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

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.