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Home >> Geo >> 1994 >> Metro Base, 2D Hatchback, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls >> Input Devices >> TCM Gear Signal (Metro A/T)
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TCM Gear Signal (Metro A/T)

On A/T equipped vehicles, ECM monitors a voltage signal sent from Transaxle Control Module (TCM) when transaxle is in any position except Park or Neutral. ECM uses this input signal to help control fuel injector and Idle Air Control (IAC) valve (Standard Emissions) or Idle Speed Control (ISC) motor (Upgraded Emissions).