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Thread: E-fan controlling on 02 Chevy truck

  1. #11
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    Quote Originally Posted by Aloicious View Post
    you may be right, but I thought someone over on PPE added the sensor to an Xvan tune (which is switch controlled), and it worked, at least for the fans....so I'm wondering if he can leave his current AC setup alone, and just add the sensor for the fans (assuming the sensor would be recognized, but I'm thinking it might be) instead of trying to change over the AC control to the Fbody style....

    its a thought at least..
    Hhmmm, Maybe so. That would be easy enough to try out. Just install the sensor and see if it works.

    Aaron, I am looking into your wiring right now.

    Jeff
    98 GMC RCSB 2WD, Internally stock 305 w/Twin T-3 junkyard Turbos,4L80e,Ramjet intake,42lb.inj., 0411PCM, COS3,4675LBS w/me in it. Best Time on 5 passes-13.01@110

  2. #12
    Lifetime Member Aloicious's Avatar
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    this is the thread I was thinking about, with Robby running the A/C sensor....thats why I'm thinking it might work because I know we're running fbody based tunes for our 24x setups, but he isn't, so that makes me think that even if the vehicle is setup for different A/C control, it may still recognize the pressure sensor input, at least for fan control and logging if nothing else....(at least on the same 12212156 OS, which a 2002 truck should be on)
    http://www.pacificp.com/forum/viewto...ghlight=sensor
    1996 c1500 gen1e 5.7L - the "LS31", 24x CNP, LS2 coils, modified T56, 12200411PCM running COS3, zz4 cam, custom MPFI, etc. coming soon: Twin Turbos

  3. #13
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    Actually, Robby sent me his non COS3 tune and I changed that parameter for him. Then he converted it to COS3. At least, that is how I remember it---It has been a while. It would still be easy enough to check the other way.

    Jeff
    98 GMC RCSB 2WD, Internally stock 305 w/Twin T-3 junkyard Turbos,4L80e,Ramjet intake,42lb.inj., 0411PCM, COS3,4675LBS w/me in it. Best Time on 5 passes-13.01@110

  4. #14
    Lifetime Member Aloicious's Avatar
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    you changed the A/C parameter?

    yeah, someone will probably just have to install one and see if it works...
    1996 c1500 gen1e 5.7L - the "LS31", 24x CNP, LS2 coils, modified T56, 12200411PCM running COS3, zz4 cam, custom MPFI, etc. coming soon: Twin Turbos

  5. #15
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    I did a lot of bench testing on this about a month ago...
    - 12200411 PCM
    - 24x signal generator
    - 0-5V A/C pressure sensor
    - 12V LEDs as indicators for fan 1, fan 2, and A/C relay control
    - EFILive
    - TunerCat OBDII

    No matter what I did with calibration settings, I was unable to begin with a truck calibration, change the A/C system type, and have proper fan control. If I remember correctly, I was able to get fan 1 (low speed) to turn on, but I could never get fan 2 (high speed) to turn on.

    Now I was able to do an F-Body segment swap into the truck calibration to get the fans to work properly.

    As an additional trick, I was able to wire in an 80K ohm, 1/4 watt, resistor across A/C pressure sensor 5V ref (pin 45 BLUE PCM) and signal (pin 14, RED PCM). To fake out the A/C pressure signal requirement.
    24x LS1 PCM on Early Small-Block Chevy and LT1/LT4
    http://www.eficonnection.com

  6. #16
    Lifetime Member Aloicious's Avatar
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    hmm...so you were able to get the A/C sensor to read a pressure at the PCM on a non-fbody based tune with the addition of the resistors?
    1996 c1500 gen1e 5.7L - the "LS31", 24x CNP, LS2 coils, modified T56, 12200411PCM running COS3, zz4 cam, custom MPFI, etc. coming soon: Twin Turbos

  7. #17
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    Quote Originally Posted by Aloicious View Post
    hmm...so you were able to get the A/C sensor to read a pressure at the PCM on a non-fbody based tune with the addition of the resistors?
    That's not what I'm saying. I don't recall, using the resistor, if the A/C Pressure PID displayed a value when using the truck calibraiton (I don't see why it wouldn't).
    24x LS1 PCM on Early Small-Block Chevy and LT1/LT4
    http://www.eficonnection.com

  8. #18
    Lifetime Member Aloicious's Avatar
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    oh, okay, so you were just faking the signal from a sensor with the resistor. gotcha...
    1996 c1500 gen1e 5.7L - the "LS31", 24x CNP, LS2 coils, modified T56, 12200411PCM running COS3, zz4 cam, custom MPFI, etc. coming soon: Twin Turbos

  9. #19
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    Wow you guys were reading my mind and I haven't even been keeping up with this tread. I was going to test my factory tune and I also did 02 F-body tune and segment swap all my 5.3 and trans setting into.
    2006 Trailblazer SS
    Twin Turbo 67 Chevy Truck
    SOLD Truck 2002 Chevy kb turbo t70 5.7l

  10. #20
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    Quote Originally Posted by S10Wildside View Post
    I did a lot of bench testing on this about a month ago...
    - 12200411 PCM
    - 24x signal generator
    - 0-5V A/C pressure sensor
    - 12V LEDs as indicators for fan 1, fan 2, and A/C relay control
    - EFILive
    - TunerCat OBDII

    No matter what I did with calibration settings, I was unable to begin with a truck calibration, change the A/C system type, and have proper fan control. If I remember correctly, I was able to get fan 1 (low speed) to turn on, but I could never get fan 2 (high speed) to turn on.

    Now I was able to do an F-Body segment swap into the truck calibration to get the fans to work properly.

    As an additional trick, I was able to wire in an 80K ohm, 1/4 watt, resistor across A/C pressure sensor 5V ref (pin 45 BLUE PCM) and signal (pin 14, RED PCM). To fake out the A/C pressure signal requirement.
    S10Wildside,
    Can you tell me what you segment from the f-body tune into the truck calibration to get the fans to work properly.
    thanks for the help.

    The truck calibration didn't work but it was reading the voltage on the sensor.

    change the A/C system type, in Tunercat worked. "Thanks to Lextech"
    2006 Trailblazer SS
    Twin Turbo 67 Chevy Truck
    SOLD Truck 2002 Chevy kb turbo t70 5.7l

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