What pin is the VSS on a 1987-95 Ford truck computer?

VSS (+) is on pin 3 and VSS (-) is on pin 6 for both Speed Density and Mass Air computers, including E4OD versions.

Which pins are the extra injectors on the 94-95 Mass Air truck computer?

INJ 6 is pin 12, INJ 7 is pin 13, INJ 8 is pin 14, and INJ 5 is pin 15 on the 94-95 302/351 Mass Air computer.

Where is the MAF return signal on the Mass Air computer?

MAF-RTN is on pin 9 of the 94-95 302/351 Mass Air computer. On the 87-95 Speed Density computer, pin 9 is Data Bus (-) for 90-95.

What E4OD-specific pins are added on 89-95 trucks?

E4OD additions include BOO on pin 2 (both Speed Density and Mass Air), 4LOW input on pin 12 and SS2 on pin 19 (Speed Density column).

What injector size does this chart list for 302/351 truck computers?

Both the 87-95 Speed Density and 94-95 Mass Air 302/351 computers are listed with 19 lb/Hr injectors.

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Ford Truck/Van/Bronco 87-95 EEC-IV Computer Pinout Chart - SD & Mass Air

Ford truck computer EEC pin-out reference table, pins 1-28

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Reference table listing Ford truck EEC computer pin-out assignments by year, engine, and pin number for pins 1-28.

AI caption October 2011 · Photo 901 of 1799

This document is a reference chart titled "Truck Computer Pin outs" comparing EEC-IV computer (ECU/PCM) connector pin assignments for Ford Truck, Van, and Bronco vehicles with 302/351 engines. It compares four columns: 1987-95 Speed Density computers, 1994-95 Mass Air computers (both using 19 lb/hr injectors), and 1989-95 E4OD transmission additions for both Speed Density and Mass Air types. The chart lists pins 1 through 28, showing signal assignments such as Keep Alive Power (pin 1), VSS (+) on pin 3 and VSS (-) on pin 6, IDM (pin 4), ECT (pin 7), FPM (pin 8), MAF-RTN (pin 9 on Mass Air), A/C on (pin 10), TAD vs CANP (pin 11), injectors 5-8 on pins 12-15 (Mass Air only, highlighted), IGN-GND (16), STO (17), Data Bus (+/-) (18/19 Mass Air; 9 and 28 on Speed Density for certain years), GND (20), IAB (21), FPR (22), KS (23, 302 only), PSPS (24, 302 only, Speed Density), ACT (25), V-REF (26), and EVP (27). E4OD-specific pins include BOO (pin 2), 4LOW input (pin 12), and SS2 (pin 19). This chart is useful for Speed Density to Mass Air conversion wiring on Ford trucks.

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Frequently asked questions

What pin is the VSS on a 1987-95 Ford truck computer?: VSS (+) is on pin 3 and VSS (-) is on pin 6 for both Speed Density and Mass Air computers, including E4OD versions.
Which pins are the extra injectors on the 94-95 Mass Air truck computer?: INJ 6 is pin 12, INJ 7 is pin 13, INJ 8 is pin 14, and INJ 5 is pin 15 on the 94-95 302/351 Mass Air computer.
Where is the MAF return signal on the Mass Air computer?: MAF-RTN is on pin 9 of the 94-95 302/351 Mass Air computer. On the 87-95 Speed Density computer, pin 9 is Data Bus (-) for 90-95.
What E4OD-specific pins are added on 89-95 trucks?: E4OD additions include BOO on pin 2 (both Speed Density and Mass Air), 4LOW input on pin 12 and SS2 on pin 19 (Speed Density column).
What injector size does this chart list for 302/351 truck computers?: Both the 87-95 Speed Density and 94-95 Mass Air 302/351 computers are listed with 19 lb/Hr injectors.