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BMW motor digital management system fault repair service assessment - 11/03/2013
Motor personal computer failure

A 525i BMW, with weak point plus a great deal of white smoke exhaust pipe , the dashboard "CHECKENGINE" malfunction indicator lights. Utilizing the BMW ICOM to go through the fault code 1215 , which means air circulation meter or perhaps a terrible line . Just after testing, the air stream resistance won't meet up with the necessities. Switch the airflow once the take a look at , the ailment enhanced a little bit , although the fault persists. Once more , it absolutely was found the primary four -cylinder spark plug coated with gasoline , indicating that the cylinder would not work. Inference injector challenge , exchange the nozzle following the exam , no fault code appears , however the condition continues to be. LED lights screening, located the first four -cylinder motor laptop or computer injector sign output line no sign ( good line ) , concluded that the laptop has unsuccessful. Switch the engine laptop or computer , troubleshooting.

Problems in setting up the engine

A 6 -cylinder BMW sedan, cold car hard to get started on . Look at the cold start command circuit , disconnect the cold commence injector and thermal timer switch on the plug, flip the ignition switch to your start off position , along with the pilot lights inside the injector wiring and switches STA head Verify the power source problem . The injector plug effectively, and utilize a wire to warmth timer change STJ direct overlap . The ignition change for the start place , the motor easy start out. Switch gentle relay , troubleshooting.

Engine black smoke

Instance: a BMW sedan, motor idle speed instability , black smoke and gas huge . Even if testing uncooked greasy compared to idling trembling , "CHECKENGINE" indicator lights. Read through fault codes two , that means the oxygen sensor "target = _blank> sensor circuit is bad or the air / fuel ratio is not proper in accordance towards the subsequent course of action for loading during the exhaust pipe muffler entrance oxygen sensor detected ( applying a superior -impedance digital Multimeter ) :

Street, start out the motor and achieved operating temperature

Lu ignition change to "OFF"

Disconnect the oxygen sensor connector highway "target = _blank> Connector

Street after which you can start out the engine outlet voltage measurement ( ie, oxygen sensor emf should really be 0.1V ~ 0.9V), simultaneous measurement of voltage plug ( ie ECU feet established voltage , ought to be 0.45V) measurements showed which the sensor signal voltage is 0V ( usual voltage should really be 0.1V ~ 0.9V), indicates the sensor is damaged, to ensure that the computer mistakenly been given "rare " combined air sign , causing the exhaust black smoke . Replaced with new sections , troubleshooting .

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