Ford EEC engine control module pinout reference charts

'85-96 Bronco & F150 (gasoline smallblock) EEC Pinouts
IF THE IMAGE IS TOO SMALL, click it.
ERROR: '95 pin 54 should say "WOT A/C Relay (CA 4.9L)", & '96 pin 69 should say "WOT A/C Relay (4.9L)"
For trucks under 8500GVWR: '85-93 EECs use a maximum of 49 pins; '94 uses 55 at most (adding 6 for sequential injectors & 1 for OSS, but losing PSP); '95 uses 57 at most (adding HEGO12 & WOTAC); '96 uses 65 at most (adding PTO, a ground pin, MD & return, HEGO21, & 3 HEGOV monitors).

'93-95 Lightnings use the '84-93 non-MAF pinout.

The '96 V8 "Customer Use" pin #4 (323 LB/Y) is for a PTO indicator light circuit to change EEC strategies & self-diagnostics for stationary hi-RPM use.
https://fordbbas.com/non-html/1997/c24_25_p.pdf
POWER TAKE-OFF CIRCUIT INSTALLATIONS REQUIRES:
1) VOLTAGE WHEN PTO IS OPERATING
2) VOLTAGE OFF WHEN PTO IS OFF, OR WHEN IGNITION IS OFF
3) PCM / PTO CIRCUIT MUST BE ELECTRICALLY ISOLATED FROM THE SOLENOID, OR PCM DAMAGE COULD RESULT
1. Splice circuit 640, R/Y, located on the driver side under the instrument panel, labeled "Power Take-Off Circuit," to the body builder installed wire that connects to the positive side of the PTO indicator switch or PTO control relay.
2. Splice circuit 323, LB/Y, located on the driver side underhood, labeled "Power Take-Off Circuit," to the body builder-installed wire that connects to the positive (Switched) side of the PTO indicator light.
Failure to properly connect this wire may result in erroneous emissions codes and illumination of the "Check Engine" light during PTO operation.
In electrically actuated systems, the wire labeled "Power Take-Off Circuit," must be isolated from the solenoid or PCM DAMAGE COULD RESULT.

See also:
. . . . . . . .
http://www.bbbind.com/free_tsb.html (E-mail req'd but not checked; switch to WIRING DIAGRAMS)

For '79 & similar trucks, see:
https://www.supermotors.net/registry/24302/78593-2

Owner caption October 2011 · Photo 3947 of 5000