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Home >> Jeep >> 1999 >> Cherokee Limited, 2.5 P >> 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

On vehicles equipped with automatic transmission, a gear position indicator signal is sent to the PCM when gear selector lever is in Park, Neutral or Drive positions. PCM uses this signal to determine idle speed (varies with gear position), fuel injector pulse width, ignition timing advance and vehicle speed control operation.