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MS3X/V3.0 Hardware Manual Megasquirt-3 Product Range MS3 1.4.X Dated: 2016-11-13

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MS3X/V3.0 Hardware Manual Megasquirt-3 Product Range MS3 1.4.X Dated: 2016-11-13 MS3X/V3.0 Hardware Manual Megasquirt-3 Product Range MS3 1.4.x Dated: 2016-11-13 Hardware manual covering specific wiring and configuration of your Megaquirt MS3X/V30 ECU. This version of the documentation applies to: • MS3 on a V3.0 mainboard with 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 MS3X/V3.0 Hardware Guide Table of Chapters 1: Introduction.............................................................................................................................8 2: Megasquirt System Hardware..............................................................................................10 3: Wiring...................................................................................................................................12 4: Fuel System..........................................................................................................................65 5: Ignition System - fundamentals............................................................................................78 6: Ignition system - specific operating modes........................................................................114 7: Throttles..............................................................................................................................186 8: Optional Hardware.............................................................................................................187 9: Example wiring...................................................................................................................187 10: Further information...........................................................................................................195 11: Appendix A Schematics....................................................................................................196 12: Appendix B: junkyard guide to finding EDIS....................................................................212 13: Appendix C: V3.0 Board Assembly..................................................................................217 14: Revision history................................................................................................................240 (c) 2014-6 James Murray 2016-11-13 Page 2/240 MS3X/V3.0 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 with 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 3.3 Core Wiring Diagram......................................................................................................14 3.3.1 Connectors..............................................................................................................14 3.3.2 Optional Connections.............................................................................................15 3.3.3 Additional internal inputs/outputs............................................................................15 3.3.4 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...................................................................................................35 3.4.9 Spare Analog (ADC) inputs.....................................................................................36 3.4.10 Switch inputs.........................................................................................................36 3.4.11 B/LD boot jumper..................................................................................................37 3.4.12 CAN comms..........................................................................................................38 3.4.13 Knock sensor........................................................................................................39 3.4.14 Realtime clock......................................................................................................41 3.4.15 PT4 input / output.................................................................................................42 3.4.16 Speed sensor inputs.............................................................................................42 (c) 2014-6 James Murray 2016-11-13 Page 3/240 MS3X/V3.0 Hardware Guide 3.4.17 EGT input..............................................................................................................42 3.5 Outputs...........................................................................................................................43 3.5.1 Fuel Injector outputs...............................................................................................43 3.5.2 Ignition outputs.......................................................................................................44 3.5.3 Fuel pump output....................................................................................................44 3.5.4 Idle valve.................................................................................................................44 3.5.5 Tacho output...........................................................................................................50 3.5.6 Mid current PWM / relay output..............................................................................50 3.5.7 Alternator control wiring..........................................................................................52 3.6 Bench test wiring............................................................................................................61 3.6.1 Minimal connection.................................................................................................62 3.6.2 JimStim connection.................................................................................................62 3.6.3 V10 and V12 support (DIY mods)...........................................................................62
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