Genuine Mazda Millenia Ignition Coil

Mazda Millenia Ignition Coil Parts and Q&A

• Ignition Coil
  KJ01-18-100C-9U
  Q: How is the ignition control module tested, and How to measure ignition coil winding resistance in distributorless ignition system on Mazda Millenia?

  A:

  In case of the 2.3L engine, the ignition control module is difficult to test because it is coupled with the ignition coil. In the 2.0L and 2.5L engines of 1998, the primary coil winding resistance can be measured by removing the coil pack wire harness connector, and determining the resistance in ohms between terminals indicated to be within specifications, specification being 0.45-0.55 ohms at 68 degrees Fahrenheit (20 degrees Celsius); readings out of nominal are an indication of the coil pack to be replaced. To measure the secondary coil wire resistance, the spark plug wires should first be labeled and disconnected and the resistance between the terminals on the spark plug measured, specification of 11.5-15.5k ohms at 68°F (20°C), and the spark plug wires need to be replaced where non-conforming readings are found. Disassembly of the ignition coil on the 2.3L engine is to pull off the charge air cooler of the front bank of spark plugs, the solenoid bracket of the rear bank, disconnect the ignition coil connector, and unscrew the ignition coil before fitting, which should be inspected, and screws tightened to correct torque. In the case of 1998 2.0L and 2.5L, the first step includes the disconnection of the negative battery cable, the air intake ducting removal (where necessary) and the de-connection of spark plug wires and the electrical harness followed by removal of the coil pack and installation with the required torque on the connecting bolts.