1989 Volkswagen Fox BaseFACTORY OEM SERVICE PROCEDURE

Idle Stabilization System (VANAGON)

  1. Attach Test Meter (VW 1315/2) and Adapter (US 1119) to idle stabilization valve. See Figure . Set meter to milliamp scale. Start engine. Observe meter while turning A/C control switch to the "ON" position. If milliamp reading increases, system is okay.
  2. If milliamp reading does not increase, turn ignition coil off. Connect LED test light between terminal No. 2 and terminal No. 5 of idle stabilization control unit connector. See Fig 1 . Start engine and cycle A/C switch on and off.
    Fig 1: Vanagon Idle Stabilization System Control Unit
    G121514Courtesy of VOLKSWAGEN UNITED STATES, INC.
  3. Test light should be on when A/C switch is in the "ON" position. If okay, replace idle stabilization control valve. If light does not go on, repair wiring between idle stabilization control unit terminal No. 2 and A/C compressor clutch.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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