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Home >> GMC >> 1987 >> Forward Control 6.2 J, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 13 (Engine Controls - Theory & Operation - Gasoline) >> Computerized Engine Controls >> Input Devices >> Park/Neutral Position (PNP) Switch

Park/Neutral Position (PNP) Switch

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1994 GMC Yukon, 1994 GMC Suburban, 1994 GMC Pickup, 1994 GMC Cab & Chassis, and 1994 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

This switch is connected to transmission gear selector and signals PCM when transmission is in Park or Neutral. PCM uses this information for determining control of ignition timing, converter clutch and idle speed. To check function of PNP switch, perform functional check of switch. See SYSTEM/COMPONENT TESTS - GASOLINE article in the ENGINE PERFORMANCE section.

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