Breakdown phenomenon: One runs quickly S600, chassis date WDD221176, assemble engine of pressure boost of 275 pairs of turbine, 125300km of travel course of development. The client mirrors engine trouble lamp to shine, idle fast shake, urgent quicken faint.
Breakdown diagnoses: There is a car after receiving a car, lamp of trouble of the engine on appearance often shines, idle fast when slight shake. Join diagnostic appearance has rapid test, if the graph is shown 1 times,read the malfunction code in taking engine to control module ME.
Graph 1 malfunction code
This engine and pattern of general engine light a fire differ somewhat, because be opposite ignition energy requirement is very strict, so alone ignition controls module to undertake controlling. Make simple introduction to its composition and function above all: Ignition system ECI must produce scintilla to cause inflammation through sparkplug, this need is enough high maximum pressure produces scintilla in sparkplug extreme, and sparkplug must have enough energy to ignite oil gas mixture in order to ensure, ignition system must is opposite sparkplug carbon deposit is not sensitive, assure the service life with longer sparkplug. Ignition system ECI includes: Cylinder group ignites on the right side of module ECI; ECI of module of ignition of left cylinder group; Device of power source of ECI ignition system; ME accuses those who make electricity of the ion in module to measure circuit; ME control module is right the drive of ignition system ECI; ME controls the ignition a collection of illustrative plates in module. Attention: Ignition system ECI cannot undertake scintilla checks.
Ignition system ECI has the following child function: (1) generation ignition voltage (alternating voltage) . Every sparkplug of ignition module has an output class, ignition coil is decorated in sparkplug connect, the output step that takes concussion circuit produces ignition tension by the input voltage that makes an appointment with 180V. ME controls module to produce pulse of the following drive: Ignite according to igniting angle sparks scintilla; Control ignition process continuously; Change ignition; Ignite deflection is measured. (2) measure ionic electric current. The switch that end of ignition scintilla phase measures to ionic electric current from time to tome, undertake metrical below the help of the auxiliary voltage that the ionic electric current on sparkplug is making an appointment with 23V, ionic electric current is controlled in ME undertake assessment in module, these signal are used at detecting ignition of the flaming below circumstance of high rotate speed is undesirable. (3) what generation of power source device needs double mix at 180V the double voltage at 23V.
The abiding control of ignition process: The scintilla energy of duration of will whole scintilla adjusts the ignition energy that requires actually to oil gas mixture, control module to be controlled according to performance plan by ME. Scintilla duration control can prolong the average service life of sparkplug 4 times, in the meantime, the sparkplug that cooperates to use the electrode that take platinum can prolong service life further. Ignite deflection quantity and ignition change: Be in most about inside the inferior bear limits of 2000r/min, two sparkplug of cylinder spark at the same time, in medium fall with tall engine bear, ignition scintilla sparks deflection is the biggest the crankshaft corner of 10 ° , to make two sparkplug on cylinder wear away rate is same prevent carbon deposit of firebox a side, corner of 720 ° crankshaft changes the drive order every other of sparkplug.
Ionic electric current measures: Ion arises before blaze in combustion process (the particle that has different n) , counteract each other again in oil gas mixture, can bring to bear on in sparkplug extreme lesser measurement voltage, will in order to connect ham blaze measure ionic electric current. Measure voltage to encircle side in primary ignition line (the auxiliary voltage that makes an appointment with 23V) , this produces the alternating voltage that makes an appointment with 65Hz and 1kV on the sparkplug electrode of secondary coil side, ionic electric current adjusts this voltage. Classics depart and filter wave are attainable signal of ionic electric current, the cylinder pressure information that signal of ionic electric current gives out has certain precision, this information is used at detecting to burn ignition is undesirable, signal sends the ionic electric current of every 3 cylinder to control module to ME, below the help that measures the window, the relevant cylinder of all sorts of circumstances undertakes allocation in ME control module.
Can seeing in malfunction code engine trouble light is bright is caused, enter the tally that lack fire to be worth actually (like the graph 2 are shown) , the discovery after starting lacks fire 4 crocks all the time, do not work basically, but did not appear a certain cylinder is shut, because only a crock lacks fire, time of eject of the angle of solar term door of engine, fuel was not affected (if pursue,3 are shown) .
Graph 2 tally are worth actually
Graph 3 idle fast when examine value
Act on then by brief to numerous principle, detect above all component N91 (the power supply device of ECI portfire) 87 terminal power supply (circuit is shown 4 times like the graph) , detect the requirement in the process shuts ignition switch, unplug the outlet on N91, open ignition switch next, measure 4 sutural with 14 sutural (the power supply of coil of ignition of left cylinder row and take iron) , 5 sutural with 11 sutural (on the right side of the power supply of coil of cylinder row ignition and take iron) all control in 12.2V, normal.
Graph 4 sparkplug dominate circuit
Detect then the auxiliary voltage that ion shedding measures, the requirement when detecting shuts ignition switch, unplug again next N92/1 (on the right side of module of ignition of cylinder row ECI) the outlet that go up, measure 8 sutural with 14 sutural voltage, measure actually for 22.68V, mark fiducial value is 21 ～ 25.0V, normal.
Detect then primary power supply, shut ignition switch, await 3min at least, unplug the outlet on N92/1, measure actually for 177.6V, standard limits is 175 ～ 190V, normal also. Consult the maintenance history of this car, discover this car has changed before 10000km sparkplug, had cleaned solar term door and oily steam region, but be being judged according to measuring an outcome is sub ignition unusual.
Pull down then two 4 crocks sparkplug, did not discover unusual appearance, the carbon deposit on sparkplug is very few, also do not have phenomenon of adj/LIT wide crock. Exchange with other crock after sparkplug, still be 4 crocks lack fire, explain trouble spot does not depend on sparkplug. As a result of metrical circuitry normal, can deciding basically is on the right side of ignition coil attaint, on the right side of ignition coil changes, again test-drive everything is normal, trouble removal.
