TESTING

1. Disconnect the electrical harness to the air control valve while the engine is idling. Check and make sure the engine rpm drops.
2. Connect the air control valve harness, and make sure that the engine rpm returns to the original level.

   NOTE: Detaching the connector causes a change in the engine rpm when the engine is cold. However, when the engine is warm, it causes a smaller change or almost no change at all.

3. If the engine shows no rpm change, proceed as follows:
   1. Stop the engine, then disconnect the electrical harness from the air control valve.
   2. Turn the ignition switch to the ON position.
   3. Using a voltmeter, measure the voltage across power terminal BW on the air control valve connector and ground. The voltmeter should read 10 volts. If voltage obtained is less than specified, check the harness.
   4. Turn the ignition switch to the OFF position. Using an ohmmeter, measure the resistance between each terminal of the connector on the air control valve. The ohmmeter should read 7.3–13 ohms at −4–176°F (−20–80°C). If specifications are not as specified, replace the air control valve.
   5. Using an ohmmeter, measure the insulation resistance between each terminal of the connector on the air control valve and ground. The ohmmeter should read 1 mega-ohm. If the readings are not as specified, replace the air control valve.
   6. Connect the air control valve harness, then unfasten the control unit electrical harness.
   7. Turn the ignition switch to the ON position. Using a voltmeter, measure the voltage between terminal 45 (GR) of the control unit harness and ground. The voltmeter should read 10 volts. If the readings are not as specified, check the harness between the air control valve and the control unit.
   8. Turn the ignition switch to the OFF position, then attach the control unit connector.
   9. Monitor the voltage across terminal 45 (GR) on the control unit connector and ground, when the ignition switch is turned to the ON position. The voltmeter should read 1 volt for approximately 1 minute after the ignition switch is turned ON, and 10 volts after 1 minute. If the readings are not as specified, check for poor contact of the terminal or a faulty control unit.
   10. Turn the ignition switch to the OFF position, then disconnect the air control valve hose.
   11. Turn the ignition switch to the ON position. Look through the open end of the pipe (from which the air control valve was disconnected) and check that the valve moves from the fully closed position to the fully opened position, 1 minute after the ignition switch is turned to the ON position.