EGR Control System Inspection

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 01-02A-21 DTC TABLE.)
Start the engine and run it at idle.
Warm-up the engine to normal operating temperature.
Select the following PIDs:
- ECT
- RPM
- SEGRP
- TP
- VSS
Let the vehicle idle and verify that the SEGRP value is 0 .
Put the vehicle in drive.
Depress the accelerator pedal and verify that the SEGRP value increases.
- If the SEGRP value does not increase, inspect the VSS, TP 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)
Stop the vehicle and verify that the SEGRP value returns to 0 .