MegaSquirt EEC-IV Adaptor Board Schematic - Ford 60-Pin Piggyback Wiring

This document is an electronic schematic for a "Megasquirt EEC-IV adaptor board," Rev 1.21, drawn by Scott Hall and dated 03/24/2006 (contact [email protected]), Page 1 of 1. It shows how a MegaSquirt engine management system connects to a Ford EEC-IV 60-pin ECU connector via a piggyback adaptor board. The drawing details three main connectors: the MegaSquirt DB37 connector with signals such as FP, SPOUT, INJ1/INJ2, IAC1A/IAC2B, PWM IN, 12VPWR, SVREF, PIP, TPS, CLT, IAT and spare pins; a transmission feed-through connector (noted as "Modified for Dustin's Lightning") carrying E4OD-type signals like BOO, VSS+/-, SS1, SS2, EPC, TCC, MLPS, CCS, OD light, OD SW, TOT; and the Ford EEC-IV 60-pin connector (J1) mapping injector outputs INJ1-INJ8, HEGO/EGO-R/EGO-L, MAF, KNOCK, OCTANE and other signals. Support circuitry includes a Second EGO Input (R9 1K, R10 1M, C1.22uF), a Nitrous Feedback circuit with a 2n2222A transistor, a table switching/knock input circuit, three auxiliary drivers using ZTX450 transistors, and a TIP120-based PWM/SPOUT driver with a note that R4=330 ohms to 12V for TFI ignition or 2.2k ohms to 5V for EDIS. Useful for anyone wiring MegaSquirt to a Ford EEC-IV harness.