Introduction

INTRODUCTION
Chrysler engine control systems seem to have few problems in communicating with the scanner or entering self-diagnostic tests. Nevertheless, the logic module may fail to communicate with the scanner, or the system may not perform ATM or sensor tests.

If a problem exists with the wiring or other circuit parts on the vehicle, the scanner may not be able to communicate with the controller. The vehicle's failure to perform a test also can be an important symptom for diagnosing a driveability problem.