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Thread: Another option for $0D efan control

  1. #46
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    I only see 4 wires, on that plug there are two big and two small. How does that controll two fans? I would think the two small ones turn it on, and the two bing ones for the power (just like a normal relay)
    Or is there a seperate one for each fan?
    I apologize. We have 25-30 Chrysler vans in our fleet. I just checked wiring diagrams and these modules are wired to two fans in parallel so one relay controls both fans together. The reason it seemed like they control fans independently is because some vans have an additional control circuit for one fan based on A/C input.

    The pictures I posted are from a site that had prices ranging from $30 to $50. Name starts with rockaut.

  2. #47
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    Quote Originally Posted by PJG1173 View Post
    1. if fan A is active will fan B be set to inactive or do I have to wire the relays so both the high and low relay's won't be energized at the same time?
    That's a good point that I didn't think about while putting this together. Both Fan A and Fan B will be on separate relays and both can operate at the same time. So will this hurt a two speed fan? I don't think it will, but at the moment I'm not sure. (EDIT: Looking at this further, looks like for a two speed fan you will need wiring that prevents both speeds from operating at once. I'll try to come up with a schematic.)

    Quote Originally Posted by PJG1173 View Post
    2. tps for fan on. is this the tps % if I want the fan to come on reguardless how fast I am going? will this override MPH for fan off?
    Yes, this will override everything else except "Overheat Temperature for Fan On".

    Quote Originally Posted by PJG1173 View Post
    3. if I don't want to use MPH for fan off will leaving it at 0 disable it or do I need to set it at some really high number same with TPS?
    If you don't need the MPH for fan off then set it to the maximum. The "TPS for Fan On" can not be disabled, but if you set it to 100% it will operate the least.

    1project2many:

    I don't know about the first relay (902310.jpg), but I have tried the second one (dr1088.jpg) and it will not work with this code. I don't remember off hand exactly why, but had to do something with a timed circuit, which may be for the A/C.
    Last edited by 93V8S10; 02-25-2012 at 12:22 PM.

  3. #48
    EFI GearHead ! EagleMark's Avatar
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    I guess it depends on the vehicle but I can't see a reason for needing fan on at say 50 MPH? Unless the other fan is for a tranny cooler not mounted in front of radiator?

    Some Dodge diesel trucks had a trans cooler under bed of truck with fan, cool find in JY. I can't see keeping and auto tranny to cool? Charts all seem to indacate cooler eqauls longer life, what would be a minimum for tranny temps in like alaska temps? There must be a point where warming would be advantage but it's usually heat that kills them...

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  4. #49
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    I can't find a schmatic that will work with the soft start, so I'll have to make one.
    Last edited by 93V8S10; 02-25-2012 at 02:14 PM.

  5. #50
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    Quote Originally Posted by EagleMark View Post
    I guess it depends on the vehicle but I can't see a reason for needing fan on at say 50 MPH?
    when I race at the local mud bogs its not uncommon for me to see wheel speed of 70+ mph with a ground speed of 1 mph. tps % on will really come in handy for this though. I have a schematic for regular relays to power a two speed fan so both don't get power the same time. just have to find it.
    87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
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  6. #51
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    here is a link to the schematic i am going to modify to work with my setup. Let me know if this looks good. I'll post up a schematic of the finished wiring.

    http://www.s10forum.com/forum/f62/ta...4/#post5244385
    87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
    93 S10, 12" spring lift, 4.56 gears, F/R lockers, 36x12.5x15 TSL's, long tube headers, 266HR cam, p&p vortec heads, $0D Marine MPFI.
    05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,

  7. #52
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    Are you going to be using soft start?

    If your not using soft start then that will work if you connect pin 86 of relay 1 to pin E3(Fan A) and pin 86 of relay 2 to pin E7(Fan B). Then connect pin 85 (both relays) to switched +. If you want override switches connect one side of the switch to pin 86 and the other to ground.

    If your using soft start then it won't work because the Hella relays don't have pin 87A. You can try wiring it like the attachment below.
    This isn't a perfect solution, the switching relay should be solid state, but may be OK since it's very low amperage.
    Attached Images Attached Images
    Last edited by 93V8S10; 02-25-2012 at 02:19 PM.

  8. #53
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    For those wanting to use duel fans with one fan on, for low and both fans on, for high. Then try the schematic in Post # 30. Thanks one92rs!

    Use the right cooling fan as the low speed, controlled with Fan B.
    Use the left cooling fan as the high speed, controlled with Fan A.
    If using the soft start option with high speed then you will need a solid state relay for the Cool Fan 1 Relay position.
    Last edited by 93V8S10; 02-25-2012 at 03:57 PM.

