EGR Control System Inspection

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 P0403:00 is shown. Perform DTC inspection. (See DTC P0403:00 .)
Start the engine and idle it.
Warm up the engine to normal operating temperature.
Access the following PIDs: (See ON-BOARD DIAGNOSTIC TEST .)
- APP1
- APP2
- ECT
- RPM
- SEGRP_DSD
- VSS
Idle the vehicle and verify that the SEGRP value is 0.
Put the vehicle in drive.
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 .)
  - Wiring harness and connectors (Main relay-EGR valve-PCM)
- If the SEGRP_DSD value does not increase, inspect the VSS, APP1, APP2, TP_REL and ECT PIDs. (See PCM INSPECTION .)
Stop the vehicle and verify that the SEGRP value returns to 0.