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Test NTC-9A: Checking Minimum Idle Airflow

NOTE: Perform TEST NTC-1A  or TEST NTC-8A  before proceeding.
  1. Turn ignition off. Disconnect PCV valve hose from PCV valve. Attach Orifice (6457) (orifice size is .125") to PCV valve hose. Disconnect 3/16" idle purge hose from throttle body. Plug 3/16" nipple on throttle body.
  2. Start engine. Allow engine to reach normal operating temperature. Using scan tool, actuate minimum airflow. If throttle body minimum airflow idle RPM is not 500-1000 RPM, go to next step. If throttle body minimum airflow idle RPM is 500-1000 RPM. Using scan tool, stop minimum airflow actuation. Minimum airflow is normal. Test is complete.
  3. Using scan tool, stop minimum airflow actuation. Turn engine off. Remove throttle body. With throttle fully open on throttle body, clean throttle body with parts cleaner. Using soft brush or pad, ensure throttle body bore and throttle plate are clean. Dry throttle body with compressed air.
  4. Reinstall throttle body. Recheck throttle body minimum airflow. If throttle body minimum airflow idle RPM is 500-1000 RPM, throttle body is okay. Test is complete. Perform TEST VER-2A . If throttle body minimum airflow idle RPM is not 500-1000 RPM, replace throttle body. Perform TEST VER-2A .
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