This Allison WTEC III troubleshooting manual provides complete diagnostic code descriptions, electronic control system component details, and step-by-step fault isolation procedures for Allison 3000 and 4000 Product Family vocational transmissions. Published as TS2973EN (October 2005, revised October 2006), the document spans 443 pages and is intended for technicians servicing vehicles equipped with the WTEC III electronic control system.
Official Allison WTEC III troubleshooting document details
| Brand | Allison Transmission (General Motors Corporation) |
| Model coverage | 3000 and 4000 Product Families — see applicable models below |
| System / Group | WTEC III Electronic Controls |
| Publication no. | TS2973EN |
| Year / Revision | October 2005, Rev. 1 October 2006 |
| Pages | 443 |
| File size | 5.3 MB |
| Format | |
| Language | English |
Document table of contents
- Preface and Foreword — How to Use This Manual
- Description of the WTEC III Electronic Control System
- Description of Electronic Control System Components
- Diagnostic Codes — System Responses to Faults and Troubleshooting (Code 14 XX Oil Level Sensor, Code 21 Throttle Position Sensor, Code 66 Serial Communication Interface, and others)
- Wire, Terminal, and Connector Repair Information
- Appendix E — Connector Part Numbers, Terminal Part Numbers, Tool Part Numbers, and Repair Instructions
- Appendix P — Input/Output Functions (Reverse Enable, Direction Change Enable, Shift In Process, Anti-Lock Brake Response, Retarder Enable, Service Brake Status, Kickdown, and more)
- Appendix R — 4th Generation J1939 Message and Parameter Received Overview (V9-1 through V9C software versions)
Applicable truck models
The manual covers the full range of Allison 3000 series vocational models including 3000 HS, 3000 RDS, 3000 EVS, 3000 MH, 3000 PTS, 3000 TRV, 3200 SP, 3200 TRV, 3500 SP, 3500 RDS, 3500 EVS, 3700 SP, MD 3060, MD 3066, MD 3560, and MD 3070PT. It also covers all Allison 4000 series vocational models: 4000 EVS, 4000 HS, 4000 MH, 4000 RDS, 4000 TRV, 4500 EVS, 4500 HS, 4500 RDS, 4500 SP, 4500 TRV, 4700 EVS, 4700 RDS, 4800 EVS, HD 4060, HD 4060P/R/PR, HD 4560, HD 4560P/R/PR, HD 4070, HD 4070P/R/PR, HD 4076, plus bus models B 300, B 400, B 500 series and T 200, T 300, T 425, and T 450. Companion service manuals SM2148EN and SM2457EN, and parts catalogs PC2150EN and PC2456EN, are referenced for mechanical repair. For official product information visit Allison Transmission.
Who needs this Allison WTEC III troubleshooting manual
Fleet maintenance technicians, independent truck repair shops, and workshop owners working on vehicles with Allison 3000/4000 automatic transmissions need this manual to diagnose ECU faults, interpret diagnostic codes, verify throttle position and oil level sensor circuits, perform J1939 datalink troubleshooting, and carry out connector and terminal repairs using specified tools such as crimping tool J 35606.
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