GF54.30-P-3020PP Displaying Coolant Temperature, Function

GF54.30-P-3020PP Displaying Coolant Temperature, Function
- MODEL 203 Applicable to 31.5.03






CAN-C Engine compartment CAN bus
A1 Instrument cluster
A1p13 Multifunction display
B11/4 Coolant temperature sensor
N3/9 CDI control unit
N3/10 ME-SFI [ME] control unit

Readout of coolant temperature in the display






Displaying the coolant temperature
At the driver's request the coolant temperature is shown as a bar chart in the multifunction display (A1p13). If the default screen of the display is showing (total mileage and trip odometer), the scrolling forwards and backwards button (S110s1) needs to be pressed once in the direction of scroll forwards using the (down arrow) button to do this.
This display is a plateau display. This means the bar stops at 95 °C for temperatures between 95 °C and 115 °C.

Temperatures within this temperature range are not critical. The correct temperature is only displayed once the temperature reaches 116 °C. This is to prevent the driver from being unnecessarily disturbed by the display, for example, at high outside temperature.
The warning range starts at 130 °C. As of 130 °C the coolant temperature and the warning mess age "COOLANT STOP. ENGINE OFF appear s automatically in the multifunction display (A1p13). A warning signal also sounds.

Networking:
- The coolant temperature sensor (B11/4) changes its resistance according to the coolant temperature. The sensor is an NTC resistance which means the resistance decreases as the temperature increases.
- The resistance of the coolant temperature sensor (B11/4) is read in by the motor electronics control unit (N3/10) or by the CDI control unit (N3/9).
- The motor electronics control unit (N3/10) or CDI control unit (N3/9) converts the resistance values of the coolant temperature sensor (B11/4) into a temperature value and places this on the engine compartment CAN (CAN-C).
- The instrument cluster (A1) reads in this temperature value from the engine compartment CAN (CAN-C) The coolant temperature is shown in the multifunction display (A1p13) when called up.