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HOMESERVICE MANUALSACURA20043.5RLREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 45 (COMPUTER RELEARN PROCEDURES)IDLE LEARN PROCEDURE
2004 Acura 3.5RL

Idle Learn Procedure

2004 Acura 3.5RLSECTION Idle Learn Procedure
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 Acura RSX, 2003 Acura NSX-T, 2003 Acura NSX, 2003 Acura MDX, and 2003 Acura 3.5RL. However, it is still accessible from the selected car via links, so may be relevant.

All Acura models with programmed fuel injection (PGM-FI) have the ability to learn and adjust the engine idle speed to optimize engine idle characteristics. The idle learn procedure should be done whenever you do any of these actions:

  • Reset, replace, unplug, or reprogram the ECM/ PCM.
  • Disconnect or replace the battery.
  • Do engine work that requires removal and replacement of the intake manifold or the throttle body.
To allow the ECM/PCM adaptive idle speed system to learn and adjust the engine idle speed, follow this procedure:
  1. Make sure all electrical items (A/C, audio unit, defogger, lights, etc.) are turned off, then start the engine.
  2. Let the engine reach its normal operating temperature (the cooling fans cycle twice; the coolant temperature is about 194° F).
  3. Let the engine idle for at least 5 minutes with the throttle fully closed and with all electrical items turned off.
  4. If the cooling fans cycle on while doing an adaptive idle learn, add the time the cooling fans are on to the 5 minute adaptive idle learn time.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.