Connect a diagnostic scan tool to the OBD-II port to retrieve trouble codes and perform system diagnostics on the 2019-2024 Toyota RAV4 2.5L I4 FWD.

Warnings

Tools required

Preparation

1. Park vehicle on level ground and engage parking brake
2. Turn ignition to OFF position
3. Ensure all accessories are turned off (radio, climate control, lights)
4. Have vehicle identification number (VIN) available for reference
5. If check engine light is on, note any driveability symptoms experienced

Procedure

1. 1

   Locate OBD-II diagnostic port
   The OBD-II diagnostic port is located under the driver's side dashboard, to the left of the steering column near the hood release lever. It is a 16-pin trapezoid-shaped connector. Use a flashlight if needed to locate the port clearly.
2. 2

   Connect scan tool to OBD-II port
   Firmly insert the scan tool connector into the OBD-II port until it clicks into place. Ensure the connection is secure and fully seated. If using a wireless adapter, verify it is properly inserted before proceeding.
3. 3

   Turn ignition to ON position
   Turn the ignition key to the ON position (or press the start button twice without pressing the brake pedal for push-button start models). Do not start the engine. The scan tool should power on automatically from the vehicle's power supply. Wait for the scan tool to initialize and establish communication with the vehicle's ECU.
4. 4

   Enter vehicle information
   On the scan tool, select the correct vehicle make (Toyota), model (RAV4), year (2019-2024), and engine type (2.5L I4). Some scan tools will auto-detect this information via VIN lookup. Verify the information displayed matches your vehicle.
5. 5

   Retrieve diagnostic trouble codes
   Navigate to the 'Read Codes' or 'Scan for DTCs' function on your scan tool. Allow the tool to communicate with all available control modules including engine, transmission, ABS, airbag, and body control modules. Record all diagnostic trouble codes (DTCs) displayed, including pending and stored codes. Note the code number, description, and which module reported each code.
6. 6

   Review freeze frame data
   Access freeze frame data for any stored codes. This shows the operating conditions when the fault was detected, including engine RPM, vehicle speed, coolant temperature, fuel trim values, and other relevant parameters. Record this information as it helps diagnose intermittent issues.
7. 7

   Check readiness monitors
   Navigate to the I/M Readiness or Monitor Status screen. Review all emissions readiness monitors to confirm which systems have completed their self-tests. On 2019-2024 RAV4 models, monitors include catalyst, evaporative system, oxygen sensor, EGR (if equipped), and others. Note any monitors showing 'Not Ready' status.
8. 8

   Review live data (if needed)
   If diagnosing an active driveability concern, access the live data stream function. Monitor key parameters such as oxygen sensor voltages, fuel trims, coolant temperature, throttle position, MAF sensor readings, and ignition timing. Compare values to known good specifications for proper system operation.
9. 9

   Document findings
   Record all diagnostic trouble codes, freeze frame data, readiness monitor status, and any relevant live data parameters. Note the date, mileage, and any symptoms reported. This documentation is essential for accurate diagnosis and tracking repair history.
10. 10

    Disconnect scan tool
    Turn the ignition to the OFF position. Carefully remove the scan tool connector from the OBD-II port by pressing any release tabs and pulling straight out. Store the scan tool properly.

Reassembly

1. No reassembly required for diagnostic scan procedure

Verification

• Verify all diagnostic trouble codes have been properly recorded and documented
• Confirm readiness monitor status has been checked if vehicle recently had codes cleared or battery disconnected
• If check engine light was on before scan, verify the associated trouble codes were retrieved
• Cross-reference any retrieved codes with Toyota technical service bulletins (TSBs) for known issues on 2019-2024 RAV4 2.5L models
• Use diagnostic information to develop repair plan before proceeding with component replacement

More procedures for this vehicle