Section 2 (Engine Controls - Basic Diagnostic Procedures): Introduction

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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. For a no-start condition, verify events at time of failure to start.

Before entering self-diagnostics, perform a careful and complete visual inspection. Most engine control problems result from mechanical breakdowns, are, poor electrical connections or damaged/misrouted vacuum hoses. See VACUUM DIAGRAMS article to assist in identifying improperly routed vacuum hoses which cause driveability and/or computer-indicated malfunctions. Before condemning the computerized system, perform each test listed in this article.

NOTE: Perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure.