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Pick-Up Coil Short Check

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