Instruments

Instrumentation Control Units

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).

Cascadia vehicles are equipped with an ICU3, ICU3S, ICU4, ICU4M, or ICU4Me. See Fig. 4.1 , Fig. 4.2 , Fig. 4.3 , and Fig. 4.4 for typical ICU layouts.

The following headings in this chapter provide additional information and operating instructions for ICU components:

"Warning and Indicator Lights"

"Instruments"

1. Transmission Temperature Gauge
2. Coolant Temperature Gauge
3. Engine Oil Pressure Gauge
4. Driver Message Center
5. Fuel/DEF Level Gauge
6. Primary Air Pressure Gauge
7. Secondary Air Pressure Gauge
8. Speedometer
9. Tachometer
10. High Beam Indicator
11. Driver Display Screen
12. Mode/Reset Switch
13. Satellite Gauges

Fig. 4.1, ICU3 Instrument Cluster (EPA10 shown)

NOTE: This instrument cluster has 8 optional telltales. The gear, engine brake, and cruise control are indicated in the driver display, rather than with telltales.

1. Engine Oil Pressure Gauge
2. Optional Telltales
3. Driver Message Center
4. Fuel/DEF Level Gauge
5. Primary Air Pressure Gauge
6. Secondary Air Pressure Gauge
7. Speedometer (U.S. version)
8. Tachometer
9. Transmission Temperature Gauge
10. Coolant Temperature Gauge

Fig. 4.2, ICU3S (GHG14 and newer shown)

NOTE: The ICU4 and ICU4M are nearly identical, with the exception of the driver message center (Item 7).

1. Battery Voltage Gauge
2. Lightbar
3. Engine Oil Pressure Gauge
4. Coolant Temperature Gauge
5. Engine Oil Temperature Gauge
6. Turbo Boost Air Pressure Gauge
7. Driver Message Center
8. Tachometer
9. Speedometer
10. Primary Air Pressure Gauge
11. Fuel/DEF Level Gauge
12. Secondary Air Pressure Gauge
13. Pyrometer
14. Rear Axle Temperature Gauge

Fig. 4.3, ICU4M Instrument Cluster (EPA10 shown)

1. Engine Oil Temperature Gauge
2. Front Axle Temperature Gauge
3. Rear Axle Temperature Gauge
4. Speedometer and Coolant Temperature Gauge
5. Fuel/DEF Level Gauge
6. Tachometer and Engine Oil Pressure Gauge
7. Primary Air Pressure Gauge
8. Secondary Air Pressure Gauge
9. Transmission Oil Temperature Gauge
10. Driver Message Center

Fig. 4.4, ICU4Me Instrument Cluster

"Driver Message Center"

Ignition Sequence

When the ignition is turned on, the ICU runs a self-check. See Fig. 4.5 . Observing the ignition sequence is a good way to ensure the ICU is functioning properly.

IMPORTANT: Do not crank the engine until the ICU self-check is complete.

NOTE: Air gauges do not complete a sweep of their dials during the ignition sequence.

When the ignition is turned on, the following actions should occur:

electronic gauges complete a full sweep of their dials

warning and indicator lamps illuminate, then are extinguished

audible alert sounds for approximately four seconds or until sufficient air pressure builds up in the primary and secondary air systems

DEF level indicator illuminates all segments green, then turns them off one at a time before turning the leftmost segment amber and then red

Freightliner logo displays on the ICU4Me driver message center for two seconds.

software revision level of the ICU is displayed on the driver message center, followed by any active faults

IMPORTANT: If any red or amber warning and indicator lamps do not illuminate during the ICU self-check or do not go out after the self-check completes, take the action outlined in "Warning and Indicator Lights", or take the vehicle to an authorized Freightliner service facility as soon as possible.

NOTE: If active faults are present, take the vehicle to an authorized Freightliner service facility as soon as possible.

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.

When the self-check is complete on an ICU4M, the fasten seat belt screen displays if the engine is off. If the engine is running, the idle hours screen displays.

Fig. 4.5, ICU Ignition Sequence

Audible Alerts

An audible alert sounds during the ignition sequence and whenever one of the following conditions exists:

Engine oil pressure falls below the minimum preset value.

Coolant temperature rises above the maximum preset value.

Air pressure falls below approximately 70 psi (483 kPa).

Parking brake is set with the vehicle moving faster than two miles per hour.

System voltage falls below 11.9 volts.

Door is open or the headlights are on, with the parking brake off.

Driver seat belt is not fastened with the parking brake off (optional).

Outside temperature falls below 35°F (1.7°C) (optional).

Warning and Indicator Lights

The ICU lightbar has three or four rows of warning and indicator lights with icon symbols, depending on the ICU. The positions of the lights may vary for the different ICU's, but the telltales are standard for all applications. See Tablet1-ch04020dm for a listing of standard and commonly used warning and indicator lamps.

