how to fix the fuel gauge not working in Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to ensure safety during the repair.

2. Inspect Fuel Sending Unit

• Tools Required: Socket set, screwdrivers
• Locate the fuel tank access panel (if available) or lift the vehicle to access the fuel tank.
• Remove any necessary covers or components to reach the fuel sending unit.
• Disconnect the electrical connector from the sending unit.
• Remove the sending unit from the tank (usually requires unscrewing it).
• Inspect the float arm for any obstructions or damage.

3. Test Fuel Gauge

• Tools Required: Multimeter
• Reconnect the electrical connector to the sending unit (if it was disconnected).
• Measure the resistance across the sending unit terminals while moving the float arm from empty to full.
• Compare the readings to manufacturer specifications (typically between 0-90 ohms).
• If the readings are outside of specification, replace the sending unit.

4. Check Wiring and Connectors

• Tools Required: Wire strippers, electrical tape
• Inspect the wiring harness for any frays, breaks, or corrosion.
• Repair or replace any damaged wires.
• Ensure all connectors are clean and secure; use electrical contact cleaner if necessary.

5. Reassemble and Test

• Reinstall the fuel sending unit and secure it properly.
• Reconnect any covers or components removed during disassembly.
• Reconnect the vehicle battery.
• Start the vehicle and check the fuel gauge for proper operation.