Ignition circuit monitoring

The ignition circuit is monitored on the basis of the current in the primary coil of the ignition coil. When the engine is switched on, the current must stay within specific values during certain time thresholds. The ignition diagnosis monitors the:

• Primary circuit of the ignition coil
• Wiring harness for the ignition
• Secondary circuit of the ignition coil with spark plug
• Spark duration.

The following faults can be detected by the ignition circuit monitoring:

• Short circuit at the primary side of the ignition coil
• Short circuit on the secondary side of the ignition coil
• Spark plug
• Line disconnection of the activation
• Faulty ignition output stages.

The following cannot be detected:

• Sporadic faults such as loose contacts in the actuating wire
• Flashovers in the high voltage circuit parallel to the spark gap without the formation of an interterm fault.

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