What is an automatic shutdown relay?
An automatic shutdown relay (ASD) is an electrical switch that helps provide power to your vehicle and is connected to your ignition system.
When the ignition switch is in the “OFF” position, the automatic shutdown relay prevents any power from reaching other major components of your car, like the fuel pump relay.
When you turn your ignition switch into the “ON” position, power is then supplied to all electrical components, the fuel pump, and the injectors—but only during cranking. After you let go, it’s turned off again, preserving your fuel system.
When should I replace the automatic shutdown relay on my car?
You should replace the automatic shutdown relay on your car when you see clear deterioration, or when you experience the following symptoms:
Stalling vehicle: This is the most common problem associated with a failing automatic shutdown relay. The engine often starts, but stalls out almost instantly. With a faulty starter relay, power is unable to reach different circuits and parts of your car, meaning it might be time to have it replaced.
Engine doesn’t turn on: Another symptom of a depleting starter relay is an engine that just won’t start. This most likely means that the power required to juice up your battery isn’t reaching it, leaving your car stagnant. Similarly, a dead battery is another sign that your main relay may need tending to.
Check engine light: One simple way to determine any automotive complications is if your dashboard is illuminated. If your ASD relay isn’t functioning properly, the check engine light will turn on, alerting you of a potential problem.
Lag while accelerating: Lag can appear as a sign that your automatic shutdown relay is in need of replacement. If the ASD relay is damaged, then the other components can drop in voltage. However, this symptom doesn’t happen as frequently.
How often should an automatic shutdown relay be replaced?
Most automatic shutdown relays last up to 50,000 cycles, or the lifespan of your vehicle. However, this depends on various factors like how often you drive. If you drive more regularly than the average commuter, it’s possible that this could wear down your automatic shutdown relay faster than expected.
Can I replace my automatic shutdown relay myself?
Yes, as the procedure is fairly straightforward and can be completed in your driveway. Using your owner’s manual, you should easily be able to get to your automatic shutdown relay. However, if you’re unsure of the location or not confident in your ability to complete an automatic shutdown relay replacement, it’s best to take your vehicle to a licensed mechanic for further assistance.