BMW X5 Owners & Service Manuals

BMW X5: Brief Description Of Components

The engine control system of the V8 engine is described for the E65.

With the digital engine electronics (DME) on the N62TU, the following sensors supply signals to the DME control unit:

> E70

Power supply from front power distributor in junction box

> E70

Power supply from front power distributor in junction box There is also an intake air temperature sensor in the hot-film air-mass sensor housing. The intake air temperature sensor is a resistance with negative temperature coefficient (NTC).

The intake-air temperature is input into a great many DME functions, e.g.:

  • Ignition timing calculation
  • Knock control adaptation
  • Idle speed control
  • VANOS actuation
  • Valvetronic actuation
  • Electric fan actuation

A fault in the intake air temperature sensor will cause an entry to be stored in the DME fault memory. A substitute value is then used for engine operation.

> E70

Power supply from front power distributor in junction box

The piezoelectric knock sensors record structure-borne sound in the individual cylinders. The DME control unit evaluates the converted voltage signals for each cylinder separately. The DME does this using a special evaluation circuit. Each knock sensor monitors 2 cylinders. Two knock sensors are packages as a single component.

> E70

Power supply direct from CAS.

The oil condition sensor sends the recorded measurement values to the DME.

A bit-serial interface is used to transmit the signal to the DME.

The integrated supply module supplies voltage to the oil condition sensor.

> E70

The oil pressure switch is directly connected to the DME control unit.

The signal from the oil pressure switch is checked for plausibility in the DME.

To do this, the signal from the oil pressure switch is observed after the engine has been switched off.

After a certain time, the oil pressure switch should not detect any more oil pressure. Is oil pressure is detected, the DME responds by recording a fault memory entry.

The following control units and other interfaces are involved in the digital engine electronics (DME):

The thermal monitoring of components in the DME control unit is carried out by the temperature sensor.

The ambient pressure is required to calculate the mixture composition. The ambient pressure reduces as the height above sea level increases.

The voltage sensor on the DME control unit board monitors the power supply using terminal 87.

The DME control unit is connected to the vehicle electrical system by 5 connectors.

The DME control unit is linked to the safety and gateway module (SGM) and to the rest of the bus system by means of the powertrain CAN.

> E60, E61, E63, E64 from 09/2005

The body gateway module (KGM) is the gateway between the PT-CAN and the rest of the bus system.

> E70

The junction box electronics (JBE) is the gateway between the PT-CAN and the rest of the bus system.

> E70

The Valvetronic control unit receives its power supply from the front power distributor in junction box.

The Valvetronic control unit continuously checks whether the actual position of the eccentric shaft corresponds with its nominal position. This makes it possible to detect any stiff movements in the mechanics. In the event of a fault, the valves are opened as wide as possible. The air supply is then controlled by the throttle valve.

> N62TU in the E70

The E70 does not have an integrated supply module.

> N62TU

The 8-cylinder spark-ignition engine has an integrated supply module. The integrated supply module includes various fuses and relays (not a control unit, just a distributor). The integrated supply module acts as the central interface between the vehicle wiring harness and the engine wiring harness.

The PT-CAN is also routed through the integrated supply module.

> E65, E66

The DME switches the starter motor on.

These interfaces are needed for the torque monitoring function.

The digital engine electronics (DME) activates the following actuators:

The DME control unit monitors the activation of the fuel pump relay. The fuel pump relay is controlled via a safety circuit only when the engine is running and shortly after terminal 15 ON for pressure build-up (delivery line for fuel pump).

> E70

The rear power distributor supplies power to the fuel evaporation control valve.

> E70

No integrated supply module; the relief relay is fitted separately.

> E70

The mapped thermostat receives its power supply from the front power distributor in junction box.

> E70

The E70 has no exhaust flap.

A diaphragm canister is fixed onto the right-hand rear silencer exhaust pipe. The diaphragm canister is linked to the exhaust flap via an adjustment mechanism.

The vacuum hose goes from the solenoid valve to the diaphragm can.

The exhaust flap reduces the noise level when the engine is idle and when the engine speed is close to idle.

The exhaust flap is closed at low engine speeds and when the engine is not running. At higher engine speeds, the exhaust flap opens.

The DME controls the solenoid valve for the exhaust flaps. The adjacent partial vacuum opens the exhaust flap. The degree of opening depends on engine load and engine speed.

> E65, E66

When the engine is switched off, the diaphragm can is ventilated via a restrictor. This allows the exhaust flap to execute a damped closing. The cutoff valve is actuated by the power module (PM).

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