Allison B 400 User Manual

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)

Allison B 400 Specifications

General

Brand	Allison
Model	B 400
Category	Microphone system
Language	English

Summary

Safety Information

Important Safety Notice

Details crucial safety precautions and warnings for servicing transmission components.

Warnings, Cautions, and Notes

General Description

Electronic Control Unit (ECU)

Describes the ECU's function as the system's central microcomputer and its components.

Shift Selector

Definitions and Abbreviations

DO NOT SHIFT LIGHT

Diagnostic Data Reader

Describes the Pro-Link® 9000 diagnostic tool used for data retrieval and troubleshooting.

Abbreviations

Basic Knowledge

Basic Knowledge Required

Important Information in the Troubleshooting Process

Highlights critical information and precautions to observe before starting troubleshooting.

Beginning the Troubleshooting Process

Wire Check Procedures

Checking Opens, Shorts Between Wires, and Shorts-to-Ground

Provides procedures for testing wires for open circuits and shorts using a VOM.

Checking at Transmission Connector and Internal Harness

Details checks for opens, shorts, and shorts-to-ground at the transmission connector and internal harness.

Oil Level Sensor

Electronic Fluid Level Check (Shift Selector)

Electronic Fluid Level Check (Pro-Link® 9000)

Diagnostic Codes

Diagnostic Code Memory

Code Reading and Code Clearing

Details methods for reading and clearing diagnostic codes using the shift selector or Pro-Link®.

Diagnostic Code Response

Describes ECU responses to faults, providing for safe transmission operation.

Shift Selector Displays Related to Active Codes

Diagnostic Code List and Description

Provides a comprehensive list of WT Series diagnostic codes, their meanings, and effects.

Diagnostic Code Troubleshooting

Outlines the process for troubleshooting based on identified diagnostic codes.

General Troubleshooting of Performance Complaints

General Checks

Troubleshooting Performance Complaints

Provides a table correlating problems with probable causes and suggested remedies.

Appendices

Identification of Potential Circuit Problems

Checking Clutch Pressures

Details procedures for checking individual clutch pressures for mechanical/electrical diagnostics.

Solenoid and Clutch Chart

Wire/Connector Chart

Lists connector details, pin assignments, wire colors, and termination points for system components.

Connector Part Numbers, Terminal Part Numbers, Tool Part Numbers, and Repair Instructions

Throttle Position Sensor Adjustment

Details the procedure for adjusting the throttle position sensor for proper ECU communication.

Hydraulic Schematics

WT Wiring Schematics

Solenoid and Temperature Charts

Diagnostic Tree — WT Series Hydraulic System

Pro-Link® 9000 Diagnostic Data Reader Information

Explains the use and functions of the Pro-Link® 9000 diagnostic tool for system analysis.