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eliotroyano
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« on: December 22, 2015, 02:12:19 PM »
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Friends I have been trying to recover what I thought was a bricked ECU. ECU is 07K906032J 0261208858 ME7.1.1 of a MK5 Jetta 2.5L I5 car. I tryied to put into boot mode many times but always receive "Boot Mode Inactive" message. After what seems to be a healthy board I notice that some ICs doesn't have it needed +5V Vcc supply. For me ECU has a bad internal power supply.
Then my questions are:
1) anyone have some kind of circuit schematic of that board or of a similar ME7.5 one?
2) anyone knows which IC or board's zone converts +12V to +5V Vcc as power supply for whole board?
I have been tracing Vcc pads and routes but without luck until know.
Some help and advice will be nice.
Thanks,
Eliot
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k0mpresd
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« Reply #1 on: December 22, 2015, 03:58:57 PM »
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does this chip seem to get hotter than normal? i have replaced them before on dead ecus.
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DT
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« Reply #2 on: December 22, 2015, 05:13:19 PM »
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That 30343 chip is a CJ911 and does supply the main 5v.
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eliotroyano
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« Reply #3 on: December 22, 2015, 07:53:29 PM »
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Thanks a lot for the advice friends. Let me check and I come back to you.
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eliotroyano
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« Reply #4 on: December 23, 2015, 06:43:43 AM »
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Friends I check ECU board and it is cold like an Iceberg. I also check 30343 and it is cold too. I check voltage levels compared with other working ECU and it is not energized at all. Some protection diode or similar from +12V or ignition pin should be damaged. I need to know which ones are related. Continue tracing components.
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k0mpresd
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« Reply #5 on: December 23, 2015, 09:26:51 AM »
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i would still replace that chip first as a test.
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eliotroyano
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« Reply #6 on: December 23, 2015, 11:15:00 AM »
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Friends I found this two diodes, SG56 & EMB C522 in short. I have in a bad ME7.5 board a BYG 22D & LMP O1 working units, those will be compatible with that diodes?
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eliotroyano
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« Reply #7 on: December 23, 2015, 07:25:21 PM »
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Friends sorry to bother you with another question, do you know which IC is this one marked? It coding is 3043539 S867615.
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k0mpresd
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« Reply #8 on: December 23, 2015, 08:31:58 PM »
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no clue on that man. sorry, never replaced that one before.
i would assume most diodes in the same circuit are created equal though.
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eliotroyano
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« Reply #10 on: December 26, 2015, 08:21:03 AM »
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Friends here is a review. I found previous indicated diodes in short. Those was changed. BUK128 Mosfet was checked and it is OK. As a precaution and following k0mpresd recommendation I change Bosch 30343 IC. Now Bosch 30343 is receiving+12V Battery voltage but +5V is still zero or almost zero. Something is in short around there. Anyone knows which IC is the one indicated which code seems to be 3043539?
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DT
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« Reply #11 on: December 26, 2015, 09:17:28 AM »
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Friends here is a review. I found previous indicated diodes in short. Those was changed. BUK128 Mosfet was checked and it is OK. As a precaution and following k0mpresd recommendation I change Bosch 30343 IC. Now Bosch 30343 is receiving+12V Battery voltage but +5V is still zero or almost zero. Something is in short around there. Anyone knows which IC is the one indicated which code seems to be 3043539?
isolate +5v output from 30343 (desolder pin and lift) |
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eliotroyano
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« Reply #12 on: December 26, 2015, 11:07:22 AM »
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isolate +5v output from 30343 (desolder pin and lift)
I found two (2) ground connections of smal SOIC-8 component previous mentioned. Problem could be in that little IC. That is the reason of my doubt. |
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DT
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« Reply #13 on: December 26, 2015, 02:18:50 PM »
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I was a bit unclear. Isolate the pin and measure if voltage is 5v to see if internal protection in 30343 disables output if current is too high.
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eliotroyano
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« Reply #14 on: December 26, 2015, 07:11:40 PM »
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I was a bit unclear. Isolate the pin and measure if voltage is 5v to see if internal protection in 30343 disables output if current is too high.
Ok understood. Let me check and I comment results from tests. |
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