BMW 3 Series E46 M3 2001–2006 (S54) → Speeduino Speeduino v0.4 (auto)
BMW 3 Series E46 M3 2001–2006 (S54) — Speeduino — Speeduino
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-11
Before you start
Not confident with automotive wiring? Have a professional harness builder or tuner do it, or check your work before first power-up. A wiring mistake can damage the ECU, the engine or the car, or start a fire.
| Status | draft · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | 10: read the Findings page before cutting any wire |
| Size of the job | 49 wires · 9 connectors · 1 part lines |
| Tools | Crimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink |
| Order of work | 1. Check every part against the parts list. 2. Cut and label every wire (labels: Export → Wire labels). 3. Crimp and pin connector by connector, ticking the build checklist. 4. Run the bench test with nothing plugged in and the battery disconnected. 5. Only then connect the ECU and power up. |
Build checklist
Tick each box as you go. Continuity: meter from end to end, expect under 1 Ω.
| Wire | From | To | Gauge | Colour | Cut | Label | Crimp A | Crimp B | Pin A | Pin B | Continuity |
|---|---|---|---|---|---|---|---|---|---|---|---|
| W1 | OEM-X60001-4 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-X60001-5 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-X60001-6 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-X60001-9 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-X60005-5 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | SP-GND-1 | SPEEDUINO-A-10 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-GND-1 | SPEEDUINO-A-9 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-X60003-15 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-X60003-35 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-X60003-36 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-X60003-37 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-X60003-45 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-X60003-49 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-X60004-12 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-X60004-7 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-0V-1 | SPEEDUINO-A-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | SP-0V-1 | SPEEDUINO-A-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-X60004-14 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-X60004-9 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | SP-5V1-1 | SPEEDUINO-A-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-X60003-3 | SPEEDUINO-A-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-X60003-30 | SPEEDUINO-A-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-X60003-29 | SPEEDUINO-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-X60005-6 | SPEEDUINO-A-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-X60005-7 | SPEEDUINO-A-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-X60005-4 | SPEEDUINO-A-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-X60005-8 | SPEEDUINO-A-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-X60003-13 | SPEEDUINO-A-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-X60003-6 | SPEEDUINO-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-X60003-26 | SPEEDUINO-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-X60003-7 | SPEEDUINO-A-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-X60003-11 | SPEEDUINO-A-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-X60003-8 | SPEEDUINO-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-X60003-42 | SPEEDUINO-A-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-X60003-43 | SPEEDUINO-A-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-X60003-22 | SPEEDUINO-A-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-X60003-23 | SPEEDUINO-A-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-X60001-1 | SPEEDUINO-A-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-X60002-23 | SPEEDUINO-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-X60004-10 | SPEEDUINO-A-36 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-X60002-1 | SPEEDUINO-A-35 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-X60002-12 | SPEEDUINO-A-37 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-X60002-2 | SPEEDUINO-A-38 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-X60003-32 | SPEEDUINO-A-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-X60002-14 | SPEEDUINO-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-X60003-28 | SPEEDUINO-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-X60003-27 | SPEEDUINO-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-X60003-16 | SPEEDUINO-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-X60003-50 | SPEEDUINO-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ |
Bench test (before first power-up)
Battery disconnected, ECU and every sensor unplugged. Meter on resistance. Each pair below must read open (OL): a reading means a pinched wire, a stray strand or a mis-pinned cavity. Then check continuity of every wire (last column of the build checklist).
| # | Probe A | Probe B | Expect | Why | Reading |
|---|---|---|---|---|---|
| 1 | SPEEDUINO-A-10 | SPEEDUINO-A-13 | open (OL) | power ground must not touch 5 V sensor reference | |
| 2 | SPEEDUINO-A-12 | SPEEDUINO-A-13 | open (OL) | sensor ground must not touch 5 V sensor reference |
If any reading doesn't match, stop and get help before powering up.
