BMW X5 Owners & Service Manuals

BMW X5: Turbocharger Diagnosis

There are three "Golden Rules" to adhere to when diagnosing concerns on the N54 engine:

1. When diagnosing cases of smoke from the exhaust, it is important to avoid unnecessary replacement of the turbochargers. Smoke can be caused by oil consumption such as the crankcase ventilation system.

Always evaluate the crankcase venting system completely before condemning any turbocharger components. Also, any engine is also subject to the usual causes such as valve guide wear or piston ring issues as on non-turbocharged engines.

2. Turbocharger damage is usually caused by -

3. Do not make any alterations or modifications to the turbocharger. Do not make any adjustments to the boost control linkage or any part of the turbocharger. Higher than normal boost pressure may have adverse and detrimental effects on the engine. Any modification will cause the engine management to enter in the "limp-home" program and will reduce performance and engine reliability.

Engine Service Information
Fig. 44: Identifying Modifications To Turbochargers

NOTE: No Modifications to the turbochargers are permitted.

Engine Service Information

Measure and record the following values for the listed components under the indicated operating:

Engine Service Information
Fig. 45: Identifying Diagnosis Function Table

Hot-Film Air Mass Meter

Some new NG6 engines use a digital HFM. The output of the sensor is converted to a digital signal. This eliminates the need for signal conversion in the ECM. The signal corresponds proportionally to changes in air mass. The N54 engine uses a virtual HFM. The signal is "calculated" in the ECM from various parameters such as engine speed, intake air temperature, throttle position etc.

Engine Service Information
Fig. 46: Identifying Hot-Film Air Mass Meter Diagram (1 Of 2)

Engine Service Information
Fig. 47: Identifying Hot-Film Air Mass Meter Diagram (2 Of 2)

Engine Service Information
Fig. 48: Identifying BMW Measuring Oscilloscope Display Screen

Engine Service Information
Fig. 49: Identifying Oscilloscope Settings Table


 Fuel Supply And Management

 N52KP And N51 Fuel System

The N52KP and N51 engine continue to use the conventional "manifold injection" system carried over from the N52. The fuel supply components are also carried over with regard to the EKP module, fuel

 HPI Function

The fuel is delivered from the fuel tank by the electric fuel pump via the feed line (5) at an "feed" pressure of 5 bar to the high pressure pump. The feed pressure is monitored by the low-pressure


 Display on the Control Display - With Parking Assistant Plus: Surround View

Display on the Control Display Overview Toolbar, left Camera image Side view Automatic camera perspective Movable unobstructed camera perspective Toolbar, right Rearview camera Selection window Toolbar on the left The left toolbar can be used for the direct selection of various views via

 Cross Member

Minimum set: Mechanical tools Note: To hold the engine when removing and installing the front axle support, the oil sump and the transmission Engine: M10, M20, M20B25, M20B27, M21, M30, M30B34, M30Tur, M40, M41, M42, M43, M43TU, M44, M47, M47T2, M47TU, M50, M51, M52, M52TU, M54, M56, M57, M57D25,

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