Introduction
The Saturn is a popular car brand that has been in existence since the early 1980s. One of the key components of the Saturn’s fuel system is the fuel pump relay. This relay is responsible for controlling the fuel pump and ensuring that the engine receives the fuel it needs to run smoothly. In this article, we will discuss the wiring diagram for the Saturn fuel pump relay, as well as some frequently asked questions about this important component.
Wiring Diagram
The wiring diagram for the Saturn fuel pump relay is fairly straightforward. The relay itself is located in the engine compartment, usually near the battery or the fuse box. The wiring for the relay consists of four wires:
| Wire Color | Function |
|---|---|
| Dark Green/White | Power to relay from fuse box |
| Black/White | Ground |
| Gray | Power to fuel pump when relay is energized |
| Tan | Control wire from PCM (Powertrain Control Module) |
The relay itself is a standard 4-pin relay, with pins 30, 87, 85, and 86. Pin 30 is connected to the dark green/white wire, pin 87 is connected to the gray wire, pin 85 is connected to ground (black/white wire), and pin 86 is connected to the tan wire.
If you need to replace the fuel pump relay, it is important to follow the wiring diagram carefully to ensure that the new relay is wired correctly.
Testing the Relay
If you suspect that the fuel pump relay is faulty, you can test it using a multimeter. Here’s how:
- Disconnect the fuel pump relay from its connector.
- Set your multimeter to the ohms scale.
- Using the multimeter probes, measure the resistance between pins 85 and 86. You should see a reading of between 70 and 100 ohms.
- Now measure the resistance between pins 30 and 87. You should see a reading of 0 ohms (continuity).
- If you see any readings outside of these parameters, the fuel pump relay is faulty and should be replaced.
FAQ
What does the fuel pump relay do?
The fuel pump relay is responsible for controlling the fuel pump in the Saturn’s fuel system. When the relay is energized (usually by the PCM), power is sent to the fuel pump, allowing it to deliver fuel to the engine.
How do I know if my fuel pump relay is faulty?
If your Saturn is experiencing difficulty starting or running, it could be a sign of a faulty fuel pump relay. Other symptoms include intermittent starting or stalling, as well as a loss of power while driving.
Can I replace the fuel pump relay myself?
Yes, replacing the fuel pump relay is a relatively simple process. However, it is important to follow the wiring diagram carefully to ensure that the new relay is wired correctly.
How much does it cost to replace a fuel pump relay?
The cost of replacing a fuel pump relay will vary depending on the make and model of your Saturn, as well as where you live. In general, you can expect to pay anywhere from $20 to $200 for a new relay, plus the cost of labor if you have it replaced by a mechanic.
Can a faulty fuel pump relay cause other problems?
Yes, if the fuel pump relay is faulty, it can cause a variety of problems with your Saturn’s fuel system. This can lead to poor engine performance, decreased fuel economy, and even engine damage if the problem is not addressed.
Conclusion
The fuel pump relay is an essential component of the Saturn’s fuel system, responsible for controlling the fuel pump and ensuring that the engine receives the fuel it needs to run smoothly. If you suspect that your relay is faulty, it is important to have it replaced as soon as possible to avoid further damage to your engine. By following the wiring diagram carefully and conducting regular testing, you can ensure that your Saturn’s fuel system is functioning properly.
