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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to prevent electrical shock.
• Allow the engine to cool before starting work.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector on cylinder 1.
• Unscrew the ignition coil and lift it out.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for signs of wear or damage; replace if necessary (specifications: gap should be set to 0.043 inches).
• Install a new spark plug and torque to manufacturer specifications (typically around 13 ft-lbs).
• Reinstall the ignition coil, ensuring it is seated properly, and reconnect the connector.

3. Check Fuel Injector

• Tools Required: Fuel injector tester or noid light
• Remove the fuel injector connector from cylinder 1.
• Connect a fuel injector tester or noid light to the connector.
• Crank the engine to check for proper operation (should flash or indicate activation).
• If no signal, inspect wiring and connectors; if injector is faulty, replace with a new one.

4. Perform Compression Test

• Tools Required: Compression tester
• Remove all spark plugs for easier cranking.
• Insert the compression tester into the cylinder 1 spark plug hole.
• Crank the engine for a few seconds and read the compression value.
• Compare the reading to the manufacturer's specifications (typically around 180 psi).
• If compression is low, further investigation of internal components may be required.