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Thread: C5 Accelerator Pedal Position Sensor

  1. #1

    Default C5 Accelerator Pedal Position Sensor

    Can I use this at the 'throttle position' indicator by hooking up a single wire from one of the three 'APP signal' wires into one of the 'signal' ports on my USM? Any other wires required (ie does the USM require a 12v power and ground for each port)? Programming/calibration instructions? (I can't seem to find any).........am really starting to feel like an idiot (grin).

    The only thing I have managed to do is get the USM Channel renamed to Throttle Pos.....LOL.

    Using the new version Datalink. G2X Black box.

    Thanks for any help.

  2. #2

    Default Re: C5 Accelerator Pedal Position Sensor

    Well.......figured out I don't need ground or power......thats only if the sensor needs it from the USM.

    I'm getting .556v at closed throttle and approx 2.5v on my signal wire at WOT. Do I just plug those numbers into the config screen and call it good?

    BTW.........HI TIM from Steve and Natha!!!

  3. #3

    Default Re: C5 Accelerator Pedal Position Sensor

    Tim? Cam?

    Am going to run it as is at COTA in two weeks......will see if I get any usable data.

  4. #4

    Default Re: C5 Accelerator Pedal Position Sensor

    Quote Originally Posted by sccacp16
    Well.......figured out I don't need ground or power......thats only if the sensor needs it from the USM.

    I'm getting .556v at closed throttle and approx 2.5v on my signal wire at WOT. Do I just plug those numbers into the config screen and call it good?

    BTW.........HI TIM from Steve and Natha!!!

    As long as the voltage is linear it should work. Just calibrate it like that in Datalink. I don't have Datalink in front of me but it's like no throttle - read voltage, Set A = 0. Push throttle all the way, read voltage, Set B = 100. As in 0-100%. You can open a telemetry session and stab the throttle couple times and check your readings live in Datalink to make sure it's working.

    Now I have had an issue with tapping into an existing TPS wire on my car and ended up running a separate throttle sensor before. It would change the voltage the PCM saw on the TPS line but that was with an older Haltech PCM and it was just a regular TPS sensor not a drive by wire system. So you might want to double check that the stock PCM is still happy with you tapping into the wire. Drive by wire uses redundant sensors so you'll probably be fine?

  5. #5

    Default Re: C5 Accelerator Pedal Position Sensor

    Quote Originally Posted by jackhs
    Just calibrate it like that in Datalink. I don't have Datalink in front of me but it's like no throttle - read voltage, Set A = 0. Push throttle all the way, read voltage, Set B = 100. As in 0-100%. You can open a telemetry session and stab the throttle couple times and check your readings live in Datalink to make sure it's working.
    I'd recommend doing this as well. Turn on the ignition and with the data system hooked up to your laptop. Go into that channel's input parameter's tab and hit the calibrate button. Like Jack said, with the throttle in the idle position, push the Set A button. The scaled value should be zero (zero percent throttle in future plots). For my C5, the raw value at 0% throttle was 0.5893 Volts, pretty close to yours. Exact values aren't all that important in my opinion.

    Then push down all the way on the accelerator and hit the set B button. I would change the scaled value to be 100, ie, 100%. On mine this was around 2.6 Volts. The throttle stop on my C5 is a little spongy. Pressing harder will make the data go over 100%. Again, in my opinion, it doesn't matter if the data shows 102% throttle. Then be sure to save the config file and upload to your data system.

    You can test it all by starting a telemetry session. You have to first make sure the channel is available for telemetry sessions by right clicking on the G2X module and moving all the channels to the real time session. Again, save the config file and upload it. In a telemetry session, you can monitor the throttle in real time and push on the accelerator with ignition on and see the data trace move.

    I didn't have any issues with the data system changing the sensors output. However, with all the splicing I have done into the car's stock sensors, I need to make sure the data system is turned on before I start the car. Otherwise, the car sets codes and has issues. Also, I have to shut the car off before turning off the data system for the same reason. This makes the data system first on and last off. No big deal for me.....

  6. #6

    Default Re: C5 Accelerator Pedal Position Sensor

    Yeah.........had it all wired up and when she went out for her first practice lap at COTA a few weeks ago, the car fell right on its face and barely made it around the track. Limp mode, reduced power etc.........pulled her into the pit and cut the wire. Car ran fine........

    Will be looking for a different way to get throttle position data..........

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