my Toyota Highlander XU70 (2020-Present) won't accelerate past 40 mph what's wrong

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Make sure the vehicle is parked on a level surface and secured with wheel chocks.

2. Inspect and Clean the Throttle Body

• Remove the intake duct connected to the throttle body.
• Use throttle body cleaner and a soft cloth to clean the throttle plate and surrounding area.
• Ensure the throttle plate opens and closes freely without obstruction.
• Reattach the intake duct securely.

3. Check Transmission Fluid

• Locate the transmission dipstick, remove it, and wipe it clean.
• Reinsert the dipstick and remove it again to check the fluid level.
• If low, add the appropriate transmission fluid as specified in the owner’s manual.
• If the fluid is dirty or burnt, consider a transmission fluid change.

4. Test Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail’s test port.
• Turn the ignition to the "on" position (without starting the engine) to check the fuel pressure.
• Compare the reading to the manufacturer's specifications. If pressure is low, inspect the fuel pump and filter.

5. Inspect and Test the MAF Sensor

• Disconnect the MAF sensor connector.
• Remove the MAF sensor from the air intake system.
• Clean the sensor with MAF cleaner; avoid touching the sensor element.
• Reinstall the sensor and reconnect the connector.