how to diagnose P0301 code in my Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

• Gather tools and parts required.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

1. Remove the ignition coil from cylinder 1 by unscrewing the bolts.
2. Pull the ignition coil straight out of the spark plug well.
3. Using a spark plug socket, remove the spark plug from cylinder 1.
4. Inspect the spark plug for wear or damage (e.g., carbon buildup, electrode wear).
5. If the spark plug is worn, replace it with a new one, ensuring the gap is set to the manufacturer’s specification.
6. Reinstall the ignition coil and secure it with the bolts.

3. Test and Replace Ignition Coil (if necessary)

1. Using a multimeter, measure the resistance of the ignition coil. Compare the readings with the specifications in the service manual.
2. If the ignition coil is out of specification, replace it with a new part.
3. Reinstall the ignition coil and reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

1. Remove the fuel injector from cylinder 1 by disconnecting the electrical connector and unscrewing it from the rail.
2. Inspect the injector for clogs and clean it using a fuel injector cleaner kit.
3. Reinstall the fuel injector and ensure proper sealing.

5. Perform Compression Test

1. Remove the spark plug from cylinder 1.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine and record the compression reading.
4. Compare the reading to the manufacturer’s specifications. If low, further investigation may be needed.