how to diagnose P0302 code in Toyota Corolla E170 (2013-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to avoid electrical short circuits.

2. Inspect and Replace Spark Plug

• Remove the ignition coil for cylinder 2 using a socket set.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear; replace if necessary.
• Install a new spark plug and torque it to the manufacturer's specification (typically 13-16 lb-ft).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil using a multimeter. Check for resistance values according to the service manual.
• If faulty, replace the ignition coil with a new one.
• Reinstall the ignition coil and ensure it is securely connected.

4. Test Fuel Injector

• Remove the fuel injector for cylinder 2 and inspect for clogs or defects.
• If it is clogged, clean it using a fuel injector cleaner or replace it if necessary.
• Reinstall the fuel injector and ensure proper sealing.

5. Compression Test

• Conduct a compression test on cylinder 2 to determine if the cylinder has acceptable pressure (typically around 180-200 psi).
• If compression is low, investigate further for potential valve issues or head gasket failure.

6. Inspect Vacuum Lines

• Visually inspect all vacuum lines leading to the intake manifold for cracks or disconnections.
• Replace any damaged vacuum lines to ensure proper engine operation.