An ignition module is an electrical switch that turns the power on or off, to the vehicles coil. This coil is connected to the distributor, where the power is used by the spark plugs in the engines combustion chamber. Modern vehicles do not have a distributor, instead use a computerized system, and the ignition coil acts as an electrical switch, like a system with a distributor installed. Both systems need the ignition module to deliver 12,000 to 20,000 volts of current to the spark plugs,in order to create the spark. The ignition module works by receiving a signal from a magnetic pickup or Hall effect sensor in the distributor, or by the engine's computer. The module uses this signal to open and close the ground circuit to the ignition coil,in order to fire the spark plugs.
Ignition modules are electrical and do not have any moving parts, therefore, they tend to be one of the most reliable parts in the engine. If the ignition module fails, the cause of the failure is typically due to heat which has been generated by improper wiring of the ground wire, to battery voltage. The location of the ignition module varies depending on the vehicle's manufacturer.
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