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Home >> Acura >> 1999 >> 3.2TL >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0401: EGR System - Insufficient Flow Detected
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DTC P0401: EGR System - Insufficient Flow Detected

  1. Perform PCM reset procedure. See PCM RESET PROCEDURE/CLEARING CODES  under SELF-DIAGNOSTIC SYSTEM. Connect scan tool. Test drive vehicle with no electrical load. Decelerate gradually from 55 MPH for at least 5 seconds. If DTC P0401 resets, go to next step. If DTC P0401 does not reset, problem is intermittent. System is okay at this time.
  2. Clean intake manifold EGR port and EGR passage with carburetor cleaner. Clean passage inside EGR valve with carburetor cleaner, or replace EGR valve as necessary.
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