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Thread: 1227747 to 16197427 Conversion PCM Swap with Wiring Pinout Directions!

  1. #1
    EFI GearHead ! EagleMark's Avatar
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    1227747 to 16197427 Conversion PCM Swap with Wiring Pinout Directions!

    I stole this information from Dave W. Writeup on CK5
    http://coloradok5.com/forums/showthread.php?t=270253

    He also got information from Thirdgen.org to start and I think the origanal was written by Fast355
    http://www.thirdgen.org/techboard/tbi/4 ... g-tbi.html

    Since I'm wiring one up starting today I figured I post up here the one Dave has added notes to.
    dave w

    Notes and information on converting to a TBI PCM

    I have had multiple people ask about re-pinning their earlier TBI cars/trucks
    to use the latest PCM. So here is the result. Information regarding the swap.

    PCM Swap/Tuning Notes
    8746/6965/7747/299 to 427 Truck PCM (Car showed, Trucks VERY similar)

    Old Pin---New Pin-----Color---------Function
    A1--------F6----------GRN/WHT------Fuel Pump Relay Control
    A3--------F16---------DK GRN/YEL---Charcoal Canister Purge Solenoid *** Not used on 87 GMC W/454***
    A4--------E1----------GRY-------------EGR Control
    A5--------E6----------BRN/WHT------Service Engine Soon Light
    A6--------E15---------PNK/BLK-------Ignition Feed +12VDC
    A7--------(1*)--------TAN/BLK-------TCC/Shift Light *** Investigate***
    A8--------F9----------ORN-------------Serial Datastream
    A9--------A14--------WHT/BLK-------Diagnostic Test
    A10-------F13--------BRN-------------Vehicle Speed Signal ***Output Speed not from DRAC set***
    A11-------B3---------BLK--------------Sensor Ground
    A12-------A1---------BLK/WHT-------ECM Ground 1
    B1--------E16--------ORN-------------Battery +12VDC
    B2--------B12--------TAN/WHT-------Fuel Pump Signal
    B3--------A5---------BLK/RED--------EST Ref Low
    B5--------A4---------PPL/WHT--------EST Ref High
    B6--------?-----------PPL---------------VATS(2*) *** Not used on 87 GMC W/454***
    B7--------(3*)-------BLK---------------Knock Sensor *** Not used on 87 GMC W/454***
    B8--------E12--------LT BLUE---------A/C Clutch Signal ***GRN Not LT BLUE 87 GMC W/454***
    B10-------E5---------ORN/BLK--------Park/Neutral Switch ***Investigate***
    C1--------(4*)-------BLK/PNK---------A.I.R. Converter Solenoid *** Not used on 87 GMC W/454***
    C2--------E7---------BRN---------------A.I.R. Port Solenoid (Diverter in trucks) ***Investigate***
    C3--------A7---------LT GRN/BLK-----IAC "B" Low ***LT GRN-BLK on 87 GMC W/454*** --- A7 1995 7.4
    C4--------A8---------LT GRN/WHT----IAC "B" High ***C4 WHT EST SIGNAL on 87 GMC W/454*** F11 1995 7.4
    C5--------A3---------LT BLU/WHT-----IAC "A" High ***C5 LT GRN-WHT on 87 GMC W/454*** --- A8 1995 7.4
    C6--------A6---------LT BLU/BLK------IAC "A" Low ***C6 LT BLU-WHT 87 GMC W/454*** --- A3 1995 7.4
    C7--------(5*)-------LT BLU------------High Gear Switch (In Auto Trans) ***C7 LT BLU-BLK on 87 GMC W/454*** --- A6 1995 7.4
    C8--------(6*)-------LT BLU------------Power Steering Pressure Switch ***Not used on 87 GMC W/454***
    C9--------(7*)-------PPL/WHT---------Crank Signal
    C10-------B8--------YEL----------------Coolant Temperature Signal
    C11-------B13-------LT GRN-----------MAP Signal
    C12-------B9--------Tan----------------MAT Signal(8*) *** Not used on 87 GMC W/454*** ***ALSO NOT SHOWN ON DIAGRAMS BELOW***
    C13-------A15-------DK BLUE---------TPS Signal
    C14-------E14-------GRY---------------5 Volt Reference
    C15/D14--A9--------DRK GRN--------Injector "2" Control *** D14 on 87 GMC W/454***
    C16------E13--------Orange-----------Battery (Inputed in place of Brake Switchfor TCC to function)
    D1-------A2----------BLK/WHT--------ECM Ground 2 *** TAN-WHT on 87 GMC W/454***
    D2-------B4----------PPL---------------MAP Sensor Ground
    D4-------F11--------WHT--------------EST Signal
    D5-------B2---------TAN/BLK---------EST Bypass
    D6-------A12--------TAN--------------O2 Sensor Ground
    D7-------A10--------PPL---------------02 Sensor Signal
    D15/D16--A16-----DK BLUE---------Injector "1" Control ***D16 on 87 GMC W/454***
    none ---- F8 -------unknown---------For Power steering switch input. (gregs78cam post 10)

