how to fix P0305 code in Toyota Tacoma N300 (2016-Present)

Learn how to diagnose and fix P0305 cylinder 5 misfire in Toyota Tacoma N300. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

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

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Disconnect the ignition coil connector from the spark plug.
• Using a spark plug socket, remove the spark plug from cylinder 5.
• Inspect the old spark plug for signs of wear (e.g., carbon buildup, cracks).
• Install a new spark plug, tightening it to the manufacturer's torque specification (typically around 13-15 ft-lbs).
• Reconnect the ignition coil and any connectors removed.

3. Inspect and Test Ignition Coil

• Remove the ignition coil from cylinder 5.
• Test the ignition coil with a multimeter to check for proper resistance (consult service manual for specifications).
• If the coil is faulty, replace it with a new one.
• Reinstall the ignition coil after testing.

4. Check Fuel Injector

• Disconnect the fuel injector connector for cylinder 5.
• Use a noid light to check for electrical signal; if there is no signal, trace wiring to find the issue.
• If the injector is suspected to be faulty, remove it and inspect for clogs.
• Replace the fuel injector if necessary and reinstall.

5. Test and Fix Vacuum Leaks

• Visually inspect vacuum lines connected to the intake manifold.
• Use a smoke machine or carburetor cleaner to identify leaks.
• Repair or replace damaged vacuum lines as needed.