Description and Operation of PTO Dosing
PTO Dosing is a feature that enables Active Regeneration of the DPFs while in PTO mode. This can reduce the
chance of hydrocarbon buildup and DPF zone faults in vehicles that spend a large amount of time in PTO mode.
Fast idle operation of the engine to provide heat or cooling of the chassis typically does not generate sufficient
load to support PTO dosing.
Requirements for PTO Dosing
Active Regeneration in PTO mode can initiate if the following conditions are met:
• PTO Dosing is enabled in the ACM.
• Minimum PTO engine speed of 1000 rpm using either the Cruise Control switches or a dedicated PTO
switch.
• Minimum engine load of approximately 20 to 25%.
• Minimum sustained DOC Inlet Temperature of 280C (536F).
• Ambient conditions such as extreme heat or cold will have an effect on exhaust temperatures and can
affect regeneration capabilities in this mode.
Enabling the PTO Dosing Feature
The application code is programmed at the time of new vehicle order. Vehicles already delivered may have the
PTO Dosing feature enabled using DiagnosticLink Professional 8.09 or higher.
The enabling parameter in the ACM is:
PGR005_DPF -> PTO DPF Dosing Enable; 1= Enabled or 0= Disabled
For new GHG17 vehicle orders, the dealer should order data book code 79V-001 to enable PTO Dosing as a
factory installed option.
Before making the parameter change, it is recommended that the repair shop review a log file and DDEC Reports
of a normal customer duty cycle to ensure PTO Dosing will fulfill the customer’s needs. For more information Refer
to section “Throttle Control/Governors” , scroll down to the PTO Dosing Feature section.
Note : Successful Active Regeneration while PTO Dosing is enabled will result in higher exhaust temperatures.
Make certain the exhaust outlets are directed away from structures, trees, vegetation, flammable materials, and
anything else that may be damaged or injured by prolonged exposure to high heat. This could be during any PTO
event, including driving PTO applications, as PTO Dosing runs off triggers and has no input from the driver under
normal operating conditions.