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Home >> Pontiac >> 1990 >> LeMans Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls >> Input Devices >> Park/Neutral (P/N) Switch
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Park/Neutral (P/N) Switch

P/N switch, mounted on transmission gear selector, controls a circuit to ECM used to indicate when transmission is in Park or Neutral. The ECM uses this signal to adjust idle speed (IACV function) and control Torque Converter Clutch (TCC) operation.

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