Engine Control System - Basic Diagnostic Procedures: Introduction
Before proceeding with basic diagnostic procedures, ensure testing procedure is followed, as some systems which may result in a no-start condition may cause a Diagnostic Trouble Codes (DTC) to be stored in the Powertrain Control Module (PCM). See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 1.8L VIBE article.
If no-start condition still exists after checking and repairing all DTCs, perform a careful and complete visual inspection. See VISUAL INSPECTION under PRELIMINARY INSPECTION & ADJUSTMENTS. Many 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.
CAUTION:
When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See appropriate COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.
NOTE:
Perform all voltage tests with a Digital Multi-Meter (DMM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure.