Operation CHARM
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BMW
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1991
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318i Convertible (E30) L4-1796cc 1.8L DOHC (M42)
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Repair and Diagnosis
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Powertrain Management
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Ignition System
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Testing and Inspection
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Oscilloscope Patterns and Waveforms
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Test F - Reversed Polarity
Test F - Reversed Polarity
1.
If the the secondary pattern shows a reversed (negative polarity) pattern, check the areas indicated on the chart.
2.
If the pattern is not as indicated above, proceed to
FLOW OF DIAGNOSIS
and recheck diagnostic steps.