TEMS to ECU signals - help needed

[rfurgy]

I'm looking for details about the three wires (L1, L2, L3) that run from the ECU to the TEMS computer. I know which three they are so I don't need to know that.

Rather, what I need is what those three wires do specifically. What kind of signals, what for, and which direction.

I'm attempting to keep my TEMS setup with an aftermarket ECU.

 

[rfurgy]

I take it no one knows.

Seems to be a 5v signal. Would just like verification from a working system that the 5v is on/off and what % of the gas pedal it changes.

 

[Raven97990]

They are outputs from the ecu for throttle position if memory serves me correctly, and I'm not sure it'd be worth dedicating 3 outputs of a standalone for it.

Sent from my X10i using Tapatalk

 

[jetjock]

...I take it no one knows...

Simply because nobody replies doesn't mean nobody knows. I also agree dedicating three digital inputs on a standalone (assuming it has them) for this purpose is more trouble than it's worth.

 

[rfurgy]

According to the trouble shooting section in the repair manual it shows the signal should move between 5v and 0. This is kind of looking like a simple on/off switching 5v reference but I'm just trying to verify that and at what % of the pedal it changes.

Outputs from my ECU is not a problem. I could run a V12 with semi-sequential injection if I wanted to.

The point of it would be the keep the suspension control especially during hard launches which I'm sure the TEMS is using the TPS signal for. I could then control when those signals are switched there by giving me a tunable delay for traction purposes.

Thank you guys for taking a look.

 

[MA61 XX GT]

It's a 3 bit digital representation of throttle position, it tells the TEMS/Auto computer of throttle position. (The tems uses this to stiffen the shocks when you plant it)

In the factory ecu it's an open collector output that pulls to ground (with a 5V pullup)

TPS L1 L2 L3
0.5V 5V 5V 5V
0.85 5V 5V 0V
1.1V 5V 0V 0V
1.45V 5V 0V 5V
1.78V 0V 0V 5V
2.3V 0V 0V 0V
2.8V 0V 5V 0V
3.88V 0V 5V 5V

I used a PICAXE to generate these from the tps signal.

(Refer http://www.autoshop101.com/forms/AT10.pdf page 10 for throttle position in percentage)

 

[rfurgy]

That is so ridiculously AWESOME! Exactly what I've been searching for and couldn't find. This will prove to be extremely useful.

Thank you MA61 XX GT