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Emission Optimized - Ignition Key Off

"Emission Optimized Ignition Key Off" is a programmed feature of the MS 43 control module.

After the ECM detects KL 15 being switched OFF, the ignition stays active for two more individual coil firings. This means that just two cylinders are fired - not two revolutions.

This feature allows residual fuel injected into the cylinders, as the ignition key is switched off, to be burned as the engine runs down.



Fig 1: Emission Optimized Ignition Key Off
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Fig 2: Emission Optimized Ignition Key Off Display
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