Coolant level sensor MGS low water level
• Check that the coolant level is within an acceptable range in the expansion tank for the power electronics cooling system. If the level is too low check for leakages. If glycol or traces of glycol is found in the HRU/HPU, piping within the bus body to the inverter the leakage has to be located and repaired. • Run “deaeration mode” for the power electronics cooling pump. Refill coolant if necessary. • Check that T182 is connected. • Check that E81-B is connected. • Check that the cable harness by measuring that E81-B13 is connected to T182-B, E81-B10 is connected to T182-A and E81-B15 is connected to T182-C. If there is no connection, change the cable. • Apply 24V on the component with + on T182-B and – on T182-A and measure the outgoing voltage between T182-A and T182-C. If the voltage is >2V, change the sensor. • Change the BMU(E81)
What you'll see
No driver-visible symptom recorded.
System reaction
• Coolant pump MGS stops, the hybrid power is reduced to prevent over temperature in the MGU or DCC. • Amber warning lamp "Hybrid System Fault" is shown in ICL
Diagnostic depth
Coolant level sensor signal
•Leakage. •Temperature change. •Previous air pockets collapsed. •Sensor not connected •Sensor malfunction.