how to fix P0174 code on Toyota RAV4 Fourth Generation (2013-2018)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety while working on the electrical components.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamp pliers
• Instructions:
  1. Use a vacuum gauge to check for vacuum leaks in the intake system.
  2. Listen for hissing sounds around the intake manifold and vacuum hoses.
  3. Replace any damaged hoses or gaskets as necessary.

3. Clean the Mass Air Flow (MAF) Sensor

• Tools Required: MAF sensor cleaner, soft cloth
• Instructions:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector from the MAF sensor.
  3. Remove the MAF sensor from the duct.
  4. Spray the MAF sensor with MAF cleaner and allow it to dry completely.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Verify Fuel Pressure

• Tools Required: Fuel pressure gauge
• Instructions:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the engine to check the fuel pressure.
  3. Compare the reading with the manufacturer’s specifications (typically between 50-60 psi).
  4. If the pressure is low, replace the fuel pump or filter as needed.

5. Inspect Fuel Injectors

• Tools Required: Fuel injector cleaning kit (if necessary), multimeter
• Instructions:
  1. Disconnect the fuel injectors' electrical connectors.
  2. Use a multimeter to check the resistance of each injector; compare with manufacturer specifications.
  3. If any injectors are faulty, replace them.
  4. If injectors are clogged, consider cleaning them using a fuel injector cleaning kit.