how to fix P0174 code on Honda Accord 9th Generation (2013-2017)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the vehicle is on a flat surface and secure it with wheel chocks.

2. Inspect and Repair Vacuum Leaks

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

3. Clean or Replace the Mass Airflow Sensor

• Sub-steps:
  1. Locate the MAF sensor along the intake duct.
  2. Disconnect the electrical connector and remove the sensor.
  3. Clean the sensor with MAF cleaner spray; do not touch the sensor element.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel System

• Sub-steps:
  1. Use a fuel pressure gauge to check the fuel pressure at the fuel rail; it should typically be between 40-50 PSI.
  2. If pressure is low, check the fuel pump and fuel filter for function and replace if necessary.
  3. Inspect fuel injectors for clogs and ensure proper operation; clean or replace as needed.

5. Verify Engine Coolant Temperature Sensor

• Sub-steps:
  1. Locate the ECT sensor and disconnect it.
  2. Use a multimeter to measure resistance and compare it to the specifications in the service manual.
  3. Replace the ECT sensor if it is out of specification.

6. Reassemble and Test

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Start the engine and allow it to idle for a few minutes to check for irregularities.
  3. Clear the fault codes using the OBD-II scanner and take the vehicle for a test drive.

Tools Required:

• OBD-II scanner
• Multimeter
• Fuel pressure gauge
• Vacuum gauge
• MAF cleaner spray
• Socket set
• Screwdriver set

Parts Required:

• Vacuum hoses (if damaged)
• MAF sensor (if cleaning does not resolve the issue)
• Fuel filter (if pressure is low)
• Fuel injectors (if they are clogged or malfunctioning)
• Engine coolant temperature sensor (if faulty)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect the battery before working on electrical components.
• Allow the engine to cool down before inspecting the intake manifold or cooling system.