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Ignition Coil Circuit Check

  1. Disconnect control module and coil connectors and inspect for dirt or damage. Connect one ohmmeter lead to harness connector terminal mating with control module green wire. Connect other lead to end of same wire disconnected from coil "TACH" terminal.
  2. If less than 2 ohms, resistance is OK. Proceed with test. If more than 2 ohms, service open in wiring harness "TACH" wire and inspect for corrosion.
  3. Connect ohmmeter leads in same manner to harness terminal connecting with control module red wire and to other end of wire disconnected from coil "BATT" terminal.
  4. If less than 2 ohms, resistance is OK. Proceed to next test. If greater than 2 ohms, service ballast resistor wire for open or corrosion.
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