Western Star Trucks Engine Interfacing Systems

Routed In Chassis All Models
In chass Back of Cab Prewired Switches (All Models)
These switch options provide additional switches in the dash with battery power in and blunt cut wires routed in the chassis Harness under the cab from front wall to the Back of Cab with approximately 6 feet of coiled wire.

In chass End of Frame Prewired Switches (All Models)
These switch options provide additional switches in the dash with battery power and blunt cut wires routed in the chassis harness to the end of frame typically with 6 feet of coiled wire.

Prewired in Floor Track 4700 Models Only
Prewired switches to inside BOC 4700
The floor track switch options are designed to provide prewired dash switches pre routed to the inside back wall of the cab. The 4700’s body up-fit friendly floor track system creates a safe and easily accessible routing path to which has capacity for up to six - ½ ” harness bundles. these bundles are protected by an easy access cover and eliminate the work of adding additional switches. see sections 1A and 1B for more information on switch types, switch covers and harness schematic information.

RPM Control
Module 148, RPM Control, has sales codes used by customers to define the RPM control functionality. Engine RPM control supports vocational applications typically using PTOs. RPM control can be implemented exclusively in engine programming, with standard engine controls (e.g. Cruise Control switches), or through a remote interface.

Driver Fuel Economy Incentive (SC 79C)
The 79C, Driver Fuel Economy Incentive, option is used by customers to select the programming of fuel economy incentive parameters that may be available on electronically-controlled EPA 2010 engines introduced after 1 January 2010. The system measures the engine's actual fuel economy and adjusts the vehicle speed governor based on the vehicle driver's attainment of fuel economy greater than a customer-defined minimum.2010. The system measures the engine's actual fuel economy and adjusts the vehicle speed governor based on the vehicle driver's attainment of fuel economy greater than a customer-defined minimum.

Low Range Torque Protect (SC 79E)
Module 79E, Low Range Torque Protect, contains Option codes that automates selection of the low range torque protection process for combinations that usually require this feature. Low range: also known as low gear refers to the lowest gears in a transmission. For purposes of this reference, low gears are those gears capable of producing a multiplied torque output that exceeds the torque rating of the driveline or rear axle components (or, in some cases, auxiliary transmissions or transfer cases). Torque protect is designed as a derating scheme where the engine's torque output is reduced, usually to allow components with lower torque ratings to be used in the driveline and/or rear axle without failing.

Idle Shut Down (SC 79G)
Module 79G, Idle Shut Down, controls the configuration of the engine's idle shutdown configuration, including the number of minutes before shutdown and whether or not the driver is allowed to override the shutdown using the clutch or service brake pedals. For some engines, the driver override feature specified for the idle shutdown must also be applied to the PTO shutdown feature, if that feature is specified. This requirement creates a linkage between modules 79G and 79J that will be enforced through compatibility rules.

Definitions
The idle shutdown feature is affected by the engine's PTO governor. In most vehicles, the PTO governor is enabled by default, to allow a driver to change engine speed using the Cruise Control switches. When checking the operation of the idle shutdown, ensure that the cruise control on/off switch has been turned off.