how to fix P0301 code for misfire in Toyota Tacoma N300 (2016-Present)

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Sub-steps:
  1. Remove the ignition coil from cylinder 1 by unscrewing the retaining bolts and disconnecting the electrical connector.
  2. Remove the spark plug using the spark plug socket and ratchet.
  3. Inspect the spark plug for wear and replace it if necessary.
  4. Install the new spark plug and torque it to the manufacturer's specification (typically around 13 lb-ft).
  5. Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Ignition Coil (if necessary)

• Tools Required: Socket set, torque wrench.
• Sub-steps:
  1. Visually inspect the ignition coil for cracks or signs of damage.
  2. If faulty, remove the ignition coil from cylinder 1.
  3. Install the new ignition coil and torque it to the manufacturer's specification (usually around 7 lb-ft).
  4. Reconnect the electrical connector securely.

4. Test Fuel Injector

• Tools Required: Multimeter, fuel injector tester.
• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Use a multimeter to verify the resistance of the injector; it should match specifications (typically around 12-16 ohms).
  3. If the injector is faulty, replace it by removing the fuel rail, replacing the injector, and ensuring proper O-ring sealing.
  4. Reconnect the fuel injector harness.

5. Verify Compression

• Tools Required: Compression tester.
• Sub-steps:
  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, ensuring it meets manufacturer specifications (typically 180-220 psi).
  4. If low, further investigation may be needed for potential internal engine issues.