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Test NTC-9A: Checking Minimum Idle Airflow

NOTE: This test does not apply to 2.5L and 4.0L engines.
  1. Remove air cleaner. Disconnect vacuum hose from PCV valve. Install Vacuum Fitting (6714) in disconnected hose. Disconnect 3/16" EVAP hose from throttle side of body. Cap 3/16" nipple. Go to next step.
  2. Start engine. Allow engine to reach normal operating temperature. Using scan tool, actuate minimum idle airflow and wait for system to stabilize. If engine speed is 500-900 RPM, stop actuation test. Minimum idle airflow is normal. Test passed. If engine speed is not as specified, go to next step.
    WARNING: Clean throttle body in well ventilated area and wear rubber gloves.
  3. Stop actuation test. Turn engine off. Remove throttle body. While holding throttle open, spray entire throttle body bore with carburetor/throttle body cleaner. Using soft scuff pad, clean throttle body bore and throttle plate. Using compressed air, dry throttle body. Install throttle body and go to next step.
  4. Start engine. Using scan tool, actuate minimum idle airflow. If engine speed is 500-900 RPM, stop actuation test. Minimum idle airflow is normal. Test passed. Perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES  on AB body, or TEST VER-2A: ROAD TEST VERIFICATION  on all other bodies. If engine speed is not as specified, replace throttle body and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES  on AB body, or TEST VER-2A: ROAD TEST VERIFICATION  on all other bodies.
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