Component description Temperature sensors for charge air, coolant and fuel Turbo air (51.27421–0077) Diagram R=f (- н ) 1 2 Plug connection Coolant temperature sensor, Fuel temperature sensor (51.27421–0113) Diagram R=f (- н ) 2 3 Plug connection Function The temperature sensors for charge air, coolant and fuel are NTC resistors. The coolant temperature sensor is in the coolant circuit below the heat exchanger. The charge air temperature sensor is in the charge air circuit downstream of the intercooler. The fuel temperature sensor is in the fuel circuit at the injection pump. They supply the control unit with information on the coolant, fuel and charge-air temperatures. 18