Navistar Electrical Systems CV
Integration Guide
Page 6 of 84
Revision Date: 9/12/2019
information could be gauge information such as engine oil pressure, or switch
information that controls vehicle functions such as headlamps.
The electrical system relies on a collection of electronic circuit modules and software to
perform vehicle functions instead of implementing similar features using complex wire
harness designs with electromechanical relays and switches. These electronic module
components are connected together by data links. The data links can be thought of as
computer networks that allow the electronic components on the vehicle to communicate
with one another.
The concept of multiplexing is not new since data links for communicating between
engine controllers, the instrument cluster and the diagnostic connector have been used
for several years.
The goal of multiplexing is to reduce cab harness wiring and to simplify circuits. This is
accomplished by using a low current data link for communicating between cab switches,
the Body Controller and the Instrument Cluster. Other data links in the vehicle allow
other electrical controllers, the BC and the Instrument Cluster to communicate with each
other.
3.2.
Power Take Off (PTO) & Engine Speed Controls (Sales Feature Code 12WGG)
Feature Description:
Engine speed control for electronicly controlled Power Take Off
(PTO) device, includes On/Off switch mounted on Dash, with steering wheel mounted
engine speed control button.
3.3.
Power Take-Off (PTO) - Quick Start Reference
The PTO is an Truck Equipment Manufacture (TEM) integrated system that allows the
user to create an auxiliary power source for running add-on equipment, such as salt
spreaders, dump beds, lifts, winches, and lift buckets etc. The PTO system controls
engine speed to values higher than normal base idle, PTO load relay engagement, and
remote starting and shutdown of the engine.
PTO Components
The OEM PTO components consist of:
The transmission [internal] PTO gear
–
rotates with the torque converter
The in-cab PTO switch and cruise control SET and RES
s
witches
The PTO telltale indicator
The Driver Information Center (DIC)
The Radio and Navigation Screen (HMI)
The Power Take Off Module (PTOM)
The remote PTO Truck Equipment Manufacture (TEM) connector [X191]