Engine Controls - System/Component Tests: Introduction

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Since many computer-controlled and monitored components set a trouble code if they malfunction, also perform test procedures in the TESTS W/CODES article. In most instances, Scan Tester (VAG 1551) must be used to test systems and/or components. See ENTERING SELF-DIAGNOSTICS in the TESTS W/CODES article for additional scan tester operating instructions. See Figure .