LEMON Manuals: Even more car manuals for everyone
Home >> Volvo >> 1995 >> 850 GLT, 4D Sedan, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2 (Engine Controls - Tests W/Codes - Non-Turbo (A/T) - MOTRONIC 4.4) >> Circuit Tests >> DTC 233 - Idle Air Trim

DTC 233 - Idle Air Trim

WARNING: This page is about a different car, the 1996 Volvo 850. However, it is still accessible from the selected car via links, so may be relevant.
  1. If Volvo Scan Tool (998-8686 ) reads UPPER LIMIT, go to next step. If scan tool reads LOWER LIMIT, go to step 6).
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. Ensure seal on throttle body adjusting screw is good. Ensure throttle spindle is contacting adjustment screw and throttle pulley contact idling stop. Check intake system for air leakage. Repair as necessary. If components are okay, turn ignition on. Using scan tool, activate IAC valve. If a clicking sound is heard, go to next step. If no clicking sound is heard, check connectors for poor terminal contact. Repair as necessary. If terminal contact is okay, go to next step.
  7. 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.
  8. Turn ignition off. Remove fresh air intake between air cleaner and throttle body. Check throttle for damage. Repair as necessary. If throttle is not damaged, install new IAC valve.
scientia non olet · About LEMON Manuals