General Description; Transmission; Electronic Control Components View - Allison MD 3060 Troubleshooting Manual

W T E C I I E L E C T RO N I C C O N T RO L S T RO U B L E S H O OT I N G M A N UA L
1–1.

TRANSMISSION

The World Transmission Electronic Controls WTEC II system features closed-loop clutch control to provide
superior shift quality over a wide range of operating conditions. MD 3000 (except 3070), HD 4000, and B Series
configurations can be programmed to have up to six forward ranges, neutral, and one reverse range. The MD 3070
has seven forward ranges and one reverse range. Figures 1–1 and 1–2 show electronic control unit components.
WTEC II Electronic Controls consist of the following components:
Basic or Max Feature Electronic Control Unit (ECU)
•
• Pushbutton or Lever Shift Selectors (remote or integral to the ECU)
Optional Secondary Shift Selector
•
• Engine, Turbine and Output Speed Sensors
Throttle Position Sensor (TPS) (or electronic engine throttle signal or PWM signal)
•
• Control Module (Electro-Hydraulic Valve Body)
Wiring Harnesses
•
Vehicle Interface Module (VIM)
•
• Optional Retarder Controls
TransID Feature
•
NOTE: Model Year '94 and earlier WT Series Electronic Controls operate on 12VDC. Vehicles with a 24VDC
system require a voltage equalizer or converter to supply 12V to the electronic control system. Model
Year '95 and later transmissions operating on 24VDC require a 24V VIM and a 24V wiring harness
which includes shielding for the turbine and output speed sensors.
MD/B 300/B 400
RETARDER CONNECTOR
(INCLUDES OUTPUT
SPEED SENSOR)
MD 3070
TRANSFER CASE
CONNECTOR
HD/B 500
RETARDER
TEMPERATURE
SENSOR
CONNECTOR
HD/MD/B RETARDER
ACCUMULATOR "H"
SOLENOID
CONNECTOR
OUTPUT SPEED
SENSOR
TRANSMISSION
*CONNECTOR
CONNECTOR
ENGINE
SPEED
SENSOR
CONNECTOR
NOTE: Illustration is not to scale.
*All HD/B 500 models
All Non-Retarder MD/B 300/B 400 models
Figure 1–1. WTEC II Electronic Control Components (Units Produced Before 9/94)
S 1 — GENERAL DESCRIPTION
ECTION
VEHICLE
INTERFACE
MODULE
(VIM)
VEHICLE
INTERFACE
WIRING
(VIW)
CONNECTOR
OPTIONAL
BULKHEAD
CONNECTOR
HARNESS
TURBINE
SPEED
SENSOR
RETARDER "K"
CONNECTOR
CONNECTOR
(HD/B 500)
(HD/B 500)
Copyright © 1998 General Motors Corp.
INTEGRAL ECU/
SHIFT SELECTORS
REMOTE
ECU
RETARDER
MODULATION
REQUEST (RMR)
SENSOR CONNECTOR
REMOTE SERIAL
WIRING
INTERFACE
CONNECTOR
TPS
CONNECTOR
THROTTLE
POSITION
SENSOR
ELECTRONIC
CONTROL
UNIT
(ECU)
CONNECTORS
DIAGNOSTIC
DATA READER (DDR)
CONNECTOR
PRO-LINK
DIAGNOSTIC TOOL
J 38538-A
OPTIONAL
DEUTSCH DDR
CONNECTOR
REMOTE
LEVER SHIFT
SELECTOR
REMOTE
PUSHBUTTON SHIFT
SELECTOR
STRIP PUSHBUTTON
SHIFT SELECTOR
®
V01634
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