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1、MINI ServiceAftersales Training - Product Information. N12/N14 Engine Electrical Systems.The information contained in the Product Information forms together with the Workbook an integral part of the training literature of Aftersales Training.Refer to the latest relevant MINI Service information for
2、any changes/supplements to the technical data.Information status: July 2006Contact: conceptinfobmw.de 2006 BMW AG Mnchen, Germany Reprints of this publication or its parts require the written approval of BMW AG, Mnchen. VS-12 Aftersales TrainingProduct Information. N12/N14 Engine Electrical Systems.
3、Ultramodern electronicsOptimized control proceduresNotes on this Product InformationSymbols usedThe following symbols are used in this Product Information to facilitate better comprehension and to draw attention to important information.3contains information to facilitate better understanding of the
4、 described systems and their function.1 identifies the end of a note.Information status and national variantsMINI vehicles conform to the highest safety and quality standards. Changes in terms of environmental protection, customer benefits and design render necessary continuous development of system
5、s and components. Such developments can result in differences between this Product Information and the vehicles used for demonstration purposes in the training course.This document relates exclusively to left-hand drive vehicles with Europe specifications. In vehicles with right-hand drive, the arra
6、ngement of some controls or components may differ from the illustrations in this Product Information. There may also be other differences due to variations in equipment between individual countries or markets.Additional sources of informationFurther information on the individual subjects can be foun
7、d in the following:- Owners Handbook- MINI Diagnostic system- Workshop systems documentation- MINI Service - TechnicalContents. N12/N14 Engine Electrical Systems.Introduction1 Ultramodern electronics1System overview3 System network link3Functions17 MEV17.2 and MED17.217System components29 Sensors an
8、d actuators29Service information81 Functions and system components81Summary83 Points to remember83Test questions85 Questions85 Answers to questions8613Introduction. N12/N14 Engine Electrical Systems.Ultramodern electronicsEngine control unitThe modern engine control units MEV17.2 and MED17.2 are ide
9、ally equipped for use in thenewMINI.ThankstotheuseofBMWlayer technology, functions that the control unit manufacturer has developed for all manufacturers can be replaced by the innovative and specific functions of the BMW Group.These innovations include: Alternator control Power management Oil chang
10、e interval indicationTasks of the control unit: Activation of spark plugs Activation of fuel injectors Measurement of operating variables Infinitely variable valve lift control (N12) Control of intake valve (N12/N14) and exhaust valve (N12) timing Boost pressure control (N14) Engine temperature regu
11、lation Knock control Oxygen (lambda) control Monitoringofcriticalinputandoutputsignal statuses and switchover to substitute measures (calculation of substitute values, emergency running options) Diagnosis of defective components Cruise controlImprovements of the MEV(D)17.2 compared to the MEV9.2:The
12、 engine management MEV(D)17.2 is a further development of the MEV9.2. Existing functions have been further developed and improved by the use of the latest processors. 1 knock sensor with improved evaluation Interface with EWS4 OBDonCAN(USlegalrequirementasfrom model year 2007) More powerful ignition
13、 output stages Throttle valve with contactless sensor Improved diagnostic capabilities of control sensor LSU4.9 Improved fuel tank leakage diagnosisThe ignition and fuel injection form the core of the engine control system. Governed by legal requirements and customer demands, more and more control a
14、ndregulationsfunctionshavebeen added. Today, a modern engine control or management system is responsible for a substantially greater range of functions.1 - MEV17.2 control unit2 - MED17.2 control unit23Sensors and actuatorsSensors: DME control unit (digital motor electronics) Ambient pressure sensor
15、 Temperature sensor Crankshaft sensor Camshaft sensor Intake Exhaust (only N12) Hot-film air mass meter HFM (only US) Intake manifold pressure sensor (only N14) Intake temperature and pressure sensor (only N14) Intaketemperatureanddifferentialpressure sensor (only N12) Coolant temperature sensor Kno
16、ck sensor Throttle valve Accelerator pedal module Eccentric shaft sensor (only N12) Oxygen sensor Control sensor with rising characteristic Monitor sensor with erratic characteristic Intelligent battery sensor IBS (depending on options) Brake light switch Clutch switch Oil pressure switch Pressure sensor for air conditioning system (only for optional air conditioning system) Car access system control unit, CAS Rail pressure sensor (only N14)Ac
