how to troubleshoot the P0302 code in my Toyota RAV4 XA40 (2013-2018)?

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, multimeter, compression tester, and fuel injector cleaner.
• Ensure the vehicle is parked on a flat surface and the engine is cool.

2. Inspect Spark Plug

• Remove the spark plug from cylinder 2 using a socket set.
• Check for signs of fouling (carbon deposits, oil, etc.) or excessive wear.
• Replace the spark plug if necessary with a new one that meets OEM specifications.

3. Check Ignition Coil

• Disconnect the ignition coil connector from cylinder 2.
• Use a multimeter to test the resistance of the ignition coil (specifications should be in the service manual).
• Replace the ignition coil if it is out of specifications.

4. Inspect Wiring and Connectors

• Visually inspect the wiring harness and connectors for damage or corrosion.
• Repair or replace any damaged wires or connectors.

5. Compression Test

• Remove all spark plugs and disconnect the ignition coils.
• Insert the compression tester into the cylinder 2 spark plug hole.
• Crank the engine and note the compression reading. It should meet OEM specifications.
• If compression is low, investigate potential causes such as valve issues or head gasket failure.

6. Fuel Injector Inspection

• Use a fuel injector cleaner or perform an injector test to ensure it is functioning properly.
• Replace the fuel injector for cylinder 2 if it is clogged or malfunctioning.