Engine Controls - Self-Diagnostics - Turbo: Introduction

NOTE: All voltage tests should be performed using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless specifically stated otherwise in testing procedures.

If no faults were found while performing BASIC DIAGNOSTIC PROCEDURES - EXCEPT S40 & V40 , proceed with SELF-DIAGNOSTIC SYSTEM . If no DTCs or only pass DTCs are present, proceed to TROUBLE SHOOTING - NO CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).