Cooling fan and O2 sensor issues
Thread Starter
Joined: Feb 2004
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From: jacksonville, fl
Cooling fan and O2 sensor issues I've searched and I can't seem to find any kind of definitive answer. I have the car in sig, and I have everything wired up. My tuner commands the fans to on and they don't come on. I have a 24x reluctor wheel for this setup. It's a 411 ecu from a truck of some kind. However, if I disconnect my two fan signal wires from the ecu ( the green and blue wires) and take them to ground, the fans will turn on. If I ground them one at a time they will come on.
So where do I go from here? It's a speartech harness and everything is pinned correctly. I spoke with john and he said they check all harnesses before they leave and it worked correctly. So, since I physically ground the wires and the fans go on, that means that there is either an issue in my tune or ecm correct?
Other issue is I have the black square O2 sensor connectors and I bought O2 sensor part number 13444. My tuner says that they are just sitting there in default.
Any thoughts at all on either of these issues. I am at my whits end with this. Any and all help is greatly welcomed. Thank you
Daniel
So where do I go from here? It's a speartech harness and everything is pinned correctly. I spoke with john and he said they check all harnesses before they leave and it worked correctly. So, since I physically ground the wires and the fans go on, that means that there is either an issue in my tune or ecm correct?
Other issue is I have the black square O2 sensor connectors and I bought O2 sensor part number 13444. My tuner says that they are just sitting there in default.
Any thoughts at all on either of these issues. I am at my whits end with this. Any and all help is greatly welcomed. Thank you
Daniel
On The Tree
Joined: Sep 2007
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Do you know if you have your fan relays wired corectly. They need to go to the ground/trigger side of whichever relay you are using... That way when the PCM tells the fans the kick on it grounds the wire internally.
If you have a tech 2 or after about two minutes on blue/red PCM or 4 minutes at idle on a blue/green PCM the short term fuel trims should start trimming out. Unless your tuner has disabled something.
Did speartech do the ECM and did anything work before the tuner started dabbling?
The fans on a speartech tune typically come on around 192-200 degrees I believe. So let your car warmup and see if the primary comes on around there (If speartech did the tune) Truck computers by default don't typically utilize fans and if you didn't get PCM from Speartech then the fans may be disabled and need to be altered in HP Tuners or the like.
If you have a tech 2 or after about two minutes on blue/red PCM or 4 minutes at idle on a blue/green PCM the short term fuel trims should start trimming out. Unless your tuner has disabled something.
Did speartech do the ECM and did anything work before the tuner started dabbling?
The fans on a speartech tune typically come on around 192-200 degrees I believe. So let your car warmup and see if the primary comes on around there (If speartech did the tune) Truck computers by default don't typically utilize fans and if you didn't get PCM from Speartech then the fans may be disabled and need to be altered in HP Tuners or the like.
Thread Starter
Joined: Feb 2004
Posts: 1,667
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From: jacksonville, fl
Yes sir, fan relays are done correctly. I have a bp automotive fan kit and I called and talked to them today.
Speartech did not do any tuning for me, I did call john today and he said they check the harness before it leaves to make sure everything works correctly.
My tuner tried to command the fans on yesterday and we got nothing.
From everything that I have read and from talking to people today, it seems like there is an issue either in the pcm or the tuning. I'm going to call the tuner tomorrow and talk to him about that.
Just for fun I checked and verified that the O2 sensors connectors were wired correctly for a ls1 camaro and they were. I double checked my ground on the back of the head and it seems good. All other chasis grounds were good too.
Thank you so much for your thoughts bud! I really appreciate it. If you have any other thoughts please feel free ��
Speartech did not do any tuning for me, I did call john today and he said they check the harness before it leaves to make sure everything works correctly.
My tuner tried to command the fans on yesterday and we got nothing.
From everything that I have read and from talking to people today, it seems like there is an issue either in the pcm or the tuning. I'm going to call the tuner tomorrow and talk to him about that.
Just for fun I checked and verified that the O2 sensors connectors were wired correctly for a ls1 camaro and they were. I double checked my ground on the back of the head and it seems good. All other chasis grounds were good too.
Thank you so much for your thoughts bud! I really appreciate it. If you have any other thoughts please feel free ��
This could be the problem.
The Gen III trucks typically didn't have the fans enabled in the calibration from the factory. I'm not sure what software your tuner is using, but I know HP Tuners can change this setting. If I remember correctly the fans won't work at all unless the setting(s) are proper. On a stock truck calibration one fan output controls the AC recirculation door or something and I can't remember what the other pin does.
The Gen III trucks typically didn't have the fans enabled in the calibration from the factory. I'm not sure what software your tuner is using, but I know HP Tuners can change this setting. If I remember correctly the fans won't work at all unless the setting(s) are proper. On a stock truck calibration one fan output controls the AC recirculation door or something and I can't remember what the other pin does.
Thread Starter
Joined: Feb 2004
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From: jacksonville, fl
I read a lot about that the other day, and it is definitely something I plan on talking to him about today. Thanks for backing up that idea even more bud! I really appreciate the help
On The Tree
Joined: Sep 2007
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I'm on mobile and can't see Sig but if you can have the tuner start with a camaro based file and tune from there. Should yield better results and oxygen sensors should work and so would fans.
Good luck and hope you can get it sorted.
Good luck and hope you can get it sorted.
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Thread Starter
Joined: Feb 2004
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From: jacksonville, fl
I haven't been able to get in touch with my tuner yet, but if I'm throwing a code for flex fuel, then it's a pretty good bet that I don't have a camaro O/S to begin with correct?
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Verdad Gallardo On The Tree
Joined: Sep 2007
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Good. See if you can get that camaro based file uploaded then and utilize it and start tuning from their. MAF will have to be accounted for if you are using 5-Pin LS2 or other. Don't forget to mention that to the tuner.
Good luck bud!
Good luck bud!
Thread Starter
Joined: Feb 2004
Posts: 1,667
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From: jacksonville, fl
Forgot to update this, took my car to a different tuner who used differnt software. He was able to find that the fans were turned off and that the other tuner never took the ecu out of speed density. So that explains why the O2's weren't responding and the fan issue with them never being turned on. But the car is running like a champ and I highly recommend Bp's three fan relay setup. Only 5-6 wires that needed to be hooked up and came with all necessary relays. Thanks again to everyone who responded.