how to diagnose a P0302 code in my Toyota Corolla E210 (2019-2024)

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, torque wrench, multimeter, compression tester, fuel injector cleaning kit.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2:
  • Unscrew bolts holding the ignition coil using a socket set.
  • Carefully pull out the ignition coil.
• Remove the spark plug:
  • Use a spark plug socket to unscrew the spark plug.
  • Inspect the spark plug for wear, carbon deposits, or damage.
• Replace with a new spark plug if necessary.
• Reinstall the spark plug and torque to manufacturer specifications (typically 13-16 ft-lbs).

3. Check and Replace Ignition Coil

• Inspect the ignition coil for cracks or damage.
• If faulty, replace the ignition coil with a new one.
• Reinstall the ignition coil and secure it with bolts.

4. Inspect and Clean Fuel Injector

• Remove the fuel injector from cylinder 2:
  • Detach the fuel rail, ensuring to relieve fuel pressure.
  • Disconnect the fuel injector connector.
  • Unscrew the injector from the rail.
• Clean the injector using a fuel injector cleaning kit or replace it if defective.
• Reinstall the fuel injector and reconnect the fuel rail and electrical connector.

5. Compression Test

• Insert the compression tester into the spark plug hole of cylinder 2.
• Crank the engine to read the compression value.
• Compare the reading with the manufacturer's specifications (usually around 180-210 psi for most engines).
• If low, further inspection of the piston rings or valves may be needed.

6. Reconnect Battery and Test

• Reconnect the negative battery terminal.
• Start the engine and monitor for any check engine light or misfire symptoms.