NOTE: Allison Transmission is providing for service of WTEC II wiring harnesses and wiring harness components as follows: (See Service Information Letter 1-WT-97 for further information.) Reviewing the Table of Contents will aid you in quickly locating information. Take time to review the Table of Contents and the manual. Look in your telephone directory under the heading of Transmissions - Truck, Tractor, etc. Additional copies of this publication may be purchased from authorized Allison Transmission service outlets. Check with your Allison Transmission service outlet for the currently applicable publication. A revision is indicated by a letter suffix added to the publication number. This publication is revised periodically to include improvements, new models, special tools, and procedures. Please use these SILs to obtain up-to-date information concerning Allison Transmission products. Additional information may be published from time to time in Service Information Letters (SIL) and will be included in future revisions of this and other manuals. The service tool manufacturer will furnish instructions for using the tools or equipment. Specific instructions for using many of the available or required service tools and equipment are not included in this manual. Wire, terminal, and connector repair information. Description of diagnostic codes, system responses to faults, and troubleshooting.Description of the electronic control system components.Description of the WTEC II electronic control system.Service Manuals SM2148EN and SM2457EN, and Parts Catalogs PC2150EN and PC2456EN may be used in conjunction with this manual. This manual provides troubleshooting information for Allison Transmission (AT), MD/HD/B Series Transmissions. WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL ii Copyright © 2005 General Motors Corp.
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