12 Questions
What should be done if the yellow warning lamp indicates high battery temperature?
Stop the vehicle immediately and contact emergency services.
What does a malfunction of M77 cause?
Power electronics cooling failure
Why is careful marking of the expansion tank with glue recommended?
To prevent arbitrary coolant refills.
What is the normal coolant temperature range mentioned in the text?
40-50°C
At what temperature does the DCDC converter reduce output current to 0%?
+90°C
How should the coolant mix be prepared for freeze protection and corrosion prevention?
50/50 mix
Was kann passieren, wenn der Kühlmittelniveausensor kaputt ist?
Die Batterie wird überhitzen.
Welche Auswirkung kann ein Fehler in Komponente M77 haben?
Es kann zu Leistungsabfällen kommen.
Was geschieht, wenn das System STP3 aktiviert wird?
Das Kühlsystem wird entlüftet.
Warum gibt es Ölkühler für den P6 und P160?
Um die Kühler zusätzlich abzukühlen.
Was passiert, wenn M86 gestört ist?
Kabine und Batterieheizung funktionieren nicht mehr.
Wie viele Temperatursensoren überwachen die Temperatur in einem Batteriepack?
80
Study Notes
- Yellow warning lamp indicates high battery temperature, requiring immediate vehicle stop, shutdown, key removal, and contact with emergency services and scanning workshop.
- Pump malfunctions (e.g. M82, M83, M84) can lead to battery overheating and limited power output, while M76 malfunction results in no battery cooling and reduced drive battery power due to energy being diverted for heating.
- M77 malfunction causes power electronics cooling failure, reducing torque output to zero, rendering the vehicle inoperable. M86 malfunction disables cabin and battery heating, triggering a yellow warning to prevent unnecessary coolant refills.
- Careful marking of expansion tank with glue is advised to prevent arbitrary coolant refills, as coolant loss due to leaks can potentially submerge batteries and modules.
- Components have specific temperature ranges: electric compressor operates between -40°C and +65°C, inverter functions between -40°C and +70°C, with torque reduction beyond 60°C.
- Normal coolant temperature range is 40-50°C, vehicles hold around 100 liters of coolant with a recommended 50/50 mix for freeze protection and corrosion prevention.
- DCDC converter target temperature is 20-60°C, reducing output current to 0% above 90°C, while heating targets 50°C and cooling targets 30°C for optimal operation.
- Battery pack comprises 10 modules with 8 temperature sensors each, totaling over 80 sensors for precise temperature regulation and monitoring via flexible printed circuits and CMC control unit.
Test your knowledge on electric vehicle battery cooling system malfunctions and the corresponding warnings and actions to be taken. Learn about specific components, temperature ranges, coolant recommendations, and sensor configurations.
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