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1.0 INTRODUCTION The procedures contained in this manual include specifications, instructions, and graphics needed to Please follow the recommendations below when choosing your diagnostic path. 1. First make sure the DRBIII t is communicating with the appropriate modules; ie., if the DRBIII t displays a “No Response” condition, you must 2. Read DTC’s (diagnostic trouble codes) with the DRBIII t. 3. If no DTC’s are present, identify the customer complaint. 4. Once the DTC or customer complaint is identi- fied, locate the matching test in the Table of All component location views are in Section 8.0. All connector pinouts are in Section 9.0. All system An * placed before the symptom description indi- cates a customer complaint. When repairs are required, refer to the appropri- ate service manual for the proper removal and Diagnostic procedures change every year. New diagnostic systems may be added; carryover sys- After using this book, if you have any comments or recommendations, please fill out the form at the 1.1 SIX-STEP TROUBLESHOOTING Diagnosis of the AW4 electronic transmission system is done in six basic steps: • verification of complaint • verification of any related symptoms • symptom analysis • problem isolation • repair of isolated problem • verification of proper operation 2.0 IDENTIFICATION OF All 2001 Jeep Cherokees (XJ) vehicles equipped with a 4.0 liter engine and automatic transmission 3.0 SYSTEM DESCRIPTION AND 3.1 GENERAL DESCRIPTION The AW4 electronic transmission is a conven- tional transmission in that it uses hydraulically The AW4 transmission control system has im- proved significantly since it’s introduction. The An Input Speed Sensor (ISS) was added to the control system. This gives improved functional 3.2 FUNCTIONAL OPERATION The AW4 system performs it’s functions based on continuous real-time sensor feedback information. The only transmission functions that may be available are: • Park and Neutral • Reverse 1 GENERAL INFORMATION |