What is the function of the fuel pump relay?
So, the primary function of the fuel pump relay is, to maintain a consistent voltage supply, to the fuel pump. Consequently, the fuel pump relay is usually controlled by, the ignition or powertrain control module (PCM).
How to test a suspect fuel pump relay?
1 The easiest way to test a suspect fuel pump relay is to; swap the suspect relay with a good one. 2 You may find another relay in your car with the same configuration as your fuel pump relay. Just make sure the other relay has the same configuration. 3 Remove the suspect relay and install the good relay and check if your engine fires up. …
How does the EEC power relay work in a car?
The EEC Power Relay not only supplies battery voltage to the fuel injection computer (also known as the E.E.C. Electronic Control Assembly), but also supplies power to the fuel injectors, the fuel pump relay, and a few other emissions related solenoids. The EEC Power Relay is easy to recognize…
What should the voltage be on a fuel injector?
The wiring harness will have two terminals that the prongs on the injector insert into. One will be connected to ground and will read 0 volts. The other should read around 12 volts. Step 5: Repeat with all injector wiring harnesses. Leave the ground lead in position and test all of your injector wiring harnesses. They should all be around 12 volts.
How does the EEC relay in a fuel pump work?
Relay Basics: How The EEC Power Relay Works. This is the circuit that delivers the voltage (and thus current) to the Fuel Injection Computer (EEC Electronic Control Assembly), fuel injectors, fuel pump relay, etc. When the relay is not activated, this circuit is ‘open’, and as such, does not send any power to anything.
What are the numbers on the fuel pump relay?
A high current circuit. This circuit can be identified by the wires labeled with the numbers 3 and 4. This is the circuit that delivers the voltage (and thus current) to the fuel injection computer (EEC Electronic Control Assembly), fuel injectors, fuel pump relay, etc.
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.
Where is the main power relay on a Bosch fuel pump?
Cut the wire and tape it off going into the harness. Now, locate the main power relay next to the ECU. It has a large gauge red main power wire going into it. Take the wire from the #10 pin on the ECU and attach it to connector #87 on the main power relay. This provides more voltage to the starting circuit. Fuel Pump Power.