GF54.30-P-3041SX Display Operating Conditions, Function

GF54.30-P-3041SX Display Operating Conditions, Function

Component Identification:

General
The fuel level and reserve indicator is located in the left of the Instrument cluster and is designed as an analog display. The fuel level and reserve indicator is driven by a stepper motor. If the "circuit 15 ON" status exists, the pointer of the fuel level and reserve indicator is run up slowly to the respective value.

Refueling recognition of fuel level and reserve indicator with "circuit 15 OFF"
If the vehicle is refueled with "circuit 15 OFF", the fuel level and reserve indicator is updated when the "circuit 15 ON" state exists again, provided that approx. 3 liters of fuel have been added.

Refueling recognition of fuel level and reserve indicator with "circuit 15 ON"
With "circuit 15 ON", the current tank content is displayed on the fuel level and reserve indicator.

If the vehicle is refueled with "circuit 15 ON", the fuel level and reserve indicator is not updated until approx. 7 liters of fuel have been added.

The fuel level and reserve indicator is always updated after a delay and the pointer of the fuel level and reserve indicator always runs up to the new fuel value slowly. This ensures that fluctuations in the fuel level resulting from vehicle movement are not shown on the fuel level and reserve indicator.

Reserve indication range
If the reserve range is reached, the fuel reserve warning lamp lights up yellow. The lamp is triggered with a delay period to prevent the lamp flickering. The tank contents are still approx. 12 l when the fuel reserve warning lamp lights up.

Information flow and networking
The flow of information is as follows:
^ The left tank half fuel level sensor and right tank half fuel level sensor measure the tank capacity and are read in by the rear SAM control unit with fuse and relay module.
^ The signals from the fuel level sensor, left tank half and fuel level sensor, right tank half are converted into a percent value by the Rear SAM control unit with fuse and relay module and interior CAN.
^ The central gateway control unit reads in the signals from the interior CAN and places them on the central CAN.
^ The Instrument cluster receives these signals from the central CAN and actuates the stepper motor of the fuel level and reserve indicator corresponding to the tank contents

Jammed fuel tank sensor recognition
The jammed fuel tank sensor recognition function becomes active after the vehicle has covered a distance of s > 160 km. Tank sensor seized is detected, if the sensor resistance value of the Left tank half fuel level sensor or right tank half fuel level sensor does not change by at least a defined resistance value within a certain distance.
If this condition occurs, a corresponding fault bit is set in the fault memory of the rear SAM control unit with fuse and relay module. The erroneous bit is erased again if the requested change in resistance value of the left tank half fuel level sensor or right tank half fuel level sensor has occurred.

If a fault occurs, the pointer of the fuel level and reserve indicator moves to the beginning of the scale. The fuel reserve indicator lamp is not actuated.

Component Identification:

The outside temperature indicator takes account of the following data to display the temperature value:
^ Outside temperature value
^ Vehicle speed signal
^ Coolant temperature
^ Engine running time

The instrument cluster processes this data and actuates the outside temperature indicator in the multifunction display accordingly. The outside temperature indicator is actuated as of circuit status "circuit 15 ON".
The fact that the outside temperature indicator is dependent on the outside temperature, coolant temperature, vehicle speed and engine operating time prevents too high a temperature as can be caused by engine heat dissipation being displayed when the vehicle is stationary or driving slowly.

coolant temperature < 60 °C
When the coolant temperature is < 60 °C, the current outside temperature value is displayed continuously when the instrument cluster is activated.

Coolant temperature ≥60 °C
If the coolant temperature is ≥60 °C, with a status change from "Circuit 15 ON" to "Circuit 15 OFF" the temperature value last measured is stored and displayed in the instrument cluster. When the instrument cluster is activated, the stored temperature is always displayed. If the measured outside temperature drops below the stored value, the current measured temperature is displayed with a delay period of 8 s.
When the vehicle is being driven, the delay periods also depend on the vehicle speed:
^ At speeds of 20 to 45 km/h rising outside temperatures are displayed after a delay period of 3 minutes.
^ At speeds > 45 km/h rising outside temperatures are displayed after a delay period of 90 s.
^ With a reduction in speed < 20 km/h the display is only changed when the measured outside temperature value drops.
If the instrument cluster does not receive a valid coolant temperature from the central CAN, the outside temperature is determined in the same way as for a coolant temperature ≥60 °C.

