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Home >> Saturn >> 1996 >> SC2 Automatic, MP6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0401 - EGR System Insufficient Flow >> Diagnostic Procedures
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Diagnostic Procedures

  1. Install scan tool. Start engine. Using scan tool, command EGR valve to full open. If engine begins to run rough when EGR is opened, problem is intermittent. See DIAGNOSTIC AIDS. If engine does not run rough when EGR is opened, go to next step.
  2. If EGR pintle position increases when valve is opened, clean or replace EGR valve. If EGR pintle position does not increase when valve is opened, refer to DTC P1406 test for diagnosis.
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