What fuses power the PCM and fuel pump on a 1994 Bronco/F-Series 5.0L?

Three 20A fuses in the engine compartment fuse box: fuse U (hot in start or run) feeds the PCM power diode circuit, fuse I (hot at all times) feeds the PCM power relay, and fuse O (hot at all times) feeds the fuel pump relay.

What wire color is the PCM power relay output on the 1994 5.0L?

When the PCM power relay is energized, its output is circuit 361, a red (R) wire, which feeds the mass air flow sensor, transmission, and other components through splice S136.

Which circuit goes to the inertia fuel shutoff switch?

Circuit 238 DG/Y (dark green/yellow) from the fuel pump relay routes through splice S139 and connector C202 to the inertia fuel shutoff, shown on page 24-8.

What are the mass air flow sensor wire colors on this diagram?

The MAF sensor at connector C130 receives 12V on circuit 361 R (relay energized) and uses signal circuits 967 LB/R and 968 T/LB.

Where are the PCM grounds shown for this circuit?

Circuit 57 BK grounds at G100 and G104, and circuit 570 BK/W grounds at G101 via splice S106. Ground details are cross-referenced to pages 10-1 and 10-3.

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1994 Ford Bronco/F-Series 5.0L Engine Controls Wiring Diagram - PCM & Fuel Pump

1994 Bronco/F-Series 5.0L engine controls wiring, PCM power and fuel pump relay (page 24-1)

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Ford 1994 Bronco/F-Series 5.0L engine-controls schematic (24-1): PCM power relay, fuel pump relay, mass air flow sensor, VIP data link and E4OD transmission feeds with circuit numbers and wire colors.

AI caption February 2007 · Photo 239 of 1902

This is page 24-1, "Engine Controls (5.0L)", from the 1994 Ford Bronco/F-Series wiring diagram manual. It shows the power supply portion of the engine control system: three 20-amp fuses (positions U, I, and O) in the engine compartment fuse box feed the PCM power circuit (circuit 16 R/LG through the PCM power diode to 175 BK/Y), the PCM power relay (circuit 37 Y in, 361 R out when energized), and the fuel pump relay (outputs 926 LB/O and 238 DG/Y). Circuit 361 R distributes switched 12V through splice S136 to the mass air flow sensor (connector C130, with signal circuits 967 LB/R and 968 T/LB), the E4OD/4R70W transmission (circuit 912 W/R, E4OD only), and connector C101. Circuit 238 DG/Y routes through S139 and C202 to the inertia fuel shutoff switch (page 24-8), while 926 LB/O goes to the VIP data link connector C198. PCM ground circuits 57 BK and 570 BK/W terminate at grounds G100, G101, and G104. PCM pin numbers are labeled, along with connectors C185, C198, C199, and cross-references to power distribution (page 13-5), grounds (pages 10-1, 10-3), and transmission diagrams (pages 29-3, 30-2). Footnotes distinguish wiring with and without E4OD/4R70W transmissions.

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Frequently asked questions

What fuses power the PCM and fuel pump on a 1994 Bronco/F-Series 5.0L?: Three 20A fuses in the engine compartment fuse box: fuse U (hot in start or run) feeds the PCM power diode circuit, fuse I (hot at all times) feeds the PCM power relay, and fuse O (hot at all times) feeds the fuel pump relay.
What wire color is the PCM power relay output on the 1994 5.0L?: When the PCM power relay is energized, its output is circuit 361, a red (R) wire, which feeds the mass air flow sensor, transmission, and other components through splice S136.
Which circuit goes to the inertia fuel shutoff switch?: Circuit 238 DG/Y (dark green/yellow) from the fuel pump relay routes through splice S139 and connector C202 to the inertia fuel shutoff, shown on page 24-8.
What are the mass air flow sensor wire colors on this diagram?: The MAF sensor at connector C130 receives 12V on circuit 361 R (relay energized) and uses signal circuits 967 LB/R and 968 T/LB.
Where are the PCM grounds shown for this circuit?: Circuit 57 BK grounds at G100 and G104, and circuit 570 BK/W grounds at G101 via splice S106. Ground details are cross-referenced to pages 10-1 and 10-3.