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All Except Vanagon

  1. Disconnect both plugs at idle stabilizer control unit and connect them together. Attach positive lead of voltmeter to terminal 15 and negative lead to ground. Turn ignition switch "ON". Voltage must be present.
  2. Disconnect coil high tension wire from distributor cap. Disconnect connector at distributor. Connect positive terminal of voltmeter to terminal 1 of ignition coil and negative lead to ground. Turn ignition switch "ON". A voltage reading of at least 12 volts should be read. If voltage drops below 12 volts within 1 second, turn ignition switch "OFF" and replace defective ignition control unit.
  3. Disconnect green/white wire at connector on distributor and ground the wire. Voltage reading must be approximately 12 volts. Disconnect green/white wire from ground and voltage must drop shortly to 6 volts.
  4. If voltage does not drop, replace defective ignition control unit. Connect voltmeter positive lead to red wire (connected to terminal 5) at distributor connector. Attach negative lead to brown wire (connected to terminal 3). Turn ignition switch "ON". Voltmeter must read about 10 volts. If not, replace ignition control unit.
  5. If other tests fail to locate defective components, substitute a known good ignition control unit and retest for secondary voltage spark.
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