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MS3base/V3.57 Hardware Manual Megasquirt-3 Product Range MS3 1.4.x Dated: 2016-11-13 Hardware manual covering specific wiring and configuration of your Megaquirt MS3/V357 ECU. This version of the documentation applies to: • MS3 on a V3.57 mainboard without MS3X as shown above running firmware MS3 1.4.x See the Setting Up manual for more detail on version numbers. Does not apply to other Megasquirt products or other firmware versions. (c) 2014-6 James Murray MS3base/V3.57 Hardware Guide Table of Chapters 1: Introduction.............................................................................................................................8 2: Megasquirt System Hardware..............................................................................................10 3: Wiring...................................................................................................................................12 4: Fuel System..........................................................................................................................61 5: Ignition System - fundamentals............................................................................................71 6: Ignition system - specific operating modes........................................................................109 7: Throttles..............................................................................................................................178 8: Optional Hardware.............................................................................................................179 9: Example wiring...................................................................................................................179 10: Further information...........................................................................................................181 11: Appendix A Schematics....................................................................................................181 12: Appendix B: junkyard guide to finding EDIS....................................................................193 13: Appendix C: V3.57 Board Setup / Jumpers.....................................................................198 14: Revision history................................................................................................................204 (c) 2014-6 James Murray 2016-11-13 Page 2/204 MS3base/V3.57 Hardware Guide Contents 1: Introduction.............................................................................................................................8 1.1 Emissions and disclaimer................................................................................................8 1.2 Required tools..................................................................................................................8 1.3 How to use this manual....................................................................................................8 1.4 Scope of advice without MS3X........................................................................................9 2: Megasquirt System Hardware..............................................................................................10 2.1 Overview........................................................................................................................10 2.2 Megasquirt Installation...................................................................................................10 2.3 Wiring Harness...............................................................................................................11 2.4 Crank / Cam Inputs........................................................................................................11 2.5 Sensor Inputs.................................................................................................................11 2.6 Outputs...........................................................................................................................11 2.7 Tuning interface..............................................................................................................11 3: Wiring...................................................................................................................................12 3.1 Best Practices................................................................................................................12 3.1.1 Wire and connector choice.....................................................................................12 3.1.2 Soldering or crimping..............................................................................................12 3.1.3 Re-pinning the DB37..............................................................................................12 3.1.4 Fusing.....................................................................................................................12 3.1.5 4-pin relay pin-out note...........................................................................................12 3.1.6 Relay and accessory power routing.......................................................................12 3.2 Grounding (Earthing) Schemes.....................................................................................13 3.2.1 Reasoning for sensor grounding............................................................................13 3.2.2 Reasoning for Megasquirt grounding.....................................................................14 3.3 Core Wiring Diagram......................................................................................................14 3.3.1 Optional Connections.............................................................................................15 3.3.2 Additional internal inputs/outputs............................................................................15 3.3.3 Relay Board............................................................................................................21 3.4 Inputs..............................................................................................................................23 3.4.1 Crank and Cam Tach inputs...................................................................................23 3.4.2 MAP (Manifold Absolute Pressure) sensor.............................................................23 3.4.3 IAT/MAT (Intake/Manifold Air Temperature) sensor................................................24 3.4.4 CLT (Coolant Temperature) sensor........................................................................27 3.4.5 TPS (Throttle Position Sensor)...............................................................................28 3.4.6 O2 (Oxygen) Sensor / Lambda Sensor..................................................................28 3.4.7 MAF (Mass Air Flow) Sensor..................................................................................30 3.4.8 Flex / Switch input...................................................................................................36 3.4.9 Spare Analog (ADC) inputs.....................................................................................37 3.4.10 Switch inputs.........................................................................................................38 3.4.11 B/LD boot jumper..................................................................................................39 3.4.12 CAN comms..........................................................................................................40 3.4.13 Knock sensor........................................................................................................41 3.4.14 Speed sensor inputs.............................................................................................42 3.4.15 EGT input..............................................................................................................43 (c) 2014-6 James Murray 2016-11-13 Page 3/204 MS3base/V3.57 Hardware Guide 3.5 Outputs...........................................................................................................................44 3.5.1 Fuel Injector outputs...............................................................................................44 3.5.2 Ignition outputs.......................................................................................................44 3.5.3 Fuel pump output....................................................................................................44 3.5.4 Idle valve.................................................................................................................45 3.5.5 Tacho output..........................................................................................................48 3.5.6 Other relay outputs.................................................................................................49 3.5.7 Boost control output................................................................................................50 3.5.8 Alternator control wiring..........................................................................................50 3.6 Bench test wiring............................................................................................................59 3.6.1 Minimal connection.................................................................................................60 3.6.2 JimStim connection.................................................................................................60 4: Fuel System..........................................................................................................................61

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