how to fix the P0174 code in my Toyota RAV4 Fourth Generation (2013-2018)?

Solution

1. Preparation

• Gather the necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Air Intake System

• Inspect all hoses and connections:
  • Visually check for cracks or disconnections in the air intake hoses.
  • Use a smoke machine or soapy water to find leaks if necessary.
• Repair or replace damaged components:
  • Replace any cracked hoses or faulty clamps.
  • Ensure all connections are tight and secure.

3. Fuel Pressure Check

• Connect a fuel pressure gauge:
  • Locate the fuel rail pressure test port.
  • Attach the gauge according to the manufacturer’s instructions.
• Check fuel pressure:
  • Turn the ignition to the "ON" position without starting the engine to prime the fuel system.
  • Record the pressure and compare it with the manufacturer’s specifications.
• Replace the fuel pump or filter if pressure is low.

4. Clean or Replace the MAF Sensor

• Remove the MAF sensor:
  • Disconnect the electrical connector.
  • Unscrew the sensor from the air intake duct.
• Clean the sensor:
  • Use MAF sensor cleaner and follow the manufacturer's instructions.
• Reinstall or replace the MAF sensor if damaged.

5. Inspect Vacuum Lines

• Check all vacuum lines:
  • Inspect for any signs of wear or damage.
  • Use a vacuum gauge to test for leaks if necessary.
• Replace any damaged vacuum lines.

6. Inspect Fuel Injectors

• Check for clogs:
  • Remove the fuel injectors and inspect them for debris.
  • Use a fuel injector cleaning kit if necessary.
• Replace faulty injectors if leaks are observed.