razzjp Posted June 5, 2023 Report Share Posted June 5, 2023 Hi, I recently changed my knuckles on my 350z and have to remove the ABS sensors from the front. I had one still plugged in, but the other one was unplugged. The car would idle high and the fans would not come on. Took a few minutes and kinda just guessed that was it but plugged it back in and restarted the car then it was fine. Did it twice to duplicate it. I did need see anything specific for this in the help section. Any ideas so I can remove these front ABS sensors would be greatly appreciated. Quote Link to comment Share on other sites More sharing options...
koracing Posted June 5, 2023 Report Share Posted June 5, 2023 Can you post a copy of your tune a log of both when the sensors are plugged in and unplugged? Seems strange that unplugging a front ABS sensor would have that affect, unless that is the source for speed in the ecu and it's triggering some kind of lockout. Quote Link to comment Share on other sites More sharing options...
razzjp Posted June 6, 2023 Author Report Share Posted June 6, 2023 Thanks, I think the ABS sensors provide the speed and are tied to the Engine Fan, driven speed lockout and maybe this is doing it, but not sure why that would make it idle higher, I will try to get some logs tonight. I am in Japan, so big time difference. With he one sensor unplugged I was not even able to manually force the fans on from the ecu. Quote Link to comment Share on other sites More sharing options...
razzjp Posted June 7, 2023 Author Report Share Posted June 7, 2023 I have attached my tune and a copy of the log with the ABS sensor disconnected. You can see the temps go up quick and the fan inactive. Work fine when connected. Also disregard Lambda 1 weird reading if you wonder why it is whacky. ECU Log 2023-06-7 5;36;27 pm.llgx accel adj 051523.pclx Quote Link to comment Share on other sites More sharing options...
koracing Posted June 7, 2023 Report Share Posted June 7, 2023 I actually can't see much as you did an ECU log without all the pertinent parameters. I see coolant temp rising from 80C to 87C. Can you take a PC log (hit F8 while connected with laptop) so all the parameters are logged and actually unplug the sensor while it's idling for 30 seconds, then plug it back in for 30 seconds? What happens if your idle speed control is set to closed loop? Quote Link to comment Share on other sites More sharing options...
razzjp Posted June 7, 2023 Author Report Share Posted June 7, 2023 Sorry, total newbie. I can tell you that once you unplug it the fan will stop running and the temp starts to rise. When you plug it back in nothing happens until the car is restarted then it is normal again. Fan is set to kick on at 80. I did not tune the car so have not really messed with settings, I will try the closed loop though and get another log. Quote Link to comment Share on other sites More sharing options...
razzjp Posted June 9, 2023 Author Report Share Posted June 9, 2023 OK so I went to run the PC log and decided to go closed loop as you suggested and this settled the idle but I know that I would have to set up the closed loop idle, but there was a speed lock source that was driven wheel speed. I put it back to open loop and turned the speed lock source "off' and the idle was fine. Got excited and forgot to check the fan, but I am in the right direction. May have to set the driven speed lockout to 0, but I will play with that if needed. It is a drift car, so I think having it at 0 will be fine. Thanks for the help on this! Quote Link to comment Share on other sites More sharing options...
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