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. (See ON-BOARD DIAGNOSTIC TEST .)
- If DTC is displayed, perform the DTC inspection. (See DTC P0403:00 .)
Start the engine and idle it.
Increase the step value of EGR valve from 0 to 40 using SEGRP PID. (See ON-BOARD DIAGNOSTIC TEST .)
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 .)
3. Connect the EGR valve connector.
4. Switch the ignition to ON.
5. Increase the step value of EGR valve from 0 to 40 using SEGRP PID. (See ON-BOARD DIAGNOSTIC TEST .)
6. Inspect the EGR operation. (See EGR VALVE INSPECTION .)
  - If the EGR valve is operated, clean the EGR valve and reinspect from Step 2.
  - If the EGR valve will not operate, replace the EGR valve and reinspect from Step 2.
Start the engine and warm it up completely.
Access the following PIDs: (See ON-BOARD DIAGNOSTIC TEST .)
- ECT1
- RPM
- SEGRP_DSD
- TP REL
- TP1
- TP2
- VSS
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.
Drive the vehicle.
Depress the accelerator pedal and verify that the SEGRP_DSD value is increased.
- If the SEGRP_DSD value will not increase, inspect the VSS, TP REL, TP1, TP2 and ECT1 PIDs. (See PCM INSPECTION .)
Stop the vehicle and verify that the SEGRP value is returned 0 .