After having my emanage ultimate and harness installed, for some reason I'm getting cel codes: p122 and p1121 which both have to do with the TPS and voltage. Sometimes after starting the car and attempting to drive, the car stumbles and loses throttle (to the point where I'm pressing the pedal down but not moving at all). After about a minute or two the problem mysteriously corrects itself and the car runs fine with no issues. I've noticed that if I start it and let it idle for a couple of minutes it seems to "work it out" and drive fine as well... but the CELs keep coming back after I clear them. I'm assuming that the low voltage is what is causing my car to behave this way, but I guess they could be two different things?

Low voltage is being measured right at the ECU, which tells me that for some reason my ECU isn't "seeing" what it should be seeing.

I'm running the basic Greddy kit at stock boost. Aside from the CELs and throttle issue when I start the car, everything runs fine. I got the car dyno tuned as well, and my AFRs are in perfect range... but still, these CELs won't go away.

I didn't have these cel's prior to installing emanage. For what it is worth, I had an AP1 harness that I converted to AP2 by following this diagram (I have a MY2005). A had a professional mechanic do the work and I doublechecked it, and all wires look to be exactly right.


EDIT: I think (hope) the problem is fixed! Turns out when I reconverted the EMU harness to the AP1 setup things worked well. I got tuned so I'm not running the wrong map.

 

flux capacitor gotta be

was this the kit hardtopguy was selling?

 

I think you have a bad ground somewhere or wiring issue, why not attach a fluke onto the sensor its self (piggyback) and open and close the TB manually and check voltage?

Also, doubtful but worth a check, have you checked the parameters settings inside the GEMU software? - there is a parameter window.

 

This I have not tried. So you're saying test voltage at open and closed throttle right at the EMU TPS input itself?

No, I haven't done this. To make matters even more fun, my laptop won't connect to my EMU. From what I've read, it is probably because I don't have the correct version of Windows (you need 32bit, I think?), but honestly, I'd just as soon not go screwing around with the tune that I paid the professional to do for my car because I'd be the first to admit I don't know what I'm doing with tuning.

 

No. I didn't even know he was selling one.

 

 

I'd start at the sensor its self, then the EMU harness etc.

I have a netbook running windowsXP runs/connects fine, it runs on my 64bit windows in compability mode (albeit crap formatted due to screen res etc) on my desktop but never connected it to the GEMU so doubt it would work. Obviously in the GEMU it shows you in real time and it would be either 0-5v (give or take a little) depending on how far you foot is on the accelerator pedal. I'd start looking in the GEMU sware first - since its a 20 second job, then the voltage at the sensor itself.