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Allison MD 3066 User Manual

Allison MD 3066
396 pages
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TS2470EN
Printed in the U.S.A. Copyright © 1998 General Motors Corp.
Troubleshooting
Manual
Division of General Motors Corporation
P.O. Box 894 Indianapolis, Indiana 46206-0894
May 1998
Revision 1, 199910
Allison Transmission
MD/HD/B Series Transmissions
WTEC II Controls
(Pre-TransID and TID 1)
MD 3060/MD 3066/MD 3560(P)(R)
MD 3070PT
HD 4060/HD 4560(P)(R)
B 300/B 400/ B 500(P)(R)

Table of Contents

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Allison MD 3066 Specifications

General IconGeneral
BrandAllison
ModelMD 3066
CategoryMicrophone system
LanguageEnglish

Summary

Troubleshooting Manual

Important Safety Notice

Warnings, Cautions, and Notes

Explains the meaning of WARNING, CAUTION, and NOTE headings used in the manual.

Section 1: General Description

Electronic Control Unit (ECU)

Describes the ECU as the brain of the control system, its functions, and EEPROM.

Shift Selector Systems

Details pushbutton and lever shift selectors, their displays, indicators, and diagnostic access.

Sensors and Wiring Harnesses

Covers Throttle Position Sensor, Speed Sensors, and Wiring Harnesses.

Section 2: Definitions and Abbreviations

Diagnostic Data Reader (DDR)

Describes the Pro-Link® 9000 diagnostic tool for data transmission and ECU interrogation.

Section 3: Basic Knowledge

Basic Knowledge Required

Outlines essential electrical concepts, tool usage, and mechanical aptitude for servicing.

System Overview and Troubleshooting Process

Explains ECU control, fault detection, and crucial troubleshooting precautions.

Section 4: Wire Check Procedures

Checking Opens and Shorts

Provides procedures for using a VOM to check wire continuity and shorts.

Checking Transmission and Internal Harness Connections

Details checks for opens, shorts between wires, and shorts-to-ground at transmission connectors.

Section 5: Oil Level Sensor

Electronic Fluid Level Check Procedures

Covers checking fluid level using shift selector display and Pro-Link® diagnostic tool.

Section 6: Diagnostic Codes

Diagnostic Code Memory and Reading

Explains code logging, reading, clearing, and components like the DDR.

Diagnostic Code Responses and Displays

Explains ECU responses to faults and shift selector display indications for codes.

Diagnostic Code List and Troubleshooting

Provides a comprehensive list of diagnostic codes with descriptions and troubleshooting charts.

Specific Diagnostic Code Troubleshooting

Details troubleshooting steps for specific codes like ECU Input Voltage (13) and Oil Level Sensor (14).

Transmission Component Wiring Diagrams and Diagnostics

Section 7: Input and Output Functions

Section 8: General Troubleshooting of Performance Complaints

General Checks Before Troubleshooting

Lists crucial general checks to perform before specific troubleshooting, like battery and fluid levels.

Troubleshooting Performance Complaints

Addresses common performance issues like shift selector problems, no-start, and shifting faults.

Low Pressure Section

Details causes and remedies for low main pressure, clutch pressure, and lubrication pressure.

Overheating in All Ranges

Discusses causes of overheating, including cooler issues, fluid condition, and engine problems.

Appendices

Diagnostic and Troubleshooting Tools

Provides information on TPS adjustment, diagnostic trees, and Pro-Link® 9000 usage.

Appendix F: Throttle Position Sensor Adjustment

Throttle Position Sensor (TPS) Adjustment

Details the operation and adjustment procedure for the Throttle Position Sensor.

Appendix J: WT Wiring Schematics

Appendix M: Diagnostic Tree - WT Series Hydraulic System

Appendix N: Pro-Link® 9000 Diagnostic Data Reader Information

Preparing to Use the Pro-Link® 9000 Diagnostic Data Reader

Guides on connecting the Pro-Link® 9000, checking power, and cartridge installation.

Checking Transmission Fluid Level with Pro-Link®

Details how to check transmission fluid level using the Pro-Link® 9000 diagnostic tool.

Checking for Diagnostic Codes with Pro-Link®

Explains how to use the Pro-Link® 9000 to check and display diagnostic codes.

Clearing Diagnostic Codes

Provides instructions for clearing active and inactive diagnostic codes via the Pro-Link®.

Performing a Clutch Test

Details how to perform clutch tests using the Pro-Link® diagnostic tool and shift selector.

Appendix P: Input/Output Functions

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