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Home >> Geo >> 1990 >> Prizm Base, 4D Hatchback, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Ignition System >> Ignition Timing Control System >> Ignition Timing Advance Control

Ignition Timing Advance Control

Ignition timing is controlled by ECM based upon sensor input signals. Input signals may be supplied by coolant temperature sensor, pick-up coil/crank angle sensor, MAP sensor (Prizm), MAF sensor (Prizm GSi), knock sensor (Prizm GSi), throttle position switch or sensor and vehicle speed sensor.