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Engine Controls - Tests W/O Codes - Gasoline: Introduction

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 COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION section before disconnecting battery.

Before diagnosing symptoms or intermittent faults, perform steps in appropriate BASIC TESTING and TESTS W/CODES (if applicable) articles below in the ENGINE PERFORMANCE section. Use this article to diagnose driveability problems that exist when a fault code is not present.

NOTE: Some driveability problems may have been corrected by manufacturer with a revised Powertrain Control Module (PCM). Check with manufacturer for latest application.

Symptom checks can direct the technician to malfunctioning component(s) for further diagnosis. A symptom should lead to a specific component test, system test or adjustment specification.

NOTE: Malfunction Indicator Light (MIL) may also be referred to as CHECK ENGINE light.

Use intermittent test procedures to locate driveability problems that do not occur while the vehicle is being tested. These problems may noticeably affect driveability or cause Malfunction Indicator Light (MIL) to glow. Also use these test procedures if a soft (intermittent) trouble code was present but no problem is found during self-diagnostic testing.

NOTE: For specific testing procedures, see appropriate SYSTEM/COMPONENT TESTING article in the ENGINE PERFORMANCE section below . For specifications, see appropriate ADJUSTMENTS or SPECIFICATIONS article in the ENGINE PERFORMANCE section below.
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