How do you know if a relay is not working?
The only tool required to check a relay is a multimeter. With the relay removed from the fuse box, the multimeter set to measure DC voltage and the switch in the cab activated, first check to see if there are 12 volts at the 85 position in the fuse box where the relay plugs in (or wherever the relay is located).
How can I tell if my fuel pump relay is faulty?
2. Engine does not start. Another symptom of a faulty fuel pump relay is an engine that does not start. If the fuel pump relay fails the fuel pump will be left without power. The engine may still crank when the key is turned, however it will not be able to start due to lack of fuel.
How does a fuel pump relay control the fuel pump?
The fuel pump relay is usually controlled by the ignition or Powertrain Control Module, and when switched on, will provide current to the fuel pump so that it may function. As the fuel pump relay controls power to the fuel pump, any faults with it can cause issues with the fuel pump,…
What happens if the fuel pump does not work?
Without a working relay, the pump cannot inject the necessary fuel to complete the ignition process. Note that you may still hear the engine making noise when you try to start your vehicle even if the relay does not work. Other parts of your car’s engine might be in working order, but they won’t have fuel. 2. The Engine Starts and Stalls
Where are the relays on a Mitsubishi fuel pump?
They are located in the relay group in the dash. The first relay is located in the bottom corner of the group and the second one should be to the right of it with one blank space in between them. (It is common for these relays to be wrongly re-installed after diagnostics checks are done.
What are the symptoms of a bad fuel pump relay?
One of the first symptoms of an issue with the fuel pump relay is an engine that suddenly stalls. If the fuel pump relay has an issue while the vehicle is operating it will cut off power to the fuel pump, which will cause the engine to stall.
What does a bad fuel pump relay do?
A bad fuel pump relay will cut the power to your car and stall the engine while you are driving. Keep in mind that a bad fuel pump relay might be faulty or in total failure. In either example, the engine might stall. A relay that is faulty might allow you to restart your engine after you give it a break.
Why do fuel pump relays go bad?
The relay can go bad due to a number of reasons from dust to electrical power surges, anything can affect the well-being of a fuel pump relay. Both dust and sudden voltage increases can influence a fuel pump relay’s performance and cause the vital function of an engine to malfunction.
Will fuel pump run if fuel pump relay is bad?
If the fuel pump relay has an issue while the vehicle is operating it will cut off power to the fuel pump, which will cause the engine to stall . A faulty relay may allow the vehicle to be restarted a short while later, while a completely failed relay will not.