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Corrado SLC & Passat

  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 IAC valve. See TESTS W/CODES article in the ENGINE PERFORMANCE Section.
  2. To check 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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