![]() ![]() With the aid of some emission packages, the ASD relay provides a 12+ volt power to the oxygen sensor heater relay and sensor heating elements of the vehicle. Therefore, when the vehicle’s engine is then turned off, the ASD relay shuts down all of its activities immediately as a preventive measure to safeguard other engine components and the whole vehicle. When the vehicle’s engine is immediately up and running the automatic shutdown relay kicks off too, supplying a switched power of 12+ volts to the ignition coil and fuel injectors this helps to allow the smooth operation of the engine system. Voltage is being supplied to the remaining part of the circuit by terminal number 87. ![]() ![]() When the fuel pump and automatic shutdown relay are powered by the powertrain control module (PCM), terminal number 30 connects to terminal 87 in an on position.The rest of the circuit is not being supplied with power.Terminal 30 is being connected to terminal 87A in an off position. The powertrain control module stops the function of the fuel pump and ASD relay.Voltage is being supplied to the coil side of the ASD relay by terminal 86.The Powertrain control module grounds the ASD relay from the side of the coil through terminal 85.Note that terminal 30 is always connected to the battery for both the fuel pump and the automatic shutdown relay. First, terminal number 30 is connected to the battery voltage.The ASD relay through the logic module controls some parts of the power module it is designed in this manner in order to avoid problems like dieseling or fire outbreaks by immediately stopping the ignition system and fuel pressure when the engine has stopped running. With this article, you will be educated on how the ASD relay functions, what is required to bypass ASD relay, the step-by-step process on how to bypass ASD relay, and finally, the pros and cons of bypassing ASD relay. “This component performs the task of transmitting power (switched 12-volt) to the ignition coils and fuel injectors of vehicle engines” which gives room to produce a spark and also allows the pumping of fuel. It is a major component of the fuel and ignition systems of modern vehicle engines. The ASD relay is an acronym for Automatic Shutdown relay, but its acronym is popularly known. ![]()
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