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Thread: LS2 Fan Logic or lack thereof?

  1. #41
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    Does anyone have any idea why on my C6 (2008 LS3 A6) does the Fan Desired % from the table not actually command that to the fan? ie I'm sitting in my car right now and my ECT is 203 F, but I'm only getting 35% FAN% and 36% FAN Desired% per the Scanner yet my table (below) is calling for 68.x%. Is it a clutch type situation?

    Code:
    ECT	192	196	199	203	207	210	214
    Fan  %	0.0	25.0	46.6	68.3	89.9	89.9	89.9
    Thanks!
    Last edited by RWTD; 04-17-2014 at 07:48 PM.
    Formerly known as RWTD

    Toys: '22 Tesla Model S Plaid / '20 Chevy Duramax / ?20 Sea-Doo RXT-X (2)

  2. #42
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    Quote Originally Posted by RWTD View Post
    Does anyone have any idea why on my C6 (2008 LS3 A6) does the Fan Desired % from the table not actually command that to the fan? ie I'm sitting in my car right now and my ECT is 203 F, but I'm only getting 35% FAN% and 36% FAN Desired% per the Scanner yet my table (below) is calling for 68.x%. Is it a clutch type situation?

    Code:
    ECT	192	196	199	203	207	210	214
    Fan  %	0.0	25.0	46.6	68.3	89.9	89.9	89.9
    Thanks!
    You do not have a clutch. " C6 Corvette.2005-2011, inc. Z06/ZR1 The factory Coolant Fan is powerful and incorporates a solid-state controller instead of relays (as in previous years and models)."

    Try these settings. These worked for me w/ a 160*F t-stat.

    FAN Desired % vs. ECT
    192*F
    25 66 74 78 80 84 86 87 88 90 90 90 90 90 90 90 90
    Last edited by moddman; 08-11-2015 at 02:33 AM.

  3. #43
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    Hi Guys,

    I have been trying on LS1tech and got some responses and help, but im not there yet.
    I have a GMPP LS3(76-525), with the correct ecu and harness.
    Everything is working great, except for the fans.
    The fans come on once the engine reach the adjusted temp, and never stop.
    I need to kill the engine and restart to stop the fans.

    When i use the VCM controls fan control, I can control them on and off.
    but in automatic modes they dont work.
    I have 2 Spal fans switched by 2 bosch relays, which are switched by the fuse box blue wire.
    you guys have any ideas, this problem is there ever since i got the engine.

  4. #44
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    Quote Originally Posted by patrick335d View Post
    I have 2 Spal fans switched by 2 bosch relays, which are switched by the fuse box blue wire.
    you guys have any ideas, this problem is there ever since i got the engine.
    Do you have a wiring diagram showing your relay arrangement? Perhaps your have your relays wired to self-latch. You say they are swtiched by "the fuse box blue wire" - what wire is that? Your relays should each be getting a different ground signal directly from the ECM i.e. 2 separate wires, not one.

  5. #45
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    Quote Originally Posted by TheBandit View Post
    Do you have a wiring diagram showing your relay arrangement? Perhaps your have your relays wired to self-latch. You say they are swtiched by "the fuse box blue wire" - what wire is that? Your relays should each be getting a different ground signal directly from the ECM i.e. 2 separate wires, not one.
    GMPP wiring harnesses only have one fan wire (as described by patrick335d) available to the user. The Fan 1 (Low) and Fan 2 (High) outputs are actually spliced (merged) together, into a single wire output. You can separate these if two fan outputs are required.

  6. #46
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    I know this subject has been beaten like a dead horse but I haven't seen my scenario covered. I have an 07 E38 in a swap. I have one Spal fan that I currently have wired through a toggle and a relay. I would like to use the ECM control so the fan will not run if the engine is cool enough without having to switch it off manually. I understand the settings to make it work but everything I have seen so far is for two fans. My question is should I join both high and low wires from the ECM (Like the GMPP harness) or just use one of them? Fan high or low?

    Any help would be greatly appreciated!

    Eric

  7. #47
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    hello Friends , How to set the appropriate value for the fan ?

