GF54.30-P-3044RIT Trip Computer, Function

GF54.30-P-3044RIT Trip Computer, Function
- with CODE (P99) Special model "AMG Black Series"

General function requirements
^ Circuit 15 On

The status of circuit 15 is sent by the EIS [EZS] control unit (N73) to the interior CAN (CAN B).

Trip computer (TRIP) position in general
The trip computer provides data and information on average fuel consumption, trip time, average speed, travel distance and remaining range.
The trip computer provides the following display screens:
- "After start" (short-distance memory)
- "After reset" (long-distance memory)

The following content can be shown on the trip computer:
- In the left multifunction display (A1p13):
- Selected display screen "After start" or "After reset"
- Travel distance driven "After start" or "After reset"

- In the right multifunction display (A1p15):
- Average speed traveled
- Time elapsed "After start" or "After reset"
- Average consumption

The displayed information relates to the time of the last short-distance memory or long-distance memory reset.

The corresponding display screen can be selected by scrolling with the scroll forward and back button (S110s1) and then selecting with the system selection button (S110s3).
The steering column tube module (N80) reads in the corresponding selection over the local interconnect network (LIN) and sends it over the interior CAN (CAN B) to the instrument cluster (A1). The trip computer is comprised of the following subfunctions:
^ Kilometer/miles switchover function sequence
^ Display of travel distance function sequence
^ Function sequence for travel time display
^ Function sequence for the average speed display
^ Function sequence for fuel consumption display
^ Function sequence for range display
^ Function sequence for reset display

Kilometer/miles switchover function sequence
The trip computer uses the distance unit set in the instrument cluster. The dimensional units (kilometers or miles) are switched over via the selection "Settings" in the left multifunction display.

Display of travel distance function sequence
The traveled distance is calculated in the instrument cluster using the wheel speeds.
The wheel speeds are recorded by the following components:
- Left front rpm sensor (L6/1)
- Right front rpm sensor (L6/2)
- Left rear rpm sensor (L6/3)
- Right rear rpm sensor (L6/4)

The ESP, SPS [PML] and BAS control unit (N47-5) reads in the signals of the rpm sensors directly and forwards them over the engine compartment CAN (CAN C) to the instrument cluster. The instrument cluster receives the signals from the rpm sensors and calculates the current travel distance.

The travel distance display is dependent on the setting and coding of the instrument cluster's national version:
- Kilometers (e.g. Europe, Japan)
- Miles (e.g. USA, Australia)

The travel distance is displayed in a range of 0 to 65,535 km or 0 to 40,959 miles with a resolution of one kilometer or one mile. If the travel distance display exceeds the maximum display value (65,535 km or 40,959 miles), the travel distance is automatically reset to 0.

Function sequence for travel time display
The travel time is the time measured internally in the trip computer since the last reset of the short distance memory or long distance memory.
The travel time is shown in the right multifunction display. If the travel time display exceeds the maximum display value (99.59 hours), the travel time is automatically reset to 0.

Additional function requirements for average speed display
^ Engine running (circuit 61 ON)

Function sequence for the average speed display
The trip computer calculates the average speed from the ratio between the travel distance driven and the time passed (trip time) since the last reset of the short-distance memory or long-distance memory.
The circuit 61 status is sent by the ME-SFI [ME] control unit (N3/10) to the engine compartment-CAN.
The average speed display depends on the setting on the instrument cluster:
- "km/h" (kilometers per hour)
- "mph" (miles per hour)

The speed display has an accuracy of one kilometer per hour or one mile per hour and is updated once per second. The display range is v = 0 to 260 km/h or 0 to 160 mph.

Additional function requirements for fuel consumption display
^ Circuit 61 ON (provided by ME-SFI [ME] control unit)

Function sequence for fuel consumption display
The trip computer calculates the fuel consumption using the following information:
- Consumption signal from ME-SFI [ME] control unit
- Travel distance covered "After start" or "After reset"

Depending on the setting and coding of the national version of the instrument cluster the fuel consumption is displayed in:
- "l/100 km" (liters per 100 kilometers)
- "mpg" (miles per gallons)
- "km/l" (kilometers per liter)

The relevant information on fuel consumption is sent by ME-SFI [ME] control unit over the engine-compartment CAN to the instrument cluster.

Due to the different travel distances stored in the short distance memory or long distance memory, the values displayed in the "After start" and "After reset" display screens can differ because they are based on different data records.

Function sequence for range display
The trip computer determines the expected range from the ratio between the current tank capacity and the average fuel consumption.
The current tank content is recorded by the fuel level indicator sensor (B4). The rear SAM control unit (N10/8) reads in the data directly from the fuel level indicator sensor and sends the data over the interior CAN to the instrument cluster.

The average fuel consumption is gathered from the short-distance memory or long-distance memory.
The range is displayed after activating the "Range" display screen in the left multifunction display in kilometers or miles to match the setting in the instrument cluster.

The range is updated in increments of one mile or one kilometer. In addition to the range, the remaining tank content is displayed in liters or gallons depending on the country coding. Updates are performed in increments of one liter or 0.2 gallons.

Function sequence for reset display
The trip computer can be reset when the instrument illumination brightness control and reset button (A1r1) is pressed. The reset function is comprised of the following subfunctions:
^ Function sequence for manual reset
^ Function sequence for automatic reset

Function sequence for manual reset
The following actions must be performed in the order listed to manually reset the long or short distance memory:
- Switch on circuit 15
- Select "After start" or "After reset" display screen
- Actuate instrument illumination brightness control and reset button for one second

Function sequence for automatic reset
The data from the "After start" short distance memory are reset after t = 4 h has expired in the instrument cluster.