This Allison WTEC II troubleshooting manual (publication TS2470EN) is the factory reference for diagnosing electronic control faults on MD, HD, and B Series automatic transmissions equipped with WTEC II controls. It covers diagnostic codes, sensor testing, wiring harness repair, and throttle position sensor adjustment across 396 pages. Originally published May 1998 with Revision 1 dated October 1999.
Official Allison WTEC II troubleshooting document details
| Brand | Allison Transmission (Division of 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 no. | TS2470EN |
| Year / Revision | May 1998 / Revision 1, October 1999 |
| Pages | 396 |
| File size | 4.5 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 XX — Retarder Temperature Sensor, and others)
- Wire, Terminal, and Connector Repair Information
- Appendix D — Wire/Connector Chart (including VIM Connector diagrams)
- Appendix E — Parts Reference
- Appendix F — Throttle Position Sensor Adjustment
- Appendix P — PTO Operation and Schematics (Neutral Indicator for PTO, PTO Enable, Fast Idle Control)
- Temperature Sensor Chart — Temperature vs. Resistance tables
Applicable truck models
This manual applies to all vehicles equipped with Allison MD/HD/B Series transmissions using WTEC II electronic controls, including Pre-TransID and TID 1 configurations. Specific transmission models covered are the MD 3060, MD 3066, MD 3560, MD 3070PT, HD 4060, HD 4560, B 300, B 400, and B 500 — with (P) and (R) variants where applicable. These transmissions are widely installed in medium-duty and heavy-duty trucks, transit buses, school buses, and refuse vehicles. Vocations explicitly referenced include refuse packer and recycling truck applications with PTO fast idle control. External wiring harness components are sourced through St. Clair Technologies Inc. (SCTI). Companion service manuals SM2148EN and SM2457EN, and parts catalogs PC2150EN and PC2456EN, are referenced for additional mechanical service data. Visit Allison Transmission’s official website for current product support and service outlet locations.
Who needs this Allison WTEC II troubleshooting manual
Fleet mechanics, independent transmission shops, and municipal workshop technicians servicing vehicles with WTEC II-equipped Allison transmissions will use this manual daily for reading diagnostic codes, verifying sensor resistance values, tracing wiring schematics, and adjusting the throttle position sensor. It is essential for anyone performing electrical diagnostics on MD, HD, or B Series units in the field or on the bench.
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Applies to these truck models
This is the manufacturer document shared across 2 model families. It applies to:
- Allison
- Allison Manuals
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