how to fix P0174 code on my Toyota Tacoma N300 (2016-Present)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool down if it has been running.

2. Inspect for Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps
• Sub-steps:
  1. Visually inspect all vacuum lines and connections for cracks or disconnections.
  2. Use a vacuum gauge to check for proper vacuum levels; any significant deviation indicates a leak.
  3. If a leak is found, replace the affected hose or gasket.

3. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel pressure test port on the fuel rail.
  2. Connect the fuel pressure gauge and turn the ignition to the ON position without starting the engine.
  3. Observe the pressure reading; it should meet manufacturer specifications (usually between 50-60 psi).
  4. If pressure is low, inspect the fuel pump and filter for issues.

4. Clean or Replace MAF Sensor

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

5. Inspect Fuel Injectors

• Tools Required: Multimeter (for testing), injector cleaner (if necessary)
• Sub-steps:
  1. Remove the fuel injectors from the fuel rail.
  2. Use a multimeter to check the resistance of each injector; compare with specifications.
  3. Clean the injectors using an appropriate injector cleaner if clogged.
  4. Reinstall the injectors ensuring proper sealing.

6. Replace ECT Sensor (if necessary)

• Tools Required: Socket set
• Sub-steps:
  1. Locate the engine coolant temperature sensor.
  2. Disconnect the electrical connector and remove the sensor.
  3. Install the new sensor and reconnect the connector.
  4. Refill coolant if necessary to prevent overheating.