how to diagnose P0302 code on Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the ignition is off.
• Disconnect the battery to prevent any electrical shorts.

2. Inspect Spark Plugs and Ignition Coils

• Remove the engine cover using a socket set.
• Disconnect the electrical connector from the ignition coil of cylinder 2.
• Remove the ignition coil using a socket wrench.
• Inspect the spark plug for signs of wear (carbon buildup, cracks).
• Replace the spark plug if necessary (use OEM or equivalent part).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Compression Test

• Remove the spark plug from cylinder 2.
• Insert the compression tester into the spark plug hole.
• Crank the engine for several seconds and record the compression reading.
• Compare with manufacturer specifications (typically around 180-200 psi).
• If the compression is low, further investigation into the head gasket or piston rings may be needed.

4. Check Fuel Injector

• Disconnect the electrical connector from the fuel injector of cylinder 2.
• Use a noid light to check for proper electrical signal (light should flash).
• If no signal, inspect the wiring harness for damage.
• If the signal is present, test the resistance of the fuel injector with a multimeter (specifications should be around 12-16 ohms).
• Replace the fuel injector if it is faulty.