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Home >> Isuzu >> 2000 >> Rodeo S, 2.2 D >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.2L >> Diagnostic Trouble Code Identification >> DTC P0401: EGR System Insufficient Flow >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic II (OBD-II) system check. See SELF-DIAGNOSTICS - INTRODUCTION article. Go to next step.
  2. Start engine and allow it to idle. Using scan tool, monitor MAP signal. Quickly depress accelerator pedal halfway and release quickly, returning to idle. If scan tool showed immediate large change in MAP value, go to next step. If scan tool did not show immediate large change in MAP value, replace MAP sensor. Retest system.
  3. Inspect exhaust system for modifications or leaks. If a problem is found, repair as necessary and go to step  2. If no problem is found, go to next step.
  4. Remove EGR valve and check pintle, valve and passages and adapter for excessive deposits or restriction. Check EGR valve gasket and pipes for leaks. If a problem is found, repair as necessary and go to step  6. If no problem is found, go to next step.
  5. Remove EGR inlet and outlet pipes from exhaust and intake manifolds. Inspect manifold EGR ports and pipes for blockage or damage. If a problem is found, repair as necessary and go to next step. If no problem is found, see DIAGNOSTIC AIDS .
  6. 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. Read specified DTC. If scan tool displays DTC P0401 TEST RAN AND PASSED, repair is complete. If scan tool does not display DTC P0401 TEST RAN AND PASSED, return to step  2.
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