Rad fan settings

[toyman]

The 94-95 rad fans are two speed. LS3 for Hi and LS5 for Low. I want the low to come on at 180* and off at 190* with the Hi coming on at 190*. So I set the rad in functions to come on at 180* and off below 180*. LS5 is set active when coolant is "less than 190*" and LS3 is set active with coolant "at least 190*". However, it's not working that way. With those settings the fan only comes on at 190* and above (I'm assuming that is the LS3 Hi). If I set LS5 functions also active the fan stays on below 180*. That makes sense as LS5 is set for "less than 190*" but that overrides the 180* on/off point. What am I missing? Why won't LS5 come on between 180* and 190* with the above settings?

[toyman]

The 94-95 rad fans are two speed. LS3 for Hi and LS5 for Low. I want the low to come on at 180* and off at 190* with the Hi coming on at 190*. So I set the rad in functions to come on at 180* and off below 180*. LS5 is set active when coolant is "less than 190*" and LS3 is set active with coolant "at least 190*". However, it's not working that way. With those settings the fan only comes on at 190* and above (I'm assuming that is the LS3 Hi). If I set LS5 functions also active the fan stays on below 180*. That makes sense as LS5 is set for "less than 190*" but that overrides the 180* on/off point. What am I missing? Why won't LS5 come on between 180* and 190* with the above settings?

No one can help set this up?

[toyman]

Surely someone has played with these settings. What are the settings in your cal file?

[kruser02]

Have you tried setting the basic high setting to activate when "at least" 210 and the basic low setting to 205, also adding the "Rad Fan" function and adjusting its settings for fan on above say 185 and off below 185?  That should keep you from sending conflicting signals.

[toyman]

Have you tried setting the basic high setting to activate when "at least" 210 and the basic low setting to 205, also adding the "Rad Fan" function and adjusting its settings for fan on above say 185 and off below 185?  That should keep you from sending conflicting signals.

Apart from changing the on/off values what are you telling me to change in the settings? LS3 (hi) is set with the "at least" turned on. I'm not certain from your reply what I set for the LS5 (lo). Are you saying that I should just check the basic active box, function box and rad fan box all linked to LS5. Is LS5 commanded to be "less than" 205* in your example? In you example what fan is on between 205* and 210*?

[kruser02]

Apart from changing the on/off values what are you telling me to change in the settings? LS3 (hi) is set with the "at least" turned on. I'm not certain from your reply what I set for the LS5 (lo). Are you saying that I should just check the basic active box, function box and rad fan box all linked to LS5. Is LS5 commanded to be "less than" 205* in your example? In you example what fan is on between 205* and 210*?

Sorry I wasn't clear.  I was trying to use arbitrary temperatures to describe the settings I was referring to.  For your settings, what I meant to say was:
LS3 - High Fan - "at least" 190 for basic setting only, no rad fan function
LS5 - Low Fan - "less than" 190 for basic setting and rad fan also active with off below/on above set to 180

Maybe this is what you have already tried?  I will be testing these settings myself tonight if the sockets show up so I can wire my 70amp relays.  I am running a Mark VIII fan in my '88 with a 1401 box.  Are you running a stock fan?

[toyman]

Apart from changing the on/off values what are you telling me to change in the settings? LS3 (hi) is set with the "at least" turned on. I'm not certain from your reply what I set for the LS5 (lo). Are you saying that I should just check the basic active box, function box and rad fan box all linked to LS5. Is LS5 commanded to be "less than" 205* in your example? In you example what fan is on between 205* and 210*?

Sorry I wasn't clear.  I was trying to use arbitrary temperatures to describe the settings I was referring to.  For your settings, what I meant to say was:
LS3 - High Fan - "at least" 190 for basic setting only, no rad fan function
LS5 - Low Fan - "less than" 190 for basic setting and rad fan also active with off below/on above set to 180

Maybe this is what you have already tried?  I will be testing these settings myself tonight if the sockets show up so I can wire my 70amp relays.  I am running a Mark VIII fan in my '88 with a 1401 box.  Are you running a stock fan?

I'm running the stock fan. I am currently out of town but I believe the settings were as you described. I
ll check next week when I return

[kruser02]

Finally got to test mine tonight.  The low fan comes on at 180 like clockwork.  I did not drive the car hard enough for the high fan to come on, so I cannot verify it, but don't see why it wouldn't work.  If the settings I posted don't work, I would test your outputs using the tps test and make sure they are both functioning properly.

[toyman]

It works as you described except that if the rad function is activated the Lo fan will come on at any reading below 180*. If I turn off that activation and set the rad on/off at 180* then everything works fine. Lo on between 180 to 190 and Hi fan at 190*+.

[kruser02]

Glad you got it working!

[JulianSerna]

I just got my AEM 30-1401 installed on a SN95 running AEMPro and I want to spend some time trying to get the car to simply start. My problem is that as soon as I turn the ignition to the ON position, the fan comes on and I am concerned about draining the battery. I really would like to learn how to control my fan speed options, but I dnt' even know how I can navigate my way to the above mentioned LS3 and LS5 options. Can someone please give me a fan controls 101 lesson?

Sincerely,
Julian Serna

[Blacksaleen95]

The fan controls are based off the outputs in the ems. If you go into the aem pro software, you'll have two outputs, ls3, ls5 that are assigned to fan controls.

Go to options-configure outputs, select either ls3 or ls5, the coolant temp shown will control the temp the fan kicks on.

[JulianSerna]

Thank you so much for your quick reply. I started with the 1401_AEMBar_19 pph inj.V1.19 calibration and did exactly as you described. After saving the cal file (File, Save), do I have to do a ECU, Send New Calibration to upload the changes to the AEM, or does the fact that I am connected to the AEM take care of this automatically when I save the calibration to my PC?

Sincerely,
Julian Serna

[toyman]

Thank you so much for your quick reply. I started with the 1401_AEMBar_19 pph inj.V1.19 calibration and did exactly as you described. After saving the cal file (File, Save), do I have to do a ECU, Send New Calibration to upload the changes to the AEM, or does the fact that I am connected to the AEM take care of this automatically when I save the calibration to my PC?

Sincerely,
Julian Serna

If you are connected to the AEM the new calibrations are automaticlly saved in current the Workmap file. That`s why you want to also create a new file name using the `save as` button. I incorporate a date code in the file name so I have a file date reference. Just so that you know when you turn on the ignition the CCRM  does a quick diagnostic routine which will turn the rad fan on for a moment ot two.

[JulianSerna]

Hello toyman,

Can you plesae attach your calibration file or send it to me at julianserna@hotmai.com? I understand most of what you are saying except for the Rad Fan parameters. I would like to see exactly what they look like so I can grasp he whole concept about the Rad Fan Functions. My concern is blowing my fan up if I have both fans running at the same time.

I can understand turning LS5 on At Less Than a certain temperature, and turning LS3 on At Least a certain temperature, but how do I tell LS5 to turn on At Less than 190 and then off below 180? I dnt get the concept of turning fans off, I only see options for turning fans on!
 

Sincerely,
Julian Serna