This II troubleshooting Chung manual provides complete diagnostic code descriptions, wiring schematics, and fault-tracing procedures for MD/HD/B series automatic transmissions equipped with WTEC II electronic controls. Published by Allison Transmission (General Motors Corporation), the 406-page document targets technicians who maintain or repair Pre-TransID and TID 1 control systems in medium-duty and heavy-duty commercial vehicles.
Official II troubleshooting Chung document details
| Brand | Allison Transmission (General Motors Corporation) |
| Model coverage | MD 3060, MD 3066, MD 3560(P)(R), MD 3070PT, HD 4060, HD 4560(P)(R), B 300, B 400, B 500(P)(R) |
| System / Group | WTEC II Electronic Controls (Pre-TransID and TID 1) |
| Publication number | TS2470EN |
| Year / Revision | Original 1998 May; Rev. 1 October 1999; Rev. 2 July 2004; Rev. 3 December 2005 |
| Pages | 406 |
| File size | 5.1 MB |
| Format | |
| Language | English |
Document table of contents
- Preface and Foreword — How to Use This Manual
- Description of the WTEC II Electronic Control System
- Description of Electronic Control System Components
- Diagnostic Codes, System Responses to Faults, and Troubleshooting (Codes 14 XX through 62 XX and beyond)
- Wire, Terminal, and Connector Repair Information
- Appendix D — Wire/Connector Chart (including Ford, Freightliner bulkhead connectors)
- Appendix E — Connector Part Numbers, Terminal Part Numbers, Tool Part Numbers, and Repair Instructions
- Appendix P — PTO Controls, Neutral Indicator for PTO, and Fast Idle Operation
Applicable truck models
The manual applies to all vehicles fitted with Allison MD, HD, or B series automatic transmissions using WTEC II controls. Covered transmission models include MD 3060, MD 3066, MD 3560, MD 3070PT, HD 4060, HD 4560, B 300, B 400, and B 500 — with P and R suffix variants where applicable. OEM-specific wiring details are provided for Ford and Freightliner chassis, and external harness components are sourced through St. Clair Technologies Inc. (SCTI). Companion references include Service Manuals SM2148EN and SM2457EN and Parts Catalogs PC2150EN and PC2456EN. For the latest product information, visit Allison Transmission’s official website.
Who needs this II troubleshooting Chung manual
Fleet mechanics, independent transmission shops, and workshop owners who service medium-duty and heavy-duty trucks equipped with WTEC II controls will find this manual essential. It covers diagnostic code interpretation, ECU connector inspection, oil level sensor testing, retarder temperature sensor circuits, sump temperature sensor resistance charts, and PTO enable wiring — everything needed to isolate electrical and electronic faults without unnecessary parts replacement.
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