Warning and indicator lamps illuminate in red (danger), amber (caution), green (status advisory), or blue (high-beam headlights active).

IMPORTANT: Depending upon local jurisdictional emissions guidelines, vehicles and/or engines that are domiciled outside of the U.S. and Canada may not be compliant with EPA07, EPA10, GHG14, or GHG17 regulations. Noncompliant vehicles may not be equipped with all of the lamps shown in Tablet1-ch04020dm.

Common Warning and Indicator Lamps and ICU Messages
Lamp Description			Color
	STOP Engine^*	Indicates a serious fault that requires engine shutdown immediately. The engine protection system will reduce the maximum engine torque and speed, and, if the condition does not improve, will shut down the engine within 30 to 60 seconds. Safely bring the vehicle to a stop on the side of the road and shut down the engine as soon as the red light is seen. If the engine shuts down while the vehicle is in a hazardous location, turn the key to the OFF position for a few seconds, then restart the engine and move the vehicle to a safer location.	Red
	High Coolant Temperature	Indicates the coolant temperature is above the maximum allowable temperature.	Red
	Low Air Pressure (EPA07)	Indicates air pressure in the primary or secondary reservoir has dropped below approximately 70 psi (483 kPa).	Red
	Low Air Pressure (EPA10 and Newer)	Indicates air pressure in the primary or secondary reservoir has dropped below approximately 70 psi (483 kPa).	Red
	Low Air Pressure (ICU4Me only, mid-GHG14)	Indicates air pressure in the primary or secondary reservoir has dropped below approximately 70 psi (483 kPa).	—
	Low Engine Oil Pressure	Indicates the engine oil pressure is below the minimum allowable pressure.	Red
	Transmission Overheat	Indicates high transmission temperature.	Red
	Transmission Fluid Level	Indicates low transmission fluid level. Safely bring the vehicle to a stop as soon as possible.	Red
	Parking Brake (EPA07)	Indicates the parking brake is engaged, or hydraulic brake fluid pressure is low. An audible alert activates when the vehicle is moving over 2 mph (3 km/h) with the parking brake set.	Red
	Parking Brake (EPA10 and Newer)	Indicates the parking brake is engaged.	Red
	Low Battery Voltage	Indicates that battery voltage is 11.9 volts or less.	Red
	Unfastened Seat Belt	Activates with an audible alert when the system detects that the parking brake is off and the driver seat belt is not fastened on some vehicles. On other vehicles, this lamp illuminates for 15 seconds when the ignition is first turned on.	Red
	Check ECAS	Indicates Electronically Controlled Air Suspension (ECAS) active fault.	Red
	CHECK Engine^{^*}	Indicates an engine condition (low oil pressure, low coolant level, high coolant temperature, high DPF soot level, or uncontrolled DPF regeneration) that requires correction. Correct the condition as soon as possible. If the condition worsens, the STOP engine lamp will illuminate.	Amber
	High Exhaust System Temperature (HEST)^{^*}	Slow (10-second) flashing indicates a regeneration (regen) is in progress. IMPORTANT: When the HEST lamp is illuminated, do not park the vehicle near flammable material. Solid illumination indicates high exhaust temperatures at the outlet of the tail pipe when speed is below 5 mph (8 km/h).	Amber
	Diesel Particulate Filter (DPF) Status	Solid illumination indicates a regen is required. Change to a more challenging duty cycle (such as highway driving ) to raise exhaust temperatures for at least twenty minutes, or perform a parked regen. Blinking indicates that a parked regen is required immediately. An engine derate and shutdown will occur.	Amber
	Malfunction Indicator Lamp (MIL)	Indicates an emissions-related fault. See the engine operation manual for details.	Amber
	Vehicle ABS	Momentary illumination indicates the vehicle ABS is engaged. Solid illumination indicates a problem with the vehicle ABS. Repair the ABS immediately to ensure full braking capability.	Amber
	Trailer ABS	Momentary illumination indicates the trailer ABS is engaged. Solid illumination indicates a problem with the trailer ABS. Repair the ABS immediately to ensure full braking capability.	Amber
	No Charge	Indicates the alternator is not properly powering the electrical system.	Amber
	Water in Fuel	Indicates the fuel may contain water. Drain any water collected in the fuel/water separators.	Amber
	Fuel Filter Restriction	Indicates the fuel filter is clogged and requires service.	Amber
	Optimized Idle	Indicates optimized idle is enabled.	Amber
	Check Transmission	Indicates an undesirable transmission condition.	Amber
	Wait To Start (EPA07/EPA10)	Indicates that the system is preventing the starter from cranking. This can occur when the ignition switch is turned to START before the gauge sweep has completed, or if the starter has overheated. Turn the ignition switch back to ON, wait for the lamp to go out, then turn the ignition switch to START again.	Amber
	Start Blocked (GHG14 only)	Indicates that the system is preventing the starter from cranking. This can occur when the ignition switch is turned to START before the gauge sweep has completed, or if the starter has overheated. NOTE: Illumination of the Start Blocked lamp does not indicate a problem with the starter. Turn the ignition switch back to ON, wait for the lamp to go out, then turn the ignition switch to START again.	Amber
	Wheel Spin (pre-EPA16)	Flashing indicates the ATC system is active, or the ATC button has been pressed to allow wheel slip. Solid illumination indicates ATC is shut off or unavailable due to a system fault. In the event of a system fault, repair the ATC system immediately to ensure full braking capability.	Amber
	Stability Event (EPA16 and newer)	Flashing indicates a stability event has been detected, and the ESC system is active. Solid illumination indicates a problem with the stability system. Repair the ESC system immediately to ensure full stability capability.	Amber
	ATC Deactivated (EPA16 and newer)	Flashing indicates the ATC SPIN button has been pressed to allow wheel slip. Solid illumination indicates ATC is shut off or unavailable due to a system fault. In the event of a system fault, repair the ATC system immediately to ensure full braking capability.	Amber
	Roll Stability (pre-EPA16)	Momentary illumination indicates that a stability event has occurred. On vehicles that are also equipped with ATC, flashing indicates the ATC button has been pressed to allow wheel slip. Solid illumination indicates ATC is shut off or unavailable due to a system fault. In the event of a system fault, repair the ATC system immediately to ensure full braking capability.	Amber
	Hill Start Aid (HSA) Override	Indicates the HSA switch has been pressed to override the hill start assist feature.	Amber
	Outside Normal Ride Height	Indicates the current rear suspension height is not at the normal ride height. This light will turn off once the vehicle returns to normal ride height.	Amber
	Bulb Out (optional)	Indicates that a bulb is not functioning in the headlights, tail lights, parking lights, or marker lights.	Amber
	Engine Brake	Indicates the engine brake is enabled.	Green
	Left-Turn Signal	Flashing indicates the outside left-turn signal lights are activated.	Green
	Right-Turn Signal	Flashing indicates the outside right-turn signal lights are activated.	Green
	Cruise Control	Indicates the cruise control is enabled. NOTE: The ICU4Me does not have a green cruise control telltale.	Green
	Active Brake Assist (GHG14 and newer)	Indicates the Active Brake Assist system is not available.	Amber
	Lane Departure Warning	Indicates that lane departure warning is disabled due to minimum speed, no lane markings, or system not available. NOTE: Only on vehicles equipped with Detroit Assurance radar.	Amber
	High-Beam Headlights	Indicates the high-beam headlights are on.	Blue

