WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL FOREWORD — How to Use This Manual This manual provides troubleshooting information for Allison Transmission Division, MD/HD/B Series On-Highway Transmissions. Service Manuals SM2148EN and SM2457EN, plus Parts Catalogs PC2150EN and PC2456EN may be used in conjunction with this manual. This manual includes: Description of the WTEC III electronic control system. Description of the electronic control system components. Description of diagnostic codes, system responses to faults, and troubleshooting. Wire, terminal, and connector repair information.
Specific instructions for using many of the available or required service tools and equipment are not included in this manual. The service tool manufacturer will furnish instructions for using the tools or equipment. 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. Please use these SILs to obtain up-to-date information concerning Allison Transmission products. This publication is revised periodically to include improvements, new models, special tools, and procedures. A revision is indicated by a new date on the title page and in the lower left corner of the rear cover.
Check with your Allison Transmission service outlet for the currently applicable publication. Additional copies of this publication may be purchased from authorized Allison Transmission service outlets. Look in your telephone directory under the heading of Transmissions — Truck, Tractor, etc. Take time to review the Table of Contents and the manual. Reviewing the Table of Contents will aid you in quickly locating information. NOTE: Allison Transmission is providing for service of wiring harnesses and wiring harness components as follows:
Repair parts for the internal wiring harness and for wiring harness components attached to the shift selector will be available through the Allison Transmission Parts Distribution Center (PDC). Use the P/N from your appropriate parts catalog or from Appendix E in this manual. Allison Transmission is responsible for warranty on these parts. Repair parts for the external harnesses and external harness components must be obtained from St. Clair Technologies Inc. (SCTI). SCTI provides parts to any Allison customer or OEM and is responsible for warranty on these parts. SCTI recognizes ATD, manufacturers, and SCTI part numbers. SCTI provides a technical HELPLINE at 519-627-1673 (Wallaceburg).
SCTI will have parts catalogs available. The SCTI addresses and phone numbers for parts outlets are: St. Clair Technologies, Inc. 1050 Old Glass Road Wallaceburg, Ontario, Canada, N8A 3T2 Phone: (519) 627-1673 Fax: (519) 627-4227 St. Clair Technologies, Inc. 1111 Mikesell Street Charlotte, Michigan 48813 Phone: (517) 541-8166 Fax: (517) 541-8167 St. Clair Technologies, Inc. c/o Mequilas Tetakawi Carr. Internationale KM 1969 Guadalajara – Nogales, KM2 Empalme, Sonora, Mexico Phone: 011-52-622-34661 Fax: 011-52-622-34662 St. Clair Technologies, Inc. stocks a WTEC III external harness repair kit, P/N 29532362, as a source for some external harness repair parts.
SCTI is the source for external harness repair parts. ii Copyright © 2001 General Motors Corp.