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Distributor Pick-Up Coil Short And Resistance Checks

  1. Disconnect pick-up coil leads from HEI-EST module "N" and "P" terminals (usually a Green and a White wire). To check for shorted pick-up coil, set ohmmeter in middle range. Connect one lead to either pick-up coil lead and other lead to distributor housing. See Fig 1and Fig 2. Reading should be infinite. If not, replace pick-up coil.
    Fig 1: Distributor Pick-Up Coil Short and Resistance Checks (Integral Coil)
    G09316136Courtesy of GENERAL MOTORS COMPANY
  2. Connect ohmmeter leads to both pick-up coil leads, while flexing wires and connectors to locate intermittent opens. See Fig 1and Fig 2. Resistance should read a constant unchanging value between 500 and 1500 ohms. If not, replace pick-up coil.
    Fig 2: Distributor Pick-Up Coil Short and Resistance Checks (External Coil)
    G09316137Courtesy of GENERAL MOTORS COMPANY
    Fig 3: Testing Hall Effect Switch
    G09316138Courtesy of GENERAL MOTORS COMPANY
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