Mazda Car 2002-04

Diagnosis & Testing

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  1. Disconnect the ignition coil connector.
  2.  
  3. Measure the resistance using an ohmmeter as follows:
    1. From terminal A to terminal B, and terminal B to terminal C on 2.0L (FS) models. The resistance should be 0.45-0.55 ohms. If not as specified, replace the ignition coil.
    2.  
    3. From terminal A to terminal D, and terminal B to terminal D on 2.5L (KL) models. The resistance should be 0.45-0.55 ohms.

      Click image to see an enlarged view

      Fig. Ignition coil terminals-2.0L (FS) models



      Click image to see an enlarged view

      Fig. Ignition coil terminals-2.5L (KL) models

    4.  

  4.  

2.5L (Kl) Engine



  1. Disconnect the ignition coil connector.
  2.  
  3. Measure the primary coil winding resistance using an ohmmeter as follows:
    1. From terminal A to terminal B. The resistance should be 0.49-0.73 ohms. If not as specified, replace the ignition coil.

      Click image to see an enlarged view

      Fig. Ignition coil terminals-Millenia 2.5L (KL) models

    2.  

  4.  

3.0L (Aj) Engines



  1. Remove the ignition coil.
  2.  
  3. Measure the resistance between the two terminals of the connector. The resistance should be 0.45-1.15 ohms at room temperature.
  4.  
  5. Measure the resistance between terminal A to ignition coil boot socket using a tester. The resistance should be 5-6 kilohms at room temperature.
  6.  
  7. Measure the insulation resistance between terminal A to ignition coil case using a tester. The resistance should be 10 megaohms or more at room temperature.

    Click image to see an enlarged view

    Fig. Ignition coil testing-3.0L (AJ) engines

  8.  

  1. Remove the ignition coil.
  2.  
  3. Measure the resistance between the two terminals of the connector. The resistance should be 0.45-1.15 ohms at room temperature.
  4.  
  5. Measure the resistance between terminal A to ignition coil boot socket using a tester. The resistance should be 5-6 kohms at room temperature.
  6.  
  7. Measure the insulation resistance between terminal A to ignition coil case using a tester. The resistance should be 10 megaohms or more at room temperature.

    Click image to see an enlarged view

    Fig. Ignition coil testing-3.0L (AJ) engines

  8.  

Case Insulation Test



  1. Disconnect the spark plug wire.
  2.  
  3. Disconnect the ignition coil connector.
  4.  
  5. Measure the insulation resistance from terminal 1A to ignition coil case, and terminal 2A to ignition coil case using an ohmmeter. If the resistance is not above 10 megaohms, replace the coil.

    Click image to see an enlarged view

    Fig. Case insulation test-Miata

  6.  

  1. Disconnect the spark plug wire.
  2.  
  3. Disconnect the ignition coil connector.
  4.  
  5. Measure the insulation resistance from terminal 1A to ignition coil case, and terminal 2A to ignition coil case using an ohmmeter. If the resistance is not above 10 megaohms, replace the coil.

    Click image to see an enlarged view

    Fig. Case insulation test-Protégé with 1.6L (ZM) and 2.0L (FS) engines

  6.  

Except 3.0L (Aj) Engines



  1. Remove the ignition coil.
  2.  
  3. Remove the spark plug.
  4.  
  5. Attach the plug to the ignition coil and attach the ignition coil connector.
  6.  
  7. Ground the spark plug, crank the engine for about 5 seconds at a time and see if a spark occurs. If spark occurs the coil is working normally.
  8.  
  9. Disconnect the ignition coil connector.
  10.  
  11. Measure the resistance between each terminal on the ignition coil connector using an analog circuit tester.
  12.  
  13. With the positive lead of the Ohmmeter connected to terminal C and the negative lead connected to terminal A, the resistance should be infinite. If not replace the coil
  14.  
  15. With the positive lead of the Ohmmeter connected to terminal A and the negative lead connected to terminal C, the resistance should be infinite. If not replace the coil
  16.  
  17. With the positive lead of the Ohmmeter connected to terminal C and the negative lead connected to terminal B, the resistance should be infinite. If not replace the coil
  18.  
  19. With the positive lead of the Ohmmeter connected to terminal A and the negative lead connected to terminal B, the resistance should be around seven Kilo ohms. If not replace the coil
  20.  
  21. With the positive lead of the Ohmmeter connected to terminal B and the negative lead connected to terminal A, the resistance should be around seven Kilo ohms. If not replace the coil

    Click image to see an enlarged view

    Fig. Ignition coil terminals

  22.  

  1. Remove the ignition coil.
  2.  
  3. Remove the spark plug.
  4.  
  5. Attach the plug to the ignition coil and attach the ignition coil connector.
  6.  
  7. Ground the spark plug, crank the engine for about 5 seconds at a time and see if a spark occurs. If spark occurs the coil is working normally.
  8.  
  9. Disconnect the ignition coil connector.
  10.  
  11. Measure the resistance between each terminal on the ignition coil connector using an analog circuit tester.
  12.  
  13. With the positive lead of the Ohmmeter connected to terminal C and the negative lead connected to terminal A, the resistance should be infinite. If not replace the coil
  14.  
  15. With the positive lead of the Ohmmeter connected to terminal A and the negative lead connected to terminal C, the resistance should be infinite. If not replace the coil
  16.  
  17. With the positive lead of the Ohmmeter connected to terminal C and the negative lead connected to terminal B, the resistance should be infinite. If not replace the coil
  18.  
  19. With the positive lead of the Ohmmeter connected to terminal A and the negative lead connected to terminal B, the resistance should be around seven Kilo ohms. If not replace the coil
  20.  
  21. With the positive lead of the Ohmmeter connected to terminal B and the negative lead connected to terminal A, the resistance should be around seven Kilo ohms. If not replace the coil

    Click image to see an enlarged view

    Fig. Ignition coil terminals

  22.  

Secondary Coil Winding



  1. Remove the ignition coil.
  2.  
  3. Measure the resistance using an ohmmeter from lead hole 1 to lead 4 and lead hole 2 to 3. the resistance should be 7-11 kohms. If not replace the coil as the secondary coil winding is defective.

    Click image to see an enlarged view

    Fig. Secondary coil winding test-Miata

  4.  

  1. Remove the ignition coil.
  2.  
  3. Measure the resistance using an ohmmeter from lead hole 1 to lead 4 and lead hole 2 to 3. the resistance should be 7-11 kohms. If not replace the coil as the secondary coil winding is defective.

    Click image to see an enlarged view

    Fig. Secondary coil winding test-Protégé with 1.6L (ZM) and 2.0L (FS) engines

  4.  

 
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