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Home >> Volkswagen >> 1993 >> Passat GL, 2.0 B, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - VR6 >> Idle Control System >> Idle Air Control Valve >> Passat GLX (2.8L)
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Passat GLX (2.8L)

  1. Connect Scan Tester (VAG 1551) to Data Link Connectors (DLC) located in center console, in front of shift lever. With scan tester in OUTPUT DIAGNOSTIC TEST MODE, test Idle Air Control (IAC) valve. For more information, see the TESTS W/CODES article in this section.
  2. To check Idle Air Control (IAC) valve triggering circuit, turn ignition off. Disconnect wiring harness connector from idle air control valve. Connect LED Tester (US 1115) to wiring harness connector terminals No. 1 and 2.
  3. Turn ignition on. Perform OUTPUT DIAGNOSTIC TEST MODE until IAC valve is triggered. LED tester must flash. If LED tester does not flash, check IAC valve circuit.
  4. If LED tester flashes, disconnect wiring harness connector from idle air control valve. Using Test Leads from Adapter Kit (VW 1594), connect DVOM to IAC valve terminals No. 1 and 2. IAC valve resistance must be 10-20 ohms. If resistance is incorrect, replace IAC valve.
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