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
OEM-X60001
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injector relay control | — | W38 | — | 0.5 | SPEEDUINO-A-16 | — | — | — |
| 2 | DBW output-stage supply (P_DKSM+) | — | — | — | — | — | — | — | — |
| 4 | Power ground | — | W1 | — | 0.85 | SP-GND-1 | — | — | — |
| 5 | Power ground | — | W2 | — | 0.85 | SP-GND-1 | — | — | — |
| 6 | Power ground | — | W3 | — | 0.85 | SP-GND-1 | — | — | — |
| 7 | Battery constant (terminal 30) | — | — | — | — | — | — | — | — |
| 8 | ECU main power (terminal 87 via main relay) | — | — | — | — | — | — | — | — |
| 9 | DBW output-stage return (P_DKSM-) | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
OEM-X60002
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | O2 sensor heater, front 1 (pre-cat) | — | W41 | — | 0.5 | SPEEDUINO-A-35 | — | — | — |
| 12 | O2 sensor heater, rear 2 (post-cat) | — | W42 | — | 0.5 | SPEEDUINO-A-37 | — | — | — |
| 14 | O2 sensor signal, rear 2 (post-cat) | — | W45 | — | 0.5 | SPEEDUINO-A-21 | — | — | — |
| 16 | O2 sensor signal, rear 1 (post-cat) | — | — | — | — | — | — | — | — |
| 2 | O2 sensor heater, front 2 (pre-cat) | — | W43 | — | 0.5 | SPEEDUINO-A-38 | — | — | — |
| 23 | Main relay control | — | W39 | — | 0.5 | SPEEDUINO-A-15 | — | — | — |
| 6 | O2 sensor heater, rear 1 (post-cat) | — | — | — | — | — | — | — | — |
OEM-X60003
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Mass air flow (MAF) signal | — | — | — | — | — | — | — | — |
| 10 | VANOS intake solenoid | — | — | — | — | — | — | — | — |
| 11 | Injector cylinder 5 | — | W32 | — | 0.5 | SPEEDUINO-A-1 | — | — | — |
| 12 | Map-controlled thermostat | — | — | — | — | — | — | — | — |
| 13 | Injector cylinder 1 | — | W28 | — | 0.5 | SPEEDUINO-A-1 | — | — | — |
| 15 | Throttle ground | — | W8 | — | 0.5 | SP-0V-1 | — | — | — |
| 16 | Oil pressure switch | — | W48 | — | 0.5 | SPEEDUINO-A-18 | — | — | — |
| 21 | Evap purge valve | — | — | — | — | — | — | — | — |
| 22 | Idle speed control, close | — | W36 | — | 0.5 | SPEEDUINO-A-29 | — | — | — |
| 23 | Idle speed control, open | — | W37 | — | 0.5 | SPEEDUINO-A-30 | — | — | — |
| 26 | Injector cylinder 3 | — | W30 | — | 0.5 | SPEEDUINO-A-3 | — | — | — |
| 27 | Intake air temperature (IAT) | — | W47 | — | 0.5 | SPEEDUINO-A-20 | — | — | — |
| 28 | Engine coolant temperature (ECT) | — | W46 | — | 0.5 | SPEEDUINO-A-19 | — | — | — |
| 29 | Intake camshaft position | — | W23 | — | 0.5 | SPEEDUINO-A-26 | — | — | — |
| 3 | Crankshaft position | — | W21 | — | 0.5 | SPEEDUINO-A-25 | — | — | — |
| 30 | Exhaust camshaft position | — | W22 | — | 0.5 | SPEEDUINO-A-24 | — | — | — |
| 31 | Throttle position sensor 2 | — | — | — | — | — | — | — | — |
| 32 | Throttle position sensor 1 | — | W44 | — | 0.5 | SPEEDUINO-A-22 | — | — | — |
| 33 | Knock sensor 1 | — | — | — | — | — | — | — | — |
| 34 | Knock sensor 2 | — | — | — | — | — | — | — | — |
