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The BMW Range
3 Series
E36
E36 M43 - what went wrong?
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<blockquote data-quote="jarance" data-source="post: 353006" data-attributes="member: 21"><p>R220 and R227 are resistor in parallel configuration. I presume they are connected in parallel due to the power consumption. </p><p></p><p>from pin P5.5 (come from the CPU) , it drive a darlinton configuration. i.e. a signal to drive a switching transistor which in turn drive a power resistor to switch on the MAIN RELAY CONTROL.</p><p></p><p>check the transistor T220, T221 and T222 and zener diode D220. I suspect that T220 might be burnt or overload due to the fact the resistor is burnt because it take a high current to burnt the resistor. Problem is what value to replace the resistor if you cannot see the colour coding.</p><p></p><p>I suspect that you could have fried the ECU during your testing of the sparks when you might have accidentally jumper the wrong terminals. Please take note that most of the sensors like oxygen, air temperature (AFM) and etec are also connected to the ECU.</p><p></p><p>see pic below..</p><p><img src="http://i122.photobucket.com/albums/o271/pbjy/AFM/mainrelay.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="jarance, post: 353006, member: 21"] R220 and R227 are resistor in parallel configuration. I presume they are connected in parallel due to the power consumption. from pin P5.5 (come from the CPU) , it drive a darlinton configuration. i.e. a signal to drive a switching transistor which in turn drive a power resistor to switch on the MAIN RELAY CONTROL. check the transistor T220, T221 and T222 and zener diode D220. I suspect that T220 might be burnt or overload due to the fact the resistor is burnt because it take a high current to burnt the resistor. Problem is what value to replace the resistor if you cannot see the colour coding. I suspect that you could have fried the ECU during your testing of the sparks when you might have accidentally jumper the wrong terminals. Please take note that most of the sensors like oxygen, air temperature (AFM) and etec are also connected to the ECU. see pic below.. [IMG]http://i122.photobucket.com/albums/o271/pbjy/AFM/mainrelay.jpg[/IMG] [/QUOTE]
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E36 M43 - what went wrong?
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