Engine Controls - Tests W/O Codes: Introduction
NOTE:
For specific testing procedures, see SYSTEM/COMPONENT TESTS
article. For specifications, see ADJUSTMENTS
or SPECIFICATIONS
article.
Before diagnosing symptoms or intermittent faults, perform BASIC DIAGNOSTIC PROCEDURES in BASIC TESTING and SELF-DIAGNOSTICS in TESTS W/CODES articles. Use this article to diagnose driveability problems existing when a hard fault code is not present.
Some driveability problems may have been corrected by manufacturer with a revised computer control unit. Check with manufacturer for latest computer application.
Symptom checks can direct the technician to malfunctioning components for further diagnosis. A symptom should lead to a specific component test, system test or an adjustment.