how to bypass asd relay

How to Bypass ASD Relay: A Step-by-Step Guide

In the realm of automotive troubleshooting, understanding how to bypass an ASD (Automatic Shutdown) relay can be a valuable skill. Whether you’re dealing with a malfunctioning relay or you’re in a situation that demands quick action, knowing the ropes of bypassing an ASD relay can save the day. In this comprehensive guide, we’ll walk you through the process step by step, ensuring that you have a clear grasp of the procedure. So, grab your tools, put on your DIY hat, and let’s dive into the world of ASD relay bypassing.

Understanding the ASD Relay

The ASD relay is like a gatekeeper for your vehicle’s engine components. It controls the flow of power to critical parts that enable ignition and fuel injection. When it functions properly, the engine starts smoothly. However, a faulty ASD relay can disrupt this process, leading to a range of problems.

Symptoms of a Faulty ASD Relay

Before delving into the bypassing process, it’s crucial to recognize the symptoms of a malfunctioning ASD relay. These include a check engine light turning on, engine cranking failure, stalls, acceleration lag, and clicking noises. Identifying these signs can help you determine if the ASD relay is the culprit.

download 2023 08 12T141507.312

Tools You’ll Need

Before you start the bypassing process, gather the necessary tools. You’ll need wire cutters or strippers, a screwdriver, jumper cables, and a basic understanding of your vehicle’s wiring structure.

Step-by-Step Guide: Bypassing the ASD Relay

Locate the ASD Relay

Open the power module that houses the ASD relay. Examine the terminals and the wiring structure diagram to familiarize yourself with the components.

Identify and Disconnect Components

Energize the coil to create a flexible terminal. Understand the wiring connections and components connected to the ASD relay.

Bypassing with Jumper Cables

Locate pins #30 and #87 near the ASD relay. Use jumper cables to create a bridge between these pins, effectively bypassing the ASD relay.

Testing a Faulty ASD Relay

Before bypassing the relay, it’s essential to confirm that it’s indeed faulty. Use a multimeter to test various terminals and assess continuity. This step ensures accurate diagnosis.

When Should You Bypass the ASD Relay?

Bypassing the ASD relay is a solution when your vehicle faces starting issues due to a malfunctioning relay. It’s also useful in emergency situations where you need a quick jump start or when assisting another vehicle with jumper cables.

Potential Risks and Precautions

While bypassing the ASD relay can be helpful, it’s important to note that improper procedures can lead to electrical damage or safety hazards. Always follow the steps carefully and prioritize safety.


Learning how to bypass an ASD relay is a valuable skill for any automotive enthusiast. It empowers you to troubleshoot starting issues and assists others in emergencies. Remember to exercise caution, follow safety protocols, and have your vehicle diagnosed by professionals if needed. With this guide, you’re now equipped to confidently tackle ASD relay-related challenges and get back on the road with minimal disruption.


Yes, a fuel pump relies on the fuel pump relay to receive power. Without a functioning relay, the fuel pump won’t run.

Absolutely, you can jumpstart a car without direct access to the negative terminal. Connect the negative clamp to an unpainted metal surface on the engine block.

The absence of a relay can lead to premature electronic component failure, particularly impacting the longevity and efficiency of switches and related components.

Yes, a malfunctioning ASD relay can disrupt the proper flow of electricity, potentially leading to battery drainage and ignition failure.

Yes, it’s possible to remove jumper cables while your car is running. However, make sure to follow the correct sequence: first, disconnect the black clamp from the grounded metal part, then disconnect the black clamp from the donor battery, and finally disconnect the red clamp from the donor battery.

Similar Posts

One Comment

Leave a Reply

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