what does it mean when my Toyota Corolla E170 (2013-2019) shows a P0301 code

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before beginning work.

2. Inspect and Replace Spark Plug and Ignition Coil

• Tools Required: Socket set, spark plug socket, torque wrench
• Remove the engine cover if necessary.
• Disconnect the ignition coil connector on cylinder 1.
• Remove the ignition coil bolt and pull out the ignition coil.
• Remove the spark plug using a spark plug socket. Inspect it for wear and replace it if necessary.
• Install a new spark plug, torqueing to the manufacturer's specifications (typically around 13-15 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test and Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector puller, multimeter
• Disconnect the fuel injector connector for cylinder 1.
• Use a multimeter to check the resistance of the injector (should typically be around 12-16 ohms; refer to specifications).
• If the injector is faulty, remove it using a fuel injector puller.
• Install a new fuel injector, ensuring proper alignment and securing it in place.

4. Check for Vacuum Leaks

• Tools Required: Vacuum gauge, smoke machine (optional)
• Inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Use a vacuum gauge to check for abnormal readings. If necessary, apply smoke to find hidden leaks.

5. Compression Test

• Tools Required: Compression gauge
• Remove all spark plugs.
• Insert the compression gauge into cylinder 1.
• Crank the engine for a few seconds and record the reading; it should match the manufacturer's specifications (typically 150-200 psi). Compare to other cylinders.