how to diagnose misfires in my Toyota RAV4 XA40 (2013-2018) with code P0302?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the vehicle battery to ensure safety while working on the electrical systems.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, dielectric grease
• Remove the ignition coil from cylinder 2 by unscrewing the retaining bolts and disconnecting the electrical connector.
• Remove the spark plug from cylinder 2 using a spark plug socket.
• Inspect the spark plug for wear or damage. Replace with a new spark plug if necessary.
• Apply dielectric grease to the tip of the new spark plug and reinstall it, tightening to the manufacturer’s specified torque (typically around 13-15 lb-ft).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, inspect the ignition coil for cylinder 2.
• Test the ignition coil using a multimeter for primary and secondary resistance.
• Replace the ignition coil if it is faulty or shows abnormal readings.
• Reinstall the ignition coil and ensure the electrical connector is secure.

4. Inspect Fuel Injector

• If the ignition system is functioning correctly, remove the fuel injector for cylinder 2.
• Check for clogs or leaks; clean or replace the injector as necessary.
• Reinstall the fuel injector ensuring proper connection and sealing.

5. Reassemble and Test

• Reconnect the battery and start the engine to check for any remaining trouble codes.
• Let the engine reach operating temperature and monitor for any signs of misfire.