What wire colors go to the fuel injectors?

All eight injectors have a RED feed wire; the ECM-side wires alternate TAN (injectors 1, 4, 5, 8) and WHT (injectors 2, 3, 6, 7).

What powers the EEC system?

Two 'hot at all times' feeds via Fuse Link N and Fuse Link W (both YEL wires), plus Fuse 5, a 15A hot-in-run circuit feeding PPL/ORG wiring.

What wire colors are used for the fuel pump circuit?

The fuel pump relay is fed by YEL and outputs LT BLU/ORG; the inertia fuel shut-off uses DK GRN/YEL in and RED/YEL out, then RED and BRN/WHT through the tank select switch to the fuel pumps, with ORG wires to ground (BLK).

Which circuits apply only to E4OD-equipped vehicles?

The 'to brake switch' circuit (LT GRN) and the 'to transmission system' circuit are marked E4OD only; the power steering pressure switch is labeled for 5.0L without E4OD.

What is the note about single-tank models?

The tank select switch diagram states a jumper is used on 1-tank models in place of the front/rear tank select switch.

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Ford Bronco 5.0L EEC-IV Engine Control Wiring Diagram - EFI, Sensors & Pinout

Ford EEC electronic engine control wiring diagram with color-coded circuits and fuel injectors

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Wiring diagram of the Ford electronic engine control (EEC) system showing fuel injectors, sensors, and color-coded circuit routing.

AI caption July 2008 · Photo 455 of 460

This document is a Ford EEC-IV (Electronic Engine Control) wiring schematic for a fuel-injected V8 (eight fuel injectors shown), uploaded to a 1988 Ford Bronco gallery. It maps every circuit into and out of the Electronic Engine Control Module, listing pin numbers (e.g., 52, 42, 19, 38, 53, 41, 32, 55 for the automatic transmission controls, plus two full rows of ECM pins 1–60) and wire color codes such as RED/LT GRN, TAN/YEL, DK GRN/YEL, GRY/RED, and PNK/ORG. Components covered include the ignition switch, EEC power relay, TFI ignition module, ignition coil and spark plugs, ignition suppression resistor, fuel pump relay, inertia fuel shut-off, dual-tank select switch and fuel pumps, idle air bypass valve, canister purge solenoid, thermactor air diverter and bypass solenoids, EGR control solenoid and EGR valve position sensor, knock sensor, heated oxygen sensor, power steering pressure switch (5.0L without E4OD), throttle position sensor, MAP sensor, intake air and engine coolant temperature sensors, and vehicle speed sensor. Power feeds come from fuse links N and W (hot at all times) and Fuse 5, a 15A hot-in-run circuit. Notes reference E4OD-only circuits, the VIP test connector, and a jumper used on single-tank models, making this useful for diagnosing EFI, ignition, and fuel pump wiring.

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Frequently asked questions

What wire colors go to the fuel injectors?: All eight injectors have a RED feed wire; the ECM-side wires alternate TAN (injectors 1, 4, 5, 8) and WHT (injectors 2, 3, 6, 7).
What powers the EEC system?: Two 'hot at all times' feeds via Fuse Link N and Fuse Link W (both YEL wires), plus Fuse 5, a 15A hot-in-run circuit feeding PPL/ORG wiring.
What wire colors are used for the fuel pump circuit?: The fuel pump relay is fed by YEL and outputs LT BLU/ORG; the inertia fuel shut-off uses DK GRN/YEL in and RED/YEL out, then RED and BRN/WHT through the tank select switch to the fuel pumps, with ORG wires to ground (BLK).
Which circuits apply only to E4OD-equipped vehicles?: The 'to brake switch' circuit (LT GRN) and the 'to transmission system' circuit are marked E4OD only; the power steering pressure switch is labeled for 5.0L without E4OD.
What is the note about single-tank models?: The tank select switch diagram states a jumper is used on 1-tank models in place of the front/rear tank select switch.