The power take-off (PTO) is an upfitted integrated system that allows the user to create an auxiliary power source for running add-on equipment, such as salt spreaders, snow plows, winches and lift buckets. 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.

Primary PTO Operating Modes

PTO modes of operation include the following:

The PTO stationary mode provides both in-cab and remote controls. The in-cab controls are enabled as the factory preset. The remote controls are disabled. This factory preset configuration can be programmed to enable the remote controls, and/or disable the in-cab PTO controls. See your dealer for more information.

PTO Sub - Modes

The primary PTO modes have the following sub-modes:

PTO Enabling/Disabling Conditions

Enabling Conditions - Stationary PTO

To engage stationary PTO operation, the following conditions must be met:

For in-cab PTO operation:

Press and release the 1 position on the PTO switch. The PTO LED light will blink fast until the PTO load becomes engaged. The LED light will then be on steady. The -/SET and +/RES switch positions can then be used to establish the desired PTO operating speed.

For remote PTO operation:

Press and release the remote PTO arming switch, then within five seconds, move the PTO enable switch from OFF to ON (open to closed). The remote LED light will come on when the PTO Load is engaged. The PTO remote SET switch can then be used to establish the desired PTO operating speed. Additional information is available in the service manual for the correct wiring configuration and programming of the remote PTO enable and set switches. These switches are accessed through the PTO upfitter connector, located under the passenger side door.

Enabling Conditions - Mobile PTO

To engage mobile PTO operation, the following conditions must be met prior to turning on PTO:

DIC WARNING MESSAGES

One or more of the following Driver Information Center (DIC) messages may appear on the instrument panel cluster if the PTO will not engage. The operator must take the action indicated, then again press and release the 1 position of the PTO switch.

In addition to these messages, the PTO switch LED will indicate when all conditions required to engage PTO have not been met. When enabling PTO, the LED will turn on, then off after one second. Under normal operating conditions, the PTO LED will remain on throughout the PTO operating cycle.

PTO Disengage Conditions

To disengage the stationary or mobile PTO operation, do one of the following:

The mobile PTO mode will also disengage if the following conditions are detected by the vehicle electronics:

The stationary PTO mode will also disengage if any of the following conditions are detected by the vehicle electronics:

Preset PTO Mode

Preset PTO can only be used when the vehicle is not moving. The engine speed is initially set to a stand-by engine speed (850 rpm) when the PTO in-cab 1 switch position is pressed or, by pressing and releasing the remote arming switch. Then within five seconds, assert the remote PTO enable switch to on. This provides an initial start-up engine speed to match the engagement of the PTO load. The PTO standby engine speed can be reprogrammed to a higher speed by your dealer.

Choose one of two factory presets by pressing the PTO In-cab -/SET or +/RES switch positions or the remote PTO SET switch. Speed 1 and Speed 2 are programmable by a service technician from base engine idle rpm to max PTO operation speed (3100 rpm).

Pressing the 0 switch position on the PTO in-cab switch or moving the remote PTO enable switch to OFF results in the return of the engine speed back to normal idle. The PTO load relay is also disengaged.

Maximum PTO Operating Speed: During PTO operation, the accelerator pedal can be pressed to adjust the engine speed. To protect the PTO from over-speed, the PTO system will disengage when the engine speed exceeds 2100 rpm.

The Stationary PTO Mode provides both in-cab and remote controls. The in-cab controls are enabled as the factory preset. The remote controls are disabled. This factory preset configuration can also be reprogrammed to enable the remote controls, and disable the in-cab PTO controls (i.e., PTO switch, accelerator pedal). See your dealer for more information.

Variable PTO Mode

In this mode, the vehicle can be programmed for stationary or mobile operation.

The variable PTO mode controls engine speed and PTO load engagement is selected by either the PTO in-cab or remote switches. Engine speed selection is variable between base engine idle speed and a maximum of 3100 rpm (factory setting 2100 rpm).

In the mobile PTO mode, the vehicle will operate at a vehicle speed resulting from the current PTO engine speed request and current transmission gear range selected.

Vehicle speed stability is greatly improved by shifting into the transmission manual mode because upshifts are limited. This reduces the maximum vehicle speed while allowing high engine speed operation. Therefore, low vehicle speed operation (10-25 mph) (16-40 km/h) and high PTO engine speed (1,500 -2,000 rpm) can be achieved in the manual mode 1 and 2 transmission ranges.

PTO Switch Operation

In-cab PTO Switch Operation:

(On): This is the PTO switch On position.

