Section 27 (Engine Controls - System & Component Testing): Introduction

WARNING: This page is about a different car, the 2003 Saturn LW300 and 2003 Saturn L300. However, it is still accessible from the selected car via links, so may be relevant.

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.