how to troubleshoot my Toyota Highlander XU70 (2020-Present) fuel pump not working

Toyota Highlander XU70 (2020-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

534 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to troubleshoot and fix fuel pump issues in the 2020-present Toyota Highlander XU70. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Fuel System

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems.
•Allow the fuel system to depressurize before removing components.

Symptoms

•Engine cranks but does not start
•No sound from the fuel pump when the ignition is turned on
•Check engine light illuminated
•Poor engine performance or stalling after starting
•Fuel gauge may not function correctly
•Fuel odor near the vehicle

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any related trouble codes.
2
Verify the fuel pump relay operation by checking for continuity and proper function.
3
Inspect the fuel pump fuse to ensure it is not blown or damaged.
4
Use a multimeter to check for power at the fuel pump connector with the ignition in the 'ON' position.
5
Check the fuel lines for blockages or leaks that could affect fuel delivery.
6
Perform a fuel pressure test to determine if the pump is supplying adequate pressure.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Multimeter
•Socket set
•Fuel pressure gauge
•Safety glasses

Parts Required

•Fuel pump (if replacement is necessary)
•Fuel pump relay (if faulty)
•Fuel pump fuse (if blown)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any related trouble codes.
2
Verify the fuel pump relay operation by checking for continuity and proper function.
3
Inspect the fuel pump fuse to ensure it is not blown or damaged.
4
Use a multimeter to check for power at the fuel pump connector with the ignition in the 'ON' position.
5
Check the fuel lines for blockages or leaks that could affect fuel delivery.
6
Perform a fuel pressure test to determine if the pump is supplying adequate pressure.

Solution

1. Preparation

Gather tools: OBD-II scanner, multimeter, socket set, fuel pressure gauge, safety glasses.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the negative battery terminal to avoid electrical shorts.

2. Access the Fuel Pump

Remove the rear seat or access panel (depending on vehicle configuration) to reach the fuel pump assembly.
If necessary, disconnect any electrical connectors or hoses connected to the assembly.

3. Inspect and Test Components

Check the fuel pump relay for continuity using a multimeter; replace if faulty.
Inspect the fuel pump fuse; replace it if blown.
Test the fuel pump connector for power with the multimeter; if no power is detected, trace the wiring back to the relay and fuse.

4. Replace the Fuel Pump (if necessary)

If the pump is determined to be faulty, remove the retaining ring or bolts securing the pump assembly.
Carefully lift the fuel pump assembly out of the tank, noting the orientation and any attached components.
Install the new pump by reversing the removal steps, ensuring all connections are secure.

5. Reassemble and Test

Reconnect the battery terminal and start the engine to verify proper operation.
Check for fuel leaks around the pump assembly and listen for the pump operation.