how to resolve P0174 code in my Toyota RAV4 Fourth Generation (2013-2018)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool down.

2. Inspect Air Intake System

• Remove the air intake duct connecting to the throttle body.
• Check for any visible cracks or loose fittings.
• Clean the MAF sensor using MAF cleaner if it appears dirty.
• Reinstall the air intake duct securely.

3. Check Fuel Pressure

• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position without starting the engine to check the pressure.
• Compare the reading with manufacturer specifications (typically 30-40 psi for RAV4).
• If the pressure is low, inspect the fuel pump and fuel filter for issues.

4. Inspect Vacuum Lines

• Visually inspect all vacuum lines for signs of wear, cracking, or disconnection.
• Use a smoke machine or carburetor cleaner to identify any vacuum leaks.
• Replace any damaged or leaking vacuum hoses.

5. Examine Fuel Injectors

• Remove the fuel injectors from the fuel rail.
• Check for clogs or debris in the injector nozzles.
• Clean the injectors using a specialized injector cleaning kit if necessary.
• Reinstall the injectors ensuring proper seals.

6. Clear Codes and Test Drive

• Reconnect the battery terminal.
• Use the OBD-II scanner to clear the P0174 code.
• Start the engine and perform a test drive to ensure the issue is resolved.