Engine Controls - System/Component Tests: Introduction

Before testing separate components or systems, perform basic diagnostic procedures in BASIC TESTING article. Since many computer controlled and monitored components set a Diagnostic Trouble Code (DTC) if they malfunction, also perform self-diagnostics in appropriate TESTS W/CODES article. See following list.

2.0L, see: TESTS W/CODES - TRIONIC SYSTEM .
2.3L, see: TESTS W/CODES - MOTRONIC 4.1 & 5.2 SYSTEM .
2.5L, see: TESTS W/CODES - MOTRONIC 4.1 & 5.2 SYSTEM .

NOTE: Testing of individual components does not isolate possible shorts or opens. Unless stated otherwise in testing procedures, perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) with minimum 10-megohm input impedance. Use ohmmeter to isolate wiring harness shorts or opens.