^* See Fig. 4.6 for an explanation of the aftertreatment system (ATS) warning indicators, and actions required to avoid further engine protection steps.

Table 4.1, Common Warning and Indicator Lamps and ICU Messages

Engine Protection System

When the red STOP engine lamp illuminates, most engines are programmed to shut down automatically within 30 seconds. The driver must immediately move the vehicle to a safe location at the side of the road to prevent causing a hazardous situation that could cause bodily injury, property damage, or severe damage to the engine.

See Fig. 4.6 for an explanation of the aftertreatment system (ATS) warning indicators, and actions required to avoid further engine protection steps.

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.

Fig. 4.6, ATS Warning Lamps

IMPORTANT: Safely bring the vehicle to a stop on the side of the road and shut down the engine as soon as the red light is seen. If the engine shuts down while the vehicle is in a hazardous location, turn the key to the OFF position for a few seconds, then restart the engine and move the vehicle to a safer location.

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 11 for detailed information regarding the shutdown process.

IMPORTANT: Do not attempt to restart the engine while the vehicle is moving. Bring the vehicle to a safe stop, then restart the engine.

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.

Instruments

Standard instruments are present on every vehicle. They are listed here in alphabetical order to make the information easier to find.

Optional instruments, typically located on the auxiliary dash panel or right-hand control panel, are not found on every vehicle. They are listed here in alphabetical order, to make the information easier to find.

Air Intake Restriction Gauge

The air intake restriction gauge indicates the vacuum on the engine side of the air cleaner. On standard installations, it is mounted on the air intake duct in the engine compartment. As an option for easier viewing, the air intake restriction indicator (see Fig. 4.7 ) can be mounted on the dash, usually on the right-hand control panel.

Fig. 4.7, Air Intake Restriction Indicator

NOTE: Rain or snow can wet the filter and cause a temporary high reading.

