Emission Optimized

Emission Optimized - IGNITION KEY OFF

"Emission Optimized Ignition Key Off" is a programmed feature of the CAS Module. Offer the CAS Module detects KL15 is switched "off", the ignition coil relay (in the IVM) stays active (CAS voltage supply) 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 combusted as the engine runs down.

When KL15 is switched "off" the ECM removes the operating voltage from the fuel injection relay (in the IVM). The CAS Module will maintain power to the ignition coil relay for a few seconds to maintain ignition coil activation (by the ECM).