could derive most probably from the connections and not from the components.
Before carrying out a search on the EMS system, carry out the following controls:
1 Electrical feed
- Battery tension
- Burnt out fuse
- Electromagnetic switches
- Connectors
2 Frame earthed
3 Fuel supply
- Fuel pump broken
- Fuel filter dirty
4 Ignition system
- Spark plug faulty
- Coil broken
- Shielded cap broken
5 Air intake circuit
- Air filter dirty
- By-pass circuit dirty
- Stepper motor broken
6 Others
- Incorrect valve gear timing
- Idling carburation incorrect
- T.P.S reset sensor incorrect
2 Anomalies in the EMS system may derive from loose connectors. Ensure therefore that all connections are carried
out correctly.
Check the connectors, paying attention to the following points:
1 check that the terminals are not bent.
2 check that the connectors are properly engaged.
3 check that poor functioning is modified by provoking a slight vibration of the connector.
3 Before replacing the EMS control unit check the entire system accurately.
If the anomaly disappears by replacing the EMS control unit, install the original control unit again to see if the
anomaly returns.
4 For the fault search use a multimeter with an internal resistance of more than 10K/V.
Unsuitable instruments could damage the EMS control unit.
The recommended instruments are those with a definition superior to 0.1V and 0.5; precision must be superior
to ±2%.