What fuses power the PCM and fuel pump relays on the 5.0L engine controls circuit?

Fuse U (20A, hot in start or run) feeds the PCM power diode, while fuses I and O (both 20A, hot at all times) in the engine compartment fuse box feed the PCM power relay and fuel pump relay via circuit 37 Y.

What wire color feeds the fuel pump from the fuel pump relay?

Circuit 238 DG/Y (dark green/yellow) exits the fuel pump relay when energized, passing through splice S139 and connector C202 to the inertia fuel shutoff (continued on page 24-8).

What are the MAF sensor wire circuits on this diagram?

The Mass Air Flow (MAF) sensor at connector C130 uses circuit 361 R for 12V relay-energized power, plus circuits 967 LB/R and 968 T/LB to the PCM.

Where are the PCM grounds located on this diagram?

Grounds shown are G100 (via 57 BK through S102, and 570 BK/Y — see Grounds page 10-1), G101 (via 570 BK/W — see Grounds page 10-3), and G104 (via 57 BK).

What does the PCM power relay control?

Per the diagram callout, it directs voltage to the PCM, fuel pump relay, and PCM related components; its 361 R output also feeds the MAF sensor and the E4OD/4R70W transmission circuits.

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Ford 5.0L Engine Controls Wiring Diagram 24-1 - PCM & Fuel Pump Relay (Bronco)

Ford 24-1 Engine Controls 5.0L wiring diagram with PCM power relay, mass air flow sensor and fuel pump relay

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Engine controls wiring diagram for 5.0L showing PCM power relay, mass air flow sensor and fuel pump relay circuits.

AI caption August 2018 · Photo 344 of 386

This document is page 24-1 of a Ford wiring diagram set covering Engine Controls for the 5.0L engine. It shows the power feed circuits from the Engine Compartment Fuse Box — fuse U (20A, hot in start or run) feeding the PCM power diode via circuit 16 R/LG and 175 BK/Y, and fuses I and O (both 20A, hot at all times) feeding circuit 37 Y to the PCM power relay and fuel pump relay. The PCM power relay output (circuit 361 R) branches at splice S136 to the Mass Air Flow (MAF) sensor (C130, wires 967 LB/R and 968 T/LB), to the E4OD transmission (page 30-2) or 4R70W transmission (page 29-3), and to C101 (pages 24-3, 24-4). The fuel pump relay output on 238 DG/Y runs through S139 and C202 to the inertia fuel shutoff (page 24-8), with 926 LB/O going to the VIP data link connector. Ground circuits 57 BK and 570 BK/W tie to G100, G101, and G104 through splices S102 and S106, with cross-references to Grounds pages 10-1 and 10-3. PCM connector pin numbers and VIP data link connector wires (209 W/P, 914 T/O, 915 PK/LB) are also shown.

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Frequently asked questions

What fuses power the PCM and fuel pump relays on the 5.0L engine controls circuit?: Fuse U (20A, hot in start or run) feeds the PCM power diode, while fuses I and O (both 20A, hot at all times) in the engine compartment fuse box feed the PCM power relay and fuel pump relay via circuit 37 Y.
What wire color feeds the fuel pump from the fuel pump relay?: Circuit 238 DG/Y (dark green/yellow) exits the fuel pump relay when energized, passing through splice S139 and connector C202 to the inertia fuel shutoff (continued on page 24-8).
What are the MAF sensor wire circuits on this diagram?: The Mass Air Flow (MAF) sensor at connector C130 uses circuit 361 R for 12V relay-energized power, plus circuits 967 LB/R and 968 T/LB to the PCM.
Where are the PCM grounds located on this diagram?: Grounds shown are G100 (via 57 BK through S102, and 570 BK/Y — see Grounds page 10-1), G101 (via 570 BK/W — see Grounds page 10-3), and G104 (via 57 BK).
What does the PCM power relay control?: Per the diagram callout, it directs voltage to the PCM, fuel pump relay, and PCM related components; its 361 R output also feeds the MAF sensor and the E4OD/4R70W transmission circuits.