my Toyota Highlander XU70 (2020-Present) feels sluggish when driving, why

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the engine is off.
• Gather necessary tools and parts.

2. Clean or Replace Air Filter

• Remove the air filter cover using a screwdriver (if applicable).
• Take out the air filter and inspect it for dirt and damage.
• Clean the filter with compressed air or replace it with a new one.
• Reinstall the air filter and cover, ensuring it is secured properly.

3. Inspect and Clean Throttle Body

• Disconnect the negative battery terminal to prevent electrical issues.
• Locate the throttle body and remove the intake ducting.
• Use throttle body cleaner and a soft cloth to clean the interior of the throttle body.
• Ensure the throttle plate moves freely and is not sticking.
• Reassemble the intake ducting and reconnect the battery terminal.

4. Fuel System Inspection

• Use a fuel pressure gauge to test fuel pressure at the fuel rail.
• If pressure is low, inspect fuel pump and fuel filter for clogs or failures.
• Replace the fuel filter if it is dirty or clogged.
• If the fuel pump is faulty, replace it according to manufacturer specifications.

5. Battery and Charging System Check

• Use a multimeter to check the battery voltage; it should be around 12.6 volts with the engine off.
• Start the engine and check voltage again; it should be between 13.7 to 14.7 volts.
• If the battery or alternator is not functioning properly, replace them as needed.