This manual provides information needed to operate and understand the vehicle and its components. More detailed information is contained in the Owner’s Warranty Information for North America booklet, and in the vehicle’s Freightliner workshop and maintenance manuals.
This vehicle must be regularly inspected and maintained as indicated in the Business Class M2 Maintenance Manual, and in the Pretrip and Post-Trip Inspections and Maintenance chapter in this manual, in order to continue satisfactory performance and ensure coverage of the vehicle under the manufacturer’s warranty. Many maintenance procedures ensure that the vehicle and engine continue to comply with applicable emissions standards. Maintenance procedures, using components engineered to comply with greenhouse gas emissions and fuel efficiency regulations, may be performed by an authorized Daimler Trucks North America dealer, an independent outlet, or the vehicle owner or operator.
The vehicle owner is responsible for determining the suitability of replacement components to maintain compliance with federal and local jurisdictional regulations. Components including, but not limited to, tires, cab/sleeper side extenders, chassis fairings, bumper, hood, vehicle speed limiters, and idle reduction timers are specifically designed and manufactured to exacting standards for regulatory fuel efficiency and greenhouse gas emissions compliance. It is important that these components are always replaced with components that meet or exceed the performance of the originally installed components.
Freightliner Main Fuse Box/PDM
The main fuse box, also known as the power distribution module, or PDM, is located under the hood on the left front fender just forward of the bulkhead module. See Fig. 2.11. To open the fuse box, pull down on the wire clips holding the lid on the fuse box.
A sticker inside the lid of the fuse box shows the locations of the fuses and describes the circuit(s) that each fuse protects (see Fig. 2.12). See Table 2.1 for descriptions of a typical set of fuses. The fuses in the main fuse box are mini blade-type fuses. Battery power fuses, located near the batteries, are bolt-in megafuses. Because the electrical system is multiplexed, no relays are needed. The multiplexing module performs the functions normally provided by relays.
Trailer and Taillight Fuse Boxes
The trailer fuse box and the taillight fuse box, on vehicles so equipped, are mounted on a bracket with the chassis module on the left-hand frame rail aft of the cab, or on a crossmember at the end of the frame rail. These may be referred to as the chassis fuse box or chassis PDM. See Fig. 2.13 for trailer fuse and relay information, and Fig. 2.14 for taillight fuse and relay information.
The instrumentation control unit (ICU) provides the driver with engine and vehicle information. It is comprised of standard and optional gauges, an audible warning, a driver message center, and a lightbar containing warning and indicator lamps (also known as telltales). Warning and indicator lamps illuminate in red (danger), amber (caution), green (status advisory), or blue (high-beam headlights active).
If the ICU receives active fault codes, it displays them one after the other until the parking brake is released or the ignition is turned off. Once the parking brake is completely released, the ICU displays the odometer. If there are no active faults, the ICU displays the odometer after the self-check completes.
The STOP engine lamp illuminates when the engine protection system is activated in one of two ways. On some engines, the engine protection system will derate the engine, allowing it to run at lower rpm and slower vehicle speed. Drive the vehicle to a safe location or to a service facility.
On other engines, the engine protection system will shut down the engine. It will first derate the engine, then shut it down completely 30 to 60 seconds after the indicator illuminates (depending on the critical fault type) if the condition does not improve. Bring the vehicle to a stop on the side of the road before the engine shuts down.
Some vehicles may have a shutdown-override switch, which may be used to momentarily override the shutdown sequence. See Chapter 7 for detailed information regarding the shutdown process.
To restart the engine, turn the ignition to OFF, leave it there a few seconds, then turn the ignition to START. The engine will run for a short period and shut down again if the condition does not improve.
Driver Message Center
The following screens are available when the parking brake is off (when the vehicle is mobile) and no active fault codes are found. Use the mode/reset switch to scroll through the screens. To reset any values, press and hold the mode/reset switch. The driving screens appear in the following order:
- Trip distance
- Trip hours
- Outside temperature
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When the outside temperature drops to 34°F (1.7°C) or less, the ICU displays a caution text at onesecond intervals for five seconds, and an audible alert sounds. Tap the mode/reset switch to acknowledge the message. The audible alert will not sound again unless the temperature cycles above 37°F (4°C) and back to 34°F (1.7°C) or less. This warning only occurs while the ignition is on and the parking brake is released.
The temperature alert message allows the driver to enable or disable the ambient temperature warning. Press and hold the mode/reset switch to toggle between on and off. Release the mode/reset switch, then tap it to select the displayed choice.
Freightliner Diagnostics Manual
When the DIAG screen is displayed, press and hold the mode/reset switch to access the various diagnostic screens. The diagnostic screens are used by trained technicians to retrieve fault codes and other diagnostic information pertaining to the vehicle. If active fault codes display during start-up or at any other time, make a note of the fault code and take the vehicle to an authorized Freightliner service facility. If fault codes are displayed, press and hold the mode/reset switch to view the next fault code until reaching the DIAG screen.
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