Genuine Mazda B2000 Ignition Coil

Mazda B2000 Ignition Coil Parts and Q&A

• Ignition Coil
  FE85-18-100
  Q: How to test ignition coils for resistance and insulation on Mazda B2000?

  A:

  To check piston engines up to 1981, check the primary resistance by applying an ohmmeter across the positive and negative terminals of the coil, which must give 0.9O w/0.090 at 68 degree C. When secondary resistance, connect the ohmmeter across the center tower connector with the positive terminal with a reading expected of 6-30K Ohms at the same temperature. Assuming it is available, connect a megaohm tester between the negative and outside the coil casing to test insulation where 10M ohms would be desirable. When using piston engines of type 1982-1989, an ohmmeter is connected to the plug and the minus primary connector, targeting about 1-1.3 ohm except that the 2,654cc engine should target around 0.72-0.88 ohms. Upon removal of the high tension wire, measure the resistance between the minus and the metallic connector in the coil tower, which should be 10,000-30,000 Ohm. To test bad insulation, check the resistance between the coil (-) primary connection and metal body, less than 10M leaks are replaced by coil. Once the coil has been tested, check the igniter and pickup coil and make sure that there are no simple maintenance problems in the secondary circuit. Check the cap and rotor tracks or cracks, and check the resistance of the wire, which should be 16,000 ohms per 100cm. In the case of rotary engines, primary resistance on the terminals must be measured and should be 1.35 ohms on the leading coil and 1.46 ohms on the trailing coil, secondary resistance should be 8.7K ohm and 9.5K ohm respectively. Adjust the external resistor of each coil until you have 1.4 ohms on the leading coil and 1.6 ohms on the trailing coil. To remove and install, disconnect negative battery cable and make sure that the ignition switch is off. Eliminate protective boots on the coil, pull gently on the high tension wire, observe routing, colors of primary wires and remove nuts and lockwashers and clean terminals as necessary. Lastly, reverse the reversal of the new coil and make sure the primary connections are tight and the coil-to-distributor wire is properly seated.