What engines does this EEC wiring diagram cover?

The page is titled Electronic Engine Control (EFI 5.0L, 5.8L, 7.5L) and includes notes distinguishing 5.0L & 5.8L under 8500# from 5.8L over 8500# & 7.5L applications.

What wire feeds power to the fuel injectors and EEC solenoids?

Circuit 361, a Red wire, from splice S154 through C115 and splice S172, feeds the fuel injectors, TAB solenoid, TAD solenoid, and EVR solenoid.

What circuit connects the EEC module to the Vehicle Speed Sensor?

Circuit 150 DG/W (dark green/white) runs from module pin 3 through splice S352, connectors C285 and C114 to the Vehicle Speed Sensor; its return is 57 BK to ground G801. Circuit 150 also branches to Speed Control on page 123.

What wire color goes to the Heated Exhaust Gas Oxygen Sensor (HEGO)?

Circuit 94 DG/P (dark green/purple) from module pin 29 through connectors C126 and C103 feeds the HEGO; a 57 BK ground and 298 P/O circuit are also shown, with a note 'NOT USED ON 5.0L' on one branch.

What circuits run to the TAB, TAD, and EGR solenoids?

The Thermactor Air Bypass (TAB) solenoid uses circuit 190 W/BK to module pin 51, the Thermactor Air Diverter (TAD) solenoid uses 200 W/BK to pin 11, and the EGR Vacuum Regulator (EVR) solenoid uses 360 DG through C112 to pin 33.

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1989 Ford Bronco EEC Wiring Diagram Pg 41 - EFI 5.0L 5.8L 7.5L Solenoids & HEGO

Electronic engine control wiring diagram page 41 with fuel injectors, thermactor and EGR solenoid circuits

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Wiring diagram showing fuel injector, thermactor air bypass/diverter, EGR vacuum regulator, and oxygen sensor circuits.

Part of 1987-1991 Ford Bronco Wiring Diagrams

AI caption February 2011 · Photo 453 of 1787

This is page 41 of a Ford factory wiring diagram set covering the Electronic Engine Control (EEC) system for EFI 5.0L, 5.8L, and 7.5L engines. The diagram traces power circuit 361 (Red) from splice S154 through connector C115 and splice S172 to the fuel injectors, Thermactor Air Bypass (TAB) solenoid, Thermactor Air Diverter (TAD) solenoid, and EGR Vacuum Regulator (EVR) solenoid. Return circuits (96 T/O, 95 T/R, 190 W/BK, 200 W/BK, 360 DG) run to numbered pins (57, 51, 11, 33) on the solid-state EEC module. The lower half shows module pins 29, 49, 20, 56, 36, 16, 4, 3, and 6 connecting to the Heated Exhaust Gas Oxygen Sensor (HEGO) via circuit 94 DG/P, grounds G710/G711/G801/G802, the Vehicle Speed Sensor via circuit 150 DG/W, ignition/start circuits (259 BK/O, 11 DGY, page 28), and speed control (page 123). Application notes distinguish 5.0L, 5.8L under/over 8500# GVW, and 7.5L variants (e.g., "NOT USED ON 5.0L"). Connectors (C103, C110, C112, C114, C126, C170, C285), splices, and wire colors are labeled throughout, making this useful for diagnosing EEC-IV sensor, solenoid, and injector wiring.

Applies to: Ford F-Series/Bronco EFI 5.0L/5.8L/7.5L, electronic engine control page 41 (year not printed) (factory). Matches this vehicle.

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Frequently asked questions

What engines does this EEC wiring diagram cover?: The page is titled Electronic Engine Control (EFI 5.0L, 5.8L, 7.5L) and includes notes distinguishing 5.0L & 5.8L under 8500# from 5.8L over 8500# & 7.5L applications.
What wire feeds power to the fuel injectors and EEC solenoids?: Circuit 361, a Red wire, from splice S154 through C115 and splice S172, feeds the fuel injectors, TAB solenoid, TAD solenoid, and EVR solenoid.
What circuit connects the EEC module to the Vehicle Speed Sensor?: Circuit 150 DG/W (dark green/white) runs from module pin 3 through splice S352, connectors C285 and C114 to the Vehicle Speed Sensor; its return is 57 BK to ground G801. Circuit 150 also branches to Speed Control on page 123.
What wire color goes to the Heated Exhaust Gas Oxygen Sensor (HEGO)?: Circuit 94 DG/P (dark green/purple) from module pin 29 through connectors C126 and C103 feeds the HEGO; a 57 BK ground and 298 P/O circuit are also shown, with a note 'NOT USED ON 5.0L' on one branch.
What circuits run to the TAB, TAD, and EGR solenoids?: The Thermactor Air Bypass (TAB) solenoid uses circuit 190 W/BK to module pin 51, the Thermactor Air Diverter (TAD) solenoid uses 200 W/BK to pin 11, and the EGR Vacuum Regulator (EVR) solenoid uses 360 DG through C112 to pin 33.