L322 Range Rover System Description and Operation
ENGINE MANAGEMENT SYSTEM – V8
18-2-10 DESCRIPTION AND OPERATION
Bosch ME 7.2 Engine Management
System
Introduction
The V8 engine used in New Range Rover is controlled by the Bosch ME 7.2 engine management system (EMS). This
system is similar to the Bosch 5.2.1 system used in previous Land Rover V8 engines. The main difference between
the two systems is the “drive by wire” capabilities of the Me 7.2 EMS.
Another main difference between the 5.2.1 system and the ME 7.2 system is that ME 7.2 uses the Keyword protocol
2000* (KWP2000*) which is a ISO 9141 K Line compatible version of the Key Word 2000 protocol.
General
The key functions of the Bosch ME 7.2 engine management system are:
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To control the amount of fuel supplied to each cylinder
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To calculate and control the exact point of fuel injection
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To calculate and control the exact point of ignition in each cylinder
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To optimise adjustment of the injection timing and ignition timing to deliver the maximum engine performance
throughout all engine speed and load conditions
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To calculate and maintain the desired air/fuel ratio, to ensure the 3 way catalysts operate at their maximum
efficiency
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To maintain full idle speed control of the engine
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To ensure the vehicle adheres to the emission standards (set at the time of homologation)
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To ensure the vehicle meets with the fault handling requirements, as detailed in the European On-Board
Diagnostic (EOBD) III legislation
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To provide an interface with other electrical systems on the vehicle
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To facilitate the drive by wire functions
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To control the Variable Camshaft Control (VCC).
To deliver these key functions, the Bosch ME 7.2 Engine Control Module (ECM) relies upon a number of inputs and
controls a number of outputs. As with all electronic control units, the ECM needs information regarding the current
operating conditions of the engine and other related systems before it can make calculations, which determine the
appropriate outputs. A Controller Area Network (CAN) bus is used to exchange information between the ECM and the
Electronic Automatic Transmission (EAT) ECU
ECM
ECM
The ECM is located in the Environmental (E) box, in the front right corner of the engine compartment. The E-box
provides a protective environment for the ECM and is cooled by an electric fan. The main relay for the ECM is also
located in the E-box.
