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Thread: LS2 Fan Logic or lack thereof?

  1. #41
    Senior Tuner
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    Jun 2005
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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.
    RWTD
    True Custom Tuning & Performance Parts Specialists!
    Custom Tuning: dynotune@rwtd.com

    Toys: '08 C6 LS3 / '03 SVT Cobra / '08 Harley Davidson Nightrod Special / '11 Chevy Duramax

  2. #42
    Potential Tuner
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    Dec 2006
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    5
    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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    Dec 2015
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    7
    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
    Tuner in Training
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    Sep 2012
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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
    Advanced Tuner
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    Oct 2013
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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
    Tuner
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    Sep 2015
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    Santa Rosa, CA
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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
    Potential Tuner
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    Jul 2017
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    hello Friends , How to set the appropriate value for the fan ?

  8. #48

  9. #49
    Potential Tuner
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    Jul 2016
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    2
    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
    Advanced Tuner
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    Apr 2017
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    Meridian MS
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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.