TPS1 and TPS2 disagree...P2135...need some help getting data for baseline
Posted: Mon Feb 17, 2020 9:27 pm
All,
Could use some help diagnosing an issue with my 14 L77 setup. I have a few variables which all seem to be working properly, but the combination isnt. At this time i can not keep up with traffic as the code and reduced power mode happen when accelerating I have correlated this to be when at about 85KPA, though that may not be relevant. A Log of this happening is attached.
If possible, could someone please log their TPS1 and TPS2 voltages and % using the pedal? attached are the values i am getting now, which i think is causing the reduced power mode and dead pedal with a P2135 code and the occasional P0222.
Basically, I am getting huge differences with the TPS1 and TSP2. Using the pedal at 0%, i am getting TSP1 ~21%/3.51V and TPS2 8%/1.45V. At WOT, that changes to TPS1 68%/1.9V and TPS2 26%/3.04V. When i manipulate the throttle by hand, they agree at 0% with TPS1 4.31V, TPS2 0.65V when closed, and WOT at TPS1 99.6%/0.57V and TPS2 at 41%/4.39V. The log is attached as is the tune i am using.
I also used the attached P2135 troubleshooting pdf which has passed all the steps, which means the TB needs to be replaced. I have two more ACDelco TBs coming in tomorrow and will use them to troubleshoot, but i am guessing that this will not solve it.
Something else i have noticed, though it may not be relevant, is that the throttle position doesnt seem to match the PIDs/signals available. I circled the ones below which i am referring to. It is supposed to be following the Absolute Throttle, but doesnt seem to correlate properly. I even get some weird noise/oscillation in the signal as well which clears up in the log.
The variables in this system though....
1. '14 L77 using a 2bar custom OS from the hptuners, which has not been tuned yet....this may be causing the huge disagree with % throttle even though the voltages are reasonable, but i have no way to confirm this. I am hoping that someone can offer up their TPS1/2 % and voltage for comparison
2. the throttle pedal is a truck part number, done because of the harness i am using. I have the original pedal and plug, but am not convinced this is the issue as it is recognizing the 0-100% throttle positions correctly.
3. the truck has not been tuned yet...though i am not aware of this being able to fix something like this
4. i have tested already with 2 different TBs, and they are within 0.02V on both extremes...so either have two bad TBs, or something else is going on.
5. I am running a dual TB setup, which is being driven by a X2D unit from TorqueRush....but i have the same data as above with the unit plugged in and not connected at all. I do not think the X2D is the issue here....it is a 'invisible piggyback' on the system and I cannot see any data differences
6. I can get a clone e38, but will have to reflash it again and use some credits, so thats a $350 non-refundable troubleshooting device...not sure i am ready to go there.
happy to provide any further information which may be relevant....at this point i feel like i am spinning my wheels trying to figure this out.
Thanks in advance!
~Ryan
Charleston, SC
Could use some help diagnosing an issue with my 14 L77 setup. I have a few variables which all seem to be working properly, but the combination isnt. At this time i can not keep up with traffic as the code and reduced power mode happen when accelerating I have correlated this to be when at about 85KPA, though that may not be relevant. A Log of this happening is attached.
If possible, could someone please log their TPS1 and TPS2 voltages and % using the pedal? attached are the values i am getting now, which i think is causing the reduced power mode and dead pedal with a P2135 code and the occasional P0222.
Basically, I am getting huge differences with the TPS1 and TSP2. Using the pedal at 0%, i am getting TSP1 ~21%/3.51V and TPS2 8%/1.45V. At WOT, that changes to TPS1 68%/1.9V and TPS2 26%/3.04V. When i manipulate the throttle by hand, they agree at 0% with TPS1 4.31V, TPS2 0.65V when closed, and WOT at TPS1 99.6%/0.57V and TPS2 at 41%/4.39V. The log is attached as is the tune i am using.
I also used the attached P2135 troubleshooting pdf which has passed all the steps, which means the TB needs to be replaced. I have two more ACDelco TBs coming in tomorrow and will use them to troubleshoot, but i am guessing that this will not solve it.
Something else i have noticed, though it may not be relevant, is that the throttle position doesnt seem to match the PIDs/signals available. I circled the ones below which i am referring to. It is supposed to be following the Absolute Throttle, but doesnt seem to correlate properly. I even get some weird noise/oscillation in the signal as well which clears up in the log.
The variables in this system though....
1. '14 L77 using a 2bar custom OS from the hptuners, which has not been tuned yet....this may be causing the huge disagree with % throttle even though the voltages are reasonable, but i have no way to confirm this. I am hoping that someone can offer up their TPS1/2 % and voltage for comparison
2. the throttle pedal is a truck part number, done because of the harness i am using. I have the original pedal and plug, but am not convinced this is the issue as it is recognizing the 0-100% throttle positions correctly.
3. the truck has not been tuned yet...though i am not aware of this being able to fix something like this
4. i have tested already with 2 different TBs, and they are within 0.02V on both extremes...so either have two bad TBs, or something else is going on.
5. I am running a dual TB setup, which is being driven by a X2D unit from TorqueRush....but i have the same data as above with the unit plugged in and not connected at all. I do not think the X2D is the issue here....it is a 'invisible piggyback' on the system and I cannot see any data differences
6. I can get a clone e38, but will have to reflash it again and use some credits, so thats a $350 non-refundable troubleshooting device...not sure i am ready to go there.
happy to provide any further information which may be relevant....at this point i feel like i am spinning my wheels trying to figure this out.
Thanks in advance!
~Ryan
Charleston, SC