how to diagnose a Honda Accord 9th Generation (2013-2017) with a P0302 code

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2 by unscrewing the mounting bolts and disconnecting the electrical connector.
• Remove the spark plug from cylinder 2 using a spark plug socket.
• Inspect the spark plug for wear, carbon buildup, or damage. Replace if necessary.
• Install a new spark plug (tighten to the manufacturer’s specified torque, usually around 13 lb-ft).

3. Check and Replace Ignition Coil

• Inspect the ignition coil for signs of damage or corrosion.
• If necessary, replace the ignition coil with a new one, ensuring it is properly seated and connected.
• Reinstall the ignition coil and reconnect the electrical connector.

4. Test Fuel Injector

• Remove the fuel injector connector from cylinder 2.
• Using a multimeter, check the resistance of the injector (should be within the specified range; consult service manual).
• If faulty, replace the fuel injector.
• Reconnect the fuel injector connector after the inspection or replacement.

5. Perform Compression Test

• Remove the fuel pump relay to prevent fuel injection during the test.
• Remove the spark plugs for all cylinders to allow for easier cranking.
• Insert a compression gauge into cylinder 2 and crank the engine.
• Record the compression reading and compare it with the manufacturer’s specified range (usually around 180-210 psi).
• If the compression is low, further investigation is needed for potential mechanical issues.

6. Reassemble and Test

• Reinstall all components in reverse order of removal.
• Reconnect the battery and start the engine.
• Allow the engine to reach operating temperature and monitor for any check engine light activation.