Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Functional description
The electrical turbocharger coolant pump works according to the principle of a centrifugal pump. The engine control directly activates the turbocharger coolant pump (not via local interconnect network bus like the coolant pump for the charge air cooler).
The following graphic shows an example of an electrical turbocharger coolant pump.
| Item | Explanation |
|---|---|
| 1 | Turbocharger coolant pump |
| 2 | Connection of the exhaust turbochargers |
| 3 | Connection to the engine cooling circuit |
| 4 | three-pin plug connection |
Activation of the electrical turbocharger coolant pump takes into account the following variables:
- Coolant temperature at engine outlet
- Engine oil temperature
- Injected fuel quantity
The injected fuel quantity is used to calculate the heat contribution to the engine. The function is similar to that of heat management in the 6-cylinder engines. The after-run of the turbocharger coolant pump can last up to 30 minutes. To improve the cooling effect, the electric fan is also switched on. The electric fan runs down for a maximum of 11 minutes.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.