Air intake restriction vacuum is measured in inches of water (inH₂O). For vehicles equipped with a graduated indicator or a restriction gauge on the dash, check the gauge with the engine off. If the yellow signal stays locked in the red zone once the engine is shut down, or is at or above the values shown in Table 4.2 , the air cleaner element needs to be replaced.

Vehicles may be equipped with a go/no-go restriction indicator without graduations (see Fig. 4.8 ) instead of a graduated indicator.

Air Intake Maximum Restriction Values (inH₂O)
Engine Make	Pre-EPA07 Engines	EPA07 and EPA10 Engines	GHG14 and GHG17 Engines
Cummins	25	25	25
Detroit	20	22	18
Mercedes-Benz	22	22	–

Table 4.2, Air Intake Maximum Restriction Values

Fig. 4.8, Manual-Reset Air Restriction Indicator, Go/No-Go

Application Air Pressure Gauge

An application air pressure gauge registers the air pressure being used to apply the brakes, and should be used for reference only. The gauge will not register air pressure until the foot brake pedal is depressed or the trailer hand brake is applied.

Coolant Temperature Gauge

NOTICE

A sudden increase in coolant temperature may indicate engine or cooling system failure. Bring the vehicle to a safe stop and investigate the cause to prevent further damage. Do not operate the engine until the cause has been determined and corrected.

During normal engine operation, the coolant temperature gauge should read 175 to 195°F (79 to 91°C). If the temperature remains below 160°F (71°C), inspect the cooling system to determine the cause.

If coolant temperature rises above the maximum temperature listed in Table 4.3 , the CHECK engine lamp will illuminate. If the condition does not improve, the STOP engine lamp will also illuminate and an audible warning will sound. The engine will then derate or shut down, depending on the type of engine protection system installed.

Maximum Coolant Temperature
Engine Make	Temperature: °F (°C)
Cummins	225 (107)
Detroit	215 (101)
Mercedes-Benz	221 (105)

Table 4.3, Maximum Coolant Temperature

Drive Axle Oil Temperature Gauges

NOTICE

A sudden increase in oil 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.

During normal operation, drive axle oil temperature gauges should read as follows:

160 to 220°F (71 to 104°C) for Detroit™ and Meritor™ drive axles

180 to 200°F (82 to 93°C) for Dana Spicer® drive axles

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.

Engine Oil Pressure Gauge

NOTICE

A sudden decrease or absence of oil pressure may indicate mechanical failure. Bring the vehicle to a safe stop and investigate the cause to prevent further damage. Do not operate the engine until the cause has been determined and corrected.

The engine oil pressure gauge displays the current engine oil pressure. If engine oil pressure falls below the minimum levels shown in Table 4.4 , the CHECK engine lamp will illuminate. If the condition does not improve, the STOP engine lamp will also illuminate and an audible warning will sound. The engine will then derate or shut down, depending on the type of engine protection system installed.

Minimum Oil Pressure^*
Engine Model	At Idle Speed: psi (kPa)	At Rated RPM: psi (kPa)
Cummins	15 (103)	35 (241)
Detroit	14 (97)	55 (350)
Mercedes-Benz	7 (50)	36 (250)

^* Oil pressures are given with the engine at operating temperature. With the engine cold, oil pressure may be higher. Individual engines may vary from the listed pressures; observe and record pressures when the engine is new to create a guide for checking engine condition.

Table 4.4, Minimum Engine Oil Pressure

Engine Oil Temperature Gauge

NOTICE

A sudden increase in oil 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 engine until the cause has been determined and corrected.

During normal operation, the optional engine oil temperature gauge should read:

200 to 260°F (93 to 126°C) for Detroit and Cummins engines

177 to 203°F (81 to 95°C) for Mercedes-Benz engines

Fuel Gauge, Pre-EPA10

The fuel gauge indicates the level of fuel in the fuel tank(s). A single fuel gauge is standard. If equipped with an optional second fuel tank, each fuel tank level is indicated on a separate gauge.

Fuel/Diesel Exhaust Fluid (DEF) Gauge, EPA10 and Newer

For engines that are EPA10-compliant or newer, the fuel and DEF levels are measured in a dual purpose fuel/DEF level gauge. See Fig. 4.9 .

1. Diesel Fuel Level Indicator
2. DEF Level Indicator
3. Low DEF Warning Lamp (amber below 10% DEF)
4. Low Fuel Warning Lamp (amber at 1/8 tank of fuel)

Fig. 4.9, Fuel/DEF Gauge, EPA10 and Newer

The diesel fuel level is indicated at the top of the gauge, with a low-fuel warning lamp that illuminates amber when the diesel fuel level registers 1/8th of capacity.

The DEF level is indicated in the lightbar on the lower portion of the gauge. There is a low DEF level warning lamp that illuminates amber when the DEF level reaches 10% of capacity. See Chapter 12 for details of the DEF gauge functions.

