Engine Controls - Basic Testing: Introduction
NOTE:
Unless otherwise specified, references to "F" Series include "F" Series Super Duty.
The following diagnostic steps help prevent overlooking simple problems and begin diagnosis for no-start conditions.
The first step in diagnosing any driveability problem is verifying the customer's complaint by test driving vehicle under the conditions in which 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. Before condemning the computerized
system, perform each test listed in this article.
NOTE:
Unless otherwise instructed in test procedure, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance.