1986-95 Ford V8 Truck Speed Density EFI Wiring Schematic - EEC-IV Pinout

This document is a color-coded EFI wiring schematic for 1986-95 Ford speed-density V8 trucks, produced by RJM Injection Technologies (fordfuelinjection.com, copyright 2004). It shows the EEC-IV engine control system's sensor and actuator connectors along with their corresponding EEC processor pin numbers. Sensors depicted include the Engine Coolant Temp (ECT, pin 7), Air Charge Temp (ACT, pin 25), Throttle Position Sensor (TPS, pin 47), Manifold Absolute Pressure (MAP, pin 45), Vehicle Speed Sensor (VSS, pins 3 and 6), and Exhaust Oxygen (HEGO, pin 29). Shared signal wiring is shown: SIG RTN (pin 46), VREF (pin 26), and NDS (pin 30, noted as auto trans only, with a ground path for manual trans). Fuel pump monitor (FPM, pin 8), Air Bypass valve (ISC, pin 21), self-test connectors (STO/MIL pin 17, STI pin 48), and the Check Engine Light (MIL) are also included. Injector banks are grouped: cylinders 1, 4, 5, 8 on INJ 58 and cylinders 2, 3, 6, 7 on INJ 59. Grounds are listed as CASE GND 20, PWR GND 40, HEGO GND 49, and PWR GND 60, with battery power routed through the EFI relay to EEC VPWR pins 37 and 57. Connector shapes/pin layouts are illustrated for each component.