Primary and Secondary Air Pressure Gauges

If air pressure falls below minimum pressure, the braking ability of the vehicle will be limited. Slow the vehicle down and bring it to a gradual stop. Do not attempt to move the vehicle until air pressure has risen above the minimum level. Moving a vehicle without adequate braking power could cause an accident resulting in property damage, personal injury, or death.

Air pressure gauges register the pressure in the primary and secondary air systems. Normal pressure, with the engine running, is 100 to 120 psi (689 to 827 kPa) in both systems.

A low-air-pressure warning light or ICU4Me text message, along with an audible alert connected to both the primary and secondary systems, activates when air pressure in either system drops below approximately 70 psi (483 kPa).

When the engine is started, the warning light and audible warning remain on until air pressure in both systems exceeds minimum pressure.

Speedometer

Two speedometer options are available. The U.S. version of the speedometer registers speed in both miles per hour (mph) and kilometers per hour (km/h), with mph in larger numbers. The metric version of the speedometer face reverses this arrangement, with km/h in larger numbers.

Tachometer

The tachometer indicates engine speed in revolutions per minute (rpm) and serves as a guide for shifting the transmission and keeping the engine in the appropriate rpm range. For low idle and rated rpm, see the engine identification plate.

Tire Pressure Monitoring System (TPMS)

IMPORTANT: The use of temporary resealing or reinflation products containing internal sealers or propellants in any tire/wheel assembly, may adversely affect the operation of the tire sensor(s) and void the warranty.

The TPMS constantly monitors the pressure and temperature of each tire on the vehicle, and provides tire status information to warn the driver about a tire-related problem before it becomes dangerous. Tire sensors mounted on each wheel measure tire pressure and temperature every 12 seconds and transmit data every 3 to 5 minutes. If a tire pressure change of 3 psi (21 kPa) or greater is detected, the sensor breaks its regular schedule and transmits tire data immediately. The SmarTire™ display is shown in Fig. 4.10 .

For further information on the TPMS, including operation, TPMS warnings, and proper tire removal/installation, see the SmarTire TPMS Owner's Manual.

1. Warning Lamp
2. Display Screen
3. Wheel Button
4. Exit Button
5. Axle Button

Fig. 4.10, SmarTire Display

Transmission Fluid Temperature Gauge

The transmission fluid temperature gauge indicates the transmission lubricant operating temperature. Temperatures vary by application, but the transmission fluid temperature gauge reading should not exceed 250°F (121°C).

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.

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.

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.

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 right-hand pod of the steering wheel ( Fig. 4.11 ). See Fig. 4.11 . 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.

NOTE: To reset values in the ICU4M and ICU4Me driver message centers, press and hold the + switch.

Fig. 4.11, 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:

Odometer

Trip distance

Trip hours

Outside temperature

Parked Screens/Menus

The following screens and menus are available when the parking brake is on (when the vehicle is parked) and no active fault codes are found. Use the + and – switches on the steering wheel, or the mode/reset switch, to scroll through the driving screens. To reset any values, press and hold the + switch or the mode/reset switch. See Fig. 4.12 . The parked screens appear in the following order:

Odometer

Trip distance

Trip hours

Outside temperature

Temperature alert

Note: The engine oil level screen displays for Mercedes-Benz engines only (if equipped and enabled).

Fig. 4.12, ICU3 Parked Screens

Diagnostics

Clear screen (on vehicles with less than 255 miles on the odometer)

Engine miles/hours

Setup

Temperature Alert

When the outside temperature drops to 35°F (1.7°C) or less, the ICU displays a caution text at one-second intervals for five seconds, and an audible alert sounds. Tap the + or – switch on the steering wheel, or 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 35°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.

Diagnostics

When the DIAG screen is displayed, press and hold the mode/reset switch to access the various diagnostic screens. See Fig. 4.13 for a diagram of the diagnostic screens.

Fig. 4.13, ICU4 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.

Engine Miles/Hours

When the engine miles/hours screen is displayed, press and hold the mode/reset switch to access the engines screen submenu. See Fig. 4.13 for a diagram of the engine screens.

Fig. 4.14, ICU4 Setup Screens

Setup

The setup menu allows the driver to manage ICU parameters. The setup screen submenu allows the driver to enable and change service intervals. See Fig. 4.14 .

If service intervals are enabled and service distance or time has been exceeded, the text SERVICE HOUR/MI (KM) will display at start-up to indicate vehicle service is required.

For each parameter, press and hold the mode/reset switch to navigate to the parameter change screen. In each change screen, tap the mode/reset switch to toggle between options.

