Engine Controls - Tests W/O Codes - 7.3L Diesel: Introduction

Before diagnosing symptoms or intermittent faults, perform SELF-DIAGNOSTIC TESTS in the TESTS W/CODES - 7.3L DIESEL article. If any codes are present, service codes as necessary. 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 component and code testing procedures, see the TESTS W/CODES - 7.3L DIESEL article. For adjustment procedures, see ADJUSTMENTS - 7.3L DIESEL For specifications, see SPECIFICATIONS - 7.3L DIESEL