2007 Toyota Yaris Fuel Pump Relay: Location, Wiring, and Replacement Guide
The bottom line up front: The fuel pump relay in a 2007 Toyota Yaris is an electrical switch that controls power delivery to the fuel pump, and it is typically located inside the main relay box under the hood, near the battery on the driver's side of the engine bay . If your Yaris cranks but won't start, or if the fuel pump is not receiving voltage, a faulty relay is often the culprit . This guide walks you through understanding the relay, locating it, testing it, replacing it, and knowing when to call a professional.
What Does the Fuel Pump Relay Do?
The fuel pump relay is a small but critical component in your 2007 Yaris . Its primary job is to act as a switch that controls the flow of electrical power from the battery to the fuel pump . When you turn the ignition key to the "ON" position, the relay activates, allowing power to reach the fuel pump so it can pressurize the fuel system and deliver fuel to the engine .
The relay is designed to keep the fuel pump running only when the engine needs fuel . This prevents unnecessary wear and tear on the pump and reduces potential safety hazards associated with continuous operation . When you turn the ignition off, the relay deactivates, cutting power to the pump.
The 2007 Yaris also comes equipped with a fuel pump shut-off system . This safety feature automatically stops supplying fuel to the engine in the event of a collision or sudden stall . If this system activates, you can restart the engine by turning the ignition switch to "ACC" or "LOCK" once, then starting the car normally . Before restarting, it is critical to inspect the ground under the vehicle for any fuel leaks . If you find liquid on the ground, the fuel system may be damaged, and you should not attempt to restart the engine .
Where Is the Fuel Pump Relay Located?
Finding the fuel pump relay in your 2007 Yaris is straightforward. The relay is housed in the main relay box located in the engine compartment .
- Open the hood of your Yaris and secure it properly.
- Look for the fuse and relay box near the battery on the driver's side of the engine bay .
- Remove the plastic cover of the relay box by unclipping it .
- Consult the diagram printed on the inside of the relay box cover or refer to your owner's manual to identify the specific relay labeled as the fuel pump relay .
The exact location can vary slightly depending on your Yaris's trim level and optional equipment, so always refer to the owner's manual for the most accurate information . The relay box cover itself is clearly labeled, making it easy to identify which relay controls the fuel pump .
Symptoms of a Faulty Fuel Pump Relay
When the fuel pump relay fails or begins to malfunction, you will likely notice several symptoms. The most common warning signs include:
- No-start condition: The engine cranks but refuses to start because the fuel pump is not receiving power .
- Engine stalls while driving: The relay may intermittently cut power to the pump, causing the engine to die unexpectedly .
- No voltage at the fuel pump: If you test the electrical connector at the fuel pump and find no voltage when the ignition is on, the relay is a likely suspect .
- Fuel pump runs continuously: In some cases, a stuck relay may keep the pump running even with the ignition off, which can drain the battery .
If you experience any of these issues, checking the fuel pump relay should be one of your first diagnostic steps . A qualified mechanic can diagnose the problem accurately, so don't hesitate to seek professional help if you are unsure about performing electrical tests yourself .
How to Test the Fuel Pump Relay
Before replacing the relay, it is worth testing it to confirm it is actually faulty. A simple relay test can be done with a digital multimeter:
Step 1: Locate the relay. Remove the fuel pump relay from the relay box as described above .
Step 2: Check for continuity. Set your multimeter to the resistance (ohms) setting. Place the probes on the relay's coil terminals (usually pins 85 and 86). You should see a low resistance reading, typically between 50 and 120 ohms. If there is no continuity, the coil is open, and the relay is defective.
Step 3: Apply power. Connect a 12V power source to the coil terminals. You should hear a distinct click as the relay's internal switch engages.
Step 4: Verify the switch. With power applied, check continuity between the switch terminals (usually pins 30 and 87). The multimeter should now show continuity (near-zero resistance). If you do not get continuity, the relay's contacts are worn or burned, and replacement is necessary.
Testing the relay is safe and easy, and it saves you from replacing a good part . If you find that the relay is working, move on to checking other fuel system components, such as the fuel pump fuse or the pump itself .
