Except Calif.

Remove air control valve, located on end of air intake chamber on passenger's side. Air control valve may also be identified using appropriate illustration in the THEORY/OPERATION article or wire color. See wiring diagram in the WIRING DIAGRAMS article.
Using ohmmeter, check resistance and for continuity between air control valve electrical terminals. Replace air control valve if resistance is not 30-33 ohms.
Ensure no continuity exists between each electrical terminal and air control valve body. Test air control valve operation by applying air pressure to designated area and checking air passage, and then applying battery voltage and ground and retesting. See Fig 1. Replace air control valve if defective or continuity exists between electrical terminals and air control valve body.

Fig 1: Testing Air Control Valve (Except Calif.)