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Home >> Mazda >> 2009 >> 5 Sport, 2.3 L, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Symptom Troubleshooting [Engine L3) >> Engine Control System Operation Inspection [L3] >> EGR Control System Inspection

EGR Control System Inspection

  1. 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 is shown. Perform DTC inspection. (See DTC TABLE [L3] .)
  2. Start the engine and idle it.
  3. Warm up the engine to normal operating temperature.
  4. Access the following PIDs:
    • ECT, RPM, SEGRP_DSD, APP1, APP2, VSS
  5. Idle the vehicle and verify that the SEGRP value is 0.
  6. Put the vehicle in drive.
  7. 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)
      • 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 [L3] .)
  8. Stop the vehicle and verify that the SEGRP value returns to 0.
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