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Home >> Acura >> 2001 >> 3.2CL Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 17 (Engine Performance System Self-Diagnostics) >> Diagnostic Tests >> DTC P0401: Exhaust Gas RECIRCULATION (EGR) Insufficient Flow >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Acura 3.5RL, 2003 Acura 3.5RL, 2002 Acura 3.5RL, and 2001 Acura 3.5RL. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform PCM reset procedure. See PCM RESET PROCEDURE/CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Install SCS Service Connector (07PAZ-0010100) to Service Check Connector. See Figure . Test drive vehicle with no electrical load and A/T in D4 position. 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.
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