Navistar Electrical Systems CV
Integration Guide
Page 12 of 84
Revision Date: 9/12/2019
N
D-BU/GY
6089
II
Power Take Off Remote Switch
Set Signal (1)
R
VT/WH
239
II
Run/Crank Ignition 1 Voltage
Power for Relay common contact
pin [30]
3.4.
Factory PTO Settings
The PTO system is programmed in the plant for a basic 3 speed idle up [Stationary
Preset] mode with the relay control circuit enabled and ready to close a control relay.
[The relay is not included and must be added by the Truck Equipment Manufacture
(TEM).] For most customers the only electrical connections that are required are a
control relay and an oil solenoid. The system is ready to go. [Older systems did not
have the relay driver turned on so they would not engage the PTO until
reprogrammed at a dealer. That has been corrected.]
The three factory speeds are:
1.
900 RPM
–
occurs with press and release of the PTO switch
2.
1200 RPM
–
occurs with press and release of the Cruise SET switch [if
PTO is ON]
3.
1900 RPM
–
occurs with press and release of the Cruise Resume Switch
[if PTO is ON]
See schematic below. The components in the grey shaded box are what must be
connected to X191 for basic in cab operation [Stationary Preset].
IMPORTANT: On a new unit before anything is connected, start the truck in park
with the park brake set and the Cruise Control Switch is OFF. Press and release
the PTO in-cab Switch. You should be able to achieve the 3-speed operation
described above. If not, have the dealer fix it before you proceed! When proper
idle up operation is confirmed THEN connect your components.
