2001 Honda Accord Won’t Start When It’s Hot Outside

Honda vehicles are known for having difficulties starting when there is a hot temperature outside. For example, after you have just driven into a gas station for a fill-up. Even a quick trip to the grocery store.

So, why 2001 honda accord won’t start when it’s hot outside?

It’s because of a relay of a certain type. The relay seems to be mounted on a pipe that is known to break over time. Your automobile becomes warm because of the hot temperature. Then the pipe mounted on expands and prevents the contact on the relay from connecting. As a result, it doesn’t start.

This is actually a common problem for the 2001 Honda Accord. Let’s get going for solutions.

The Main Relay Should Be Checked

A malfunction with the primary relay an electrical mechanism. It opens and shuts the gasoline flow to the engine. It is a typical cause of this symptom. 

Check out the following test to see whether you do actually have this issue:

Set the engine speed to about 2,500 rpm. And use a piece of strong wire to keep the throttle linkage in place. Close the hood and let the engine run for around 20 minutes.

Turn the engine off and disconnect the wiring from the throttle linkage. Allow the engine to sit for 5 minutes before attempting to restart it numerous times. Turn the engine on if the engine won’t start. 

The engine light will illuminate for two seconds before turning off. During the two seconds, you should hear the gasoline pump running. You should notice the primary relay click whenever the light goes out.

If the main relay does not make this clicking sound, check terminal seven (fuel pump). It is for energy as well as output eight for neutral. The primary relay is probably broken. If you don’t have electricity despite a good connector on terminal eight.

How to Check a Honda’s Main Relay

Automotive relays are found in almost every car on the road today. These components are essentially switches that use electromechanical. As well as electrical ways to open and shut a circuit. 

The relay acts as a conductor between two low-amperage circuits. It enables it to switch on or off a higher-amperage circuit.

These components are critical for a vehicle’s electrical performance, as well as its safety. If you connect your headlights straight into a light switch. For example, you risk exceeding the ampere rating and causing an electrical fire. 

Relays may also turn on numerous items at once using a single output. It enables you to switch on the car’s radio as the antenna expands, for example. A vehicle’s primary relay regulates the fuel system and provides electricity to the injectors. 

When an electrical problem emerges, you should how to check a Honda primary relay. It will help you find the source.

Even the most dependable automobiles, such as Hondas, may have a variety of electrical troubles. Which is from time to time. One of these issues might be the primary relay. 

Fortunately, you may not need to run to a professional to get your Honda’s relay checked. You could do it yourself if you follow a few basic instructions.

There’s a quick method to see whether your primary relay is damaged. Simply start the car and check whether it keeps running. If this is the case, the primary relay is in good working order. 

The primary relay may be compromised if the engine shuts off.

If you believe your Honda’s main relay is faulty. Then you should do the tries to complete to be certain. Because most parts providers do not accept returns on electrical components. 

It may save you time, money, and irritation. That’s why it’s critical to avoid purchasing parts you don’t need. This diagnostic test may also be beneficial if your Honda has hot start issues that impair cranking. 

Consider printing it to use as a reference when testing the relay. This is how you do it:

Remove the primary relay by consulting your owner’s handbook. You can use the car maintenance manual as well. 

Connect the battery terminal of the battery to the No. 4 wire of the primary relay. And the charge negative end to a No. 8 terminal. Then, using a wiring tester or multimeter, verify for continuity between the No. 5. As well as No. 7 terminals of the main relay. 

If there is a sense of continuity. Reinstall the relay and retest when there is no continuity.

Connect the battery NPN transistor to the No. 5 wire of the primary relay.

As well as the battery negative end to the No. 2 terminal. Then make sure there’s no continuity between the main relay’s No. 1 and No. 3 terminals. 

If there is a sense of continuity. Reinstall the relay and retest when there is no continuity.

Connect the battery NPN transistor to the No. 3 wire of the primary relay. And the battery negative end to a No. 8 terminal. 

Then verify for continuity between the main relay’s No. 5 and No. 7 terminals. The relay is OK if there is continuity. Continue testing along with the purpose of controlling the fuel system.

If you find the gasoline engine still does not operate. Repair the relay and retest when there is no continuity.

The Consequences of a Failed Relay

The issue is the same in all Honda models. If the primary relay fails, the symptoms vary. You may lose fuel pressure in an Accord

You may run out of power towards the injector. And the fuel pump if the primary relay on a Civic fails. But you will not lose fuel flow since the fuel injection cannot open without electricity. 

Since this computer does not sense power on the grounded side of the injector. It is when the main relay fails. As well as there is no voltage at the injector. It will set a number 16 programming message for that injector.

Other Potential Sources of Hot Start Issues

Before you jump in too quickly, keep in mind that the automobile might be having many issues. That is making it difficult to start. It’s also possible that you have a faulty ignition switch, igniter, or ignition coil. 

To check for spark, start with a basic spark test and then go on to the coil itself. Unfortunately, you’ll need an automotive analyzer to test that igniter itself. Something you certainly don’t have in your home shop.

These products may become handy for you:

A faulty main relay will exhibit the same indications as a faulty coil or igniter. However, the primary relay fails most frequently when the weather is extremely hot. But the other likely reasons show the symptom almost all of the time. 

Although a malfunctioning main relay may cause a difficult start now and again. It is typically not enough to cause concern. Despite the temporary difficulties, you can generally get the engine started. 

However, if an ignition coil or a circuit fails, the vehicle will not start. It happens until it has cooled down.

Before Changing the Main Relay

You may suspect the main relay is to blame. You should perform a Honda Primary Relay Check to be sure. Nothing is more frustrating than replacing a costly electrical component. 

Only to discover that it’s not the source of the issue at the time. Remember that many component providers have a “no return” policy on electrical items. Replacing a primary relay may cost $50 or even more.

So make sure it’s in good working order before replacing it. However, if you’re very certain that the primary relay is the source of your hot-start issue. Replacing it yourself may save you at least $100 in service garage labor costs.


Why Would My Honda Start But Not Run?

It’s possible that your engine spins but won’t start or operate. Because it’s having difficulties making a spark, receiving gasoline, or creating compression. Problems with the ignition (for example, a defective ignition coil). The fuel system is the most typical culprit.

What Sensor Might Make an Automobile Refuse to Start?

A crankshaft sensor (crank sensor) is an essential device for tracing the crank position. As well as detecting engine RPM. If the crank position sensor malfunctions, the automobile will not start. It’s possible that the crank sensor could fail or that its wire will be damaged. The automobile may stall or refuse to start as a result of this.

Will a Faulty Crank Sensor Result in a No-Start Situation?

The first sign of a sensor problem that causes the crank to stall might be a stalling out. The appearance of your check engine light. If you keep driving after the condition gets serious, the engine may suffer considerable damage.


We hope that you’ve found out the reason & solution why the 2001 honda accord won’t start when it’s hot outside.

Now just keep those necessary things in your head. As a result, you’ll never face these problems. 

Have safe driving with your Honda Accord!

Rob Dahm

Leave a Comment

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