EGR Control Inspection

EGR CONTROL INSPECTION
1. Verify that EGR valve operation (initial operation) sound is heard when the ignition switch turned to ON.

Special Service Tool New Generation Star Tester Connected to Data Link Connector 2:

2. If the operation sound is not heard, connect the Special Service Tools New Generation Star (NGS) tester to the data link connector 2 and verify that the diagnostic trouble code No. P1496, P1497, P1498 or P1499 is shown. Carry out troubleshooting of code No. P1496, P1497, P1498 or P1499.
3. Start the engine and run it at idle.




4. Select the SIMULATION TEST function on the NGS display.
5. Increase the step value of EGR valve from 0 to 40 by using "SEGRP". Operate the EGR valve and check if the engine speed becomes unstable or the engine stalls.
6. If the engine speed will not change, do as follows.
a. Stop the engine.
b. Remove the EGR valve.
c. Connect the EGR valve connector.
d. Turn the ignition switch to ON.
e. Select the SIMULATION TEST function on the NGS display.
f. Increase the step value of EGR valve from 0 to 40 by using "SEGRP". Check the EGR operation.
- If the EGR valve is operated, clean the EGR valve and recheck from step 3.
- If the EGR valve will not operate, replace the EGR valve and recheck from step 3.

7. Warm up the engine to normal operating temperature.




8. On level ground, jack up the vehicle and support it evenly on safety stands or set the vehicle on the chassis roller.




9. Select the PID/DATA MONITOR function on the NGS display.
10. Select the following items.
- SEGRP
- RPM
- VSP
- TPV
- ECTV

11. Let the vehicle idle and verify that the SEGRP value is 0.
12. Depress the accelerator pedal and verify that the SEGRP value is increased.
13. If the SEGRP value will not increased, do as follows.
a. Verify that the TP V value is increased when the with accelerator pedal is depressed.
b. Verify that the VSP is increased when the tires are rotated.
c. Verify that the ECT V is within the specified value when the engine warms up.
d. If not as specified, check the following.
- Throttle position sensor
- Vehicle speed sensor
- Engine coolant temperature sensor
- Wiring harnesses and connectors (PCM - throttle position sensor, PCM - vehicle speed sensor, PCM - engine coolant temperature sensor)

14. Stop the vehicle and verify that the SEGRP is returned 0.