This WTEC II troubleshooting Chung manual provides complete diagnostic and repair procedures for MD/HD/B Series automatic transmissions equipped with WTEC II electronic controls. Published by Allison Transmission (Division of General Motors Corporation) as publication TS2470EN, the 396-page document covers Pre-TransID and TID 1 control systems with detailed fault code descriptions, schematic drawings, and sensor calibration data.
Official WTEC II troubleshooting Chung document details
| Brand | Allison Transmission (General Motors) |
| 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 no. | TS2470EN |
| Year / Revision | May 1998, Revision 1 (October 1999) |
| Pages | 396 |
| File size | 5.2 MB |
| Format | |
| Language | English |
Document table of contents
- Foreword — How to Use This Manual
- Important Safety Notice — Warnings, Cautions, and Notes
- Description of the WTEC II Electronic Control System
- Description of Electronic Control System Components
- Diagnostic Codes — System Responses to Faults and Troubleshooting
- Code 21 XX — Throttle Position Sensor Fault or Adjustment
- Code 61 XX — Retarder Over Temperature
- Code 62 — Retarder Temperature Sensor
- Temperature Sensor Chart — Temperature vs. Resistance
- Appendix D — Wire/Connector Chart (VIM Connector, Harness 30-Way)
- Appendix E — Parts Reference
- Appendix F — Throttle Position Sensor Adjustment
- Appendix P — PTO Control Schematics and Vocational Applications
- Wire, Terminal, and Connector Repair Information
Applicable truck models
This manual applies to all vehicles equipped with Allison MD Series (MD 3060, MD 3066, MD 3560, MD 3070PT), HD Series (HD 4060, HD 4560), and B Series (B 300, B 400, B 500) transmissions using WTEC II electronic controls. Vocational applications referenced include refuse packers and recycling trucks with PTO fast-idle control configurations. External wiring harness components are sourced through St. Clair Technologies Inc. (SCTI). Companion service references include Service Manuals SM2148EN and SM2457EN, and Parts Catalogs PC2150EN and PC2456EN. For current product support, visit Allison Transmission’s official website.
Who needs this WTEC II troubleshooting Chung manual
Fleet mechanics, independent transmission shops, and workshop owners servicing medium-duty and heavy-duty trucks with WTEC II controls will use this manual daily for reading diagnostic codes, tracing wiring faults through ECU schematic drawings, and performing throttle position sensor adjustments.
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