Engine Controls - Basic Testing - Diesel: Introduction

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

The first step in diagnosing any driveability problem is verifying the customer's complaint with a test drive under conditions during which the problem reportedly occurred.

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