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Ignition Timing (Except Quantum): Testing

  1. To test the special coil, replace faulty coils. On vehicles with digital idle stabilizer, disconnect both plugs from the digital idle stabilizer and connect the plugs together.
  2. Detach the multiple connector from the control unit and connect a voltmeter. Turn on the ignition. If battery voltage is not indicated approximately there is trouble in the ignition switch or the wiring, which you can troubleshoot using appropriate wiring diagram in the WIRING DIAGRAMS Section.
  3. Turn off the ignition. Reconnect the multiple connector to the control unit.
  4. Disconnect the wiring between the distributor and the control unit by detaching the multiple connector from the distributor. The distributors have a wire clip that you must pry aside before you can detach the wiring.
  5. Connect the positive (+) test lead of a voltmeter to terminal 15 of the special coil: connect the negative (-) test lead to terminal 1.
  6. Turn on the ignition. The voltmeter should indicate a minimum of 2 volts for about 1 or 2 seconds and then drop to zero volts. If it does not, turn off the ignition and replace the control unit and the special coil before repeating test.
  7. Turn on the ignition. Using a jumper wire or a metal pin, briefly ground the central terminal of the multiple connector disconnected from the distributor to some clean, unpainted metal part of the engine. If the voltage at the coil does not increase briefly to at least 2 volts, check for breaks in the wire attached to the multiple connector's central terminal. If no fault is found in the wire, turn off the ignition and replace the control unit.
  8. With the ignition off, connect a voltmeter to the two outermost terminals of the multiple connector disconnected from the distributor. Turn on the ignition. If at least 5 volts are not indicated, check for breaks in the wires attached to the multiple connector's outermost terminals. If no fault is found in the wiring, turn off the ignition and replace the control unit. Reconnect the digital idle stabilizer (where applicable) when testing is complete.
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