why does my Toyota Highlander XU70 (2020-Present) stall at stoplights

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Clean Throttle Body

• Tools Required: Throttle body cleaner, soft cloth, socket set.
• Remove the air intake duct to access the throttle body.
• Spray throttle body cleaner onto the throttle plate and wipe clean with a soft cloth.
• Ensure the throttle plate operates smoothly without sticking.
• Reinstall the air intake duct securely.

3. Check and Clean or Replace Fuel Filter

• Tools Required: Fuel line disconnect tool, socket set, rags.
• Relieve fuel system pressure by removing the fuel pump fuse and running the engine until it stalls.
• Disconnect the fuel lines from the filter using the fuel line disconnect tool.
• Remove the old fuel filter and install a new one, ensuring correct orientation.
• Reconnect fuel lines and replace the fuel pump fuse.

4. Inspect Battery and Charging System

• Tools Required: Multimeter.
• Use a multimeter to check battery voltage (should be around 12.6 volts at rest).
• Start the engine and check voltage again (should be around 13.7-14.7 volts).
• If voltage is low, replace the battery or repair the charging system.

5. Reprogram ECM (if necessary)

• Tools Required: OBD-II scanner with programming capabilities.
• Follow the manufacturer's instructions to check for any software updates.
• If updates are available, perform the reprogramming as prescribed.