how to diagnose P0302 misfire code on Toyota RAV4 XA40 (2013-2018)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Inspect and Replace Spark Plug

1. Remove the engine cover (if applicable) using a socket set.
2. Disconnect the ignition coil connector for cylinder 2.
3. Remove the ignition coil using a socket set.
4. Unscrew the spark plug from cylinder 2 using a spark plug socket.
5. Inspect the spark plug for wear, carbon build-up, or damage; replace if necessary.
6. Install a new spark plug with the correct gap (refer to manufacturer specifications).
7. Reinstall the ignition coil and reconnect the connector.

3. Inspect and Replace Ignition Coil

1. If the spark plug is in good condition, inspect the ignition coil for signs of damage or failure.
2. Replace the ignition coil for cylinder 2 if needed.
3. Reconnect the ignition coil connector securely.

4. Test Fuel Injector

1. Using a noid light, connect it to the fuel injector connector for cylinder 2.
2. Crank the engine and observe if the noid light flashes, indicating the injector is receiving a signal.
3. If the noid light does not flash, check the wiring and ECM signal.
4. If the injector is faulty, replace it with a new one.

5. Reassemble and Test

1. Reinstall any engine covers and ensure all connections are secure.
2. Reconnect the negative battery terminal.
3. Clear the P0302 code using the OBD-II scanner.