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Home >> Pontiac >> 1989 >> LeMans Base, Standard >> Repair and Diagnosis >> Engine Performance >> Theory and Operation >> Theory/Operation >> Introduction >> Input Devices >> Park/Neutral (P/N) Switch
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Park/Neutral (P/N) Switch

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

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