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Author Topic: Golf 4 1.8t AGU converted to ME7 - Main relay DTC  (Read 2554 times)
aef
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« Reply #15 on: September 08, 2020, 06:43:17 AM »

Why not power pin21 and 121? isnt this enough?
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sda2
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« Reply #16 on: September 08, 2020, 08:29:09 AM »

I did, or better, I use the correct harness, but I found out in a very handy Excel sheet (Vari_ME75X.xls) that the early ME7 versions prior to C2-1 never came with main relays.

So the corresponding RAM variables were 0.0V all the time. Maybe Bosch didn't equip the PCB with the components needed for main relay diagnosis.
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dal
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« Reply #17 on: September 08, 2020, 10:18:00 AM »

I did, or better, I use the correct harness, but I found out in a very handy Excel sheet (Vari_ME75X.xls) that the early ME7 versions prior to C2-1 never came with main relays.

So the corresponding RAM variables were 0.0V all the time. Maybe Bosch didn't equip the PCB with the components needed for main relay diagnosis.

Could you share this excel sheet please?
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sda2
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« Reply #18 on: September 08, 2020, 10:54:57 AM »

Sure Smiley
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aef
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« Reply #19 on: September 09, 2020, 01:13:26 AM »

I did, or better, I use the correct harness, but I found out in a very handy Excel sheet (Vari_ME75X.xls) that the early ME7 versions prior to C2-1 never came with main relays.

So the corresponding RAM variables were 0.0V all the time. Maybe Bosch didn't equip the PCB with the components needed for main relay diagnosis.

i dont get it, maybe because of my english skills.

you use ecu und corresponding harness from donor car and ran into which exact error?
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sda2
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« Reply #20 on: September 09, 2020, 04:21:48 AM »

I use an AGU engine, with ARZ donor components and harness with an ECU from a Passat APU engine.

The early versions of ME7 (hardware revision C1-2) came with Passats and didn't have a main relay for the ignition coil supply voltage.

That's why they don't have the analog-digital-converter pins hooked up.

If you flash a newer ME7 software, it will report those voltages as 0.0V and run into throttle body adaption errors.

To keep all diagnosis functions happy I changed the program code where the ADC is polled.

Instead of polling the ADC channels PXAN13 and PXAN14, I simply copied the ignition key voltage RAM variable to the mentioned other ones.

That solved every issue without messing with any of the main relay calibration values and allows anyone to run cheap 10-15€ ME7s with fully defined calibration space.


Passat software worked okay-ish, but since the turbo is slightly different in transversal engines I wanted to run a Golf calibration on it.
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