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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery cable to prevent electrical shorts and ensure safety.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses and connections for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner around the intake manifold and vacuum lines to locate any leaks.
  3. Replace any damaged hoses or gaskets found during inspection.

3. Check and Clean the MAF Sensor

• Tools Required: MAF sensor cleaner or electrical contact cleaner
• Sub-steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the MAF sensor from the air intake duct.
  3. Spray the MAF sensor with the cleaner and allow it to dry completely before reinstalling.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Test and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition to the "ON" position without starting the engine and check the fuel pressure.
  3. If the pressure is below specifications, check the fuel pump and filter for issues. Replace as necessary.

5. Inspect Fuel Injectors

• Tools Required: Fuel injector cleaning kit (if needed)
• Sub-steps:
  1. Remove the fuel injectors from the fuel rail.
  2. Inspect injectors for clogs or leaks.
  3. Clean or replace the injectors as required.
  4. Reinstall injectors and reconnect the fuel rail.