MSefi.com read only forum (Jan.15,2018)

I am using a conventional TPS sensor with my Megasquirt setup but am now fitting a ZF4HP22EH auto transmission. It is from a BMW 535 and uses an electronic controller to control the shifts. It also requires an input from the TPS.
Question is can I just use the one TPS and let Megasquirt provide the ref voltage and just daisychain the TPS sig back from the Megasquirt to the tranny controller or will I have to use a separate TPS for each controller.
Anyone faced this issue?
-Thanks in advance for any help Alan

Alan,

Yes, as long as the tranny ecu is high impedance (doesn't draw much current) you can share the TPS signal. The tranny ecu is very likely high impedance (most controllers are set up this way).

Where people get into trouble is trying to share things like coolant sensors, because those use the resistance in the sensor to form a voltage divider, and this doesn't work so well if you have two voltage sources.

Lance.

Thanks Lance, I'll give it a try. Unlike to cause any damage to either then? - Alan