what does it mean when the check engine light flashes on my Toyota Corolla E170 (2013-2019)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, compression tester.
• Safety Warnings: Disconnect the battery before starting work on electrical systems. Ensure the engine is cool before beginning any inspection.

2. Retrieve and Analyze Codes

• Use the OBD-II scanner to check for stored trouble codes.
• Document any codes found, focusing on misfire-related codes (e.g., P0300-P0304).

3. Inspect Ignition System

• Spark Plug Replacement:

  • Remove the ignition coil cover and ignition coils.
  • Extract the spark plugs using a spark plug socket.
  • Inspect and replace worn or damaged spark plugs with OEM recommended types (typically NGK or Denso).
  • Reinstall the ignition coils and cover, ensuring they are secured properly.

• Ignition Coil Testing:

  • Use a multimeter to measure resistance across the ignition coils.
  • Replace any coils that are out of specification.

4. Check Fuel System

• Fuel Injector Inspection:
  • Visually inspect fuel injectors for leaks or blockages.
  • Use a fuel pressure gauge to ensure proper fuel pressure is within specifications (usually around 50-60 psi).
  • Clean or replace fuel injectors if necessary.

5. Verify Air Intake and Vacuum System

• Inspect the intake manifold and hoses for cracks or loose connections.
• Use a smoke machine to check for vacuum leaks; repair any leaks found.

6. Conduct Compression Test

• Remove all spark plugs for access.
• Insert the compression tester into each cylinder and crank the engine.
• Record the compression readings for each cylinder. Values should generally be above 150 psi, with minimal variance between cylinders.

7. Reassemble and Clear Codes

• Reinstall all components and reconnect the battery.
• Use the OBD-II scanner to clear any stored trouble codes.