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Home >> Chevrolet >> 2002 >> Camaro Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P0401: EGR Insufficient Flow Detected >> 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. Are there any MAP DTCs 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 for leaks. Repair the exhaust system as necessary. Did you find and correct the condition? If yes, go to step  7. If no, go to next step.
  4. Check the EGR valve gasket and pipes for leaks. Clean or replace the EGR system components as necessary. Did you find and correct the condition? If yes, go to step  7. If no, go to next step.
  5. Remove the EGR valve. Inspect the following items for a leak or for a restriction:
    • The EGR pintle.
    • The EGR valve passages.

    Did you find and correct the condition? If yes, go to step  7. If no, go to next step.

  6. Remove the EGR inlet and outlet pipes from the exhaust manifold and the intake manifold. Inspect the manifold EGR ports and the EGR inlet and outlet pipes for a blockage caused by excessive deposits or other damage. 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 OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC. Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  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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