BMW X5 Owners & Service Manuals

BMW X5: Air Management N52KP and N51

As far as the air management system on the N52KP and N51 engines is concerned, the previous intake manifold system on the N52 is carried over. Depending upon application, the engines will use the 3-stage DISA or the single stage (No DISA) intake manifold.

For more information on the DISA system refer to the previous training material in the training course "ST501 - New Engine Technology".

Engine Service Information
Fig. 33: Identifying Intake Manifold System

Throttle Valve

All variants of the new NG6 engines receive the new EGAS 08 throttle by Siemens/VDO. The new throttle uses a plastic throttle valve and magneto-resistive feedback to the ECM.

The previous system used a potentiometer, whereas the new throttle uses a "contactless" system featuring magneto-resistive technology which is familiar from the eccentric shaft sensor on Valvetronic systems.

Engine Service Information
Fig. 34: Identifying Throttle Valve

The magneto-resistive sensors are integrated into the housing cover. The sensors are also non-wearing.

For plausibility, the one sensor outputs the analog signal in the range from 0.3 to 4.6 V and the other sensor inverts it again from 4.6 to 0.3 V.

Consequently, the contact force is 10 times greater than that of a conventional plug connector.

NOTE: It is possible to twist the connector before plugging it in. This can cause damage to the harness and connector.


 Air Intake Ducting

With regard to the N54 engine, the air intake ducting plays a significant role due to the requirements of a turbocharged engine. In principle, the energy of the escaping exhaust gases is utilized t

 Exhaust Gas Turbocharging

The turbocharger is driven by the engine's exhaust gases, i.e. exhaust gases under pressure are routed by the turbocharger turbine and in this way delivers the motive force to the compressor, which

 Boost-Pressure Control

The boost pressure of the turbochargers is directly dependent on the flow of exhaust gas which reaches the turbocharger turbines. Both the velocity and the mass of the exhaust-gas flow are directly


 Automatic deactivation of the front passenger airbags

Principle The system reads if the front passenger seat is occupied by measuring the human body's resistance. Front, knee, and side airbag on the front passenger's side are activated or deactivated. General information Before transporting a child on the front passenger seat, refer to the safety info

 Tire pressure monitor

Principle The Tire Pressure Monitor monitors the tire pressure and issues a warning if the tire pressure has dropped. General information Sensors in the tire valves measure the tire inflation pressure and tire temperature. Using the tire settings in iDrive, the system can automatically compare the

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