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Home >> Volvo >> 1995 >> 850 Base, 4D Sedan, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Turbo >> Diagnostic Trouble Code Testing >> MOTRONIC 4.3 Control System >> Code 2-3-3: Idle Air Trim

Code 2-3-3: Idle Air Trim

  1. If Volvo Scan Tool (998-8686 ) reads UPPER LIMIT, go to next step. If scan tool reads LOWER LIMIT, go to step 7).
  2. Operate engine at idle. Read off throttle position on scan tool. If throttle position is 3-8 degrees with throttle shut, go to next step. If throttle position is not 3-8 degrees with throttle shut, repair as necessary.
  3. Turn ignition off. Ensure air cleaner, air intake, and hoses and pipes between air cleaner and throttle body are not blocked. Also check connectors for IAC valve. If all components are okay, go to next step. If all components are not okay, repair as necessary.
  4. Turn ignition off. Disconnect IAC valve. Connect an ohmmeter between IAC connector terminals No. 1 and 3. If ohmmeter reads 18-28 ohms, go to next step. If ohmmeter does not read 18-28 ohms, retest using new IAC valve.
  5. Turn ignition off. Remove IAC valve. Hold valve at connector. Turn valve quickly (but carefully) back and forth. Listen for sound of slide striking.
    CAUTION: To prevent scratching and damage, do not touch slide with a screwdriver or similar tool.
  6. If slide in IAC valve strikes, clean IAC valve and ECM connectors of oxidation or other contact resistance. If slide does not strike, retest using new IAC valve.
  7. Run engine at idle. Using Volvo Scan Tool (998-8686 ), read off throttle position. If throttle position is 3-8 degrees with throttle closed, go to next step. If throttle position is not 3-8 degrees with throttle closed, adjust throttle angle.
  8. Turn ignition off. Check IAC valve and related components for air leakage. Repair as necessary. If no air leakage is present, go to next step.
  9. Turn ignition off. Disconnect IAC valve. Connect an ohmmeter between IAC valve connector terminal No. 1 and 3. If ohmmeter reads 18-28 ohms, go to next step. If ohmmeter does not read 18-28 ohms, retest using new IAC valve.
  10. Turn ignition off. Remove IAC valve. Hold valve at connector. Turn valve quickly (but carefully) back and forth. Listen for sound of slide striking.
    CAUTION: To prevent scratching and damage, do not touch slide with a screwdriver or similar tool.
  11. If slide in IAC valve strikes, clean IAC valve and ECM connectors of oxidation or other contact resistance. If slide does not strike, retest using new IAC valve.
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