1989 Ford Bronco EEC Wiring Diagram Pg 43 - EFI 5.0L 5.8L 7.5L Test Connectors
Reference · 1987-1991 BroncoAll 175 wiring diagrams
Wiring diagram showing 4WD indicator switch, self-test/VIP connectors, and warning-indicator circuits for the EEC module.
Part of 1987-1991 Ford Bronco Wiring Diagrams
This is page 43 of a Ford factory-style wiring diagram set covering the Electronic Engine Control (EEC) system for EFI 5.0L, 5.8L, and 7.5L engines. The diagram shows several circuits connecting to the EEC module (drawn as a dashed box with numbered pins 12, 30, 18, 10, 48, and 17). Circuit 784 LB/BK runs from the 4-wheel drive indicator switch (closed in LOW) through connectors C124, C114, splice S125, and C100 to EEC pin 12, with a branch to the electronic shift circuit (page 83). Circuit 481 GY/Y runs from start/ignition (page 29) through C100 to pin 30, noted 'NOT FOR E4OD TRANS.' Pin 18 (circuit 223 T/LG) feeds the inferred mileage sensor (page 74) for 5.8L under-8500 GVW 49-state, high altitude, and Canada calibrations. Pin 10 (347 BK/Y) goes to the A/C heater control (page 129). Pin 48 (100 W/R) goes to the C171 self test connector (STI), and pin 17 (658 PK/LG) goes to the C168 VIP test connector and, via C100, to warning indicators (page 74). Insets detail the C171 self test connector and the C168 VIP test connector pinout (359 BK/W, 97 T/LG, 658 PK/LG).
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Frequently asked questions
- What wire goes to EEC pin 48 and where does it lead?
- Circuit 100 W/R goes from EEC pin 48 through connector C171 to the Self Test Connector (STI).
- What are the wires at the C168 VIP test connector?
- The C168 VIP test connector inset shows three wires: 359 BK/W, 97 T/LG, and 658 PK/LG. Circuit 658 PK/LG connects to EEC pin 17 and also runs through C100 to the warning indicators (page 74).
- What circuit connects the 4-wheel drive indicator switch to the EEC module?
- Circuit 784 LB/BK, which is closed in LOW, runs through connectors C124, C114, splice S125, and C100 to EEC pin 12, with a branch to the electronic shift circuit shown on page 83.
- Which applications use the inferred mileage sensor on this diagram?
- The inferred mileage sensor (circuit 223 T/LG at EEC pin 18, detailed on page 74) applies to the 5.8L under 8500 GVW with 49-state, high altitude, and Canada calibrations.
- Does the 481 GY/Y start/ignition circuit apply to E4OD transmissions?
- No. The diagram notes that circuit 481 GY/Y to EEC pin 30 is 'NOT FOR E4OD TRANS.'
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