how to fix P0174 code in Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Multimeter
• Fuel pressure gauge
• Vacuum gauge

2. Inspect Air Intake System

• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold for cracks or leaks.
  2. Remove the air filter housing to access the intake duct.
  3. Check for any signs of damage or loose connections.
  4. Replace any damaged hoses or components.

3. Check MAF Sensor

• Sub-steps:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the MAF sensor from the intake duct.
  3. Clean the sensor with MAF cleaner, ensuring no residue is left.
  4. Reinstall the sensor and reconnect the electrical connector.

4. Test Fuel Pressure

• Sub-steps:
  1. Attach the fuel pressure gauge to the fuel rail service port.
  2. Turn the ignition to the "ON" position without starting the engine to prime the fuel system.
  3. Read the pressure; it should match the specifications found in the service manual (typically around 50-60 psi).
  4. If the pressure is low, check the fuel pump and filter for issues and replace as necessary.

5. Inspect Fuel Injectors

• Sub-steps:
  1. Remove the fuel rail to access the fuel injectors.
  2. Inspect each injector for clogs or leaks.
  3. Use a multimeter to check the resistance of the injectors; compare to specifications.
  4. Clean or replace any faulty injectors.

6. Check PCV System

• Sub-steps:
  1. Locate the PCV valve and disconnect it.
  2. Inspect the valve for proper operation by shaking it; it should rattle.
  3. Replace the PCV valve if it is clogged or sticking.
  4. Check the PCV hose for blockages and replace if necessary.