Exhaust Gas Recirculation: Testing and Inspection

EGR Control System Inspection
1. Verify that EGR valve operation (initial operation) sound is heard when the ignition switch is turned to ON position.
- If the operation sound is not heard, connect M-MDS to the DLC-2 and verify that the DTC P0403 is shown. Perform DTC inspection. (See DTC TABLE [L3].) Diagnostic Trouble Code Descriptions

2. Start the engine and idle it.
3. Warm up the engine to normal operating temperature.
4. Select the following PIDs:
- ECT, RPM, SEGRP, APP1, APP2, TP_REL, VSS

5. Let the vehicle idle and verify that the SEGRP value is 0.
6. Put the vehicle in drive.
7. Depress the accelerator pedal and verify that the SEGRP value is increased.
- If the EGR valve will increase, inspect the following:
- EGR valve (stuck open or close)
- Wiring harness and connectors (Main relay - EGR valve - PCM)

- If the SEGRP value does not increase, inspect the VSS, APP1, APP2, TP_REL and ECT PIDs. (See PCM INSPECTION [L3].)

8. Stop the vehicle and verify that the SEGRP value returns to 0.