how to diagnose a P0302 code on Toyota Camry Eighth Generation (2018-present)?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before proceeding with repairs.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench
• Remove the ignition coil for cylinder 2.
• Use the spark plug socket to remove the spark plug.
• Inspect the spark plug for damage; replace if worn or fouled.
• Install the new spark plug, ensuring it is torqued to the manufacturer's specification (typically around 13-15 ft-lbs).
• Reinstall the ignition coil.

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, multimeter
• Remove the ignition coil for cylinder 2 again if not already done.
• Test the ignition coil with a multimeter to ensure proper resistance (consult the service manual for specifications).
• If defective, replace the ignition coil with a new one.
• Reinstall the ignition coil onto the spark plug.

4. Inspect Fuel Injector

• Tools Required: Noid light, multimeter
• Disconnect the fuel injector connector for cylinder 2.
• Use a noid light to check for injector pulse while cranking the engine.
• If no pulse is detected, test the wiring and ECM signal; replace the injector if found to be faulty.

5. Compression Test

• Tools Required: Compression tester
• Remove the spark plug for cylinder 2.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading; compare with specifications (usually around 180 psi).
• If readings are low, further diagnosis of engine internals may be necessary.