To engage PTO, press and release the in-cab 1 switch position or, press and release the remote PTO arming switch, then within five seconds, assert the remote enable switch to on. The vehicle will increase engine speed to a factory preset engine speed (800 rpm). This PTO stand-by speed is not intended to be an operational PTO speed, but allows the engagement of the PTO at lower initial start-up rpm to match with the engagement of the PTO load relay.

The initial stand-by speed can be adjusted by holding the accelerator to the desired engine speed, then pressing and releasing the 1 in-cab PTO switch position. The current engine speed will become the new stand-by speed. This adjustment can only be done once at the initial engagement of PTO. The initial stand-by speed adjustment must be between engine base idle speed and 1800 rpm (maximum PTO engage speed).

(Off): This is the PTO switch Off position. Press and release the in-cab 0 switch position or assert the remote enable switch to off to disengage PTO. The engine speed will be reduced to the base idle speed and the PTO load relay will be disengaged.

-/SET (SET/TAP-DOWN/COAST)

SET:  Press and hold the accelerator to obtain the desired engine speed, then press and release the -/SET position of the PTO switch. The current engine speed will be maintained. This action can be repeated as desired to a higher rpm value. The PTO set speed cannot exceed 2100 rpm.

TAP-DOWN: Press and release the -/SET switch position on the PTO switch to reduce the engine speed by increments of 100 rpm.

COAST: Press and hold the -/SET switch position on the PTO switch to reduce the rpm by 200 rpm per second until the desired engine speed is reached or until the initial PTO standby speed is reached.

+/RES (RESUME/TAP-UP/ACCEL)

RESUME: When a PTO set speed has been achieved, press and release the brake pedal. Engine speed will reduce to basic idle speed. The PTO LED will blink slowly indicating the previous PTO set speed has been retained in memory. Press and release the +/RES switch position to resume the previous PTO set speed. The PTO set speed cannot exceed 2100 rpm.

TAP-UP: Press and release the +/RES position to increase the engine speed by increments of 100 rpm.

ACCEL: Press and hold the +/RES position to increase the rpm by 200 rpm per second until the desired engine speed is reached or until the maximum allowable PTO set speed is reached.

Engine Shutdown Control

The vehicle’s PTO system allows for remote engine shutdown while operating in the stationary PTO mode. This feature has the following functions:

Remote Engine Starting

The vehicle’s PTO system allows the engine to be remotely started while operating in the stationary PTO mode. The vehicle wiring system provides for connections to a remote engine start arming switch and remote starting switch. These connections are accessed through the upfitter connector.

The remote start function is initiated by a sequence of switch actions, in addition to several vehicle conditions.

The following conditions must be met before attempting to remote start the engine. The vehicle ignition key can be in any position or removed from the ignition.

Once the above conditions are met, to continue the with the remote start, do the following using the remote PTO controls:

1. Press and release the remote start arming switch.
2. Within five seconds of releasing the remote start arming switch, press and hold the remote engine start switch for about two seconds until the engine starts. Release the remote engine start switch.

To enable normal PTO operation following a remote start event, press and release the arming switch. Then within five seconds, the PTO remote enable switch must be toggled to off, then back to on. The PTO system will then elevate engine rpm to standby speed and engage the PTO load. Press the remote PTO -/SET or +/RES switch to elevate PTO to the desired engine operating speed.

See your dealer for additional information on the PTO system and settings.

Prolonged or Extended PTO Operation

While operating your vehicle in stationary PTO mode, the Diesel Particulate Filter (DPF) will continue to filter the exhaust and accumulate soot. The engine control system, depending on the speed and load being applied by the PTO, may not be able to generate enough energy or adequate heat needed to clean or regenerate the DPF. Continued operation under conditions that do not allow effective regeneration or cleaning will eventually plug the DPF and result in reduced power. The ENGINE POWER IS REDUCED Driver Information Center (DIC) message and Malfunction Indicator Lamp will be displayed, and dealer/retailer service will be required to return your vehicle to normal, full power operation. To prevent this from occurring, frequently monitor your vehicle during PTO operation, paying particular attention to the CLEAN EXHAUST FILTER SEE OWNER MANUAL NOW DIC warning message. If the DIC message is displayed during PTO operation, see Diesel Particulate Filter for information on how to clean or regenerate the DPF. Also see "Engine Shutdown Control" earlier in this section.

Factory Preset Parameters

If the PTO factory preset parameters do not match the settings described above, then they may have already been altered in order to satisfy the requirements of the installed PTO system and body equipment.