how to diagnose engine misfire P0302 in Honda Civic 11th Generation (2022-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Connect the battery charger to prevent battery drainage during diagnostics.

2. Replace Spark Plug

1. Remove the engine cover if applicable.
2. Disconnect the ignition coil connector from the coil on cylinder 2.
3. Remove the ignition coil using a socket set.
4. Unscrew the spark plug and remove it from the cylinder head.
5. Install a new spark plug, ensuring the gap is set to manufacturer specifications (usually around 0.044 inches).
6. Reinstall the ignition coil and reattach the connector.

3. Test/Replace Ignition Coil

1. If the spark plug replacement does not resolve the issue, test the ignition coil using a multimeter to check for resistance (typically 0.5-1.5 ohms for primary).
2. If the ignition coil is faulty, replace it with a new unit.
3. Reconnect the ignition coil and ensure all connections are secure.

4. Inspect/Replace Fuel Injector

1. Remove the fuel injector connector for cylinder 2.
2. Use a multimeter to check the injector's resistance; it should be within the specified range (consult service manual).
3. If the injector is faulty, remove it from the rail and install a new one.
4. Reconnect the fuel injector and ensure there are no leaks.

5. Compression Test (if needed)

1. Remove the spark plug from cylinder 2.
2. Insert a compression gauge into the cylinder and crank the engine.
3. Record the compression reading; it should match manufacturer specifications (usually 180-210 psi).
4. If the reading is low, further diagnostics on the engine internals may be necessary.