Mode 3 (HO2S/TWC Verification)

Connect scan tool. Check RFC FLAG PID. If PID is off, complete Mode 1 before performing Mode 3. If PID is on, start engine. Allow engine to reach operating temperature. Turn all accessories off. Drive vehicle for at least 5 minutes. Drive vehicle at more than 40 MPH in Drive for one minute. Drive vehicle at 45-55 MPH in Drive for 3 minutes. Stop vehicle. Using scan tool, check drive mode completion status. If cycle is not complete, turn ignition off. Repeat test. If cycle is complete, check test results. If results are okay, ensure no DTCs are present. If results are not okay, repairs are not complete.