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 WDS or equivalent to the DLC-2 and verify that the DTC P0403 is shown. Perform DTC inspection (See DTC TABLE Diagnostic Trouble Code Descriptions)

2. Start the engine and run it at idle
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 increases
- If the SEGRP value does not increase, inspect the VSS, APP1, APP2, TP_REL and ECT PIDs (See PCM INSPECTION)
- If the SEGRP value does increases, inspect the following
- EGR valve (Stuck open or close)
- Wiring harness and connectors (Main relay-EGR valve-PCM)

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