Where is the fuel pump relay output on an ECU?
The EFI / fuel pump relay output triggers the negative of the fuel pump relay. The setting in the ECU must be set to be fuel pump relay, and you can find it under Functions -> EFI / Fuel pump relay output. If you want to disable the fuel pump relay, then you can set it to “none”.
Can a modular ECU drive an EFI relay?
Modular ECUs have the ability to drive an EFI relay, and if your application doesn’t require ECU control of an EFI relay, you can use this output as a fuel pump relay control. This output can only switch to ground, it can’t source current (that is, drive an output high). So if it’s going to be used to drive a relay
What causes damage to Mercedes Benz over voltage relay?
Damage can be done to the relay when attempting to jump-start your vehicle with another. If you have jump-started your car and it starts running rough at idle or you are experiencing hard cold or hot starts you may have damaged your OVP.
Where is the OVP relay located on a Mercedes Benz?
On W126 chassis it is located between the 2 firewalls underneath the hood. On W107 chassis it’s located behind the right kick panel. Check the 10 amp fuse on top of it first. If it is blown, replace it. If it is good, check the socket that that the fuse sits in for corrosion. Clean and/or replace as necessary.
What happens if the overload protection relay is blown?
No voltage equals all kinds of drivability problems. Tech Tip: When checking voltage at the pins of the overload protection relay pin 30 is hot with the key on and pins 87 are the output voltage to the control units. If the relay is blown there will not be voltage present at pins 87.
What does the Mercedes over voltage protection relay do?
The Mercedes over voltage protection relay provides voltage to the ABS and Mercedes engine control units. In the case of hard start, when you cut off the voltage supply to the engine control unit, you loose all of your cold idle circuits.
How does the engine control unit control the injector pulse?
Question: What controls the fuel injector pulse? Ans: The engine control unit is the electronic brain that used to control the fuel injector pulse by gathering data from various sensors along the fuel line
What does it mean when there is no injector pulse?
In case of that, there is no injector pulse or spark, this means that is your ECU has failed in operating in this case you have to get your ECU changed or visit an expert. You May Like: Low Fuel Light Comes on When Tank Is Full Causes and How to solve it Question: What controls the fuel injector pulse?
Why do I have a problem with my fuel injection pump?
Fuel injection problems, therefore, are one of the most pressing engine issues to deal with. Whether you’ve experienced fuel injector failure or not, it helps to understand the fuel injector pump, how it relates to engine performance, and also how diesel fuel injection pumps differ from traditional gasoline-powered units.
Question: What controls the fuel injector pulse? Ans: The engine control unit is the electronic brain that used to control the fuel injector pulse by gathering data from various sensors along the fuel line
What causes no power to fuel injector pulse?
Ans: The engine control unit is the electronic brain that used to control the fuel injector pulse by gathering data from various sensors along the fuel line Question: What causes no power to fuel injectors?
How does the engine control unit ( ECU ) work?
The Engine Control Unit (ECU) is the central computer or “brain” of any vehicle and manages many individual components, such as the fuel injector. Via various sensors, the ECU makes sure the injector sprays fuel at the right time and in the right amount so the correct air/fuel mixture is created.
How to check if fuel pump fuse is intact?
Turn the key to the “on“ position, reach inside the airflow meter, and gently push the flap open. The fuel pump should click on, accompanied by the sound of fuel rushing through the fuel rail. If this does not happen, check the fuel pump fuse. If the fuse is intact, the culprit is most likely the combi-relay.