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Home >> Saturn >> 2000 >> LW1 L4-2.2L VIN F >> Repair and Diagnosis >> Powertrain Management >> Relays and Modules - Powertrain Management >> Relays and Modules - Computers and Control Systems >> Engine Control Module >> Description and Operation >> Powertrain Control Module >> Spark Timing Control
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Spark Timing Control

The PCM receives 7X REF signal from crankshaft position sensor. The PCM also uses MAP and TP to calculate spark output signal. The spark output signal controls timing of the primary of the ignition coils. The PCM also provides spark retard when knock conditions are detected by a knock sensor mounted in engine block. For additional information refer to "Electronic Ignition System". Description and Operation
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