Rising outside temperature with engine OFF following engine running period
If the outside temperature rises above the stored value with the engine OFF, the outside temperature currently measured is only shown in the outside temperature indicator of the multifunction display after 6-times the engine running time, however after a maximum of one hour.

If the coolant temperature drops below 60 °C, the delay time counter is canceled immediately and rising temperatures are shown in the outside temperature indicator of the multifunction display.

Example: Delay period for outside temperature indicator
The preceding engine running time was 5 minutes. The delay time is then 6 X 5 minutes. The current temperature is thus only displayed after 30 minutes.

If the engine running time was more than 10 minutes, a maximum of 10 minutes is taken into account when calculating the delay time. The maximum delay period is thus 60 min.

Information flow and networking
Reading in the data required for the coolant temperature value:
^ The coolant temperature sensor changes its resistance corresponding to the coolant temperature. The sensor has a negative temperature coefficient (NTC) resistance, i.e. the resistance reduces as temperature increases.
^ The resistance of the coolant temperature sensor is read in by the ME-SFI [ME] control unit or by the CDI control unit (N3/9) (model 221).
^ The ME-SFI [ME] control unit or CDI control unit (model 221) converts the measured resistance values of the coolant temperature sensor into a temperature value and places this on the chassis CAN.
^ The central gateway control unit reads in the signals from the chassis CAN and places them on the central CAN.
^ The instrument cluster reads in the signals from the central CAN and processes them.

Reading in data required for the outside temperature value:
^ The outside temperature indicator temperature sensor changes its resistance according to the outside temperature. The sensor is an NTC resistor.
^ The resistance value of the outside temperature display temperature sensor is read in discretely by the front SAM control unit with fuse and relay module.
^ The front SAM control unit with fuse and relay module places the signal on the interior CAN.
^ The central gateway control unit reads in the signals from the interior CAN and places them on the central CAN.
^ The instrument cluster reads in the signals from the central CAN and processes them.

Reading in the data for the vehicle speed signal:
^ The left front rpm sensor, right front rpm sensor, left rear rpm sensor and right rear rpm sensor are read in by the ESP control unit.
^ The ESP control unit places the rpm sensor signals on the chassis CAN.
^ The central gateway control unit reads in the signals from the chassis CAN and places them on the central CAN.
^ The instrument cluster reads in the signals from the central CAN and processes them.

The Instrument cluster processes all the data received and actuates the outside temperature indicator in the multifunction display.

Range
The display range is -40 to +85 °C or -40 to +185 °F. The resolution of the outside temperature indicator is 0.5 °C or 1 °F. If the outside temperature measured exceeds the display range the maximum display value of the display range is shown. If the outside temperature measured drops below the display range, the minimum display value of the display range is shown.

Adjustment from degrees Celsius (°C) or degrees Fahrenheit (°F)
The dimensional unit of the outside temperature indicator is adjusted at the end of the assembly line to (°C) or (°F) depending on the country.

Component Identification:

General
The coolant temperature display is located on the left of the instrument cluster and is designed as an analog display. The display is driven by a stepper motor. It is actuated as of circuit status "Circuit 15 ON".

Fault behavior
If the Controller Area Network (data bus/CAN bus) (CAN) signal is defective or if the instrument cluster does not receive a coolant temperature signal, the pointer is moved back to the start of the scale in a damped manner. In addition an erroneous bit is set in the fault memory of the instrument cluster.

Networking and information flow
Information flow, engine fan defective:
^ If there is a defect in the engine fan, a fault signal is placed on the chassis CAN by the ME-SFI [ME] control unit or by the CDI control unit (model 221).
^ The central gateway control unit reads in the signal from the chassis CAN and places it on the central CAN.
^ The instrument cluster reads in the signal from the central CAN and processes it

Component Identification:

Display range of the coolant temperature display in normal mode (plateau characteristic):
^ In the measured coolant temperature range of ≥0 °C to < 120 °C the values of the plateau characteristic are displayed in the coolant temperature display.
^ In the measured coolant temperature range of ≥120 °C to < 130 °C the values of the plateau characteristic are displayed in the coolant temperature display.
^ In the measured coolant temperature range of ≥130 °C the pointer of the coolant temperature display is controlled at the scale end value.

