Vehicle Interface Module; Transid Feature - 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
1–8. VEHICLE INTERFACE MODULE (Figure 1–15)
The vehicle interface module (VIM) provides relays, fuses, and connection points for interface with the output side
of the vehicle electrical system. VIMs are available for both 12V and 24V electrical systems. The VIM for 12V
systems uses all 12V relays. The VIM for 24V systems had four 24V relays and two 12V relays prior to Model Year
1995 and all 24V relays beginning with Model Year 1995. Refer to the Parts Catalog for the transmission assembly
number that you are servicing for detailed parts information. Refer to pages D–25 and D–26 for VIM wire number
and terminal information.
1–9.

TRANSID FEATURE

A. General Description
The TransID feature has been provided so that Allison Transmission can make component changes
which require calibration changes but still retain both the original transmission A/N and the
original calibrated ECU A/N. The purpose of TransID is to reduce the need for OEMs to use cross-
reference lists of transmission and calibrated ECU A/Ns when such changes to the transmission are
made. TransID allows OEMs to order specific transmission A/Ns and calibrated ECU A/Ns and
receive all changes made to the transmission and all of the corresponding calibrations. This will
reduce the number of A/N changeovers with which an OEM must contend.
The basis for the TransID system is the creation of a TransID wire in the WTEC II and III system to
provide a signal to the ECU of the TransID level of the transmission. This wire for WTEC II and III
will be connected directly to the Analog Ground (wire 135) to signal TransID level 1 (TID 1).
TransID levels 2 through 8 will only apply to WTEC III and are covered in TS2973EN, WTEC III
Troubleshooting. The connection point of the TransID wire will provide the signal to tell the ECU
which calibration is required by the transmission.
Whenever a TransID level change is to be made, the new TransID level calibrations will be placed
in the PROM Calibration Configurator System (PCCS) ninety days before the change(s) is(are)
made in production to the transmissions. All ECUs programmed and sold after that date will then
be loaded with the new TransID level calibration. These ECUs will contain calibrations for the new
level transmission and all previous TransID levels and will automatically load the correct
calibration for the transmission. This eliminates worry on the part of the OEM of coordinating the
implementation of the new ECU and the new transmission and allows their focus to be on using the
stock of the earlier level ECU.
1–10
GENERAL DESCRIPTION
Figure 1–15. Vehicle Interface Module (VIM)
Copyright © 1998 General Motors Corp.
V00631.02