    Swap Notes
    *** Throttle Kicker Enable disabled***
    *** Initiate Integral with Calibration Const. Not Running enabled ***
    (1*)= Use E2 for a shift light on a manual transmission or E11 for the TCC onan Automatic
    (2*)= Supported by the PCM if optioned in the Prom on an UNKNOWN pin
    (3*)= A.) Wire like 1995 P30 Step Van, ESC Module output to B7
    (3*)= B.) Wire like 1995 C10 Truck, Bypass ESC (Blue to Brown) and useLate TBI/TPI 305/350 Knock sensor
    (4*)= Air injection into converter not used on trucks, but PCM has severalother un-used outputs (Tuning Valve, Idle Kicker)
    (5*)= Not Used by PCM (I like to leave the small connector in place and pinin unused wires)
    (6*)= Supported by PCM if optioned in the Prom on an UNKNOWN pin(1994-1995 2.2 S10 Wiring Diagram anyone?)
    (7*)= Not used by PCM, Remove 3 amp "CRANK" fuse from fuse box andstore in small connector)
    (8*)= Supported by the PCM, but functionality will need to be enabled in theProm6965 ONLY- Will have a NC relay that the computer grounds to shut-off theA/C compressor when the engine is heavily loaded. The A/C will work eitherby removing the wire all-togather, or connecting it to pin E3 (A/C Cut-Off orCPI Tuning Valve output)

    I would also like to mention that the orange Serial Data wire needs to berelocated from the top row, Pin "E" to the lower row, Pin "M". You will alsoneed to scan the vehicle like a 1993-1995 G-Series Van, C-Series Truck,S-Series Blazer, etc with Auto transmission.

    Finally, this is a trick Haulin@$$ taught me, if you have a wideband and arelooking to get real-time AFR put into the datastream, hook the 0-5 volt signalinto pin B16 (Linear EGR pintle position feedback). With some adaption to theALDL Definition being used to decode the reading, you can get an AFR
    reading of 10-20:1 or so.
    Attached Images Attached Images
    Last edited by dave w; 12-05-2011 at 09:30 PM.

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

  2. #2
    EFI GearHead ! EagleMark's Avatar
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    Re: 7747 RIP ECM to 427 PCM Swap with Wiring Pinout Directi

    Wiring Diagrams for the 16197427 and 16197395

    [attachment=0:q15r09ib]427-1.gif[/attachment:q15r09ib]

    [attachment=1:q15r09ib]427-2.gif[/attachment:q15r09ib]

    [attachment=2:q15r09ib]427-3.gif[/attachment:q15r09ib]
    Attached Images Attached Images

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

  3. #3
    EFI GearHead ! EagleMark's Avatar
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    Re: 7747 RIP ECM to 427 PCM Swap with Wiring Pinout Directi

    Does anyone know how the shift light works on a manaul from pin A7 (7747) to E2 (427)? Is it set to come on at certain RPM?

