Odd issue with Kpro4 and Analog input
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Joined: Mar 2013
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Odd issue with Kpro4 and Analog input
Having an Odd issue with Kpro4, and I am hoping someone else has experienced something similar possibly with Kpro3 and an AEM failsafe.
My issue is that I need to insert an offset voltage for the analog input to be "accurate". Then, even once I have the offset voltage dialed in for a given AFR (we'll use 11AFR), once my AFR starts to go towards 13.5-14.0, it needs more offset added in. It also seems that the offset needs to be changed everytime I upload a new Kal. Almost like the linear slope is off, but I am using the values given by AEM.
With that being said, the fact that i need to have an offset voltage in general means I have an analog ground issue. As far as this goes, I am not sure how I can have a ground issue.. The Black failsafe ground is bolted to the cluster chassis ground by the hood release latch. The White failsafe analog output wire is connected to the purple An7 on the Kpro4 analog harness. The Brown failsafe analog ground is connected to 1 of the Kpro4 analog grounds on the analog harness. Further, to try to correct the issue, I took the 2nd Kpro4 analog ground and grounded it to the same cluster ground bolt as the failsafe gauge.
To add, I am not trying to use the AEM failsafe for it's failsafe, I bought it mainly for the fact it is a 2 in 1 gauge, displaying MAP and AFR. I merely want to use the UEGO portion as the Kpro4's Wideband and for closed loop operation (I can't do this if it won't output to Kpro correctly, or consistent). I could care less about outputting the MAP or using the failsafe feature of the unit, I'll use Kpro's functions.
My issue is that I need to insert an offset voltage for the analog input to be "accurate". Then, even once I have the offset voltage dialed in for a given AFR (we'll use 11AFR), once my AFR starts to go towards 13.5-14.0, it needs more offset added in. It also seems that the offset needs to be changed everytime I upload a new Kal. Almost like the linear slope is off, but I am using the values given by AEM.
With that being said, the fact that i need to have an offset voltage in general means I have an analog ground issue. As far as this goes, I am not sure how I can have a ground issue.. The Black failsafe ground is bolted to the cluster chassis ground by the hood release latch. The White failsafe analog output wire is connected to the purple An7 on the Kpro4 analog harness. The Brown failsafe analog ground is connected to 1 of the Kpro4 analog grounds on the analog harness. Further, to try to correct the issue, I took the 2nd Kpro4 analog ground and grounded it to the same cluster ground bolt as the failsafe gauge.
To add, I am not trying to use the AEM failsafe for it's failsafe, I bought it mainly for the fact it is a 2 in 1 gauge, displaying MAP and AFR. I merely want to use the UEGO portion as the Kpro4's Wideband and for closed loop operation (I can't do this if it won't output to Kpro correctly, or consistent). I could care less about outputting the MAP or using the failsafe feature of the unit, I'll use Kpro's functions.
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Depends on which failsafe ground you mean, I have the the black gauge ground going to chassis, tied in with my innovate oil press/temp ground. The brown failsafe ground is going to the analog ground. Did you put both failsafe (black and brown) grounds to the analog ground?
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https://www.hondata.com/help/kmanage...log_wiring.htm
I have since uninstalled this... I think just to brown to the analogue ground. You will need 2 grounds looks like, damn, its been over a year since I did this and have recently removed it all in place of Infinity.
I have since uninstalled this... I think just to brown to the analogue ground. You will need 2 grounds looks like, damn, its been over a year since I did this and have recently removed it all in place of Infinity.
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That's exactly what I did. I also looked up some of the other AEM gauges, and the 30-2310 has the same voltage slopes, and I tried those presets to no avail. I'm currently rewiring it hoping it is a loose connection, but I do not believe it is.
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Everything has been rewired with solder this time instead of crimp connectors. No difference.
Black gauge ground goes to chassis.
White gauge output signal goes to red AN0 (now) analog input
Brown gauge output ground goes to 1st black analog input ground.
2nd analog input ground goes to chassis.
I also tried ground the black gauge ground to the analog input ground, no difference. I also tried wiring both analog grounds to the brown output ground, no difference. The only thing I have not tried is grounding all to chassis.
Black gauge ground goes to chassis.
White gauge output signal goes to red AN0 (now) analog input
Brown gauge output ground goes to 1st black analog input ground.
2nd analog input ground goes to chassis.
I also tried ground the black gauge ground to the analog input ground, no difference. I also tried wiring both analog grounds to the brown output ground, no difference. The only thing I have not tried is grounding all to chassis.
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I "Fixed" this issue. After spending close to 10 hours total trying to re-ground and rewire everything, nothing worked. What I ended up having to do is change the slope of the input to Kpro. I spent 2 hours datalogging deviations in the reading from the Gauge & Kpro.
What I did was changed my Idle AFR (gauge reading) around quite a few times and multiple times of each to find the deviations. For instance, I set idle AFR to 15.7 and Kpro was reading ~14.6. I then set Idle AFR (using gauge) to 14.7 and Kpro was reading ~13.7. Setting Idle AFR (using gauge) to 13.7 gave a kpro reading of ~12.8. Idle AFR (gauge) of 12.7 would give me a reading of ~11.9. Idle AFR (gauge) of 11.7, Kpro would read ~11.0. finally an Idle AFR (gauge) of 10.7 would give a reading of 10.1 on Kpro. I did this multiple times to verify. Then using some graph paper I plotted AEM's Volt/Lambda. then I converted all my numbers to Lambda, and plotted them on AEM's linear line. I then shifted my plots to the right Horizontally, to where they would line up with AEM's plots vertically. I will try to get a picture of my graph, you will be able to see the difference in the slope. What I ended up getting for values were (0.5V = .58L) & (4.5V = 1.36L). For reference, AEM's slope is (0.5V = .58L) & (4.5V = 1.23L). I have now datalogged for another 2 hours or so using my slope settings, and Kpro matches the gauge dead on.
Why the slope is different, I don't know. it has to be an issue with my failsafe's output "processor" or harness.
What I did was changed my Idle AFR (gauge reading) around quite a few times and multiple times of each to find the deviations. For instance, I set idle AFR to 15.7 and Kpro was reading ~14.6. I then set Idle AFR (using gauge) to 14.7 and Kpro was reading ~13.7. Setting Idle AFR (using gauge) to 13.7 gave a kpro reading of ~12.8. Idle AFR (gauge) of 12.7 would give me a reading of ~11.9. Idle AFR (gauge) of 11.7, Kpro would read ~11.0. finally an Idle AFR (gauge) of 10.7 would give a reading of 10.1 on Kpro. I did this multiple times to verify. Then using some graph paper I plotted AEM's Volt/Lambda. then I converted all my numbers to Lambda, and plotted them on AEM's linear line. I then shifted my plots to the right Horizontally, to where they would line up with AEM's plots vertically. I will try to get a picture of my graph, you will be able to see the difference in the slope. What I ended up getting for values were (0.5V = .58L) & (4.5V = 1.36L). For reference, AEM's slope is (0.5V = .58L) & (4.5V = 1.23L). I have now datalogged for another 2 hours or so using my slope settings, and Kpro matches the gauge dead on.
Why the slope is different, I don't know. it has to be an issue with my failsafe's output "processor" or harness.
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