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Home >> Audi >> 1982 >> 5000 Base, Standard Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Idle Speed Control >> Testing >> Air Control Valve System
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Air Control Valve System

  1. Warm engine to at least 122°F (50°C). Pull connector off control valve for idle stabilization. Turn ignition on and ensure battery voltage is present across terminals. If no voltage, go to step  3.
  2. Reconnect connector to control valve. Touch idle stabilization control valve and check for vibrations. If no vibrations, replace idle stabilization control valve.
  3. If no voltage, check for open wire. Turn on ignition. Connect voltmeter between contact 14 of socket 11 and contact 5 of socket 12 on relay plate. There should be about battery voltage. Turn air conditioner on. Check for 12 volts between contact 2 and socket 12 on relay plate and ground.
  4. Check for continuity between contact 11 of socket 11 and connector of idle stabilizer control valve. Check for continuity between contact 4 of socket 12 and connector of idle stabilizer control valve.
  5. Pull throttle valve switch connector apart. Check for 12 volts between harness side of connector and ground.
  6. Connect ohmmeter between throttle switch connector terminals. There should be continuity with throttle in idle position and infinity with throttle slightly open. If necessary, adjust or replace switch.
  7. Check for continuity between contact 13 of socket 11 and thermoswitch wire (brown black). If okay, but idle stabilization is not okay (engine RPM varies) replace control unit.
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