Use the last screen in the setup menu, RESET EE , to reset the parameters the ICU learns back to the default settings. Press and hold the mode/reset switch to reset the following learned parameters:

automated transmission display

seat belt switch learning

engine oil level

other electronic devices that have been removed from the vehicle (e.g. Qualcomm)

ICU4M

Functions

ICU4M settings and the driver message center are controlled with the + and – switches and the MY INFO switch, mounted on the dash. See Fig. 4.15 . Tap the MY INFO switch to drill down from each main screen to the submenus contained within it. Use the + and – switches to scroll through screens and select options. Tap the MY INFO switch again to exit each change screen.

Fig. 4.15, MY INFO Switch

With the parking brake off, only the odometer and alert messages can be displayed. Park the vehicle and set the parking brake to access the parked screens and menus.

Alert Messages

The driver message center displays alert messages when certain conditions occur. They are warnings, cautions, or other messages that require the driver's attention, but not all of them are critical to the operation of the vehicle.

NOTE: If there is more than one alert message to display, tap the + switch or the MY INFO switch to access the next message, and so on, until all messages have been viewed.

More important messages take priority over less important messages. The order of priority is:

parking brake set (with the vehicle moving)

parking brake off (with the door open)

low oil pressure or high coolant temperature

hard brake warnings (if equipped with roll stability advisor)

low battery voltage

ambient temperature below 35°F (1.7°C)

turn signal on

incoming instant or Qualcomm messages

service warnings

10.

no datalink activity

Incoming Message

On vehicles with a Qualcomm onboard communications system, a notification appears on the driver message center whenever a message is received.

NOTE: The incoming message screen also displays during the ignition sequence if a message is available.

This message displays for a preset time period, then returns after a preset interval until it is dismissed by the + and – switches or the MY INFO switch.

Parking Brake On

This warning message and an audible warning come on whenever the parking brake is applied and the vehicle is moving faster than 2 mph (3 km/h). See Fig. 4.16 . The screen and audible warning go away only when the parking brake is released, or speed is reduced below 2 mph.

Fig. 4.16, Parking Brake On Alert Message

Low Oil Pressure

This warning message and an audible warning come on whenever the oil pressure falls below the minimum oil pressure, whether the vehicle is idling or in motion. Tap the + and – switches or the MY INFO switch to dismiss the message.

If low oil pressure is detected during the ignition sequence, it displays as an active fault instead of an alert message. After 30 seconds, the message displays again.

High Coolant Temp

This message and an audible warning come on whenever the engine coolant temperature exceeds the maximum allowable temperature.

If high coolant temperature is detected during the ignition sequence, it displays as an active fault instead of an alert message. After 30 seconds, the message displays again.

Low Voltage

On some vehicles, this optional message and an audible warning come on whenever a low voltage condition is detected.

Turn Signal On

This warning message and audible warning come on whenever the turn signal remains on for four minutes or five miles of travel. To dismiss this message, either turn off the turn signal or tap the + and – switches or the MY INFO switch.

Air Temperature

When the outside air temperature drops below 35°F (1.7°C), a warning text is displayed at one-second intervals for five seconds, and an audible warning will sound. Tap the + and – switches or the MY INFO switch to acknowledge the warning. The alert message will not occur again unless the temperature cycles above 37°F (4°C) and back below 35°F (1.7°C). This warning only occurs while the ignition is on and the parking brake is off.

Service Warnings

Service warning alerts display during the ignition sequence and indicate if a service interval has been reached or exceeded and maintenance is required. The messages may indicate the number of miles (KM) or hours until the next required service or, once passed, the number of miles (KM) or hours since maintenance should have been performed.

Automated Transmission Display

The ICU4M can display current gear information for vehicles with an automated transmission. The last three digits at the far right on the lower line of the driver message center are reserved for this information.

When a shift request is made by the driver, an up or down arrow is also displayed, depending on the shift direction.

For more information about specific models of automated transmissions, see Chapter 15 .

Driving Screens

The following screens are available when the parking brake is off (when the vehicle is mobile).

Fasten seat belt (rpm<100)

Fuel economy (rpm>100)

Fig. 4.17, ICU4M Driving Screens

Odometer

Trip distance/hours

Trip advisory

Leg distance/hours

Leg advisory

Fuel used/average MPG (KM/L)

Outside air temperature

Favorite Screen

The driver can set a favorite driving screen using the MY INFO switch. Press and hold the lower half of the MY INFO switch for just over one second to set the current screen as the favorite screen. A chirp will sound to verify the screen has been set.

Tap the lower half of the MY INFO switch to access the favorite screen. Tap the MY INFO switch again to leave the favorite screen.

NOTE: Only driving screens can be set as the favorite screen.

Parked Screens/Menus

Tap the MY INFO switch to drill down from each main screen to the submenus contained within it. Use the + and – switches to scroll through screens and select options. Tap the MY INFO switch again to exit each change screen. Press and hold the + switch or the upper half of the MY INFO switch to reset the counters for trip and fuel information.

