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Instruments NOTICE A sudden increase in transmission fluid temperature that is not caused by a load increase may indicate mechanical failure. Bring the vehicle to a safe stop and investigate the cause to prevent further damage. Do not operate the vehicle until the cause has been determined and corrected. Under heavy loads, such as when climbing steep grades, temperatures that exceed the normal oil temperature range for a short period are not unusual. If the temperature returns to normal when the load decreases, there is no problem. Driver Message Center ICU3/ICU4 The driver message center is controlled using the mode/reset switch, located on the right side of the ICU, and the + and – buttons mounted in the righthand pod of the steering wheel (Fig. 4.9). See Fig. 4.1 and Fig. 4.9. Tap the mode/reset switch or the + switch to advance one screen; press and hold either switch to select a menu choice or reset the display. When the display resets, an audible chirp sounds. + Turbocharger Boost Pressure Gauge A turbocharger boost pressure gauge indicates the pressure in the intake manifold, in excess of atmospheric pressure, being created by the turbocharger. MRKR INT − ENG BRK Voltmeter The voltmeter indicates the vehicle charging system voltage when the engine is running and the battery voltage when the engine is off. By monitoring the voltmeter, the driver can stay aware of potential battery charging problems and have them fixed before the batteries discharge enough to create starting difficulties. Cascadia vehicles are equipped with either a voltmeter gauge, or a digital voltmeter readout located on the bottom line of the dash message center. The voltmeter will normally show approximately 13.7 to 14.1 volts when the engine is running. The voltage of a fully charged battery is 12.7 to 12.8 volts when the engine is off. Battery voltage under 12.0 volts is considered a low battery, and a completely discharged battery will produce only about 11.0 volts. If the voltmeter shows an undercharged or overcharged condition for an extended period, have the charging system and batteries checked at an authorized Freightliner service facility. On a vehicle equipped with a battery isolator system, the voltmeter measures the average voltage of all the batteries when the engine is running. When the engine is off, the voltmeter shows only the isolated battery voltage and does not indicate the voltage of the engine-starting batteries. 4.11 02/06/2007 f462061 NOTE: To reset values in the ICU4M and ICU4Me driver message centers, press and hold the + switch. Fig. 4.9, Steering Wheel-Mounted Switches Four driving screens are accessible when the parking brake is off. All screens and menus are accessible when the parking brake is on (parked screens). Driving Screens 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 + and – switches on the steering wheel, or the mode/reset switch, to scroll through the screens. To reset any values, press and hold the + switch or the mode/reset switch. The driving screens appear in the following order: i. Odometer ii. Trip distance