Allison WTEC III Electronic Controls Troubleshooting Manual for MD/HD/B Series Transmissions (EN)

TS2973EN TITLE PAGE

TS2973EN Troubleshooting Manual Allison On-Highway MD/HD/B Series Transmissions WTEC III Controls (TransID 1, 2, and 3) 3000MH MD 3060/MD 3066/MD 3560(P)(R) MD 3070PT 4000MH HD 4060/HD 4070/4076/HD 4560(P)(R) B 300/B 400/B 500(P)(R) 2001 June Printed in the U.S.A. Copyright © 2001 General Motors Corp. Division of General Motors Corporation P.O. Box 894 Indianapolis, Indiana 46206-0894 www.allisontransmission.com Division of General Motors Corporation P.O. Box 894 Indianapolis, Indiana 46206-0894 www.allisontransmission.com

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FOREWORD — HOW TO USE THIS MANUAL

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.

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WARNINGS, CAUTIONS, AND NOTES

WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL IMPORTANT SAFETY NOTICE IT IS YOUR RESPONSIBILITY to be completely familiar with the warnings and cautions used in this manual. These warnings and cautions advise against using specific service procedures that can result in personal injury, equipment damage, or cause the equipment to become unsafe. These warnings and cautions are not exhaustive. Allison Transmission could not possibly know, evaluate, or advise the service trade of all conceivable procedures by which service might be performed or of the possible hazardous consequences of each procedure. Consequently, Allison Transmission has not undertaken any such broad evaluation.

Accordingly, ANYONE WHO USES A SERVICE PROCEDURE OR TOOL WHICH IS NOT RECOMMENDED BY ALLISON TRANSMISSION MUST first be thoroughly satisfied that neither personal safety nor equipment safety will be jeopardized by the service proce- dures used. Also, be sure to review and observe WARNINGS, CAUTIONS, and NOTES provided by the vehicle manufacturer and/or body builder before servicing the Allison transmission in that vehicle. Proper service and repair is important to the safe and reliable operation of the equipment. The service procedures recommended by Allison Transmission and described in this manual are effective methods for performing troubleshooting operations.

Some procedures require using specially designed tools. Use special tools when and in the manner recommended. The WARNINGS, CAUTIONS, and NOTES in this manual apply only to the Allison transmission and not to other vehicle systems which may interact with the transmission. Be sure to review and observe any vehicle system information provided by the vehicle manufacturer and/or body builder at all times the Allison transmission is being serviced. WARNINGS, CAUTIONS, AND NOTES Three types of headings are used in this manual to attract your attention: NOTE: Is used when an operating procedure, practice, etc., is essential to highlight. Copyright © 2001 General Motors Corp. iii WARNING!

Is used when an operating procedure, practice, etc., which, if not correctly followed, could result in injury or loss of life. CAUTION: Is used when an operating procedure, practice, etc., which, if not strictly observed, could result in damage to or destruction of equipment.

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SHIFT SELECTOR TERMS AND DISPLAY INDICATIONS

WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL TRADEMARKS USED IN THIS MANUAL The following trademarks are the property of the companies indicated: ATDT TM is a trademark of General Motors Corporation. DEXRON ® is a registered trademark of General Motors Corporation. LPS ® Cleaner is a registered trademark of LPS Laboratories. Loctite ® is a registered trademark of the Loctite Corporation. Teflon ® is a registered trademark of the DuPont Corporation. Pro-Link ® is a registered trademark of MicroProcessor Systems, Inc. TranSynd TM is a trademark of Castrol Ltd. SHIFT SELECTOR TERMS AND DISPLAY INDICATIONS Shift selector terms and displays are represented in this manual as follows:

Button Names — , , “display mode”, MODE , etc. Transmission Ranges — D (Drive), N (Neutral), R (Reverse), 1 (First), 2 (Second), etc. Displays — “ o , L o , K ”, etc. (Display occurs one character at a time.) iv Copyright © 2001 General Motors Corp.

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