To test your Honda Main Relay, first connect Pin 2 terminal on your relay to the positive terminal on your battery and the negative to Pin 1 terminal. Now check for continuity between Pin 5 and Pin 4 of the PGM-FI relay. If your relay has zero continuity in this test, it will need a replacement, if there is continuity, go to the next step.
Full Answer
How do you test a battery relay on a Honda Accord?
Consult your owner's manual or vehicle repair manual and remove the main relay. Attach the battery positive terminal to the No. 4 terminal and the battery negative terminal to the No. 8 terminal of the main relay. Then check for continuity, using a circuit tester or multimeter, between the No. 5 terminal and No. 7 terminal of the main relay.
How do I know if my Honda's main relay is bad?
There's a pretty simple way to tell if your main relay is affected. Simply turn on the vehicle and see if it continues to run. If so, the main relay is okay. Should the engine shut off, the main relay could be impacted. If you suspect you have a bad main relay in your Honda, you should perform the following test to be sure.
What is a main relay in an automobile?
Automobile designers regulate high current devices or systems, such as the starter or fuel system, with a smaller amount of current controlled through a series of relays or switches. In Honda Accords manufactured between 1986 and 1997, the main relay serves as the "middle man" helping other devices to control the ignition and fuel system.
How do you test for continuity in a battery relay?
Attach the battery positive terminal to the No. 4 terminal and the battery negative terminal to the No. 8 terminal of the main relay. Then check for continuity, using a circuit tester or multimeter, between the No. 5 terminal and No. 7 terminal of the main relay.
How do you test a Honda main relay?
There's a pretty simple way to tell if your main relay is affected. Simply turn on the vehicle and see if it continues to run. If so, the main relay is okay. Should the engine shut off, the main relay could be impacted.
How do I know if my main relay is bad?
Common signs include the engine not starting, inability to stay running for a long time, and the Check Engine Light coming on.
Where is the main relay on a Honda Accord?
0:244:58Honda Accord Relay Locations (2003-2007) - YouTubeYouTubeStart of suggested clipEnd of suggested clipUsually there's at least one box under the hood like this right here is our under hood fuse relayMoreUsually there's at least one box under the hood like this right here is our under hood fuse relay box and then there's usually one in the driver's.
What causes main relay failure?
Even in low-level signal applications, accidents and faulty UUTs can cause relay failures, and inrush currents, caused by hot-switching capacitive loads, and voltage spikes, caused by hot-switching inductive loads, accelerate relay aging.
How do I know if my Honda main relay is bad?
Bad Main Relay SymptomsUnable to Start Your Vehicle. If you try to start your vehicle and it won't start, there's a chance that you have a bad main relay. ... Check Engine Light. If you can start your vehicle, you'll notice a check engine light on the dashboard if you have a bad main relay. ... Your Vehicle Won't Stay Running.
How do I test a relay with a multimeter?
Take the leads of the multimeter and connect them across the coil terminals of the relay. For a normal coil, the multimeter should read anywhere between 40Ω to 120Ω. If the coil is damaged i.e., it is open, the meter shows out of range and you have to replace the relay.
What does the main relay do on a Honda?
1:357:28Crank No Start - Honda PGM-FI Main Relay - YouTubeYouTubeStart of suggested clipEnd of suggested clipMain relay this one is out of this car right here and as you can see that's what it looks like justMoreMain relay this one is out of this car right here and as you can see that's what it looks like just a little black box and there's two relays inside. And that's typical of these honda relays. And what
How do you check a relay?
1:196:53How to Test a Relay the Correct Way - YouTubeYouTubeStart of suggested clipEnd of suggested clipAnd then we're gonna listen for a click. There we go that's the clear. Okay so most people wouldMoreAnd then we're gonna listen for a click. There we go that's the clear. Okay so most people would stop at this and call this a good relay. But in order to be 100% sure which I strongly recommend.
Will fuel pump relay cause car not start?
A faulty fuel pump relay can also cause the engine not to start at all and be completely dead. No fuel pressure means that your engine will never start, and if the fuel pump relay failed, it would not give any power to the fuel pump to build up fuel pressure.
What happens if a relay fails?
If the relay fails it will cut off power to fuel pump and ignition system, which will result in a no power, and therefore no start condition.
How do you test an auto shutdown relay?
5:006:57How To Check ASD Relay for Power Jeep TJ - YouTubeYouTubeStart of suggested clipEnd of suggested clipBut as soon as I energize the power probe simulating the ASD relay is working it provides power toMoreBut as soon as I energize the power probe simulating the ASD relay is working it provides power to the circuits.
How do you reset a relay switch?
0:112:05How to Factory Reset Your Relay - YouTubeYouTubeStart of suggested clipEnd of suggested clipPlace the relay in a position that's easy to press and hold both of those buttons. While alsoMorePlace the relay in a position that's easy to press and hold both of those buttons. While also accessing the center. Button while holding the power and volume buttons.
How to test Honda relay?
1. To test your Honda Main Relay, first connect Pin 2 terminal on your relay to the positive terminal on your battery and the negative to Pin 1 terminal. Now check for continuity between Pin 5 and Pin 4 of the PGM-FI relay. If your relay has zero continuity in this test, it will need a replacement, if there is continuity, go to the next step. 2.
Where is the main relay located on a Honda?
Many times it will be located near your driver side footwell in most Hondas and Acuras, near the fusebox for many Civics and Integras.
Where is the main relay on a Honda accord?
On most Honda Accords, the Main Relay is located on the dash on the drivers hand side usually to the left of the steering column. (Some are located to the right of the column). This Main relay is very easy to replace yourself. It is usually clipped in and or held in place by one or two screws 10 mm screws or nuts.
What happens if a Honda accord goes bad?
Not only have I seen go bad myself on numerous occasions, but I hear about this a lot on other Honda vehicles! This Programmed Fuel Injection main Relay or PGM-FI Main Relay actually contains two individual relays. When it goes bad, one of the main solder joints inside the relay gets old and deteriorates and prevents contact which will not allow power to travel through the Main Relay out to vital components under the hood which will prevent your Honda Accord from starting.
How to remove relay from Honda accord?
Keep in mind that the socket attaches to the relay via a tab that locks the relay to the socket. Without touching any of the wires, push in the tab to release the relay or use a pocketknife to pop the relay from the socket base.
How to remove a relay from a cruise control box?
You may need to push aside wires or devices or remove devices, such as the cruise control box, that block the main relay. Use your ratchet or w rench to remove any nuts and bolts (ratchet counterclockwise) attached to a device to expose the main relay or any that hold the main relay in place.
Why does my relay stop working?
Often a relay stops working because a soldered joint has cracked causing resistance in the relay and a voltage drop. Symptoms of cracked solder include motor overheating or a relay that feels hot when touched. By resoldering cracked or worn areas, you can restore a non-working relay and avoid purchasing new parts.
Why won't my Honda Accord start?
If your Accord won't start, then you may have a damaged or broken main relay.
Can a loose relay cause melting?
Also, keep in mind that your new relay must fit snugly within the socket as a loose relay can overheat or cause melting of the outer casing when current runs through it.
