Coolant temperature: Notes
The coolant temperature gauge gives the driver information on engine coolant temperature.
The main instrument unit receives information from the temperature sensor, which is located on the left -hand side of the cylinder head and is in contact with the engine coolant. The sensor is NTC type. The main instrument unit measures the engine coolant temperature by supplying the sensor with 5 V from pin 15 (K22) through an integrated 680 ohm resistor. The sensor is grounded via main instrument unit pin 7 (K22). The voltage across the resistor in the main instrument unit is proportional to the engine coolant temperature. Information on the current engine coolant temperature is sent on the bus.
The coolant temperature gauge's scale is divided into 5 fixed breakpoints. The main instrument unit is programmed to move the gauge needle to the fixed breakpoints at certain specific temperatures to give a steady reading at normal coolant temperatures.
The following breakpoints are programmed in the main instrument unit (factory setting):
| Gauge needle: | Coolant temperature |
| -into "blue" zone | 30°C (fixed value) |
| -out of "blue" zone | 50°C |
| -into "horizontal" position | 80°C |
| -out of "horizontal" position | 115°C |
| -into "red" zone | 129°C |
| -out of "red" zone | 130°C (fixed value) |