Engine Controls - Trouble Shooting - No Codes - EEC-V - Gasoline: Introduction

NOTE: This article covers 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, see TROUBLE SHOOTING - NO CODES - EEC-V (BI-FUEL) article.

NOTE: Some driveability problems may have been corrected by manufacturer with a revised Powertrain Control Module (PCM). Check with manufacturer for latest PCM application.

Before diagnosing symptoms or intermittent faults, perform basic diagnostic procedures in appropriate BASIC DIAGNOSTIC PROCEDURES article and perform QUICK TEST in SELF-DIAGNOSTICS - EEC-V (GASOLINE) article. Use this article to diagnose driveability problems existing when a hard fault code is not present.

Symptom checks can direct the technician to malfunctioning component(s) for further diagnosis. A symptom should lead to a specific component or system test and/or adjustment.

Use INTERMITTENT PROBLEM DIAGNOSIS under INTERMITTENTS to locate driveability problems that DO NOT occur when the vehicle is being tested. These test procedures should also be used if a soft (intermittent) trouble code was present, but no problem was found during self-diagnostic testing.

NOTE: For specific testing procedures, see appropriate SYSTEM & COMPONENT TESTING article. For specifications, see appropriate ON-VEHICLE ADJUSTMENTS or SERVICE & ADJUSTMENT SPECIFICATIONS article.