What ECU pins are shown on this page?

Pins 23 through 54, with signal assignments listed in four columns comparing two configurations plus transmission-related pins.

Which pins are noted as 302 engine only?

Pin 23 (KS) is marked '302 only' in both engine columns, and pin 24 (PSPS) is marked '302 only'.

Where does the MAF sensor signal connect according to this chart?

MAF is shown on pin 50 in the MAF-column (highlighted blue), while the SD column shows MAP on pin 45 (highlighted red).

Which pin carries the Data Bus (+) signal and for what years?

Pin 28 is labeled 'Data Bus (+) 91-95' in the first column.

What transmission-related signals are listed?

MLPS (pin 30), OD light (pin 32), EPC (pin 38), OD switch (pin 41), TOT (pins 42/49), 4LOW input (pin 42), SS1 (pins 51/52), SS2 (pin 52), and TCC (pin 53).

Home/ Registry/ Ford/ Bronco/ 1987-1991/ “Eddie Bauer”/ Photo supermotors.net/registry/media/899376

Ford Bronco SD to MAF EEC Pin-Out Chart Pins 23-54 - Speed Density Conversion

Ford computer EEC pin-out reference table with highlighted pins, rows 23-54

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Color-highlighted EEC computer pin-out reference table listing signal assignments for pins 23 through 54.

AI caption December 2011 · Photo 957 of 1799

This document is one page of a multi-page EEC computer pin-out comparison table, apparently created to support a Speed Density (SD) to Mass Air Flow (MAF) EFI conversion on a Ford truck. The table lists ECU connector pins 23 through 54 across four columns—two engine-management columns (SD vs. MAF) and two transmission-related columns. For each pin it identifies the signal name, such as ACT, V-REF, EVP, NDS, CANP, TAB, TAD, EVR, SPOUT, V-PWR, INJ 3, INJ 4, GND, HEGO, MAP, MAF, SIG-RTN, TPS, STI, HEGO GND, MLPS, OD light, OD switch, EPC, TOT, 4LOW input, SS1, SS2 and TCC. Color highlighting distinguishes pins that differ between the two systems: red-highlighted cells (e.g., PSPS 302 only, Data Bus (+) 91-95, HEGO, CANP, MAP, HEGO GND, TAB, TOT, SS1) appear in one column, while blue-highlighted cells (e.g., TAB, TAD, INJ 4, INJ 3, HEGO, MAF, 4LOW input, TOT, SS1, SS2) appear in the other, showing which pins move or change function. Notes indicate some pins apply to the 302 engine only (KS, PSPS) and Data Bus (+) applies to 1991-95. Column headers are on another page of the set.

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Frequently asked questions

What ECU pins are shown on this page?: Pins 23 through 54, with signal assignments listed in four columns comparing two configurations plus transmission-related pins.
Which pins are noted as 302 engine only?: Pin 23 (KS) is marked '302 only' in both engine columns, and pin 24 (PSPS) is marked '302 only'.
Where does the MAF sensor signal connect according to this chart?: MAF is shown on pin 50 in the MAF-column (highlighted blue), while the SD column shows MAP on pin 45 (highlighted red).
Which pin carries the Data Bus (+) signal and for what years?: Pin 28 is labeled 'Data Bus (+) 91-95' in the first column.
What transmission-related signals are listed?: MLPS (pin 30), OD light (pin 32), EPC (pin 38), OD switch (pin 41), TOT (pins 42/49), 4LOW input (pin 42), SS1 (pins 51/52), SS2 (pin 52), and TCC (pin 53).