how to diagnose a P0302 code in my Toyota Camry Seventh Generation (2012-2017)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, compression tester, noid light, torque wrench.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before beginning work.

2. Replace Spark Plug and Ignition Coil

• Sub-steps:
  1. Remove the engine cover if applicable (use socket set).
  2. Disconnect the ignition coil connector for cylinder 2.
  3. Remove the ignition coil by unscrewing the bolts and pulling it out.
  4. Remove the spark plug using a spark plug socket and inspect it for wear or damage.
  5. Install a new spark plug (torque to manufacturer specifications, typically around 13-15 ft-lbs).
  6. Install a new ignition coil, securing it with bolts and reconnecting the connector.

3. Inspect and Replace Fuel Injector

• Sub-steps:
  1. If the ignition components are good, disconnect the fuel injector connector for cylinder 2.
  2. Use a noid light to check for injector pulse; if no pulse, inspect the wiring or replace the injector.
  3. If the injector is faulty, remove it using a fuel injector puller.
  4. Install a new fuel injector, ensuring it is seated correctly and reconnect the electrical connector.

4. Perform Compression Test

• Sub-steps:
  1. Remove all spark plugs to allow for accurate compression testing.
  2. Insert the compression tester into the spark plug hole for cylinder 2.
  3. Crank the engine for a few seconds and record the compression reading.
  4. Compare the reading to the manufacturer’s specifications (typically around 180 psi). If it's low, further investigation of mechanical issues is needed.