| 35 | ECT ground | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| 36 | Intake camshaft ground | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 37 | Crankshaft ground | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 4 | MAF supply | — | — | — | — | — | — | — | — |
| 42 | Throttle motor drive 1 (H-bridge) | — | W34 | — | 0.5 | SPEEDUINO-A-31 | — | — | — |
| 43 | Throttle motor drive 2 (H-bridge) | — | W35 | — | 0.5 | SPEEDUINO-A-32 | — | — | — |
| 44 | Engine oil temperature | — | — | — | — | — | — | — | — |
| 45 | Oil temperature ground | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 46 | Knock sensor 3 | — | — | — | — | — | — | — | — |
| 47 | Knock sensor 4 | — | — | — | — | — | — | — | — |
| 49 | Exhaust camshaft ground | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 5 | Throttle (EDK/ITB) supply | — | — | — | — | — | — | — | — |
| 50 | Oil level switch | — | W49 | — | 0.5 | SPEEDUINO-A-14 | — | — | — |
| 6 | Injector cylinder 2 | — | W29 | — | 0.5 | SPEEDUINO-A-2 | — | — | — |
| 7 | Injector cylinder 4 | — | W31 | — | 0.5 | SPEEDUINO-A-5 | — | — | — |
| 8 | Injector cylinder 6 | — | W33 | — | 0.5 | SPEEDUINO-A-2 | — | — | — |
| 9 | VANOS exhaust solenoid | — | — | — | — | — | — | — | — |
OEM-X60004
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 10 | Fuel pump relay control | — | W40 | — | 0.5 | SPEEDUINO-A-36 | — | — | — |
| 12 | Pedal ground 2 | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 13 | Pedal position signal 2 | — | — | — | — | — | — | — | — |
| 14 | Pedal +5V supply 2 | — | W18 | — | 0.5 | SP-5V1-1 | — | — | — |
| 7 | Pedal ground 1 | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 8 | Pedal position signal 1 | — | — | — | — | — | — | — | — |
| 9 | Pedal +5V supply 1 | — | W19 | — | 0.5 | SP-5V1-1 | — | — | — |
OEM-X60005
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ignition coil 5 | — | — | — | — | — | — | — | — |
| 4 | Ignition coil 3 | — | W26 | — | 0.5 | SPEEDUINO-A-33 | — | — | — |
| 5 | Ignition ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 6 | Ignition coil 1 | — | W24 | — | 0.5 | SPEEDUINO-A-7 | — | — | — |
| 7 | Ignition coil 2 | — | W25 | — | 0.5 | SPEEDUINO-A-34 | — | — | — |
| 8 | Ignition coil 4 | — | W27 | — | 0.5 | SPEEDUINO-A-8 | — | — | — |
| 9 | Ignition coil 6 | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W8 | — | 0.5 | OEM-X60003-15 | — | — | — |
| 1 | — | — | W9 | — | 0.5 | OEM-X60003-35 | — | — | — |
| 1 | — | — | W10 | — | 0.5 | OEM-X60003-36 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-X60003-37 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-X60003-45 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-X60003-49 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | OEM-X60004-12 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | OEM-X60004-7 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | SPEEDUINO-A-12 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | SPEEDUINO-A-23 | — | — | — |
SP-5V1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W18 | — | 0.5 | OEM-X60004-14 | — | — | — |
