what does it mean when my Toyota Corolla E170 (2013-2019) shows P0302 code?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter.
• Disconnect the battery to prevent electrical shock during repairs.

2. Inspect and Replace Spark Plug

1. Locate cylinder 2 spark plug in the engine bay.
2. Remove the ignition coil from cylinder 2 (typically involves unplugging the connector and unscrewing bolts).
3. Remove the spark plug using a spark plug socket.
4. Inspect the spark plug for wear or carbon deposits; replace if necessary.
5. Install a new spark plug, ensuring the correct gap is set (usually around 0.044 inches for most Toyota engines).
6. Reattach the ignition coil and reconnect the wiring harness.

3. Test and Replace Ignition Coil (if necessary)

1. Use a multimeter to measure the resistance of the ignition coil; compare with specifications in the service manual.
2. If the coil is faulty, remove the ignition coil from cylinder 2.
3. Install a new ignition coil and securely fasten it.

4. Check and Replace Fuel Injector (if necessary)

1. Disconnect the fuel line and wiring harness from the fuel injector on cylinder 2.
2. Remove the fuel injector using a socket or wrench.
3. Test the injector for proper operation using a multimeter or injector tester.
4. If faulty, install a new fuel injector and reconnect the fuel line and wiring harness.

5. Compression Testing

1. Remove the spark plug from cylinder 2.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine and record the compression reading; it should be within the manufacturer’s specified range.
4. If compression is low, further inspection may be needed for internal engine issues.