Copyright © 1998 General Motors Corp. 7–3
INPUT AND OUTPUT FUNCTIONS
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
7–2. OUTPUT FUNCTIONS
Output functions are signals sent out by the ECU that activate or control devices or mechanisms. These control
devices or mechanisms are controlled by relays or direct connection signals from the ECU.
Many input and output functions are closely related. For instance, the PTO Enable option (input function) also
includes PTO Output wiring information. When searching for output function information, be sure to check any
related input function information references.
The wiring schematics in Appendix J illustrate installation requirements for output functions as well as input
functions and designate specific wire numbers in the transmission control system to be used for the activation of
these output functions. The wiring schematics in Appendix J should be used for reference only. Ask the vehicle
manufacturer which specific output functions are programmed and which wires are used. Output function polarity
is not significant when an Allison-supplied VIM is used. The Pro-Link
®
9000 can also be utilized to determine
which wire was programmed for a particular output function. For more detailed information on output functions,
refer to the Sales Tech Data Book “WT Controls and General Information.”
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