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Home >> Chevrolet >> 2003 >> Venture Base, Van Cargo Extended >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0401: EGR System - Insufficient Flow >> Diagnostic Procedures

Diagnostic Procedures

  1. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. DTC P0107 or P0108 also set? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
  3. Inspect the exhaust system for modification of original installed parts or leaks. Repair the exhaust system as necessary if you locate a problem. Did you find and correct the condition? If yes, go to step  7. If no, go to next step.
  4. Inspect for a vacuum leak between EGR valve and intake manifold. Did you find and correct the condition? If yes, go to step  7. If no, go to next step.
  5. Remove EGR valve. Visually and physically inspect EGR pintle and EGR pintle for a leak or a restriction. Did you find and correct the condition? If yes, go to step  7. If no, go to next step.
  6. Remove EGR inlet pipe from exhaust manifold. Inspect manifold EGR ports and EGR inlet pipe for blockage caused by excessive deposits or other damage. Correct the condition as necessary if a problem is found. Did you find and correct the condition? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  7. Clear the DTCs with a scan tool. Turn ignition off for 30 seconds. Start engine. Operate the vehicle within the Conditions for Running DTC. See CONDITIONS FOR SETTING DTC . Does the DTC run and pass? If yes, go to step  2. If no, go to next step.
  8. Observe the stored information, Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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