  9. #54
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    I have been meaning to ask this for a while, I have an electric water pump on my Camaro, and due to the routing of the cooling system it takes forever to heat up because the water pump's flowrate. I would like to get the pump to run at say 25% at start up and stay at that speed, then from 150* to 190* ramp up to 100% as the temp rises.

    I had previously thought about using a brushed motor speed control (ESC) like those used in RC cars, to handle the load side of the equation, and using a simple circuit to change the temp sensor output to a compatible PWM signal to control the ESC. But if this PWM control is cabable of controlling the pump through a solid state relay, that would be great. I was thinking of making a table of temp values and the associated PW or duty cycle that the ECM would command.

    How hard would this be implement? I have been looking over your code, and parts are starting to make sense, but I still don't think I could handle it myself.
    1978 Camaro Type LT, 383, Dual TBI, '7427, 4L80E
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  10. #55
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    Quote Originally Posted by gregs78cam View Post
    I have been meaning to ask this for a while, I have an electric water pump on my Camaro, and due to the routing of the cooling system it takes forever to heat up because the water pump's flowrate. I would like to get the pump to run at say 25% at start up and stay at that speed, then from 150* to 190* ramp up to 100% as the temp rises.

    I had previously thought about using a brushed motor speed control (ESC) like those used in RC cars, to handle the load side of the equation, and using a simple circuit to change the temp sensor output to a compatible PWM signal to control the ESC. But if this PWM control is cabable of controlling the pump through a solid state relay, that would be great. I was thinking of making a table of temp values and the associated PW or duty cycle that the ECM would command.

    How hard would this be implement? I have been looking over your code, and parts are starting to make sense, but I still don't think I could handle it myself.
    I've never done an electric waterpump, but why would it take longer to warm up if thermastat was closed?

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  11. #56
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    That could be done, but not with this code, it only operates in PWM for a second or so. I'm not sure how hard it would be, but I don't think it would be real bad. The soft start section of this code is the first code that I've written from scratch, before that all I had done was minor tweaks. Its hard to say how long it took me to get a handle on the basics of doing coding, but I would guess at about 6 mounts of spare time, just reading and trying different things. How quick for you would depend upon your available time.

  12. #57
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    ok got wires added to the ecu loaded the code for fan A and B. did not do the soft start. Using a volt meter I am monitoring for ground on E3 and e7. I am showing a ground for fan A. no ground on fan b. engine is not up to temp and no thresholds have been reached that should have activated fan A. this is what I have set


    Fan A calibration
    Overheat temp for fan on 209.8
    Temp for fan on 194.9
    Temp for fan off 185.5
    MPH for fan off 60
    TPS for fan on 14.8
    minium fan run time 30 sec
    use fan a with a/c set
    fan b calibration
    Overheat temp for fan on 215
    Temp for fan on 185.5
    Temp for fan off 177.4
    MPH for fan off 55
    TPS for fan on 99
    minium fan run time 20 sec
    use fan a with a/c not set


    If i leave Overheat temp for fan on for fan B at -40 it will show ground on that pin. I'm going to keep messing with the settings to see if I can get fan A to work.
    Last edited by PJG1173; 02-25-2012 at 05:00 PM.
    87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
    93 S10, 12" spring lift, 4.56 gears, F/R lockers, 36x12.5x15 TSL's, long tube headers, 266HR cam, p&p vortec heads, $0D Marine MPFI.
    05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,

  13. #58
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    A easy way to see whats going on, is to wire up a small light to each pin.

    Be sure to look over all of the set-up stuff too, may be a mistake there.
    Are you using $0D or $E6?

  14. #59
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    Im running 0d. to test I have my volt meter connected to b+ and the ground connected to the ecu output. it appears that fan be is working properly. I double checked the install tables and the enable fields. no matter what I do I keep getting ground for fan A. attached is my bin i'm working from.
    Attached Files Attached Files
    87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
    93 S10, 12" spring lift, 4.56 gears, F/R lockers, 36x12.5x15 TSL's, long tube headers, 266HR cam, p&p vortec heads, $0D Marine MPFI.
    05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,

  15. #60
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    Quote Originally Posted by EagleMark View Post
    I've never done an electric waterpump, but why would it take longer to warm up if thermastat was closed?
    Because the coolant flows through engine, out the back of the manifold, through the heater core, through the radiator, and finally back to pump, until the thermostat opens. <50* outside and it takes forever to warm up while driving, due to the airflow through radiator, even without the fan on. I have contemplated moving the return from the heater core to the bottom of the radiator so the water returning spends less time in there but that requires rewelding fittings and making a new heater hose.
    1978 Camaro Type LT, 383, Dual TBI, '7427, 4L80E
    1981 Camaro Z-28 Clone, T-Tops, 350/TH350
    1981 Camaro Berlinetta, V-6, 3spd
    1974 Chevy/GMC Truck, '90 TBI 350, '7427, TH350, NP203, 6" lift, 35s

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