Mini_DV6 engine cooling

Engine cooling, components and software information:

The cooling of the present MINI diesel engine is controlled by a sensor-actuator combination, whereby the current temperature of the engine is delivered by a temperature-dependent resistor sensor. Active cooling is achieved by operation of the two-stage electric fan which cuts in automatically as required.

The engine temperature is indicated approximately by the coolant temperature. The sensing of the engine temperature is necessary for, among other things:

• Mechanical engine protection
  
• Calculation of the oil dilution and critical oil mass
  
• Alternator shutdown control
  

Service instructions and component information: Temperature sensor

A two-pin temperature sensor is fitted in the present engine. The installation location is on the top side of the engine towards the fresh air intake, directly behind the air filter. The following target values apply:

• Cable and plug connection:
  Pin 1: Resistance value
  Pin 2: Earth
  
• Rated voltage: Vcc = 5.0 V +/- 5 % Volt
  
• Selected parameters TMOT sensor (tolerance at 25 degrees Celsius approx. 2.5 %):
  -30 degrees Celsius -> 88.5 kOhm
  -20 degrees Celsius -> 48.5 kOhm
  -10 degrees Celsius -> 27.6 kOhm
  -5 degrees Celsius -> 21.1 kOhm
  0 degrees Celsius -> 16.3 kOhm
  5 degrees Celsius -> 12.7 kOhm
  10 degrees Celsius -> 9.9 kOhm
  15 degrees Celsius -> 7.85 kOhm
  20 degrees Celsius -> 6.24 kOhm
  25 degrees Celsius -> 5.00 kOhm
  35 degrees Celsius -> 4.02 kOhm
  45 degrees Celsius -> 2.18 kOhm
  55 degrees Celsius -> 1.49 kOhm
  60 degrees Celsius -> 1.24 kOhm
  70 degrees Celsius -> 876 Ohm
  80 degrees Celsius -> 629 Ohm
  90 degrees Celsius -> 459 Ohm
  100 degrees Celsius -> 340 Ohm
  110 degrees Celsius -> 255 Ohm
  120 degrees Celsius -> 195 Ohm
  130 degrees Celsius -> 150 Ohm
  

Diagnosis instructions:

To check the functionality of the electric fan, the test module <Engine cooling> / <Electric fan> as well as the control unit function <Component activation> / <Electric fan> can be used. If the activation does not cause the fan to rotate, it is highly likely that there is a cable or component defect.