Section 1789 (Engine Controls Self-Diagnostics - EEC-V - CNG & Gasoline - Introduction, Self-Diagnostic System, Additional System Functions, Programming Pcm, Diagnostic Trouble Code Definitions, How To Use System Tests): Introduction

WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2001 Mercury Sable, 2001 Mercury Mountaineer, 2001 Mercury Grand Marquis, 2001 Mercury Cougar, and 2001 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Information for Escort applies to Escort ZX2 unless otherwise indicated.

NOTE: This article covers CNG, gasoline and flex-fuel vehicles with EEC-V systems only. For Bi-Fuel (CNG and GASOLINE, or LPG and GASOLINE) vehicles with EEC-V systems, go to SELF-DIAGNOSTICS - EEC-V - BI-FUEL article.

Perform all basic diagnostic procedures in appropriate BASIC DIAGNOSTIC PROCEDURES article. If no fault is found while performing basic diagnostic procedures, proceed with self-diagnostics. If no Diagnostic Trouble Codes (DTCs) or only pass codes are found during self-diagnostics and symptom is present, proceed to TROUBLE SHOOTING - NO CODES - EEC-V - CNG & GASOLINE article for diagnosis by symptom.