Exhaust Gas Recirculation: Testing and Inspection

1. Verify that EGR valve operation (initial operation) sound is heard when the ignition key is turned to ON.
- If the operation sound is not heard, connect the SSTs (NGS tester) to DLC-2 and verify that the DTC No. P0401, P0402, P1496, P1497, P1498 or P1499 is shown. Carry out troubleshooting of DTC No. P0401, P0402, P1496, P1497, P1498 or P1499.

2. Start the engine and run it at idle.
3. Select the SIMULATION TEST function on the NGS display.
4. Increase the step value of EGR valve from 0 to 40 using SEGRP PID.
5. Operate the EGR valve and inspect if the engine speed becomes unstable or the engine stalls.
- If the engine speed will not change, go to the next step.

6. Stop the engine.
7. Remove the EGR valve.
8. Connect the EGR valve connector.
9. Turn the ignition key to ON.
10. Select the SIMULATION TEST function on the NGS display.
11. Increase the step value of EGR valve from 0 to 40 using SEGRP PID.
12. Inspect the EGR valve operation.
- If the EGR valve is operating, clean the EGR valve and reinspect from Step 3.
- If the EGR valve will not operate, replace the EGR valve and reinspect from Step 3.

13. Warm up the engine to normal operating temperature.
14. Select the PID/DATA MONITOR AND RECORD function on the NGS display.
15. Select the following PIDs.
- SEGRP
- RPM
- VS
- TP V
- ECT V

16. Let the vehicle idle and verify that the SEGRP value is 0.
17. Put the vehicle is drive.
18. Depress the accelerator pedal and verify that the SEGRP value increases.
- If the SEGRP value will not increase, inspect the VS, TP V and ECT V PIDs. (See PCM Inspection Using the SSTs (NGS tester).)

19. Stop the vehicle and verity that the SEGRP is returned 0.