7747 ECM and 7427 PCM wiring pinouts in plain text

[AwesomeJ10]

I finally found the pin outs in plain text for 7747 ECM and 7427 PCM

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.

[jaber]

Thanks Blake...