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Home >> Audi >> 1994 >> 90 CS Quattro >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Self-Diagnostic System >> Engine Basic Setting (ECM "B") >> Display Group 04, Field 2, Learning Value Of IAC Valve

Display Group 04, Field 2, Learning Value Of IAC Valve

  1. Displayed value should be +10 to -20 (A/T) or +14 to -16 (M/T). If displayed value exceeds negative (-) specification, go to step 3). If displayed value exceeds positive (+) specification, check codes and see DISPLAY GROUP 17, FIELD 3, or DISPLAY GROUP 18.
  2. Turn off all electrical accessories. Turn steering wheel to center position. Shift transmission into Park or Neutral. After one minute, displayed value must change. Check for faulty EGR control solenoid valve, faulty IAC valve or plugged vacuum booster (A/T).
  3. Check codes and see DISPLAY GROUP 18. Check for faulty IAC valve, intake air leak, faulty TP sensor stop or air leak in 2nd stage of throttle body.
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