The plateau characteristic should prevent the driver being unnecessarily disturbed by a high temperature but one which is not critical for the vehicle, e.g. at a high outside temperature.

If the engine fan is defective the plateau characteristic is exited and the measured coolant temperature is always displayed in the coolant temperature display.

Warning range
The warning range of the coolant temperature display highlighted in red starts at 120 °C.
If the coolant temperature is too high a warning is output in the multifunction display and in addition a warning tone sounds.

Component Identification:

General
The tachometer is located in the right of the instrument cluster and is designed as an analog display. The display is driven by a stepper motor.

Networking
The flow of information is as follows:
^ The rpm is recorded by the crankshaft Hall sensor.
^ The signals from the crankshaft Hall sensor are read in by the ME-SFI [ME] control unit or by the CDI control unit (model 221) and placed on the chassis CAN.
^ The central gateway control unit reads in the signals from the chassis CAN and places them on the central CAN.
^ The instrument cluster receives these signals from the central CAN and actuates the tachometer stepper motor corresponding to the rpm.

In the event of the implausible values from the CAN the pointer of the tachometer is controlled to the start of the scale. An error message is also stored in the fault memory.

Component Identification:

Calculation of mileage
The travel distance is derived from the speed of the vehicle and the length of time that the respective speed was maintained.

Information flow and networking
Reading in the data for the vehicle speed signal:
^ The left front rpm sensor, right front rpm sensor, left rear rpm sensor and right rear rpm sensor are read in by the ESP control unit.
^ The ESP control unit places the rpm sensor signals on the chassis CAN.
^ The central gateway control unit reads in the signals from the chassis CAN and places them on the central CAN.
^ The instrument cluster reads in the signals from the central CAN, calculates the vehicle speed from them and places them on the central CAN.

The time period is determined internally in the instrument cluster.

Displaying the total mileage
The total mileage is a 6-digit display in kilometers or miles in the basic display of the multifunction display as soon as the instrument cluster has been activated.
The range for the main odometer is from 0 to 999,999 kilometers or miles. If the maximum mileage is reached, the counter is not reset to 0 kilometers or miles. The instrument cluster must be replaced in this case.

Displaying the trip mileage
The trip odometer is a 5-digit display in kilometers or miles in the basic display of the multifunction display as soon as the instrument cluster has been activated.
The range for the trip odometer is from 0 to 9999.9 kilometers or miles. Once the maximum reading is reached the display reverts to 0 kilometers or miles.

Resetting the trip odometer
In order to reset the trip odometer, the instrument cluster must be activated and the basic display of the trip computer (RRE) must be shown.
The trip odometer is reset to 0 km or miles by pressing "Back" and SBS off button (S110s4) for at least 3 seconds.

Storage of data
When the on-board electrical system battery is disconnected the main odometer reading remains stored G1 for at least 5 years in the instrument cluster memory and in the memory of the EIS [EZS] control unit (N73).
The trip odometer is also protected against data loss when the onboard electrical system battery is disconnected.

Fault behavior and shutdown interlock:
^ A shutdown interlock protects the odometer against speed values which are not in the plausible range.
^ In the event of a defective rpm sensor fault value is placed on the CAN by the ESP control unit. The instrument cluster receives this fault value and determines the travel distance from the remaining rpm values. In addition, an erroneous bit is set for the faulty rpm sensor in the fault memory.
^ If the instrument cluster cannot receive a valid speed signal via the central CAN, the mileage display is set to the value 0 km or miles in the multifunction display or miles and a fault bit is set in the fault memory.

Component Identification:

Gear indicator in instrument cluster in sport program "S" and in comfort program "C"
It shows the driver the currently selected shift range "1", "2", "3", "4", "5", "6" or selector lever position "D", "R", "N" (neutral) or "P" (park).

Gear indicator in the instrument cluster in manual program "M", on vehicles except code (494) USA version
It shows the driver the engaged gear "1", "2", "3", "4", "5", "6", "7".

The arrows in the gear indicator show the driver which permissible gear selector switch position he can change to. The decisive factor here is whether the speed, at which the vehicle is moving, is under or above the speed threshold of 5 km/h.

Transmission mode display in instrument cluster
It indicates to the driver the program selection (S16/5) program selection "S" (Sport-program), "C" (comfort program) or "M" (manual program) performed at the driving mode switch (on vehicles except code (494) USA version).