Hi,

Im planning on to take an Me7.5 ECU and desolder the processor and replace it with a shield to connect complete diffrent controller that i have. Is it some how possible to debug which pin on the ECU connector that goes to the corresponding I/O on the processor...  For example i want to know which output from the processor controls the injector #1 for example..  The idea is to use the ECU as mainboard as I/O..  Is this possible or is it to hard to do sort this out?
 

Good luck.

To give you an approximate idea of what you're looking at: http://nefariousmotorsports.com/forum/index.php?topic=67.0title=

Yes this was my first concern..  I had an idea to connect an LED to 12v and connect it to an injector pin. Then with a piece of wire connected to ground go by hand and ground the different pins on the processor to se if I get a hit. This is my understanding of how the processor it self works.  Would this be a method of sort of "mapping the pins" ?



Nyet i already have a board that has its own circuit to drive an CPU with its own code and is tunable via online interface. Now I want to try and se what this can do.

Injectors will not be driven off the CPU directly - they draw too much current.

How do you plan on grounding out that single injector signal?  IE: how do you stop other sensors/injectors also providing a ground source?

The controller would be an arduino based Speeduino.. This is how the speeduino I/O looks like.
Heres how its tuned aswell. https://www.youtube.com/watch?v=Q475JN-t63E.

I have tested this and made a DIY mainboard.. but it would be sick to use existing ECU board and harness.. Mainly to use with older engines as a very cheap alternative to standalone ECU,.

Pin #   Function
1   Injector 1 - Pin 1/2
2   Injector 2 - Pin 1/2
3   Injector 3 - Pin 1/2
4   Injector 3 - Pin 2/2
5   Injector 4 - Pin 1/2
6   Injector 4 - Pin 2/2
7   Ignition 1
8   Ignition 4
9   Ground
10   Ground
11   MAP Sensor (0v-5v)
12   Ground
13   5v
14   Fuel Pump Relay (Gnd)
15   Thermo Fan Relay (Gnd)
16   Low current output 3
17   Low current output 4
18   Low current output 5
19   Coolant (CLT)
20   Inlet Air Temp (IAT)
21   O2 Sensor
22   TPS input
23   Ground
24   Cam Input / VR2+
25   Crank Input / VR1+
26   VR2- (Not used for hall sensor)
27   VR1- (Not used for hall sensor)
28   5v
29   Idle Stepper 2B
30   Idle Stepper 2A
31   Idle Stepper 1A
32   Idle Stepper 1B
33   Ignition 3
34   Ignition 2
35   Boost
36   Idle 2 (For use with 3 wire idle valves)
37   PWM Idle
38   VVT
39   Injector 2 - Pin 2/2
40   Injector 1 - Pin 2/2

http://www.k-data.org/kdfi-pnp-vw-agu-18t.html

Or buy this And call it a day

Are you referring to a ground loop?
I think OP wants to replace the processor alone. So he can still use the injector driver(bosch ic 30344) There is a spec sheet of this chip posted on this forum, it communcates using its own serial interface, if I remember correctly.

@OP- why change the processor? If you're writing your own code on a different micro, why not use the c167 and write the code from scratch?

Yes some sort of ground loop.
Use the processor was also an idea but I don't have that deeper knowledge to write a complete new code..  I was thinking to use the already tested and well known Speeduino software as controller. It uses an ARM processor with the code already tested and can be used with TunerStudio. But not sure if it will work.

Yesterday i desoldered the CPU and made a test to see if I could managed to set an INJ out. But didn't manage to get any results. I think the issue was that i didn't have all the needed 12V and GND connected to the connector. This is needed to drive the output drivers (I think). Need a better wiring diagram.