how to troubleshoot P0301 code on my Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

• Gather the necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety during the repair.
• Allow the engine to cool down if it has been running.

2. Inspect and Replace Spark Plug

• Remove the ignition coil for cylinder 1 by unfastening any retaining bolts and disconnecting the electrical connector.
• Extract the spark plug using a spark plug socket and ratchet.
• Inspect the spark plug for signs of wear, fouling, or damage; replace if necessary.
• Gap the new spark plug according to manufacturer specifications (typically 0.043 inches for Camry).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, inspect the ignition coil for cracks or corrosion.
• If faulty, replace the ignition coil with a new one. Ensure it matches the OEM specifications.
• Reinstall the ignition coil and reconnect the electrical connector.

4. Test Fuel Injector

• Disconnect the electrical connector from the fuel injector for cylinder 1.
• Use a multimeter to check the resistance of the injector; compare it to specifications (typically around 12-16 ohms).
• If the injector is faulty, replace it with a new one and reconnect.

5. Compression Test

• Use a compression gauge to test the compression in cylinder 1.
• Record the reading and compare it with the specifications provided in the service manual (typically around 180 psi).
• If the compression is low, further investigation into the valve seats or piston rings may be required.