Ford EEC Wiring Diagram - 8 Cyl SFI Sensor Circuits (1986 Mustang, Page 109)

This page (109) is a factory-style wiring diagram titled "Electronic Engine Control (8 CYL SFI)," covering the sensor input circuits of the EEC system on a V8 sequential fuel injection engine. It shows how the Electronic Control Assembly (ECA) connects to five sensors: the EGR valve position sensor, throttle position sensor, manifold absolute pressure (MAP) sensor, engine coolant temperature sensor, and manifold charge temperature sensor. Each circuit is labeled with its circuit number and wire color: 351 O/W is the shared reference voltage feed distributed through splices S152 and S130; sensor signal wires are 352 BR/LG (EGR position, ECA pin 27), 355 DG/LG (throttle position, pin 47), 356 DB/LG (MAP, pin 45), 354 LG/Y (coolant temperature, pin 7), and 357 LG/P (manifold charge temperature, pin 25). Circuit 359 BK/W is the common signal return/ground, tying together at splices S151, S150, and S132 and passing through connectors C1984 and C190. Two EEC TEST diagnostic connector legs are shown: circuit 209 W/R to C1985 from ECA pin 48, and circuit 382 Y/BK to C1984 from ECA pin 17. Connector C191 appears in several circuits as a bulkhead/inline connector. The diagram is useful for tracing EEC sensor wiring, pin numbers, and wire colors.