How To Bypass ASD Relay

How To Bypass ASD Relay If It’s Not Working To Start The Vehicle

Various components in a vehicle help to produce power for the vehicle to run. There is a collection of systems designed in a car for that. Some of the engine systems seen on a car include the fuel and the ignition system. The fuel and ignition system work together for the vehicle to run. One of the auto parts related to the system is the ASD relay, also known as the automatic shutdown relay. Since the ASD relay is connected to the most vital systems of a vehicle, it can be affected to produce power when damaged. When the ASD relay is worn out or fails, the vehicle will face issues producing power. In such a situation, it is best to learn how to bypass ASD relay.

The ASD relay transmits power to the ignition coils and the fuel injectors in a vehicle engine. It also portrays a security feature to the vehicle that does not allow you to start your car by turning on the ignition switch, which helps to keep your vehicle safe when you are out. The safety feature of the ASD relay automatically shutdowns the switch when it detects the fuel and the ignition system in the engine is no longer running.

However, it is common for the auto parts to wear off over time. This also applies to the ASD relay that will be subject to wear off after a certain service life. That is when it is vital to bypass the ASD relay to fix the faulty ASD relay. In this article, you will learn how to bypass ASD relay in a vehicle.

How Does The ASD Relay Work?

The ASD relay of the vehicle is powered through the switch 12 volt, which produces power to the fuel system injectors and the ignition coils of the engine, a security system that shuts off the ignition system and fuel pressure when the car is off, preventing the vehicle from starting without switching on the ignition system, and in some instances, it is seen in modern vehicles the ASD relay supplying power to the oxygen sensor heater circuit.

The ASD relay is powered by connecting to the battery voltage through a terminal that supplies voltage to the coil side of the ASD relay.

What Are The Signs Of The ASD Relay Failing

Every automobile part in a vehicle has a lifespan, and it could last if worked efficiently. As previously stated, a vehicle’s ASD relay or automatic shutdown relay will wear down after certain service life. There are many signs your vehicle will exhibit when there are issues in a failing ASD relay. Below is a brief insight on each of the signs of a faulty automatic shutdown relay.

  • The Car Immediately Stops After The Start.   

The ASD relay is connected to the fuel injectors and the ignition coil of the engine system. One of the most common issues in the vehicle was seen in the vehicle is related to the engine system that fails to produce power for the vehicle to start. It could be the lack of fuel, failing battery, loose cable wire connections, faulty alternator etc. however, a faulty ASD relay also causes issues to the engine system.

Since the ASD relay is related to the engine system, a faulty ASD relay in the vehicle can cause issues with starting the vehicle as it is one of the components related to the engine management system responsible for producing power.

  • No Crank Condition In The Engine

Another sign to figure out the issue of a bad ASD relay is when the crankshaft in your vehicle stops working, which does not allow the engine to crank. The crankshaft motor is a component wired to the engine system. Thus, the automatic shutdown relay issues can cause problems when starting the vehicle without a cranking noise.

  • Igniting Engine Light

If your engine light ignites automatically, it is probably an issue related to your vehicle’s engine system. There can be many issues related to the engine that causes a lit engine light. When the computer in the vehicle detects the issue, it transmits signals to the engine light to ignite, and one of the possible reasons is the ASD relay is failing.

When Must You Bypass The ASD Relay?

It is vital to educate yourself or have basic mechanical knowledge before bypassing an ASD relay, making it convenient to know when to bypass an ASD relay.

When bypassing an ASD relay, remember to maintain the terminal resistance using an ohmmeter. Please take note of the battery and ensure it is draining.

Some pins control the power of the ASD mode in the car; during the bypass relay, the pins must be temporarily put into the ASD relay.

Following the steps and understanding when to bypass the relay is essential. If unsure about the proceeding, it is better to consult a professional.

How To Bypass ASD Relay

Bypassing the ASD relay is a simple process with three steps. Following the steps, fixing the issue in the ASD relay will be easier. Given below are three steps explained briefly.

  1. Find the location of the ASD relay in the vehicle, which is near the battery and the power distribution centre.
  2. Disconnect the wires and cables holding the relay by unscrewing and unmounting.
  3. Refer to the wiring diagram of the ASD relay. Using a jumper cable, attach it to pins #87 and #30 on the ASD relay and bypass


It is vital to have mechanical knowledge before proceeding with the bypassing the ASD relay because it may be difficult if not followed properly. It is also safer if done properly.

The article contemplates how to bypass the ASD relay and related topics to give better insight. Including how an ASD relay works, signs that the ASD relay is failing in your vehicle and when it is most appropriate to bypass an ASD relay.

Similar Posts


  1. Hello would you mind stating which blog platform you’re working with?
    I’m looking to start my own blog in the near future
    but I’m having a tough time choosing between BlogEngine/Wordpress/B2evolution and Drupal.
    The reason I ask is because your layout seems different then most blogs and I’m looking for something completely unique.
    P.S Apologies for being off-topic but I had to ask!

  2. Hey I know this is off topic but I was wondering if you knew of any widgets I could add to my blog that automatically tweet my newest twitter updates.
    I’ve been looking for a plug-in like this for quite some time
    and was hoping maybe you would have some experience with something like this.
    Please let me know if you run into anything. I truly enjoy reading
    your blog and I look forward to your new updates.

Leave a Reply

Your email address will not be published. Required fields are marked *