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Home >> Lexus >> 1998 >> ES 300 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Tests >> DTC P0300-P0306: Random Misfire Detected >> Confirmation Test
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Confirmation Test

  1. Connect scan tool to Data Link Connector (DLC) No. 3. See Figure. Check for any DTCs and freeze frame data. If any other DTCs are set, diagnose them first. If using Lexus scan tool, switch to CHECK mode. Drive vehicle several times within freeze frame data parameters. If using OBD-II scan tool, turn engine off after driving vehicle.
  2. If freeze frame data is not available, start engine and allow to idle for 3.5 minutes or more. Raise engine speed to 1000 RPM for 3 minutes or more. Raise engine speed to 2000 RPM for 1.5 minutes or more. Raise engine speed to 3000 RPM for 1 minute or more. Check for any DTCs and freeze frame data. Turn ignition off for 5 seconds.
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