1990 Volkswagen Vanagon Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Idle Stabilization System (VANAGON)

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