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Home >> Acura >> 2001 >> 3.2CL Base >> Repair and Diagnosis (Single Page) >> External Pages >> Different car >> Section 17 (Engine Performance System Self-Diagnostics) >> Diagnostic Tests >> DTC P0506: Idle Control System Rpm Lower Than Expected (2004 3.5RL) >> Diagnostic Procedure
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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. Start engine. Hold engine speed at 3000 RPM with no load and transmission in Park or Neutral until radiator fan comes on, then allow engine to idle. Using scan tool, check idle speed under no-load conditions (all accessories off). If idle speed is 600-700 RPM, problem is intermittent. System is okay at this time. If idle speed is not 600-700 RPM, go to next step.
  2. Disconnect IAC valve 2-pin connector. If engine speed drops or engine stalls, adjust base idle speed. If base idle speed cannot be adjusted, clean ports in throttle body. If engine speed does not drop, replace IAC valve.
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