how to troubleshoot the P0174 code in Honda Pilot YF3 (2016-2022)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to avoid electrical shorts.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect the air intake hoses and connections for any cracks or disconnections.
  2. Use a smoke machine to test for vacuum leaks in the intake system.
  3. Replace any damaged hoses or clamps as necessary.
  4. Reconnect all air intake components securely.

3. Fuel System Check

• Sub-steps:
  1. Attach a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the engine to check initial fuel pressure.
  3. Start the engine and observe the fuel pressure readings; they should be within manufacturer specifications (typically around 40-50 psi).
  4. If pressure is low, inspect the fuel pump and filter for clogs or failures, replacing as necessary.

4. Cleaning or Replacing MAF Sensor

• Sub-steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the MAF sensor from the intake duct (usually requires a Torx or Phillips screwdriver).
  3. Clean the MAF sensor with MAF cleaner spray; allow it to dry completely before reinstalling.
  4. If cleaning does not resolve the issue, replace the MAF sensor with a new one.

5. Oxygen Sensor Inspection

• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors on bank 2.
  2. Disconnect the electrical connectors and inspect for corrosion or damage.
  3. Use a multimeter to test the sensors; replace any faulty sensors.

6. ECT Sensor Check

• Sub-steps:
  1. Locate the ECT sensor and disconnect its electrical connector.
  2. Use a multimeter to check the resistance of the sensor at various temperatures.
  3. Replace the ECT sensor if it does not provide accurate readings.