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Test NTC-10: Checking Minimum Idle Airflow

NOTE: For circuit identification, see WIRING DIAGRAMS article. After each repair procedure has been completed, reconnect all components. Perform TEST VER-5  to ensure system is functioning properly. Ensure no DTCs are present before performing this test.
  1. Turn ignition off. Check for binding throttle plate and linkage. Ensure throttle is fully closed (throttle against throttle stop). Repair throttle linkage as necessary. If throttle plate and linkage are okay, go to next step.
  2. Start engine and allow it to idle. Check engine, brake booster and vacuum hoses for leaks. Ensure Positive Crankcase Ventilation (PCV) system is functioning properly. See EMISSION SYSTEMS & SUB-SYSTEMS in appropriate SYSTEM & COMPONENT TESTING article. Repair vacuum leaks as necessary. If PCV system is okay and no vacuum leaks exist, go to next step.
  3. Turn ignition off. Disconnect PCV hose and cap fitting on PCV valve. Disconnect purge hose from fitting on throttle body. Start engine. Ensure all accessories are off. Allow engine to reach normal operating temperature. Using scan tool, select ENGINE SYSTEM TESTS, then MINIMUM AIR FLOW. Follow scan tool instructions and perform minimum airflow function. If engine speed is 550-1300 RPM, no problem is indicated at this time. Test is complete. If engine speed is not 550-1300 RPM, go to next step.
    WARNING: In the following step. clean throttle body in a well ventilated area. Wear rubber or butyl gloves. Do not let Mopar parts cleaner come in contact with eyes or skin. Wash thoroughly after using cleaner.
  4. Turn ignition off. Remove throttle body. See FUEL SYSTEMS in REMOVAL & INSTALLATION article. Holding throttle open, spray entire throttle body bore and manifold side of throttle plate with Mopar parts cleaner. Also clean Idle Air Control (IAC) motor passage. Using compressed air, blow dry throttle body. Reinstall throttle body. Install .125" Fixed Orifice Adapter (6457) to purge hose vacuum fitting on throttle body. Start engine. Ensure all accessories are off. Allow engine to reach normal operation temperature. Using scan tool, select ENGINE SYSTEM TESTS, then MINIMUM AIR FLOW. Follow scan tool instructions and perform minimum airflow function. If engine speed is 550-1300 RPM, no problem is indicated at this time. Test is complete. If engine speed is not 550-1300 RPM, replace throttle body.
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