Engine Controls - System/Component Tests: Introduction

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