| 1 | — | — | W19 | — | 0.5 | OEM-X60004-9 | — | — | — |
| 1 | — | — | W20 | — | 0.5 | SPEEDUINO-A-13 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-X60001-4 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-X60001-5 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | OEM-X60001-6 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | OEM-X60001-9 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-X60005-5 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | SPEEDUINO-A-10 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | SPEEDUINO-A-9 | — | — | — |
SPEEDUINO-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injector 1 | — | W28 | — | 0.5 | OEM-X60003-13 | — | — | — |
| 1 | Injector 1 | — | W32 | — | 0.5 | OEM-X60003-11 | — | — | — |
| 10 | Ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 11 | MAP sensor (0-5V) | — | — | — | — | — | — | — | — |
| 12 | Ground | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 13 | 5V | — | W20 | — | 0.5 | SP-5V1-1 | — | — | — |
| 14 | Proto area 1 (flex fuel) | — | W49 | — | 0.5 | OEM-X60003-50 | — | — | — |
| 15 | Proto area 2 (fan) | — | W39 | — | 0.5 | OEM-X60002-23 | — | — | — |
| 16 | Proto area 3 (fuel pump) | — | W38 | — | 0.5 | OEM-X60001-1 | — | — | — |
| 17 | Proto area 4 (tachometer) | — | — | — | — | — | — | — | — |
| 18 | Proto area 5 (clutch) | — | W48 | — | 0.5 | OEM-X60003-16 | — | — | — |
| 19 | Coolant temp (CLT) | — | W46 | — | 0.5 | OEM-X60003-28 | — | — | — |
| 2 | Injector 2 | — | W29 | — | 0.5 | OEM-X60003-6 | — | — | — |
| 2 | Injector 2 | — | W33 | — | 0.5 | OEM-X60003-8 | — | — | — |
| 20 | Inlet air temp (IAT) | — | W47 | — | 0.5 | OEM-X60003-27 | — | — | — |
| 21 | O2 sensor | — | W45 | — | 0.5 | OEM-X60002-14 | — | — | — |
| 22 | TPS input | — | W44 | — | 0.5 | OEM-X60003-32 | — | — | — |
| 23 | Ground | — | W17 | — | 0.5 | SP-0V-1 | — | — | — |
| 24 | Cam input / VR2+ | — | W22 | — | 0.5 | OEM-X60003-30 | — | — | — |
| 25 | Crank input / VR1+ | — | W21 | — | 0.5 | OEM-X60003-3 | — | — | — |
| 26 | VR2- | — | W23 | — | 0.5 | OEM-X60003-29 | — | — | — |
| 27 | VR1- | — | — | — | — | — | — | — | — |
| 28 | 5V | — | — | — | — | — | — | — | — |
| 29 | Idle stepper 2B | — | W36 | — | 0.5 | OEM-X60003-22 | — | — | — |
| 3 | Injector 3 | — | W30 | — | 0.5 | OEM-X60003-26 | — | — | — |
| 30 | Idle stepper 2A | — | W37 | — | 0.5 | OEM-X60003-23 | — | — | — |
| 31 | Idle stepper 1A | — | W34 | — | 0.5 | OEM-X60003-42 | — | — | — |
| 32 | Idle stepper 1B | — | W35 | — | 0.5 | OEM-X60003-43 | — | — | — |
| 33 | Ignition 3 | — | W26 | — | 0.5 | OEM-X60005-4 | — | — | — |
| 34 | Ignition 2 | — | W25 | — | 0.5 | OEM-X60005-7 | — | — | — |
| 35 | Boost | — | W41 | — | 0.5 | OEM-X60002-1 | — | — | — |
| 36 | Idle 2 (3-wire idle) | — | W40 | — | 0.5 | OEM-X60004-10 | — | — | — |
| 37 | PWM idle | — | W42 | — | 0.5 | OEM-X60002-12 | — | — | — |
| 38 | VVT | — | W43 | — | 0.5 | OEM-X60002-2 | — | — | — |
