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Thread: 12200411 set up for 700R4

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  1. #1
    EFI GearHead ! EagleMark's Avatar
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    12200411 set up for 700R4

    I'd like some help in setting up a 12200411 LS1B PCM for 700R4. I've done this before but forgot what I had to do? This one is a little more complicated by VSS that is an 8. So need to calculate that for proper speed which is needed for the TCC operation.

    Yes I know someone would do it for me, but that's not what I'm looking for. Looking for the knowledge to do it correctly and understand changes needed. This one will be done in EFI Live and the RoadRunner.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  2. #2
    Fuel Injected!
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    Hi Mark,

    Post the base tune you will be beginning from (in *.tun format) and I will work through the changes with you. I should have time to reply back and forth with you this weekend ...

  3. #3
    EFI GearHead ! EagleMark's Avatar
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    Thanks Buzz! This should be a good lesson!

    Truck should be here tomorrow for the weekend so I can read it.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  4. #4
    Super Moderator dave w's Avatar
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    I'm wondering if the 700R4 has been modified? I've worked with a few 700R4's that had some internal wiring modifications done to allow a manual toggle switch to lock up the torque converter.

    What I remember about OBD I 700R4 TCC control ... when the 4th gear switch closes a ground is sent to the ECM. The TCC solenoid gets power from the brake switch. When all programmed parameters are qualified (usually TPS / MPH), the ECM will apply a ground to the TCC solenoid.

    I'm thinking EFI Live can be programmed to 100% PWM Min / Max for TCC control. I'm thinking MPH can be programmed for TCC lock up. I'm thinking most LS1B wiring I've worked with have Red 42 as TCC control.

    dave w

  5. #5
    EFI GearHead ! EagleMark's Avatar
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    It's a stock 700R4 that came in the 1990 Blazer. Not sure what he did with the wiring yet? The only thing I did a few months back was remove VATS when he was installing the engine. It does run and drive.

    For the VSS, it's a Dakota digital 8k on NP208/700r4 adaptor.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  6. #6
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    i don't know if referring to full-size blazer or the S10 blazer, but in either case.... looks like the same diagram used between a 4.3 blazer S10 and a 5.7 full-size S10.

    can probably ignore the TH400 section.

    brake switch is wired in series with the TCC solenoid, so brake application should always disable TCC, otherwise some kind of trans issue exists and is keeping it engaged.

    the way the temp and 4th gear switches are setup in the other diagram are kind of confusing, but maybe there is some reasoning behind it? not enough digital inputs available to watch them seperately?

    http://imgur.com/f7drJku,4MzqsK8
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


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