Maximum and Minimum Ignition Advance Control

If the actual ignition timing (basic ignition advance angle + corrective ignition advance or retard angle) becomes abnormal, the engine will be adversely affected. To prevent this, the ECM controls the actual advance so that the sum of the basic ignition and corrective angle cannot be greater or less than preprogrammed minimum or maximum values.

Approximately, these values are:

Advance angle = Basic ignition advance angle + Corrective ignition advance angle

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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