Inspection Procedure

HINT: 

• By using the Control the EGR Step Position Active Test, the operation of the EGR valve can be checked.
• If the EGR valve is normal, the engine condition is as follows: The engine idles steady while the EGR valve is fully closed. When the EGR valve is opened using the Active Test, the Data List values will change as shown in the table below.

  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.