| 5 | Injector 4 | — | W31 | — | 0.5 | OEM-X60003-7 | — | — | — |
| 7 | Ignition 1 | — | W24 | — | 0.5 | OEM-X60005-6 | — | — | — |
| 8 | Ignition 4 | — | W27 | — | 0.5 | OEM-X60005-8 | — | — | — |
| 9 | Ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-X60001-1 | Injector relay control | low_side_out | SPEEDUINO-A-16 | Proto area 3 (fuel pump) | low_side_out | corroborated | |
| OEM-X60001-2 | DBW output-stage supply (P_DKSM+) | power_in | — | — | — | single_source | |
| OEM-X60001-4 | Power ground | ground | SPEEDUINO-A-10 + SPEEDUINO-A-9 | Ground + Ground | ground | corroborated | |
| OEM-X60001-5 | Power ground | ground | SPEEDUINO-A-10 + SPEEDUINO-A-9 | Ground + Ground | ground | corroborated | |
| OEM-X60001-6 | Power ground | ground | SPEEDUINO-A-10 + SPEEDUINO-A-9 | Ground + Ground | ground | corroborated | |
| OEM-X60001-7 | Battery constant (terminal 30) | power_in | — | — | — | corroborated | |
| OEM-X60001-8 | ECU main power (terminal 87 via main relay) | power_in | — | — | — | corroborated | |
| OEM-X60001-9 | DBW output-stage return (P_DKSM-) | ground | SPEEDUINO-A-10 + SPEEDUINO-A-9 | Ground + Ground | ground | single_source | |
| OEM-X60002-1 | O2 sensor heater, front 1 (pre-cat) | low_side_out | SPEEDUINO-A-35 | Boost | low_side_out | corroborated | |
| OEM-X60002-12 | O2 sensor heater, rear 2 (post-cat) | low_side_out | SPEEDUINO-A-37 | PWM idle | low_side_out | corroborated | |
| OEM-X60002-14 | O2 sensor signal, rear 2 (post-cat) | lambda_nb_in | SPEEDUINO-A-21 | O2 sensor | lambda_nb_in | corroborated | |
| OEM-X60002-16 | O2 sensor signal, rear 1 (post-cat) | lambda_nb_in | — | — | — | corroborated | |
| OEM-X60002-2 | O2 sensor heater, front 2 (pre-cat) | low_side_out | SPEEDUINO-A-38 | VVT | low_side_out | corroborated | |
| OEM-X60002-23 | Main relay control | low_side_out | SPEEDUINO-A-15 | Proto area 2 (fan) | low_side_out | corroborated | |
| OEM-X60002-6 | O2 sensor heater, rear 1 (post-cat) | low_side_out | — | — | — | corroborated | |
| OEM-X60003-1 | Mass air flow (MAF) signal | analog_in | — | — | — | corroborated | |
| OEM-X60003-10 | VANOS intake solenoid | low_side_out | — | — | — | corroborated | |
| OEM-X60003-11 | Injector cylinder 5 | injector_out | SPEEDUINO-A-1 | Injector 1 | injector_out | corroborated | |
| OEM-X60003-12 | Map-controlled thermostat | low_side_out | — | — | — | corroborated | |
| OEM-X60003-13 | Injector cylinder 1 | injector_out | SPEEDUINO-A-1 | Injector 1 | injector_out | corroborated | |
| OEM-X60003-15 | Throttle ground | sensor_ground | SPEEDUINO-A-12 + SPEEDUINO-A-23 | Ground + Ground | sensor_ground | corroborated | |
| OEM-X60003-16 | Oil pressure switch | digital_in | SPEEDUINO-A-18 | Proto area 5 (clutch) | digital_in | corroborated | |
| OEM-X60003-21 | Evap purge valve | low_side_out | — | — | — | corroborated | |
| OEM-X60003-22 | Idle speed control, close | hbridge_out | SPEEDUINO-A-29 | Idle stepper 2B | hbridge_out | corroborated | |
