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 [MZR 1.5] ).
- If DTC is displayed, perform the DTC inspection. (See DTC P0403:00 [MZR 1.5] ).
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 [MZR 1.5] ).
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 [MZR 1.5] ).
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 [MZR 1.5] ).
- 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.