  8. #48

  9. #49
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    Hi Guys,

    I have E67 ecu. from CTS-V- LSA engine.. When I set to PWM Electric, I am not getting the signal out of the pin 49. I tried all. I can see in the VCM scanner that the desired speed is changing, but nothing else is happening. When I switch to discrete it works normally.
    I really tried.. a lot. meassure with oscilloscope. And there is no output. We went trough all my setting with Brandyn, but didn't find the reason.. Has anyone advice? on this?

    Petr

  10. #50
    Tuning Addict blindsquirrel's Avatar
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    Try the other one, PWM EV. No, I don't know what the actual difference is supposed to be between the two PWM options, I asked and either nobody knows or nobody cares enough to answer.

    I have an E40 that does the exact same as yours, but only when using the PWM EV setting. Nice valid signal on the oscilloscope using PWM Electric, nothing at all using PWM EV.

  11. #51
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    My oem pwm ev fan on my 2018 Chevy Colorado has only 3 wires... black red and green.
    The spal replacement Fan has 4... same plug but it has red black yellow and white.

    Am I screwed here on this?

  12. #52
    Tuning Addict blindsquirrel's Avatar
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    https://wizardcooling.com/spal-brushless-fans/

    Scroll to the bottom of the page. There is a diagram.

  13. #53
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    Pm... asking for a phone number. My kids are killing mr

  14. #54
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    So theoretically I can run red to red, black to black and the oem green (it’s actually green/white) to the spal white... and leave the spal yellow unused?

    The factory manual says black ground, red positive battery voltage and the green wire is “cooling fan speed signal”
    Last edited by fifty; 09-20-2020 at 03:48 PM.

  15. #55
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    Solution---YES THAT WILL WORK.

    Quote Originally Posted by fifty View Post
    So theoretically I can run red to red, black to black and the oem green (it?s actually green/white) to the spal white... and leave the spal yellow unused?

    The factory manual says black ground, red positive battery voltage and the green wire is ?cooling fan speed signal?


    Solution---YES THAT WILL WORK.

  16. #56
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    So far no fan when ac or defrost kicks in.
    Waiting for water temp. Still only up to 212
    I think stock tune doesn’t turn on until 221 which seems high but it’s what was in the tune


    I got up to 223? and no fan. Turned ac on: no fan. Turned defrost on: no fan.
    Last edited by fifty; 09-20-2020 at 06:46 PM.

  17. #57
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    I need to figure out what signal the spal fan is looking for on the white wire and yellow wire...and then what signal the Gm ecu is putting out on that green wire.

    And then find out if I can get the oem ecu to send that signal in relation to the heat and fan % of the oem tune...

  18. #58
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    Found the following on the factory manual. Maybe someone who knows what the spal fans need in the terms of signal can help me with the tune. The factory fan is also a pwm ev which I can confirm is electronic controlled viscous. I wonder if I need to change the fan type in the tune and the desired % numbers:

