how to troubleshoot P0302 code in Toyota Corolla E140 (2006-2013)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the engine is cool before beginning repairs.
• Disconnect the negative terminal of the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug gap tool.
• Remove the ignition coil from cylinder 2.
• Remove the spark plug using the socket.
• Inspect the spark plug for damage or excessive wear.
• If necessary, replace the spark plug with a new one, ensuring it is gapped correctly (0.043 inches).
• Reinstall the ignition coil.

3. Check and Replace Ignition Coil

• If misfire persists after spark plug replacement, inspect the ignition coil.
• Tools Required: Multimeter.
• Use a multimeter to check the resistance of the ignition coil.
• If faulty, replace the ignition coil with a new one and reinstall.

4. Inspect Fuel Injector

• Tools Required: Fuel injector cleaner kit or replacement injector.
• Disconnect the fuel injector connector and check for proper electrical resistance.
• If the injector is clogged, clean it using a fuel injector cleaner kit; if it’s defective, replace it with a new injector.

5. Perform Compression Test

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 2.
• Insert the compression gauge into the spark plug hole and crank the engine to get a reading.
• Compare the compression reading with specifications (should be around 180 psi).
• If the compression is low, further diagnosis of the engine internals may be required.