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Thread: Converting from 7747 to 7427 - does anyone have the pinouts in PLAIN TEXT?

  1. #1
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    Converting from 7747 to 7427 - does anyone have the pinouts in PLAIN TEXT?

    So I've done a few 7747 swaps and now feel comfortable enough to try out the 7427.

    All I really need is the Moates G1 adapter right? I already have the APU1 burner.

    Does anyone have the wiring pinouts for a 7427 in PLAIN TEXT (IE not a pic, but in plain text?)

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    Fuel Injected! TINBENDER59's Avatar
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    do you have both wiring diagrams? if so I can work it from there.

    PM me

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    Quote Originally Posted by TINBENDER59 View Post
    do you have both wiring diagrams? if so I can work it from there.

    PM me
    both are here

    http://www.gearhead-efi.com/Fuel-Inj...out-Directions!

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    Quote Originally Posted by Blake View Post
    So I've done a few 7747 swaps and now feel comfortable enough to try out the 7427.

    All I really need is the Moates G1 adapter right? I already have the APU1 burner.

    Does anyone have the wiring pinouts for a 7427 in PLAIN TEXT (IE not a pic, but in plain text?)
    Here is the post I created years ago on TGO regarding the swap.

    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
    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
    A8--------F9----------ORN------------Serial Datastream
    A9--------A14---------WHT/BLK-------Diagnostic Test
    A10-------F13---------BRN------------Vehicle Speed Signal
    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*)
    B7--------(3*)---------BLK-------------Knock Sensor
    B8--------E12---------LT BLUE--------A/C Clutch Signal
    B10-------E5----------ORN/BLK--------Park/Neutral Switch

    C1--------(4*)-------BLK/PNK---------A.I.R. Converter Solenoid
    C2--------E7---------BRN-------------A.I.R. Port Solenoid (Diverter in trucks)
    C3--------A7---------LT GRN/BLK------IAC "B" Low
    C4--------A8---------LT GRN/WHT-----IAC "B" High
    C5--------A3---------LT BLU/WHT-----IAC "A" High
    C6--------A6---------LT BLU/BLK------IAC "A" Low
    C7--------(5*)-------LT BLU-----------High Gear Switch (In Auto Trans)
    C8--------(6*)-------LT BLU-----------Power Steering Pressure Switch
    C9--------(7*)-------PPL/WHT---------Crank Signal
    C10-------B8---------YEL--------------Coolant Temperature Signal
    C11-------B13--------LT GRN----------MAP Signal
    C12-------B9---------Tan-------------MAT Signal(8*)
    C13-------A15--------DK BLUE--------TPS Signal
    C14-------E14--------GRY------------5 Volt Reference
    C15/D14--A9---------DRK GRN--------Injector "2" Control
    C16------E13--------Orange----------Battery (Inputed in place of Brake Switch for TCC to function)

    D1-------A2---------BLK/WHT--------ECM Ground 2
    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

    Swap Notes

    (1*)= Use E2 for a shift light on a manual transmission or E10 for the TCC on an 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 use Late TBI/TPI 305/350 Knock sensor
    (4*)= Air injection into converter not used on trucks, but PCM has several other un-used outputs (Tuning Valve, Idle Kicker)
    (5*)= Not Used by PCM (I like to leave the small connector in place and pin in 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 and store in small connector)
    (8*)= Supported by the PCM, but functionality will need to be enabled in the Prom

    6965 ONLY- Will have a NC relay that the computer grounds to shut-off the A/C compressor when the engine is heavily loaded. The A/C will work either by removing the wire all-togather, or connecting it to pin E3 (A/C Cut-Off or CPI Tuning Valve output)

    I would also like to mention that the orange Serial Data wire needs to be relocated from the top row, Pin "E" to the lower row, Pin "M". You will also need 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 are looking to get real-time AFR put into the datastream, hook the 0-5 volt signal into pin B16 (Linear EGR pintle position feedback). With some adaption to the ALDL Definition being used to decode the reading, you can get an AFR reading of 10-20:1 or so.

  5. #5
    Fuel Injected! TINBENDER59's Avatar
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    Fast355 you da Man!!!

  6. #6
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    thanks!

    I'm actually swapping an entirely new harness in, so starting from scratch. Do you mind if I share that pinout on other sites?

    So all I need is the G1 adapter, zif socket and sf512 chip?

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