why is my Toyota Corolla E210 (2019-2024) check engine light flashing?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, fuel pressure gauge.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect Spark Plugs

• Remove the spark plug cover using a socket set.
• Carefully remove each spark plug using a spark plug socket.
• Inspect each spark plug for signs of wear, carbon buildup, or damage.
• Replace any faulty spark plugs with new ones, ensuring the correct torque (usually 13-15 lb-ft).

3. Check Ignition Coils

• Remove the ignition coils by unbolting them from the cylinder head.
• Inspect each ignition coil for cracks or damage.
• Use a multimeter to test the resistance of each coil (specifications typically range from 0.4-0.6 ohms for primary resistance).
• Replace any faulty ignition coils.

4. Inspect Fuel Injectors

• Remove the fuel rail, taking care to relieve fuel pressure first.
• Inspect fuel injectors for leaks or clogs.
• Clean or replace any injectors that are not functioning properly.

5. Check Air Intake System

• Inspect the air filter for cleanliness and replace if necessary.
• Check the intake manifold and hoses for any leaks or blockages that could affect air flow.
• Replace any damaged hoses or components.

6. Verify Fuel System Pressure

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position without starting the engine to check pressure.
• Ensure the fuel pressure is within manufacturer specifications (usually between 40-50 psi).
• Replace the fuel pump if the pressure is inadequate.