why does my Toyota Highlander Third Generation (2014-2019) have a delayed throttle response

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical issues.

2. Inspect and Replace Throttle Position Sensor (TPS)

• Remove the air intake duct to access the throttle body.
• Disconnect the electrical connector from the TPS.
• Using a multimeter, test the TPS for proper resistance values following the manufacturer's specifications.
• If faulty, remove the screws securing the TPS and take out the sensor.
• Install the new TPS in reverse order, ensuring it is secured properly.
• Reconnect the electrical connector.

3. Inspect and Replace Accelerator Pedal Position Sensor

• Disconnect the negative battery terminal again if it was reconnected.
• Remove the accelerator pedal assembly from its mounting points.
• Disconnect the electrical connector from the accelerator pedal position sensor.
• Test the sensor with a multimeter for correct readings.
• Replace the sensor if it fails the test.
• Reassemble the pedal assembly and reconnect the battery.

4. Check for Vacuum Leaks

• Visually inspect all hoses connected to the intake manifold for cracks or wear.
• Use a smoke machine to introduce smoke into the intake system and observe for leaks.
• Replace any damaged hoses or intake gaskets as necessary.

5. Fuel System Check

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition to the "on" position without starting to check for proper fuel pressure.
• Start the engine and monitor the pressure; it should remain steady as specified by the manufacturer.
• If pressure is low, consider replacing the fuel pump or filter.