Engine Controls - System & Component Testing: Introduction

Before testing separate components or systems, follow proper workflow. See DIAGNOSTIC STARTING POINT - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 3.0L SATURN "L" SERIES article. If no Diagnostic Trouble Codes (DTC) are present and a no-start condition exists, see NO-START DIAGNOSIS in BASIC DIAGNOSTIC PROCEDURES - 3.0L SATURN "L" SERIES article. If no DTCs are present and a driveability condition exists, see SYMPTOMS in TROUBLE SHOOTING - NO CODES - 3.0L SATURN "L" SERIES article for diagnosis by symptom (i.e., ROUGH IDLE, ENGINE STALLS, etc.).

NOTE: Testing individual components does not isolate shorts or opens. Perform all voltage tests with a Digital Volt-ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use DVOM to isolate wiring harness shorts or opens.