what does the main relay do in a Honda?
The main relay in a vehicle controls the fuel pump and supplies power to the injectors. Knowing how to test a Honda main relay can help you better pinpoint the cause when an electrical issue arises.
how much is a Honda main relay?
Genuine Honda 39400-S84-003 Main Relay Assembly
what are the symptoms of a bad main relay?
Symptoms of a Bad or Failing Main Relay (Computer/Fuel System)
What happens when a relay goes bad?
Despite this, sometimes the ignition relay can fail due to wearing, accident, damage or exposure to water. A bad ignition relay will not only cause starting problems to your vehicle, but it can also cause stalling or the vehicle, draining and damaging of the battery and the power loss in the dashboard lights.
Can a car relay work intermittently?
Is there such a thing as an intermittent relay failure, or do they just go all at once? Yes, they can fail intermittently. This is why a standard fix on relays it to give them a thump! Electrical problems and physical motion combined with heat and arcing
Can a car run with a bad computer?
A bad computer can do just about anything, it depends what’s wrong with it. Sometimes the car won’t run at all, and other times it’ll run, but in limp-home mode. Or it could be intermittent, like mine was. The computer would spontaneously cut out the injector pulses, but then work fine a few minutes later.
How do I know if my AC clutch relay is bad?
One of the most obvious signs that the AC relay may have a problem is that the compressor is not coming on at all. In most cases, when the AC is turned on you will be able to hear the compressor switch on. It will usually produce a familiar clicking noise from the clutch being activated.
How do I know if my fuel relay is bad?
Usually a bad or failing fuel pump relay will produce a few symptoms that can alert the driver of the issues. Engine stalls. One of the first symptoms of an issue with the fuel pump relay is an engine that suddenly stalls. Engine does not start. No noise from the fuel pump.
Will Main Relay cause car not to start?
The engine will not start If the main relay is not supplying the engine computer with the power it needs, then the engine will not be able to crank and run the right way. Failing to get the main relay replaced will usually lead to the car being unusable.
Does a fuel pump need a relay?
For fire protection, the fuel pump should be wired through an oil pressure switch to kill the pump if the engine stalls. In this case a relay is good so the pump current doesn’t go through the safety switch contacts.