Abstract: An ignition module tester is provided for testing ignition modules associated with motor vehicles. The ignition module tester includes an oscillator for simulating an output signal from the pick-up coil associated with the ignition module being tested. An EXCLUSIVE-OR GATE is provided for comparing the output from the oscillator with an output signal from the ignition module, with any variance detected being indicative of a faulty ignition module. The oscillator outputs a signal at approximately equal to the frequency of a pick-up coil associated with a vehicle operating at 150 MPH, or approximately 500 Hz, such that a greater accuracy is provided by the ignition module tester as compared to conventional devices. In another embodiment, an ignition module tester is provided for testing a distributorless ignition system (DIS). The ignition module tester for use with DIS ignition modules is contained within a housing, with a plurality of leads being provided for making appropriate electrical connections.

Abstract: An ignition coil tester for testing ignition coils associated with motor vehicles. The ignition coil tester includes an oscillator for simulating an output signal from the ignition module associated with the ignition coil being tested. A short circuit detector is provided for detecting a short circuit within the ignition coil. An open coil indicator is proved for indicating an open circuit within the ignition coil. A series of visual indicators are provided for indicating the strength of a signal being output by the ignition coil.