how to fix P0174 code on Toyota Highlander XU70 (2020-Present)?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal.
• Allow the engine to cool down completely.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers
• Visually inspect the air intake ducting for cracks or loose connections.
• Tighten any loose clamps or replace damaged hoses.
• If necessary, replace any damaged gaskets or intake components.

3. Check and Clean MAF Sensor

• Tools Required: MAF sensor cleaner
• Disconnect the MAF sensor electrical connector.
• Remove the MAF sensor from the intake tube.
• Spray the MAF sensor with MAF sensor cleaner and allow it to dry completely before reinstalling.

4. Fuel Pressure Check

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the Schrader valve on the fuel rail.
• Turn the ignition to the "On" position (do not start the engine) and check the pressure reading.
• If the pressure is low, inspect the fuel pump, fuel filter, and fuel lines for issues.

5. Vacuum Leak Inspection

• Tools Required: Smoke machine (optional)
• Use a smoke machine to introduce smoke into the intake system to identify leaks.
• Alternatively, visually check all vacuum lines and replace any cracked or damaged hoses.

6. Inspect and Test Fuel Injectors

• Tools Required: Multimeter, fuel injector cleaner
• Use a multimeter to test the resistance of each fuel injector according to specifications.
• Clean the fuel injectors with a professional-grade cleaner if they are clogged.