Inspection Procedure

HINT: 

• By using the Control the EGR Step Position Active Test, the operation of the EGR valve can be checked.
• When the engine is idling steadily with the EGR valve fully closed, if the EGR valve is normal and it is opened using the Active Test, the Data List value changes as follows.

  Data List	Change in Data List when Number of Steps is Increased Using Control the EGR Step Position Active Test
  Engine Speed	Idle becomes rough
  MAP	Pressure rises

• Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.