| OEM-X60003-23 | Idle speed control, open | hbridge_out | SPEEDUINO-A-30 | Idle stepper 2A | hbridge_out | corroborated | |
| OEM-X60003-26 | Injector cylinder 3 | injector_out | SPEEDUINO-A-3 | Injector 3 | injector_out | corroborated | |
| OEM-X60003-27 | Intake air temperature (IAT) | temp_in | SPEEDUINO-A-20 | Inlet air temp (IAT) | temp_in | corroborated | |
| OEM-X60003-28 | Engine coolant temperature (ECT) | temp_in | SPEEDUINO-A-19 | Coolant temp (CLT) | temp_in | corroborated | |
| OEM-X60003-29 | Intake camshaft position | trigger_in | SPEEDUINO-A-26 | VR2- | trigger_in | corroborated | |
| OEM-X60003-3 | Crankshaft position | trigger_in | SPEEDUINO-A-25 | Crank input / VR1+ | trigger_in | corroborated | |
| OEM-X60003-30 | Exhaust camshaft position | trigger_in | SPEEDUINO-A-24 | Cam input / VR2+ | trigger_in | corroborated | |
| OEM-X60003-31 | Throttle position sensor 2 | analog_in | — | — | — | corroborated | |
| OEM-X60003-32 | Throttle position sensor 1 | analog_in | SPEEDUINO-A-22 | TPS input | analog_in | corroborated | |
| OEM-X60003-33 | Knock sensor 1 | knock_in | — | — | — | corroborated | |
| OEM-X60003-34 | Knock sensor 2 | knock_in | — | — | — | corroborated | |
| OEM-X60003-35 | ECT ground | sensor_ground | SPEEDUINO-A-12 + SPEEDUINO-A-23 | Ground + Ground | sensor_ground | corroborated | |
| OEM-X60003-36 | Intake camshaft ground | sensor_ground | SPEEDUINO-A-12 + SPEEDUINO-A-23 | Ground + Ground | sensor_ground | corroborated | |
| OEM-X60003-37 | Crankshaft ground | sensor_ground | SPEEDUINO-A-12 + SPEEDUINO-A-23 | Ground + Ground | sensor_ground | corroborated | |
| OEM-X60003-4 | MAF supply | power_in | — | — | — | corroborated | |
| OEM-X60003-42 | Throttle motor drive 1 (H-bridge) | hbridge_out | SPEEDUINO-A-31 | Idle stepper 1A | hbridge_out | corroborated | |
| OEM-X60003-43 | Throttle motor drive 2 (H-bridge) | hbridge_out | SPEEDUINO-A-32 | Idle stepper 1B | hbridge_out | corroborated | |
| OEM-X60003-44 | Engine oil temperature | temp_in | — | — | — | corroborated | |
| OEM-X60003-45 | Oil temperature ground | sensor_ground | SPEEDUINO-A-12 + SPEEDUINO-A-23 | Ground + Ground | sensor_ground | corroborated | |
| OEM-X60003-46 | Knock sensor 3 | knock_in | — | — | — | corroborated | |
| OEM-X60003-47 | Knock sensor 4 | knock_in | — | — | — | corroborated | |
| OEM-X60003-49 | Exhaust camshaft ground | sensor_ground | SPEEDUINO-A-12 + SPEEDUINO-A-23 | Ground + Ground | sensor_ground | corroborated | |
| OEM-X60003-5 | Throttle (EDK/ITB) supply | power_in | — | — | — | corroborated | |
| OEM-X60003-50 | Oil level switch | digital_in | SPEEDUINO-A-14 | Proto area 1 (flex fuel) | digital_in | corroborated | |
| OEM-X60003-6 | Injector cylinder 2 | injector_out | SPEEDUINO-A-2 | Injector 2 | injector_out | corroborated | |
| OEM-X60003-7 | Injector cylinder 4 | injector_out | SPEEDUINO-A-5 | Injector 4 | injector_out | corroborated | |
| OEM-X60003-8 | Injector cylinder 6 | injector_out | SPEEDUINO-A-2 | Injector 2 | injector_out | corroborated | |
