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How do I fix a malfunctioning fuel pump relay in a 2020 Toyota Highlander? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/How do I fix a malfunctioning fuel pump relay in a 2020 Toyota Highlander?

How do I fix a malfunctioning fuel pump relay in a 2020 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
1-2 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
3 min read
557 words

Problem Statement

Learn how to diagnose and replace a faulty fuel pump relay in a 2020 Toyota Highlander with detailed steps and required tools.

Affected Component
fuel pump relay
Estimated Time
1-2 hours

Symptoms

  • •Engine Cranks but Does Not Start
  • •Intermittent Stalling
  • •No Sound from Fuel Pump
  • •Check Engine Light

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5

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
  • •Jumper Wire
  • •Basic hand tools (screwdriver, pliers)
  • •Replacement fuel pump relay (if faulty)

Additional Information

Affected Component
fuel pump relay
Estimated Time
1-2 hours
Difficulty
medium
Severity
medium
Tools Required
5 items

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Back to Generation

Fixing a Malfunctioning Fuel Pump Relay in a 2020 Toyota Highlander

Step 1: Verify the Symptoms
  • Ensure the symptoms are consistent before proceeding with diagnostics.
  • Check for any stored trouble codes using an OBD-II scanner.
Step 2: Check Fuel Pump Operation
  1. Turn the ignition key to the "ON" position (do not start the engine).
  2. Listen for the fuel pump's whirring sound from the fuel tank. If absent, proceed to check the relay.
Step 3: Inspect the Fuel Pump Relay
  1. Locate the fuel pump relay in the engine compartment fuse box (refer to the owner's manual for exact location).
  2. Visually inspect the relay for any signs of damage (burnt contacts, corrosion).
Step 4: Test the Relay

  1. Tools Required:

    • Multimeter
    • Jumper wire (optional)
    • OBD-II scanner (for checking codes)

  2. Using the Multimeter:

    • Remove the fuel pump relay from the fuse box.
    • Set the multimeter to measure resistance (ohms).
    • Test the relay terminals:
      • Connect the probes to the relay terminals corresponding to the coil and check for continuity.
      • Energize the relay by applying power to the coil terminals and check for continuity between the switch terminals.
    • If the relay fails to show continuity, it is faulty and needs replacement.
Step 5: Check Power to the Relay
  1. With the ignition in the "ON" position, use the multimeter to check for voltage at the relay socket:
    • Test the input terminal of the relay for 12V.
    • If there is no voltage, trace the wiring back to the fuel pump fuse and ignition switch.
Tools Required
  • OBD-II Scanner
  • Multimeter
  • Jumper Wire
  • Basic hand tools (screwdriver, pliers)
  • Replacement fuel pump relay (if faulty)
Repair Instructions
Step 1: Replace the Fuel Pump Relay

  1. Safety Precautions:

    • Disconnect the negative battery terminal to avoid any electrical shorts.

  2. Remove the Faulty Relay:

    • Pull the faulty fuel pump relay out of the fuse box.

  3. Install the New Relay:

    • Insert the new fuel pump relay into the same socket, ensuring it is seated correctly.
Step 2: Reconnect and Test
  1. Reconnect the negative battery terminal.
  2. Turn the ignition to the "ON" position and listen for the fuel pump operation.
  3. Attempt to start the engine.
Step 3: Clear Diagnostic Codes (if applicable)
  • If you found any trouble codes during the diagnostic step, use the OBD-II scanner to clear them.
  • Monitor the vehicle to ensure it operates normally.
Conclusion

A malfunctioning fuel pump relay can lead to fuel delivery issues and prevent the engine from starting. By following these detailed steps, you can diagnose and replace a faulty fuel pump relay in a 2020 Toyota Highlander. If issues persist after replacement, further investigation into the wiring or fuel pump itself may be necessary.