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

  4. #4
    Fuel Injected! 1leg's Avatar
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    Would this swap be very similer if you used the 8625 PCM.
    1993 RCSB 1/2, 350/4l60 Eaton locker 3.42-1. Drag truck ET 10.84 1/8mile. Build Thread
    1989 V2500 Suburban 350/th400, 4.11 gears, Tow truck, needs TBI 454 swap. Build Thread

  5. #5
    EFI GearHead ! EagleMark's Avatar
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    Quote Originally Posted by 1leg View Post
    Would this swap be very similer if you used the 8625 PCM.
    Yup. Basically same PCM $OD, $OE, $E6, $31.
    http://www.gearhead-efi.com/Fuel-Inj...Information-E6

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

  6. #6
    Vintage Methane Ejector
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    Quote Originally Posted by EagleMark View Post
    Does anyone know how the shift light works on a manaul from pin A7 (7747) to E2 (427)? Is it set to come on at certain RPM?
    With the 427 it will come on at a certain RPM + a whole bunch of other parameters.

  7. #7
    EFI GearHead ! EagleMark's Avatar
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    I had forgot about this, harness was done months ago, going in truck Thursday so I have time to wire this in!

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

  8. #8
    Fuel Injected! one92rs's Avatar
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    so does anyone know the pin in the 427 for the power steering pressure switch?

  9. #9
    Fuel Injected! 1leg's Avatar
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    What bin would you start with on 350 and th400 trans and 4-11 gears when doing this swap. yep just bought a 427.
    1993 RCSB 1/2, 350/4l60 Eaton locker 3.42-1. Drag truck ET 10.84 1/8mile. Build Thread
    1989 V2500 Suburban 350/th400, 4.11 gears, Tow truck, needs TBI 454 swap. Build Thread

  10. #10
    Fuel Injected! gregs78cam's Avatar
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    I have been looking for it for about a half hour now, I can tell you the PCM sees the input at IAC Mode Word #2, L4E86 bit 1.

    From thirdgen from MarcusMandarino

    "Fast355

    I found the info about PSPS on Chilton's, page 6-60, 2.2L > F8

    Marcus"

    EagleMark EDIT: none ---- F8 -------unknown---------For Power steering switch input. (greags78cam post 10)
    added to chart.
    Last edited by gregs78cam; 02-07-2012 at 09:04 PM.
    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

  11. #11
    Fuel Injected! gregs78cam's Avatar
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    Might try this, and just uncheck TCC only. But you would need to set up something for the kickdown. I think dave w had something figured out in the .bin to use a PCM output to kickdown. Try a search.
    Attached Files Attached Files
    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

  12. #12
    Vintage Methane Ejector
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    Quote Originally Posted by gregs78cam View Post
    I have been looking for it for about a half hour now, I can tell you the PCM sees the input at IAC Mode Word #2, L4E86 bit 1.

    From thirdgen from MarcusMandarino

    "Fast355

    I found the info about PSPS on Chilton's, page 6-60, 2.2L > F8

    Marcus"
    I've always been skeptical of that answer, since that pin is used with 4wd, so I just order a 1994 GM service manual. Should have a answer in a couple weeks.

  13. #13
    Fuel Injected! gregs78cam's Avatar
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    AAHHHH. I would test it if I had a way. What does the switch put through on this wire?
    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

  14. #14
    EFI GearHead ! EagleMark's Avatar
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    Quote Originally Posted by gregs78cam View Post
    AAHHHH. I would test it if I had a way. What does the switch put through on this wire?
    I don't know but I have one that works and shows when in use in adx on my LT1.

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

  15. #15
    Vintage Methane Ejector
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    Got the new book in today, and F8 is the correct pin for the power steering switch. Also, fount out that B1 is for the DIS system used with the 2.2L. It is called the 1X Signal, and is used for ASDF (Alternate Synchronous Double Fire).

    Anyone ever find the VATS pin? I'll trade you the AC High Pressure Switch pin. This was used to raise the idle if the A/C pressure got too high (no bins that I know of with this active).
    Last edited by 93V8S10; 02-13-2012 at 08:13 PM.

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