Section 135 (Engine Controls - Tests W/O Codes - EEC-IV): Introduction

WARNING: This page is about a different car, the 1995 Ford Aerostar. However, it is still accessible from the selected car via links, so may be relevant.

Before diagnosing symptoms or intermittent faults, perform steps in BASIC TESTING and TESTS W/CODES -EEC-IV articles below. 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 procedures, see I - SYSTEM & COMPONENT TESTING article below. For specifications, see ADJUSTMENTS or C- SPECIFICATIONS article below.