Section 12 (Engine Controls - Basic Testing - 1.8L 4-CYL): 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 customer's complaint 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 mechanical breakdowns, poor electrical connections or damaged/misrouted vacuum hoses. See VACUUM DIAGRAMS - 1.8L 4-CYL article. Before condemning computerized system, perform every test in this article.