my Toyota Corolla E210 (2019-2024) has a P0301 code, what does that mean?

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect Ignition System

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the spark plug from cylinder 1 using the spark plug socket.
• Inspect the spark plug for wear or carbon buildup; replace if necessary.
• If the spark plug is in good condition, check the ignition coil by removing it and inspecting for cracks or corrosion.
• Reinstall the ignition coil and spark plug, ensuring they are torqued to manufacturer specifications. (Spark plug torque: 13 lb-ft)

3. Check Fuel Injector

• Tools Required: Fuel pressure gauge, injector cleaning kit (if needed).
• Disconnect the fuel injector connector for cylinder 1.
• Use a multimeter to test the injector resistance (should be within manufacturer specifications).
• If the injector is faulty, replace it with a new one; if it’s clogged, use an injector cleaning kit to clean it.

4. Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester and crank the engine several times.
• Record the compression reading and compare it to the manufacturer’s specifications (should be around 180 psi).
• If compression is low, further investigation into piston rings, valves, or gaskets is needed.

5. Inspect Vacuum System

• Tools Required: Vacuum gauge.
• Check the intake manifold and vacuum hoses for leaks.
• Use a vacuum gauge to monitor readings; a steady reading below normal indicates a leak.
• Replace any damaged hoses or components.