how to diagnose a P0302 code in my Toyota RAV4 Fourth Generation (2013-2018)?

Solution

1. Preparation

• Gather tools and parts for repair.
• Disconnect the negative terminal of the battery before working on electrical components to ensure safety.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2:
  1. Disconnect the electrical connector from the ignition coil.
  2. Unscrew and remove the ignition coil from the spark plug.
• Remove the spark plug:
  1. Use a spark plug socket and ratchet to unscrew and remove the spark plug.
• Inspect the spark plug for fouling or wear:
  1. Replace the spark plug if necessary (gap according to manufacturer specifications).
• Reinstall the new spark plug and ignition coil:
  1. Install the spark plug and torque to the manufacturer's specifications (typically around 13 ft-lbs).
  2. Reattach the ignition coil and connector.

3. Check and Replace Fuel Injector

• Inspect fuel injector functionality:
  1. Use an injector tester to verify operation.
• If faulty, remove the fuel injector:
  1. Disconnect the electrical connector and fuel line (be cautious of fuel spillage).
  2. Remove the retaining clips and pull out the injector.
• Install the new fuel injector:
  1. Lubricate the O-rings on the new injector and insert it into the rail.
  2. Reattach the fuel line and connector.

4. Perform a Compression Test (if necessary)

• Remove the spark plug from cylinder 2.
• Insert the compression gauge into the spark plug hole.
• Crank the engine and record the compression reading:
  1. Compare it with specifications (usually around 120-200 psi).
• If compression is low, further investigation into potential internal engine issues is required.