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Distributor Pick-Up Coil Short & Resistance Checks

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1994 GMC Vandura Special, 1994 GMC Vandura, 1994 GMC Rally Camper Special, 1994 GMC Rally, and 1994 GMC Forward Control. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect pick-up coil leads from module. Using ohmmeter, check pick-up coil resistance. Connect ohmmeter to distributor housing and either pick-up coil lead (step 1 in illustration). See Fig 1. Flex pick-up coil leads by hand to check for intermittent short to ground. If reading is not always infinite, replace pick-up coil.
  2. Connect ohmmeter between pick-up coil leads (step 2 in illustration). See Fig 1. Check for intermittent open by flexing wires and connectors. If resistance is not 500-1500 ohms, replace pick-up coil.
Fig 1: Checking Distributor Pick-Up Coil
G93I76560Courtesy of GENERAL MOTORS CORP.
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