Engine Controls - System & Component Testing: Introduction

To properly diagnose and repair this vehicle, follow testing procedure in SELF-DIAGNOSTICS -- ALLANTE article. If no DTCs are present and a driveability condition exists, proceed to TROUBLE SHOOTING - NO CODES -- ALLANTE 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 using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use ohmmeter to isolate wiring harness shorts or opens.