EGR Control System Inspection
- Crank the engine and verify that EGR valve operation (initial operation) sound is heard.
- 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.
- Stop the engine.
- Remove the EGR valve. (See
EGR VALVE REMOVAL/INSTALLATION
).
- Connect the EGR valve connector.
- Switch the ignition to ON.
- Increase the step value of EGR valve from 0
to 40
using SEGRP PID. (See
ON-BOARD DIAGNOSTIC TEST [MZR 1.5]
).
- 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.