GF54.30-P-3020T Display Coolant Temperature, Function

GF54.30-P-3020T Display Coolant Temperature, Function

Component Identification:

Function overview
The coolant temperature sensor (B11/4) is an NTC resistor which reduces its resistance value as temperature increases.
The resistance of the coolant temperature sensor (B11/4) is read via the ME-SFI control unit (N3/10) or the CDI control unit (N3/9) and is relayed onto the engine compartment CAN as a CAN message.
The instrument cluster (A1) reads in this temperature from the engine compartment CAN and controls the engine coolant temperature gage (A1p1) accordingly. If necessary, a warning message also appears on the multifunction display (A1p13).

Displaying coolant temperature
The status display for the engine coolant is located on the right-hand side of the instrument cluster (A1).
The display is a segment display.
After the instrument cluster (A1) has been woken, one segment is actuated at temperatures < 40 °C; at higher temperatures the segments are actuated according to the values measured by the coolant temperature sensor (B11/4). The display is held at 95 °C for input values from 95 °C to 115 °C.

The system responds to a defective radiator fan by leaving the characteristic curve and reverting to a display that also shows temperatures between 96 °C and 116 °C.