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Pick-Up Coil Short Check

  1. On Mercedes-Benz vehicles, connect one ohmmeter lead to ground. Attach other lead to control module harness terminal 3 and then to terminal 7.
  2. On all other models, connect one ohmmeter lead to ground. Attach other lead to terminal 7, then to terminal 31d. Resistance reading should be greater than 200, 000 ohms for Mercedes-Benz vehicles and infinity for all other models.
  3. If resistance reading was not correct, disconnect harness from distributor. Connect ohmmeter leads to ground and to each pick-up coil pin in distributor. If readings are now correct, replace harness. If readings are still incorrect, replace pick-up coil.
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