The following screens are available when the parking brake is on (when the vehicle is parked). See Fig. 4.18 .

Odometer

Fig. 4.18, ICU4M Idle Hours, Trip Information, Fuel Information, and Engine Information Screens

Trip information including trip miles/hours, idle hours, average speed, leg miles/hours

Fuel information including fuel used, fuel economy, idle/PTO fuel usage

Engine information including engine miles/hours, engine/PTO gallons, oil level

Diagnostic information

Service information including mileage or time to next service

Setup information

Vehicle information including Datalink status, ICU serial number, software version

Outside air temperature

Fasten seat belt warning

Trip Information

Trip Information displays the trip miles, trip advisories, idle hours, leg miles, and leg advisories, in that order.

Fuel Information

Fuel information displays total fuel usage since the last reset, fuel mileage, and fuel consumed while idling or running the PTO, in that order.

Engine Information

Engine information displays engine mileage and hours, and total fuel consumption, in that order.

Diagnostic Information

If active fault codes are displayed on the diagnostic information screens, make a note of the fault code and text message, then take the vehicle to an authorized Freightliner service facility See Fig. 4.19 for a diagram of the diagnostic information screens.

Fig. 4.19, ICU4M Diagnostic Information and Service Information Screens

Service Information

The Service Information menu displays the next service interval, expressed in either miles or hours. See Fig. 4.19 . Service intervals can also be deactivated. For programming service intervals, see Setup Information , below.

NOTE: If the vehicle has exceeded the service interval, the miles(km)/hours remaining screen is replaced by the service was due screen, followed by the number of miles(km)/hours since the service was due.

Setup Information

The Setup Information menu allows the driver to program various features of the ICU4M. See Fig. 4.20 .

Fig. 4.20, ICU4M Setup Information Screens

The setup features include:

Service intervals (OFF/MILES/HOURS)

Outside temperature warning (ON/OFF)

Target MPG

LCD lamp (ON/OFF)

Driver message center brightness

Language (English/French/Spanish)

Units of measurement (English/Metric)

Driver select (ON/OFF)

Reset parameters to original settings

Vehicle Information Screens

The vehicle information screens display hardware and software information, including the Freightliner part number and switch ID of the ICU. See Fig. 4.21 .

Fig. 4.21, ICU4M Vehicle Information Screens

ICU4Me

Functions

ICU4Me settings and the driver message center are controlled using the ICU4Me control switch located on the dash, and the + and – switches mounted in the right-hand pod of the steering wheel. See Fig. 4.22 and Fig. 4.11 .

Fig. 4.22, ICU4Me Control Switch

The driver message center is divided into four sections. The odometer and cruise control status field are displayed along the bottom of the message center. When cruise control is active, the cruise control status field displays relevant cruise control icons and the set speed. If the vehicle is equipped with a manual transmission, time and temperature are displayed in the top left corner of the driver message center. The message field displays the driving screens and alert messages. See Fig. 4.23 .

If the vehicle is equipped with an automated transmission, the gear display is located in the top left corner of the driver message center. Time and temperature are displayed in the message field, unless an alert message is active or a driving screen has been selected. The odometer and cruise control status field are displayed along the bottom of the message center. See Fig. 4.24 . For information about transmission display options, see Chapter 15 .

1. Temperature and Compass
2. Message Field
3. Cruise Control Status Field
4. Odometer

Fig. 4.23, Driver Message Center Without Gear Display, ICU4Me

1. Gear Display
2. Temperature and Compass
3. Cruise Control Status Field
4. Odometer

Fig. 4.24, Driver Message Center with Gear Display, ICU4Me

Alert Messages

Alert messages are displayed in the message field to notify the driver when certain conditions occur. They include warnings, cautions, and other messages that require the driver’s attention. Not all alert messages are critical to the operation of the vehicle. More important messages take priority over less important messages.

NOTE: All alert messages follow the format shown in Fig. 4.25 .

Fig. 4.25, Parking Brake Alert Message

Press the + switch to acknowledge alert messages and revert to the previously displayed driving screen. The following alert messages will repeat intermittently until the condition is eliminated:

turn signal on

low voltage

no datalink

low transmission air pressure (Detroit transmissions only)

Driving Screens

Use the + and – switches on the steering wheel to navigate through the driving screens.

Fig. 4.26, Driving Screen Navigation, ICU4Me

With the parking brake off, only the driving screens are available. Use the + and – switches on the steering wheel to scroll through the driving screens; see Fig. 4.26 . To reset any values, press and hold the + switch.

Temperature

MPG information

Trip information

Leg information

Gauge display (if selected)

Predictive Cruise Control (optional)

Enter parked menus

Parked Screens/Menus

Park the vehicle and set the parking brake to access the parked menus and submenus. See Fig. 4.27 . To reset values in any of the menus, press and hold the + switch.

