1987 Ford LTD Crown Victoria Wiring Diagram - Engine Compartment & Underdash

This document is a scanned wiring diagram page from Mitchell Repair Information Company (© 2003, printed February 13, 2004), titled 'Fig. 3: Engine Compartment (Cont.) & Underdash' for the 1987 Ford LTD Crown Victoria. It covers the engine compartment and underdash wiring, centered on the Microprocessor Control Unit (MCU) for the 5.8L carbureted engine, showing all 24 connector pins with their wire color codes (e.g., DK GRN-PPL, GRY-YEL, TAN-RED). Components diagrammed include the thermactor dump timer, thermactor control and dump relays, heated O2 sensor, manifold absolute pressure switch, coolant hi/lo switch, knock sensor, mid engine temp switch, Duraspark ignition module, distributor, ignition coil, throttle kicker solenoid and relay, carb actuator stepper motor, zoned vacuum switches, self-test connector, canister purge solenoid, thermactor air diverter (TAD) and air bypass (TAB) solenoids, choke heater, oil pressure switch, compressor and vent solenoid with solid-state compressor relay, height sensor, and an 11-pin level control module (rear air suspension) with pin functions such as high signal, +5V power, ignition power, battery power, comp control, and vent control. Fuse references include Fuse #18, Fuse #8, and Fuse #5, plus resistance wires (7 Ω and 1.1 Ω) and fusible links. A reader can trace wire colors and circuit paths for these systems.