94 Bronco 5.8 lost power to the PCM cause the fuse is blown

[Broncoguy88]

My dad and I just swapped a 5.0 in his 94 Bronco out of a 93 F-150. He was driving it home the other night & it just died. Upon inspection I have concluded the the fuse blew for the Distributor pickup, ignition cool, the PCM & the TFI module does anyone have any idea why this happened? Cause when that fuse went it shut off the PCM which shut down the fuel pump.

 

[miesk5]

Yo B

Was it fuse "i" in;

cab fuse panel, if soon what number is it?

or in Power Distribution Box (PDB)in engine bay? If it was fuse i (eye), then that provides power to the PCM Power Relay.

Or "U", it provides battery power to PCM POWER RELAY COIL?

PDB Diagram @ http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=43832

Or Fuse 13 in cab fuse panel, Blown, Stop & Hazard Lamps, Stop Sensor for Anti-Lock Brakes (ABS) Speed Control & PCM; Short Circuits, Common Locations TSB 95-02-11 for 94-95 Bronco & F Series; wire harness may be pinched/shorted on steering column support behind the dash where the 14401 wire assy may come in contact w/a sharp edge on dash panel wall, I had same short here too & caused E4OD's TCIL (OD switch-LED) to blink like a friggin pia; wires pinched @ brake/tail lights, my 96's stop/turn/tail lights wires were almost cut in half on passenger side against 1/4 panel (inner); wires pinched @ high mount brake light where the wires short on sheet metal;

& @ driver's left hand seat belt anchor bolt @ base of B Pillar. Source: by Ford

In cab fuse panel diagram @

EEC IV (PCM) wiring diagram, includes PDB FUSE i to PCM Power Relay to THE PCM, Pins 37 and 57, both are for V-PWR (Vehicle Power), that provides supply voltage (regulated 10-14 volts) within the PCM

@ http://www.fuelinjectedford.com/files/bronco_1995_25-01.gif

EEC IV PIN LEGEND @

http://web.archive.org/web/20120118104425/http://www.oldfuelinjection.com/truckpinouts.html

EEC IV PIN DIAGRAM @

http://web.archive.org/web/20120115055623im_/http://www.oldfuelinjection.com/images/eec04.gif

One possible short that pops PDB FUSE i is at the Canister Purge Solenoid (CANP) wiring harness that shorts out on the exhaust manifold or EGR TUBE.

CANP Location pic in a 93 5.8

Source: by Bbronco311 @

Passenger side near throttle body

pic by SEATTLEFSB

EDIT!!

ADDING FOLLOWING;

Inpected the PCM connector IN ENGINE BAY, ENSURE IT AND WIRES ARE OK.

Driver's Side B Pillar pic; "...This is a picture of the connector behind the driver side seat belt retractor. This is a common area of problems. On mine, the wires had corroded and fell out of the connector..."



by jem270

 

[Broncoguy88]

It was fuse 22 in the PDB box under the hood

 

[miesk5]

Yo,

Look at the diagram again, there is no fuse 22.

Pick it out using the diagram

I can't open the Diagram and type using my Tablet and because I can't post the pic of it here

 

[miesk5]

Yo

Is it fuse U in PDB?

Wiring Diagram in a 94 from EVTM, partial; from **** Fuse U in Power Distribution Box (PDB) through PCM Power Relay Coil & **** Fuse O in PDB through FP Relay to Inertia Fuel Cut-Off Switch (IFS)

Source: by Mikey350 at

 

[miesk5]

Yo,

I have a physical therapist coming in a few minutes, so I will be back on line after noon estate.

Meanwhile let me know if you can open following wiring diagrams;

http://www.revbase.com/BBBMotor/Wd/Results?Year=1994&Make=54&Model=633&Engine=5.0&WdSystem=15&WdSubsystem=922

http://www.supermotors.net/registry/23082/77071

Looking for battery to fusible link to PDB diagram.

 

[miesk5]

Yo,

Let me revise my last statement, we need the wiring diagram showing battery to fusible link to PDB & ignition switch.

Usual suspects are;

Bad Fusible Link ... most fusible links have melted/charred insulation when they burn out

Ignition switch ... can test the switch for continuity if needed.

Fusible Link Location pics in an 85 & 89 the first two pics are of an 89 5.0. because of the loom i wasnt able to trace the wires...The second pic is at the starter relay to show you a fusible link wire (the green wire in my fingers you can see at the eyelet there is a black plastic block). the third pic is of my 85. i think that big block is another style fusible link ford used on older stuff (but im not sure)..."

Source: by shift1313 (Matt) @ http://broncozone.com/topic/15953-no-spark/page-2