EGR Control System Inspection

If simulation function of M-MDS is used: 

1. Crank the engine and verify that EGR valve operation (initial operation) sound is heard.
   • If the operation sound is not heard, connect the M-MDS to the DLC-2 and verify that the DTC P0403 is shown. Perform the DTC inspection. (See DTC P0403 [LF] ).
2. Start the engine run it at idle.
3. Increase the step value of EGR valve from 0 to 52  using the SEGR PID of simulation function.
4. Operate the EGR valve and inspect if the engine speed becomes unstable or the engine stalls.
   • If the engine speed will not change, proceed to following.
   1. Stop the engine.
   2. Remove the EGR valve. (See EGR VALVE REMOVAL/INSTALLATION [LF] ).
   3. Connect the EGR valve connector.
   4. Turn the ignition switch to the ON position.
   5. Increase the step value of EGR valve from 0 to 52  using the SEGRP PID.
   6. Verify that the EGR valve operates according to the SEGRP_PID.
      • If the EGR valve is operated, clean the EGR valve and EGR gas passage.
      • If the EGR valve will not operate, replace the EGR valve. (See EGR VALVE REMOVAL/INSTALLATION [LF] ).
5. Start the engine and warm it up completely.
6. Access the following PIDs.
   • ECT, RPM, SEGRP, APP1, APP2, TP, VSS
7. Idle the vehicle and verify that the SEGRP value is 0.
   CAUTION:

   • While performing this step, always operate the vehicle in a safe and lawful manner.
   • When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later.
8. Put the vehicle drive.
9. Depress the accelerator pedal and verify that the SEGRP value is increased.
   • If the SEGRP value will not increase, inspect the VSS, TP and ECT PIDs. (See PCM INSPECTION [LF] ).
10. Stop the vehicle and verify that the SEGRP value is returned to 0  .

If simulation function of M-MDS is not used: 

1. Crank the engine and verify that EGR valve operation (initial operation) sound is heard.
   • If the operation sound is not heard, connect the M-MDS to the DLC-2 and verify that the DTC P0403 is shown. Perform DTC inspection. (See DTC P0403 [LF] ).
2. Start the engine and idle it.
3. Warm up the engine to normal operating temperature.
4. Access the following PIDs:
   • ECT, RPM, SEGRP_DSD, APP1, APP2, VSS
5. Idle the vehicle and verify that the SEGRP value is 0. 
6. Put the vehicle in drive.
7. Depress the accelerator pedal and verify that the SEGRP_DSD value is increased.
   • If the EGR valve increases, inspect the following:
     • EGR valve (stuck open or close) (See EGR VALVE INSPECTION [LF] ).
     • Wiring harness and connectors (Main relay-EGR valve-PCM)
   • If the SEGRP_DSD value does not increase, inspect the VSS, APP1, APP2, TP and ECT PIDs. (See PCM INSPECTION [LF] ).
8. Stop the vehicle and verify that the SEGRP value returns to 0  .