Simultaneous-Fault Diagnosis of Automotive Engine Ignition Systems Using Prior Domain Knowledge and Relevance Vector Machine

Table 2

Sample possible simultaneous faults of engine trouble reflected by ignition patterns.

Case number	Symptom or possible cause
1	High resistance in secondary circuit and misfire due to extremely lean mixture
2	Narrow spark-plug gap and carbon fouled in spark plug
3	Partially broken spark-plug cable and wide spark-plug gap
4	High resistance in secondary circuit cable and narrow spark-plug gap and rich mixture
5	Partially broken spark-plug cable and engine knock and wide spark-plug gap