Navistar Electrical Systems CV
Integration Guide
Page 26 of 84
Revision Date: 9/12/2019
3.10.3. OSIM PTO - Mobile Operation:
Enable Conditions
OSIM Mobile Operation can be initiated as follows:
1. Engine must be running.
2. Cruise Control must be OFF.
3. Engine rpm must be less than 1500 rpm [Maximum PTO Engage Speed]
4. With the vehicle rolling slowly, shift the transmission to M1, M2 or M3.
5. The brake pedal must be tapped at least once and then remain released.
6. Press and release the PTO In-cab switch. The PTO telltale will blink
rapidly.
7. Within 10 seconds press and release the cruise control resume (+)
switch. The PTO indicator light will continue blinking rapidly until the load
becomes engaged and then come ON steady. The engine rpm will
advance to PTO Standby Speed if that is greater than the engagement
speed. If the engine speed is above 1500 rpm when engagement is
attempted the PTO load relay will not engage until the engine rpm moves
below 1500.
8. Once engaged the engine speed will hold steady at the PTO Standby
Speed setting. The desired engine speed can now be adjusted with the
cruise control buttons or the accelerator pedal. The cruise set (-) and
resume (+) buttons will operate similar to normal highway cruise operation
to either tap up and down or ramp up and down. The desired engine rpm
can also be captured with the cruse set switch and then fine-tuned by tap
up and tap down operations.
9. After initial engagement, if the service brake must be applied, the engine
rpms will drop and the PTO will not attempt to hold engine speed until it is
again initiated [latched up] with the cruise Resume (+) switch. Once the
resume (+) switch is pressed, the engine speed will slowly move to the
last 'captured' speed.
Notes:
1. In Mobile PTO mode the vehicle speed achieved is the result of the
current engine speed requested and the transmission gear range
selected. When vehicle is placed in M2 or M3, the vehicle will upshift
according to engine RPM set point, and vehicle speed will increase. To
prevent upshifts and maintain lower vehicle speeds, place vehicle in M1.
2. Mobile mode [engine speed capture] is disengaged similarly to cruise
control disengagement. See PTO System Disengage Conditions -
Mobile Mode for more details.
