Engine Controls - Basic Testing: Introduction

The following diagnostic steps will help prevent overlooking a simple problem. Also begin here to diagnosis a no-start condition.

First step in diagnosing any driveability problem is to verify customer's complaint by test driving vehicle under conditions problem reportedly occurred.

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