    Circuit/System Verification
    1. Ignition ON.
    Note: A slight delay may occur before the cooling
    fan activates.
    2. Verify the G10 Cooling Fan Motor activates in each
    available speed when commanding the cooling fan
    ON with a scan tool. The cooling fan speed should
    increase with each command.
    ⇒ The cooling fan does not activate or increase in
    speed as commanded
    Refer to Circuit/System Testing
    ⇓ The cooling fan activates and increases in
    speed as commanded
    3. Operate the vehicle within the Conditions for
    Running the DTC to verify the DTC does not reset.
    You may also operate the vehicle within the
    conditions that you observed from the Freeze
    Frame/Failure Records data.
    4. Verify the DTC does not set.
    ⇒ If the DTC sets
    Refer to Circuit/System Testing
    ⇓ If the DTC does not set
    5. All OK.
    Circuit/System Testing
    1. Ignition OFF, disconnect the harness connector X1
    at the G10 Cooling Fan.
    2. Ignition ON, verify that a test lamp illuminates
    between the B+ circuit terminal 2 and ground.
    ⇒ If the test lamp does not illuminate and the
    circuit fuse is good
    2.1. Ignition OFF, and all vehicle systems OFF, it
    may take up to 2 minutes for all vehicle
    systems to power down.
    2.2. Test for less than 2 Ω in the B+ circuit end
    to end.
    ⇒ If 2 Ω or greater, repair the open/high resistance
    in the circuit.
    ⇒ If less than 2 Ω, verify the fuse is not open and
    there is voltage at the fuse.
    ⇒ If the test lamp does not illuminate and the
    circuit fuse is open
    2.1. Ignition OFF, and all vehicle systems OFF, it
    may take up to 2 minutes for all vehicle
    systems to power down.
    2.2. Test for infinite resistance between the B+
    circuit and ground.
    ⇒ If less than infinite resistance, repair the short to
    ground in the circuit.
    ⇒ If infinite resistance, replace the
    G10 Cooling Fan.
    ⇓ If the test lamp illuminates
    Note: The cooling fan speed output circuit is
    pulled-up to a voltage within the ECM, 2-3 volts on
    the output circuit is normal.
    3. Connect a DMM, set on the diode setting, between
    the G10 Cooling Fan control circuit terminal 4 and
    ground.
    4. Verify the DMM reading is greater than 2.5 V or
    displays O.L. with the cooling fan
    commanded OFF.
    ⇒ If 2.5 V or less
    4.1. Ignition OFF, and all vehicle systems OFF, it
    may take up to 2 minutes for all vehicle
    systems to power down.
    4.2. Disconnect the harness connector X1 at the
    K20 Engine Control Module.
    4.3. Test for infinite resistance between the
    G10 Cooling Fan control circuit terminal 4 and
    ground.
    ⇒ If less than infinite resistance, repair the short to
    ground in the circuit.
    ⇒ If infinite resistance, replace the K20 Engine
    Control Module.
    ⇒ If greater than 2.5 V or displays O.L.
    5. Command the cooling fan ON to 90% with a
    scan tool.
    6. Verify the DMM reading is less than 1 V.
    ⇒ If 1 V or greater
    6.1. Ignition OFF.
    6.2. Disconnect the harness connector X1 at the
    K20 Engine Control Module, ignition ON.
    6.3. Test for less than 1 V between the
    G10 Cooling Fan control circuit terminal 4 and
    ground.
    ⇒ If 1 V or greater, repair the short to voltage on
    the circuit.
    ⇓ If less than 1 V.
    6.4. Ignition OFF, and all vehicle systems OFF, it
    may take up to 2 minutes for all vehicle
    systems to power down.
    6.5. Test for less than 2 Ω in the circuit end to end.
    ⇒ If 2 Ω or greater, repair the open in the circuit.
    ⇒ If less than 2 Ω, replace the K20 Engine Control
    Module.
    ⇓ If less than 1 V
    7. Replace the G10 Cooling Fan.

  19. #59
    Tuning Addict blindsquirrel's Avatar
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    "PWM EV" in the drop-down box is just a name given to a type of output signal. The PWM EV setting is used with both viscous and electric (brushless) fans.

    I have not seen anyone verify that they have been able to make a GM ECM control an aftermarket SPAL fan. Theoretically it should be possible, but that's all there is to go on.

    Trying to use factory diagnostics for a combination of parts the factory never used is a fool's errand. You will have to write up your own diagnostics to figure this out. If that sounds hard, maybe it would be easier to get a different fan that's known to work with the GM ECM, or get a controller that's known to work with the aftermarket SPAL fan.

  20. #60
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    Update, I repinned the Spal fan and have the factory harness signal going to the spal white wire. The hptuner tune is still at pwm ev and 100hz.... I did reverse the two "controlled by %" boxes: "Desired%" and "desired % vs AC" to:
    "85 80 80 70 70 55 55 43 43 43 37 24 18 18 18 18 18 18"

    Which is essentially reverse of the oem tune. The fan works according to the ECT scanner as it should. But I cant get the fan to turn on if I activate the AC or defroster. I can not tell if the pressure in the ac system is not high enough to activate the fan. And I was not smart enough to look at the scanner PID list to see if that was something that was in the list...