So I have been having a bunch of problems with the o2 sensor delete. Tuner and I on and off the phone with Dynojet. So the issue that we are running into is the o2 sensor eliminators that came in the box keeps tripping the FI light with a C44 code (Heated oxygen sensor). The last eliminatoner dynojet sent was this daisy chain type with a box connected to it, that stops the FI light from tripping, but it doesn’t allow the bike to be tuned in the low throttle position. Any insite on this issue would be super helpful.
C44 -HO2 Sensor output Voltage is not input to ECM - HO2S Lead wire /Coupler Connection Battery Voltage Supply to the HO2S
I was thinking that but the issue goes away when I don't have the o2 Sensor delete plug installed (either bike plugged into stock 02 sensor or with the Daisy chain). Brain from R&D at Dynojet is going to call us on Monday and help us work it out. I believe it might be the O2 sensor plug might not have the correct resistance to say everything is okay though we checked both plugs. The reason I say this is doing some research on part numbers for the O2 sensor the 2018 has a different part number than any other year of GSXS750 and the other bikes that use that same O2 part number have model years started late 2017 and on.
We think we figured out the problem. It is that the heater has to be plugged in to the o2 sensor so we are making a custom plug that deletes the readings yet still heats the o2 sensor. Will know later this week if the tube works.
I have the same issue. Installed the PCV in my 2018 GSX-S750 Bought from Fuelmoto with map for my bike. At startup engine light and FI turned on. But after warmup they turned off.
Took it for a first ride today and after a few minutes it Came on again and are still on....
What to do? Can I use the bike?
Your issue is the o2 sensor plug dynojet sends. The computer wants to read that the o2 sensor is getting heated. You can run the bike with the stock sensor still connected it will just lean out in the lower throttle position so usually around city riding conditions but the fault will go away. When I have the part installed and tuned I will post a DIY on how to make the plug work and get rid of the fault hopefully. I also will try and post the service manual for the 2018 bikes once I get it back and can scan it in.
I connected the stock sensor but the fault was still there. Didnt start the bike just ignition. Do i need to reset? How?
Is it safe to use the bike with stock sensor or do i need To remove the PVC?
To reset ride the bike about 10 minutes FI light will turn off. It is safe to run the bike with the stock sensor you just won't be getting the full use of the map from the PCV. It will be running the low throttle off the computer and the high throttle of the PCV.
Talked to dynojet by mail and they said "Keep stock o2 no problem it will run perfecly"
Why send a eliminator plug if it isnt necessary and will trigger fault codes?? And I got this response "The PCV was originally tested and developed on a 2015 North American model. The supplied O2 Optimizer worked on those models. It does not work on newer European spec models. It is no longer supplied in the kit. Your kit was produced before that change was implemented. "
Then its now problem , dont use the eliminator... or just a quick answer because there is no fix...
I am no expert but here is my thoughts: The connector that the o2 sensor is connected to is a 4 pin with 4 cables 2 of them is sensor and 2 is power to heater If you connect the eliminator provided by Dynojet you only connect a resistance to the ECM giving it a fauls value not connecting the other 2 leads to a c44 code
what happens if you connect the other wires to the stock o2 sensor
Wouldnt ECM get signal from resistor and still be able to send power to o2 sensor= no engine light and no FI
(Sorry for bad spelling i am from sweden )
Last Edit: Aug 16, 2018 14:44:16 GMT -6 by Rosberg
Rosberg you have everything completely correct. My tuner and I have been working on making a custom map for the bike and the only way the it will work and run at peak efficancy at all levels is to figure out a way to get it into closed loop (no fuel values from Ecu). The bike accepts tunes in 40%-100% throttle position from the PCV. So the o2 sensor and the fault code are tripping the bike to run lean. The bike has potiental to run better but due to emissions standards it must lean out in these lower areas. Most tuners will send you out the door with a half tune the way it is because they didn’t want to trouble shoot with the customer. I will call tomorrow to see if we finally figured out this problem or if I just have to accept it the way it is.