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Home >> Oldsmobile >> 2000 >> Intrigue GL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0401: EGR System Flow Insufficient >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Inspect exhaust system for modifications or leaks. Repair as necessary. After repairs, go to step  5. If no problem is found, go to next step.
  3. Remove EGR valve and check pintle, valve and passages and adapter for excessive deposits or restriction. Check EGR valve gasket and pipes for leaks. Repair as necessary. After repairs, go to step  5. If no problem is found, go to next step.
  4. Remove EGR inlet and outlet pipes from exhaust and intake manifolds. Inspect manifold EGR ports and pipes for blockage or damage. Repair as necessary. After repairs, go to next step. If no problem is found, see DIAGNOSTIC AIDS .
  5. Read and record FAILURE RECORDS data for DTC P0401. Clear DTCs and monitor EGR TEST COUNT while operating vehicle within conditions noted in Diagnostic Aids until 9-12 test counts/samples have been taken. Read SPECIFIC DTC. If scan tool indicates that this DTC TEST RAN AND PASSED, go to next step. If scan tool does not indicate that this DTC TEST RAN AND PASSED, repeat step  2.
  6. Using scan tool, review CAPTURED INFO data. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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