Hellen 121 ME7 for VAG PnP ECU

Hardware inside and outside of the ECU
Tire guy
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Re: Hellen 121 ME7 for VAG PnP ECU

Post by Tire guy »

here's the related diagram. It lacks info which and whether the switches are momentary or toggle and my small brain does not comprehend how exactly it works, but maybe some brighter minds here have an idea..
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audi1.8CruiseCntrDiagram.jpg
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AndreyB
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Re: Hellen 121 ME7 for VAG PnP ECU

Post by AndreyB »

now it's way easier for me to use. I am sorry I've barked but those details like exact pin numbers are making my life way easier
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deaner
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Re: Hellen 121 ME7 for VAG PnP ECU

Post by deaner »

AndreyB wrote:
Thu Feb 04, 2021 7:05 pm
now it's way easier for me to use. I am sorry I've barked but those details like exact pin numbers are making my life way easier
It's all good. At first I was like, it's in thebsupplied pinout dude! Then reeled it in and reminded myself that you're doing the work and were appreciative of it. 🍻 Lemme know how I can help.
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Re: Hellen 121 ME7 for VAG PnP ECU

Post by deaner »

Anything new on these bad boys? I've just recently got a 1.8t running on a Proteus. Would love to tinker one of these when available! 🍻
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AndreyB
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Re: Hellen 121 ME7 for VAG PnP ECU

Post by AndreyB »

deaner wrote:
Mon Mar 08, 2021 4:09 pm
Anything new on these bad boys? I've just recently got a 1.8t running on a Proteus. Would love to tinker one of these when available! 🍻
We are probably at least a month away from ordering a batch of Hellen 121, at the moment troubleshooting Hellen72 which has a lot shared with this one.
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Re: Hellen 121 ME7 for VAG PnP ECU

Post by deaner »

Awesome! Great to hear and I look forward to it!
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AndreyB
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Re: Hellen 121 ME7 for VAG PnP ECU

Post by AndreyB »

I am super confused about wideband pinout, looking for help.

Looks like heater low side control is ECU pin 5. Looks like ECU pins 70 and 71 are doing something not sure what.

Looks like heater +12 power does not go to ECU but goes into harness towards one of the relays.

Looks like I am missing two more wires and confused about which ECU wires goes into what WBO pin?

https://github.com/rusefi/rusefi/wiki/WBO has our universal WBO info including

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deaner
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Re: Hellen 121 ME7 for VAG PnP ECU

Post by deaner »

Does this help?
1 - green - ecu pin 70
2 - black - ecu pin 71
3 - blue/red - fuel relay power
4 - white - ecu pin 5
5 - grey/white - ecu pin 51
6 - grey/red - ecu pin 52
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LSU42toME75Connections_zpsf89f4226.png
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AndreyB
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Re: Hellen 121 ME7 for VAG PnP ECU

Post by AndreyB »

That's a great image!

Hold on, is it 4.2? All of these 121 pins are 4.2 or some are 4.9?
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deaner
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Re: Hellen 121 ME7 for VAG PnP ECU

Post by deaner »

AndreyB wrote:
Mon Mar 08, 2021 11:35 pm
That's a great image!

Hold on, is it 4.2? All of these 121 pins are 4.2 or some are 4.9?
They can vary. Me7.5 is 4.2 while me7.1 is 4.9. All me7.5 1.8ts are 4.2, while the 3.2 VR6 is 4.9, though both sharing the same 121 pin connector. Pretty sure the pinouts are the same though. I'll check the ecu pinouts between me7.5 and me7.1 when I get home later. I'm only familiar with the 3.2 vr6 and 1.8ts, so I dont know about other engines that use 121p connectors.
mck1117
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Re: Hellen 121 ME7 for VAG PnP ECU

Post by mck1117 »

deaner wrote:
Tue Mar 09, 2021 12:16 am
They can vary. Me7.5 is 4.2 while me7.1 is 4.9. All me7.5 1.8ts are 4.2, while the 3.2 VR6 is 4.9, though both sharing the same 121 pin connector. Pretty sure the pinouts are the same though. I'll check the ecu pinouts between me7.5 and me7.1 when I get home later. I'm only familiar with the 3.2 vr6 and 1.8ts, so I dont know about other engines that use 121p connectors.
The pinout almost HAS to be the same - the ECU is probably a Bosch CJ125 wideband interface chip inside, which supports both sensors with (afair) a single resistor change.
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Re: Hellen 121 ME7 for VAG PnP ECU

Post by deaner »

mck1117 wrote:
Tue Mar 09, 2021 1:39 am

The pinout almost HAS to be the same - the ECU is probably a Bosch CJ125 wideband interface chip inside, which supports both sensors with (afair) a single resistor change.
I generally try not to assume anything lol. Checked the pinout for my other pnp standalone ecu that works with both my 1.8t and my 3.2(bank 1), WBO2 ECU pinout is the same.
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Re: Hellen 121 ME7 for VAG PnP ECU

Post by MHTSOS »

I had once repaired an ECU from a 1.8t with an LSU 4.2 and it used CJ110 ic that is the same thing as CJ125 but only supports LSU4.2. So it seems they don't all use CJ125 for both types of sensors.

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mck1117
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Re: Hellen 121 ME7 for VAG PnP ECU

Post by mck1117 »

MHTSOS wrote:
Wed Mar 10, 2021 3:27 pm
I had once repaired an ECU from a 1.8t with an LSU 4.2 and it used CJ110 ic that is the same thing as CJ125 but only supports LSU4.2. So it seems they don't all use CJ125 for both types of sensors.

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Ah right - forgot about the CJ110. But either way, it's probably the same pinout on the ECU.
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Re: Hellen 121 ME7 for VAG PnP ECU

Post by nyl »

Hey,
thanks AndreyB for pointing this thread out

I will be running RusEFI on a golf mk2 with 1.8T engine swap 1.8T AUQ, and I also building a skoda octavia with 1.8t ARX but with Ignitron ECU ME 7.5 Plugnplay (both engine share same pinout from what i see)

You can find all pinouts based on ENGINE codes inside Ignitron setup wizard

AUQ/ARX Inputs:
image.png
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AUQ/ARX Outputs:
image.png
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===================================================================================================================
Also there is BAM engine code that has EGT sensor on PIN 61

BAM Inputs:
image.png
image.png (35.12 KiB) Viewed 39 times
BAM Outputs:
image.png
image.png (30.73 KiB) Viewed 39 times
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