what does code P0302 mean for my Toyota Highlander Third Generation (2014-2019)

Solution

1. Preparation

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

2. Inspect and Replace Ignition Components

1. Remove Engine Cover: If applicable, remove the engine cover using a socket set.
2. Inspect Spark Plug:
   • Remove the spark plug from cylinder 2 using a spark plug socket.
   • Inspect the spark plug for wear, carbon deposits, or damage. Replace if necessary.
   • Torque new spark plug to manufacturer specifications (typically 13-15 lb-ft).
3. Inspect Ignition Coil:
   • Disconnect the ignition coil connector and remove the ignition coil from cylinder 2.
   • Check for physical damage and test with a multimeter for proper resistance (consult service manual for specific resistance values).
   • Replace if faulty.

3. Check Fuel Injector

1. Remove Fuel Injector Connector: Disconnect the electrical connector from the fuel injector.
2. Test Fuel Injector:
   • Use a multimeter to check the resistance of the injector (ensure it meets specifications).
   • Perform a buzz test by applying voltage to the injector to ensure it clicks.
3. Replace Injector: If defective, remove and replace with a new fuel injector. Torque to specifications (typically around 15 lb-ft).

4. Compression Test

1. Remove Spark Plug: Ensure the spark plug is removed from cylinder 2.
2. Perform Compression Test:
   • Insert the compression gauge into the spark plug hole and crank the engine.
   • Record the pressure reading and compare to manufacturer specifications (typically 150-200 psi).
3. Address Low Compression: If compression is low, further inspection may be necessary for valves or piston rings.

5. Reassemble Components

• Reinstall all components in reverse order.
• Reconnect the negative battery terminal.