Mini Cooper workshop manual page 108

text version of content this owner's manual page from owners manual to the vehicle Mini Cooper, year of production 1961 - 2000:

ENGINEMANAGEMENTSYSTEM-MEMS ENGINEMANAGEMENTSYSTEM IGNITIONSYSTEM TheEngineControlModule(ECM)monitorsthe conditions required for optimum combustion of fuelTheECMdeterminestheoptimumignitiontiming in the cylinder through sensors located at strategicbasedonthesignalsfromthefollowingsensors: points around the engine. As a result of these sensor inputs, the engine control module can adjust1. Crankshaft position sensor - Engine speed and the fuel quantity and timing of the fuel beingcrankshaft position delivered to the cylinders. 2. Manifold absolute pressure sensor - Engine load Themainfeaturesareasfollows: 3. Engine coolant temperature sensor - Engine temperature • AsingleECMcontrolsthefuelinjection system4. Throttle position sensor - Throttle pedal andtheignition system. The ECM incorporatesreleased short circuit protection and can store intermittent faults on certain inputs. TestBook can interrogateTheenginemanagementsystemusesnocentrifugal the ECMfor these stored faults. or vacuum advance. Timing is controlled by the ECMwhichisenergisedbythemainrelay,located • TheECMiselectronicallyimmobilisedwhichwithin the relay module. Spark distribution is prevents the engine from being started unless itachieved by a direct ignition system which consists receives a coded signal from the anti-theft controlof a twin-ignition coil driven directly from the ECM. unit. • Inconjunction with the throttle position sensor the ECMusesthespeed/densitymethodofair flow measurement to calculate fuel delivery. This methodmeasurestheinletair temperature and inlet manifold pressure and assumes that the engine is a calibrated vacuum pump, with its characteristics stored in the ECM, it can then determine the correct amount of fuel to be injected. • Thevehiclediagnostic connector allows engine tuning or fault diagnosis to be carried out using TestBook without disconnecting the ECM harness multiplug. • TheECMharnessmultiplugincorporates specially plated pins to minimise oxidation and give improved reliability. • TheECMcontrolstheoperationoftheradiator andair conditioning cooling fans, based on signals received from the engine coolant temperature sensor. • If certain system inputs fail, the ECM implements aback-upfacility to enable the system to continue functioning, although at a reduced level of performance. 2 DESCRIPTIONANDOPERATION REVISED:12/96

owners manual Mini Cooper