how to diagnose a P0302 code in my Toyota Corolla E170 (2013-2019)

Solution

1. Preparation

• Gather necessary tools and parts, and ensure the vehicle is parked on a flat surface with the engine turned off.
• Disconnect the battery to avoid electrical shock.

2. Spark Plug Inspection

• Remove the ignition coil for cylinder 2:
  • Use a socket set to remove the bolts securing the ignition coil.
  • Pull the ignition coil straight out to avoid damage.
• Remove the spark plug:
  • Use a spark plug socket to unscrew and remove the spark plug from cylinder 2.
• Inspect the spark plug:
  • Check for signs of wear, oil deposits, or abnormal coloration. Replace if necessary.

3. Ignition Coil Testing

• Test the ignition coil:
  • Use a multimeter to measure the primary and secondary resistance of the ignition coil according to the specifications in the service manual.
• Replace the ignition coil if it does not meet specifications.

4. Fuel Injector Inspection

• Test the fuel injector:
  • Use a noid light or a multimeter to check for electrical signal delivery to the injector.
• Clean or replace the fuel injector if it is clogged or not functioning properly.

5. Compression Test

• Perform the compression test:
  • Remove the spark plug and connect the compression gauge.
  • Crank the engine and record the compression reading for cylinder 2. Compare with the manufacturer’s specifications.
• Address any low compression issues by performing necessary repairs (valve adjustment, head gasket replacement, etc.).