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
.)
- Start the engine and idle it.
- Warm up the engine to normal operating temperature.
- Access the following PCM PIDs: (See ON-BOARD DIAGNOSTIC TEST
.)
- ECT, RPM, SEGRP_DSD, APP1, APP2, 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.
- Put the vehicle in drive.
- Depress the accelerator pedal and verify that the SEGRP_DSD value is increased.
- If the EGR valve increases, inspect the following:
- EGR valve (stuck open or close) (See EGR VALVE INSPECTION
.)
- Wiring harness and connectors (Main relay-EGR valve-PCM)
- If the SEGRP_DSD value does not increase, inspect the VSS, APP1, APP2, TP REL and ECT PIDs. (See PCM INSPECTION
.)
- Stop the vehicle and verify that the SEGRP value returns to 0.