Does PCM control fuel pump?
When the key is turned on, the powertrain control module (PCM) closes the fuel pump relay, which activates the fuel pump for about three seconds to pressurize the fuel injectors. When the engine starts, the CKP signals the PCM to keep the fuel pump and fuel delivery system running.
Does a fuel pump have a fuse?
Most fuel pumps will run a 15 (Blue) 20 (Yellow) or 25 (Clear) amp fuse. Using a fuse that’s too small will cause the fuse to blow again. This is a normal condition as the fuse isn’t rated for the higher amps of a fuel pump circuit.
How can you tell if a PCM is bad?
What Are the Symptoms of a Faulty PCM?
- Your “check engine” light is on.
- Other warning lights may be on, including traction control and ABS.
- You lose fuel economy for no apparent reason.
- Your car stutters when starting, requires multiple attempts, or won’t start at all.
- Stuttering or stalling during idling.
What would shut off power to my fuel pump?
When the engine stops running, oil pressure drops, the oil pressure switch opens, and the relay de-energizes. This provides automatic fuel pump shutdown after a crash or engine failure and prevents the fuel pump from running if the ignition remains on.
Why is my fuel pump not working?
Too much fuel into the fuel injectors can cause them to break down and fail, while too little of it can lead to the fuel pump not turning on. In order to maintain a proper mixture of air and fuel, a proper pressure of fuel is required, which is balanced with the help of a fuel pressure regulator.
Is there a relay for 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. The fuel pump relay can be found in most engine bays.