how to fix my Toyota Highlander XU70 (2020-Present) that keeps stalling

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface, and the engine is off.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Gather all necessary tools and parts.

2. Fuel System Inspection

• Step 1: Remove the fuel pressure gauge from its packaging.
• Step 2: Locate the fuel rail and connect the pressure gauge to the Schrader valve.
• Step 3: Turn the ignition to the "ON" position (do not start the engine) and check the gauge reading. It should be within manufacturer specifications (usually around 50-60 PSI).
• Step 4: If pressure is low, proceed to check the fuel pump relay and fuses for continuity, replacing any faulty components.

3. Air Intake Cleaning

• Step 1: Remove the air intake duct connected to the throttle body.
• Step 2: Inspect and clean the air filter; replace it if it is clogged or dirty.
• Step 3: Use throttle body cleaner and a soft cloth to clean the throttle body, ensuring the butterfly valve operates smoothly.
• Step 4: Reinstall the air intake duct and secure all clamps.

4. Ignition System Check

• Step 1: Remove the spark plug wires or ignition coil connectors.
• Step 2: Remove the spark plugs using a socket wrench and inspect for wear or fouling. Replace them if they are worn beyond specifications.
• Step 3: Test the ignition coils using a multimeter; replace any coils that do not meet resistance specifications.

5. Reassembly and Testing

• Step 1: Reconnect the battery terminal securely.
• Step 2: Start the engine and let it idle, checking for any unusual noises or performance issues.
• Step 3: Perform a test drive to ensure that the stalling issue has been resolved.