Trip information

Fuel information

Engine information

Diagnostics

Service information

Settings

Use the + and – switches on the steering wheel to navigate through the parked menus.

Fig. 4.27, Parked Menus, ICU4Me

ICU Information

A small numerical fraction is displayed in the upper right-hand corner of each screen to indicate the number of available screens or options to scroll through. See Fig. 4.28 . Press the upper half of the ICU4Me control switch to select a menu choice. Press the lower half of the control switch to back out of a selected menu or submenu. Use the + switch to scroll up, and the – switch to scroll down.

Fig. 4.28, Parked Menu Navigation, ICU4Me

When navigating the parked menus, the left side of the driver message center displays a "breadcrumb menu" to show the order of menus and submenus that have been selected during the current navigation.

Trip Information

The ICU can record data for one trip segment and one leg segment. When trip information is reset, all the leg information is reset as well.

Fuel Information

Using this menu, the driver can view the total fuel used since the last reset, the total idle gallons used since the last reset, and the average MPG since the last reset.

Engine Information

Using this menu, the driver can view engine miles, engine hours, gallons used, PTO hours, and PTO gallons. Engine oil level is optional for Detroit engines. The information contained in the Engine Information screens cannot be reset.

Diagnostics

Active and historical faults are displayed in the diagnostics menu. See Fig. 4.29 . If there are any active faults, the total number of faults is displayed in parenthesis next to the affected controller. To view specific active faults, press the upper half of the ICU4Me control switch on the dash. Press the upper half of the ICU4Me control switch to toggle between the text description and the failure code for each selected fault.

Fig. 4.29, Diagnostics Menu Navigation, ICU4Me

Service Information

Using this menu, the driver can enable, disable, and set service intervals for engine miles or engine hours. After enabling service intervals, select interval unit (miles or hours), and the interval duration.

Settings

The settings menu contains the controls for the following settings:

Display (includes brightness, contrast, display light, and night mode settings)

Gauge select

Language

Time zone

Self-test

Temperature warning enable/disable

Units

The Gauge Select submenu allows the driver to select certain gauge values for display in the message field while driving, See Fig. 4.30 . Use the + and – switches on the steering wheel to scroll through the list of available gauges, then press the upper half of the ICU4Me control switch to select a desired gauge. The ICU4Me control switch can also be used to uncheck boxes if necessary.

Using the Time Zone submenu, the driver can select supported time zone. Use the + and – switches to increment between time zones, see Fig 4.31 and Fig 4.32 . Press the upper half of the ICU4Me control switch to select the desired time zone. Press the lower half of the control switch to back out of a selected menu or submenu. See Tablet1-4040xx for supported time zone list.

Once the operator has selected the time zone, the operator will be able to enable or disable the Daylight Savings, see Fig 4.33 . When the Daylight Savings is ‘ON’, a pop-up confirmation screen shall confirm the time by displaying the time the operator selected and 1 hour shall be subtracted from the current time which would make the offset for PST -7:00 hours instead of -8:00 hours.

When the Daylight Savings is selected as ‘OFF’ then no offset shall be applied to the current time.

Fig. 4.30, Selecting Gauges to Display, ICU4Me

Fig. 4.31, Time Settings

Fig. 4.32, Time Zone Selection

Fig. 4.33, Enable or Disable Daylight Savings

Time Zone	Abbreviation	From UTC (DST Off)	DST On	ICU4Me Display
Eastern Brazilian Time	EBT	-3:00	-2:00	East. Brazilian
Newfoundland Time	NT	-3:30	-2:30	Newfoundland
Atlantic Standard Time	AST	-4:00	-3:00	Atlantic Std.
Eastern Standard Time	EST	-5:00	-4:00	Eastern Std.
Central Standard Time	CST	-6:00	-5:00	Central Std.
Mountain Standard Time	MST	-7:00	-6:00	Mountain Std.
Pacific Standard Time	PST	-8:00	-7:00	Pacific Std.
Yukon Standard Time	YST	-9:00	-8:00	Yukon Std.
Alaska-Hawaii Standard Time	AHST	-10:00	-9:00	Hawaii Std.
Nome Time	NT	-11:00	-10:00	Nome Time
International Date Line West	IDLW	-12:00	-11:00	Western Date Line

Table 4.5, Supported Time Zones

ICU Information

The ICU Information screen displays the part numbers for the instrument cluster and software.

Overhead Instrument Panel

The optional overhead instrument panel may hold a citizen's band (C/B) radio and any switches that can not be accommodated on the driver's or auxiliary dash panels.

The underside of the overhead console also holds the sun visors and the optional dome/reading light asssembly. See Chapter 5 for more information on the dome/reading light assembly.