Distributor Pick-Up Coil Short & Resistance Checks

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

Courtesy of GENERAL MOTORS CORP.