how to diagnose a P0302 code on Toyota RAV4 Fourth Generation (2013-2018)

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery cable to prevent electrical shock.

2. Inspect and Replace Spark Plug and Ignition Coil

1. Remove Engine Cover (if applicable)

   • Unbolt and lift off the engine cover to access ignition components.

2. Remove Spark Plug

   • Using a spark plug socket, remove the spark plug from cylinder 2.
   • Inspect the spark plug for wear or carbon buildup.

3. Replace Spark Plug (if necessary)

   • Install a new spark plug (specifications: NGK ILZKR7B11 or equivalent).
   • Torque to manufacturer specifications (typically around 13 lb-ft).

4. Inspect and Replace Ignition Coil

   • Disconnect the electrical connector from the ignition coil.
   • Remove the ignition coil by unbolting it.
   • Install a new ignition coil, ensuring a secure fit.
   • Reconnect the electrical connector.

3. Check and Replace Fuel Injector (if necessary)

1. Locate Fuel Injector

   • Identify the fuel rail and locate the injector for cylinder 2.

2. Remove Fuel Injector Connector

   • Disconnect the electrical connector from the fuel injector.

3. Remove Fuel Injector

   • Release any fuel pressure before removal by using a fuel pressure gauge.
   • Unbolt the fuel rail and carefully extract the injector from the rail.

4. Install New Fuel Injector

   • Apply a small amount of engine oil to the O-ring of the new injector.
   • Insert and secure it back in the fuel rail.
   • Reconnect the electrical connector.

4. Compression Test

1. Perform Compression Test

   • Remove spark plugs from all cylinders for easier cranking.
   • Insert a compression gauge into the cylinder 2 spark plug hole.
   • Crank the engine and note the compression reading; compare it to specifications.

2. Address Compression Issues

   • If compression is low, additional diagnostics may be required (such as a leak-down test or valve inspection).