Engine Controls - Tests W/O Codes: Introduction

NOTE: Information is not available for vehicles equipped with ME-SFI system.

Before diagnosing symptoms or intermittent faults, perform steps in TESTS W/CODES article. Use this article to diagnose driveability problems existing when a hard fault code is not present.

NOTE: 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 component(s) for further diagnosis. A symptom should lead to a specific component test, system test or an adjustment.

Use intermittent test procedures to locate driveability problems that DO NOT occur when the vehicle is being tested. These test procedures should also be used if a soft (intermittent) trouble code was present, but no problem was found during self-diagnostic testing.

NOTE: For specific testing procedures, refer to the SYSTEM & COMPONENT TESTING - GASOLINE article. For specifications, see ADJUSTMENTS or the SPECIFICATIONS article.