When does the fuel pump relay do not work?
No fuel pump operation, butthefuel pump operates when its relay is jumpered between pins 30 and 87/2 The engine will not rev higher than 3000 RPM Engine will not start, spark plugs are dry and the ignition system produces spark. Multiple error codes, sometimes randomly generated, despite using known good sensors and components. ECU Diagnosis.
How to check fuel injection and radio suppression relays?
First check the fuel injectionsystem and radio suppression relays. Check all the sensorinputs to the ECU at the connector: you can remove the small screw and wire tie on the cover, pull it off, and remove the little “haircomb” plastic piece on the side which exposes all connectors without actually disconnecting the ECU itself.
What to do if your fuel pump goes out?
Symptoms…No prior warning, car usually breaks down on road or fails to start when warm through loss of fuel pump relay control. Diagnostic checklist: ACCURATELY Identify fuel pump relay and remove. Now take a small piece of wire to jumper terminals 30 and 87/2 on the relay board (the terminals are identified on the relay module pins). USE CARE.
Can you replace fuel pump relays in a Volvo?
After one particularly stupid $200 tow bill, I made it a point to replace the original Fuel Pump Relays in my older Volvos with NEW ones, and then I would carry a good used one as a spare in my glovebox, just in case.
Where do you find the fuel pump relay?
When you shut off the ignition, it powers down the fuel pump. In most vehicles, the fuel pump relay can often be found in the fuse box in the engine bay, which is usually a long black box which contains fuel pump relay along with various other fuses and relays.
Is the fuel pump relay controlled by the PCM?
Consequently, the fuel pump relay is usually controlled by, the ignition or powertrain control module (PCM). As a result, when switched on, the fuel pump relay; will provide current to the fuel pump, so that it may function. Therefore, any faults with it, can cause fuel pump issues.
What are the symptoms of a bad fuel pump relay?
A bad fuel pump relay can cause many different symptoms. Here are the most common ones The fuel pump relay is an important component of the fuel system of your vehicle. The fuel pump relay gives the fuel pump power when it is time to build up fuel pressure in the rail.
Why does the fuel pump relay need to be Tip Top?
The fuel pump relay needs to function in tip-top condition if the engine is expected to run without any issues. Therefore, any compromise in the fuel pump relay can directly cause engine problems, such as the stalling of the engine.