how to fix P0174 code in Toyota Tacoma N300 (2016-Present)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  • Use a smoke machine or propane enrichment test to locate any hidden leaks.
  • Replace any damaged hoses or fittings as necessary.

3. Check and Clean the MAF Sensor

• Sub-steps:
  • Locate the MAF sensor on the air intake duct.
  • Remove the electrical connector by pressing on the tab and pulling it off.
  • Unscrew the MAF sensor from the intake duct.
  • Spray MAF cleaner on the sensor elements and allow it to dry completely before reinstallation.
  • Reinstall the MAF sensor and reconnect the electrical connector.

4. Test Fuel Pressure

• Sub-steps:
  • Attach a fuel pressure gauge to the fuel rail service port.
  • Turn the ignition to the "ON" position (do not start the engine) and check the pressure reading against manufacturer specifications (should be around 50-60 psi).
  • If the pressure is low, inspect the fuel pump and replace if necessary.

5. Inspect and Clean Fuel Injectors

• Sub-steps:
  • Remove the fuel rail assembly to access the fuel injectors.
  • Inspect each injector for cracks or leaks.
  • Use a fuel injector cleaning kit to clean the injectors if they are clogged.
  • Reinstall the fuel rail and ensure all connections are secure.

6. Replace Oxygen Sensors (if necessary)

• Sub-steps:
  • Identify the downstream oxygen sensor for Bank 2.
  • Disconnect the sensor's electrical connector and use an oxygen sensor socket to remove it.
  • Install the new oxygen sensor and reconnect the electrical connector.