M84 Integration with Porsche 993 ABS Module

Discussion and support for MoTeC's new entry level ECUs

M84 Integration with Porsche 993 ABS Module

Postby Kowalski on Thu Apr 02, 2020 9:11 am

Hello,

I am finishing up a 1995 Porsche 993 track car with an M84 ECU, two PDM15s, Central Informer to run the gauges and the OEM Bosch ABS controller with ABD. Almost everything is wired, online and working except I do not have a TVS signal to send to the ABS module. I am wondering if someone is familiar with the OEM Porsche setup and could share with me if the TVS is straight analog voltage or a PWM signal? I have seen TVS referenced as a PWM signal but cannot find any specs for it. Also, if TVS is a PWM signal, can the M84 be programmed to output this?

It is the Throttle Valve Info Signal from Pin 52 on the Motronics DME to Pin 47 on the Bosch ABS ECU. I do not have access to a factory setup to test.

Thank you for any and all help!
Kowalski
 
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Re: M84 Integration with Porsche 993 ABS Module

Postby Kowalski on Fri Apr 03, 2020 1:23 pm

I figured this out, thank you all for reading my post. In case someone is curious, it is a PWM signal.

As measured on the bench with a 1995 993 Porsche DME ECU:

TPS TVS Values.JPG
TPS TVS Values.JPG (18.09 KiB) Viewed 1265 times

Values were measured at tip in and tip out before a code sets.
Kowalski
 
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Re: M84 Integration with Porsche 993 ABS Module

Postby rsscotty on Sat Apr 04, 2020 5:14 am

So how did you configure the ECU to mimic this signal.
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Re: M84 Integration with Porsche 993 ABS Module

Postby Kowalski on Sun Apr 05, 2020 6:56 am

I did not have any available Auxiliary Outputs in the M84 (all 8 are used and it may not even be able to do it correctly) so I put together a 0 to 10 VDC driver circuit controlled by an Arduino with a little code. The M84 TPS signal voltage provides the input to the Arduino.
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Re: M84 Integration with Porsche 993 ABS Module

Postby sardengineering on Fri Apr 24, 2020 1:52 am

Thanks very much for sharing your solution and your findings on this project, I'm sure it'll be of great value to the members here.

Cheers!
---
Damien King
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