Engine Controls Tests W/O Codes - 7.5L EEC-IV: Introduction

NOTE: This article covers 7.5L with Federal emissions.

Before diagnosing symptoms or intermittent faults, perform basic diagnostic procedures in the BASIC TESTING - 7.5L article and self-diagnostic steps in the TESTS W/CODES - 7.5L article. Use this article to diagnose existing driveability problems when there are no trouble codes present.

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

Symptom checks can direct the technician to malfunctioning component(s) for further diagnosis. A symptom should lead to a specific component or system test and/or 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 continuous memory (intermittent) trouble code was present, but no problem was found during KOEO or KOER SELF-TEST.

NOTE: For specific testing, see SYSTEM/COMPONENT TESTS - 7.5L article. For specifications, see the ADJUSTMENTS - 7.5L or SPECIFICATIONS articles.