Engine Controls - Basic Engine Testing - 3.0L: Introduction

The following diagnostic steps will help prevent overlooking a simple problem. This is also where to begin diagnosis for a no-start condition.

The first step in diagnosing any driveability problem is verifying the symptom(s) with a test drive under the conditions the problem reportedly occurred.

Before entering self-diagnostics, perform a careful and complete visual inspection. Most engine control problems result from poor electrical connections, damaged/misrouted vacuum hoses or mechanical breakdowns. Before condemning the computerized system, perform each test listed in this article.

This article covers EEC and EEC-V equipped vehicle. For identification purposes, Aspire 1.3L and Probe 2.5L are equipped with EEC management. All other vehicles are equipped with EEC-V and can be identified by 104-pin PCM connector.