111 Rev. 01/2015
10.1 Possible Faults
The MIC500 ignition controllers include several safety functions that can shut down the engine
in case of fault:
– Overspeed protection
– External shutdown contact (if digital input is set to function Switch Start/Stop)
– Misfire detection (primary)
– Shutdown in the case of a faulty pickup or a faulty pickup signal
– Faulty voltage supply
10.2 Causes of Faults
The ignition system consists of the following elements, which must be considered for
troubleshooting:
– Ignition controller
– Cable harness
– Ignition coils
– Ignition lead
– Ground leads
– Spark plugs
– Shut-down equipment
In most cases, the cause for ignition system breakdown lies outside the ignition controller. The
cause can be in one of the aforementioned components or it may be an error within the
connections.
10.2.1 Overspeed
The engine speed has exceeded the set overspeed value.
Potential causes:
– Speed controller does not function properly
– Fuel supply to engine is not optimal.
– Faulty pickup signal
10.2.2 Misfire Detection (Primary)
Misfiring due to an open circuit on the primary side was detected.
Potential causes:
– Defect in the output wiring
– Ignition coil defective
10 ERRORS
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