Engine Controls - System/Component Tests - 4-CYL: Introduction

Since many computer-controlled and monitored components set a trouble code if they malfunction, also perform 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.