What fuses power the PCM and fuel pump relay circuits on the 5.8L California engine?

Three 20A fuses in the Engine Compartment Fuse Box: one on a 'Hot in Start or Run' feed and two on 'Hot at All Times' feeds, powering the PCM Power Diode, PCM Power Relay, and Fuel Pump Relay.

What does the PCM Power Relay do?

It directs voltage to the PCM, fuel pump relay, and PCM related components; its output is circuit 361 R at 12V when the relay is energized.

What wire goes to the inertia fuel shutoff switch?

Circuit 238 DG/Y (dark green/yellow) runs through connectors C202M/C202F to the inertia fuel shutoff, shown on page 25-12.

What are the MAF sensor wire circuits shown?

The Mass Air Flow sensor at connector C130 uses circuits 361 R (power), 967 LB/R, and 968 T/LB.

Where do the PCM grounds go?

Ground circuits 57 BK and 570 BK/W run through splice S106 and connector C185 to grounds G100 and G101 (see grounds pages 10-1 and 10-2).

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Ford 5.8L California Engine Controls Wiring Diagram - PCM & Fuel Pump Relay 25-7

Ford 5.8L California engine controls wiring diagram page 25-7, PCM power relay and fuel pump circuits

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Wiring diagram of 5.8L California engine controls showing PCM power relay, fuel pump relay, and EVAP canister purge circuits with wire color codes.

AI caption June 2019 · Photo 381 of 386

This document is page 25-7 of a Ford factory-style wiring diagram set, covering Engine Controls for the 5.8L engine with California emissions. It shows the power distribution and control circuits for the Powertrain Control Module (PCM). Power flows from three 20A fuses in the Engine Compartment Fuse Box (fed 'Hot in Start or Run' and 'Hot at All Times') through the PCM Power Diode (circuit 16 R/LG to 175 BK/Y), the PCM Power Relay, and the Fuel Pump Relay. The diagram traces wire circuits with colors and numbers, including 361 R (12V relay energized), 37 Y, 926 LB/O to the Data Link Connector (DLC), 238 DG/Y to the Inertia Fuel Shutoff (page 25-12), 57 BK and 570 BK/W grounds to G100 and G101, and connections to the Mass Air Flow (MAF) sensor (967 LB/R, 968 T/LB), EVAP Canister Purge Valve (191 LG/BK), and E4OD transmission (page 50-2). PCM connector pins 1, 8, 9, 11, 22, 37, 40, 50, 57, and 60 are labeled. Explanatory callouts describe the functions of the PCM, MAF sensor, EVAP purge system, and the relays. Cross-references point to Power Distribution (page 13-5), Grounds (pages 10-1, 10-2), and connector C101 (page 25-8).

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Frequently asked questions

What fuses power the PCM and fuel pump relay circuits on the 5.8L California engine?: Three 20A fuses in the Engine Compartment Fuse Box: one on a 'Hot in Start or Run' feed and two on 'Hot at All Times' feeds, powering the PCM Power Diode, PCM Power Relay, and Fuel Pump Relay.
What does the PCM Power Relay do?: It directs voltage to the PCM, fuel pump relay, and PCM related components; its output is circuit 361 R at 12V when the relay is energized.
What wire goes to the inertia fuel shutoff switch?: Circuit 238 DG/Y (dark green/yellow) runs through connectors C202M/C202F to the inertia fuel shutoff, shown on page 25-12.
What are the MAF sensor wire circuits shown?: The Mass Air Flow sensor at connector C130 uses circuits 361 R (power), 967 LB/R, and 968 T/LB.
Where do the PCM grounds go?: Ground circuits 57 BK and 570 BK/W run through splice S106 and connector C185 to grounds G100 and G101 (see grounds pages 10-1 and 10-2).