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Home >> Lexus >> 2007 >> LS 460L >> Repair and Diagnosis >> External Pages >> Different car >> Section 93 (Engine Control System) >> DTC P0400: EGR Function >> DTC Confirmation Procedure >> Testing Condition: >> With GST
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With GST

WARNING: This page is about a different car, the 2004 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
  2. Check engine coolant temperature in MODE 1 with GST.
    1. Engine coolant temperature: Less than 40°C (104°F) 

    If the value is out of range, park the vehicle in a cool place and allow the engine temperature to stabilize. Do not attempt to lower the coolant temperature with a fan or means other than ambient air. Doing so may produce an inaccurate diagnostic result.

  3. Start engine and let it idle monitoring the engine coolant temperature value. When the engine coolant temperature reaches 70°C (158°F), immediately go to the next step.
  4. Maintain the following conditions for at least 1 minute.
    1. Engine speed: 1,200 - 3,600 RPM 
    2. Vehicle speed: More than 10 km/h (6 MPH) 
    3. Selector lever: Suitable position 
  5. Stop vehicle.
  6. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
  7. Repeat step 3 to 5.
  8. Select MODE 3 with GST.
  9. If DTC is detected, go to DIAGNOSTIC PROCEDURE  .
    • When using GST, DTC Confirmation Procedure should be performed twice as much as when using CONSULT-II because GST cannot display MODE 7 (1st trip DTC) concerning this diagnosis. Therefore, using CONSULT-II is recommended.