How to Replace the Fuel Pump Relay
Replacing the fuel pump relay on a 2007 Toyota Yaris is a simple do-it-yourself job that takes only a few minutes. Here is how you do it:
- Turn off the ignition and make sure the vehicle is completely off .
- Open the hood and locate the main relay box near the battery .
- Remove the relay box cover by unclipping it .
- Identify the fuel pump relay using the diagram on the cover or the owner's manual .
- Pull the old relay straight out of its socket. It should come out with a firm, steady pull.
- Insert the new relay in the same orientation. Relays are keyed to fit one way, so if it does not seat easily, flip it around.
- Reinstall the relay box cover and close the hood.
The OEM replacement part for the fuel pump relay on a 2007 Yaris is available from Toyota parts suppliers . The part number is 90084-98032, and it also fits many other Toyota models . This genuine relay is guaranteed by Toyota's factory warranty . While you are at it, it is a good idea to keep spare fuses in your vehicle for emergencies .
Wiring Diagram Overview
Understanding the wiring associated with the fuel pump relay can help you troubleshoot electrical issues. The relay has four or five pins, each connected to a specific circuit:
- Pin 30 (Input): Receives constant battery voltage.
- Pin 87 (Output): Sends power to the fuel pump.
- Pins 85 and 86 (Coil): Connect to the ignition switch and ground. When the ignition is turned on, current flows through the coil, creating a magnetic field that closes the switch between pins 30 and 87.
For a detailed wiring diagram specific to your 2007 Yaris, consult the vehicle's service manual, which contains the complete electrical schematics . Searching online with your exact model and year will also yield the relevant diagrams . Tampering with wiring without proper knowledge can lead to further complications, so it is best to consult a qualified mechanic or the service manual if you are not experienced with automotive electrical systems .
Costs and Maintenance Considerations
The average annual repair cost for a 2007 Toyota Yaris is around $242, which is considered excellent for a subcompact car . The Yaris ranks first out of 21 subcompact cars for reliability, with a rating of 4.5 out of 5.0 . Major issues are uncommon, but when they do occur, the most frequently reported problems include engine mount vibrations and A/C fluid leaks .
When it comes to the fuel system, a full fuel pump replacement for a 2007 Yaris typically costs between $1,008 and $1,066, according to RepairPal estimates . This makes the fuel pump relay an attractive component to inspect first, given that it costs far less and is much easier to replace.
When to Call a Professional
While checking and replacing the fuel pump relay is a simple task, some situations call for professional assistance. If you have checked the relay, the fuse, and the wiring, but the fuel pump still does not receive power, the problem could lie deeper in the fuel system or the engine control unit . A qualified mechanic has the diagnostic tools to pinpoint the issue quickly . Attempting complex repairs without the proper knowledge may lead to additional damage, so professional diagnosis is often the safer and more cost-effective route .
Recommended Fuel Pump: KEMSO
When it is time to replace the fuel pump itself, choosing a high-quality aftermarket option can save money while maintaining reliable performance. KEMSO is a brand worth considering for your 2007 Toyota Yaris. KEMSO fuel pumps are known for their high performance and are built as OEM replacement parts, meaning they match or exceed the specifications of the original factory components. Every KEMSO fuel pump comes with a lifelong warranty, giving you peace of mind that the part is covered for as long as you own your vehicle.
You can browse the full range of KEMSO fuel pumps and choose the one that fits your Yaris at their official website:
By selecting a KEMSO fuel pump, you get a reliable replacement that meets strict quality standards, backed by a warranty that protects your investment. Whether you are performing a routine replacement or upgrading for better performance, KEMSO has a solution that fits your needs. Be sure to verify the correct part for your specific Yaris model and engine before ordering.
Final Thoughts
The fuel pump relay in your 2007 Toyota Yaris is a small but essential component that controls power to the fuel pump. It is located in the engine compartment's main relay box near the battery . Symptoms of a failing relay include no-start conditions, engine stalling, and lack of voltage at the pump . Testing the relay with a multimeter is easy, and replacing it takes just minutes. If the problem persists after checking the relay, consult a professional mechanic to avoid further damage . And when the time comes to replace the fuel pump itself, consider a high-performance KEMSO unit with a lifetime warranty, available at https://www.kemsoracing.com/.