Coolant Pump 2 wrong behavior
• Check the coolant pump 2 fuse No2 in F564 • Check the coolant pump wiring harness for chafing or other faults • Check coolant pump MGS connector M41 • Check that M41-A, M41-B and E81-B are connected. • Disconnect M41-B and measure the voltage on the cable between M41-B2 and M41-B3. If the voltage is <22V, perform a troubleshooting on the feeding cable to the pump M41 and the 24V-system. • Check that the coolant level is within the specified range. If not, refill and run the pump in deaeration mode. • Check that the coolant has an acceptable quality (colour, viscosity, clear appearance, free from sludge and sand). If the coolant quality appears to be poor, change the coolant according to PD2255172. • Change the Coolant Pump 2 (M41). • Change BMU(E81).
What you'll see
No driver-visible symptom recorded.
System reaction
• Amber warning lamp "Hybrid System Fault" is shown in ICL • No or reduced cooling of the MGS.
Diagnostic depth
• Coolant Pump 2 speed does not match with the requested speed
• Bad connection • Internal error • Pump impeller stuck