| OEM-X60003-9 | VANOS exhaust solenoid | low_side_out | — | — | — | corroborated | |
| OEM-X60004-10 | Fuel pump relay control | low_side_out | SPEEDUINO-A-36 | Idle 2 (3-wire idle) | low_side_out | corroborated | |
| OEM-X60004-12 | Pedal ground 2 | sensor_ground | SPEEDUINO-A-12 + SPEEDUINO-A-23 | Ground + Ground | sensor_ground | corroborated | |
| OEM-X60004-13 | Pedal position signal 2 | analog_in | — | — | — | corroborated | |
| OEM-X60004-14 | Pedal +5V supply 2 | vref | SPEEDUINO-A-13 | 5V | vref | corroborated | |
| OEM-X60004-7 | Pedal ground 1 | sensor_ground | SPEEDUINO-A-12 + SPEEDUINO-A-23 | Ground + Ground | sensor_ground | corroborated | |
| OEM-X60004-8 | Pedal position signal 1 | analog_in | — | — | — | corroborated | |
| OEM-X60004-9 | Pedal +5V supply 1 | vref | SPEEDUINO-A-13 | 5V | vref | corroborated | |
| OEM-X60005-1 | Ignition coil 5 | ignition_out | — | — | — | corroborated | |
| OEM-X60005-4 | Ignition coil 3 | ignition_out | SPEEDUINO-A-33 | Ignition 3 | ignition_out | corroborated | |
| OEM-X60005-5 | Ignition ground | ground | SPEEDUINO-A-10 + SPEEDUINO-A-9 | Ground + Ground | ground | corroborated | |
| OEM-X60005-6 | Ignition coil 1 | ignition_out | SPEEDUINO-A-7 | Ignition 1 | ignition_out | corroborated | |
| OEM-X60005-7 | Ignition coil 2 | ignition_out | SPEEDUINO-A-34 | Ignition 2 | ignition_out | corroborated | |
| OEM-X60005-8 | Ignition coil 4 | ignition_out | SPEEDUINO-A-8 | Ignition 4 | ignition_out | corroborated | |
| OEM-X60005-9 | Ignition coil 6 | ignition_out | — | — | — | corroborated |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-X60001-4 | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W2 | OEM-X60001-5 | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W3 | OEM-X60001-6 | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W4 | OEM-X60001-9 | SP-GND-1 | 0.85 | no route | DBW output-stage return (P_DKSM-) | — | |
| W5 | OEM-X60005-5 | SP-GND-1 | 0.85 | no route | Ignition ground | — | |
| W6 | SP-GND-1 | SPEEDUINO-A-10 | 0.85 | no route | Ground | — | |
| W7 | SP-GND-1 | SPEEDUINO-A-9 | 0.85 | no route | Ground | — | |
| W8 | OEM-X60003-15 | SP-0V-1 | 0.5 | no route | Throttle ground | — | |
| W9 | OEM-X60003-35 | SP-0V-1 | 0.5 | no route | ECT ground | — | |
| W10 | OEM-X60003-36 | SP-0V-1 | 0.5 | no route | Intake camshaft ground | — | |
| W11 | OEM-X60003-37 | SP-0V-1 | 0.5 | no route | Crankshaft ground | — | |
| W12 | OEM-X60003-45 | SP-0V-1 | 0.5 | no route | Oil temperature ground | — | |
| W13 | OEM-X60003-49 | SP-0V-1 | 0.5 | no route | Exhaust camshaft ground | — | |
| W14 | OEM-X60004-12 | SP-0V-1 | 0.5 | no route | Pedal ground 2 | — | |
| W15 | OEM-X60004-7 | SP-0V-1 | 0.5 | no route | Pedal ground 1 | — | |
| W16 | SP-0V-1 | SPEEDUINO-A-12 | 0.5 | no route | Ground | — | |
| W17 | SP-0V-1 | SPEEDUINO-A-23 | 0.5 | no route | Ground | — | |
| W18 | OEM-X60004-14 | SP-5V1-1 | 0.5 | no route | Pedal +5V supply 2 | — | |
| W19 | OEM-X60004-9 | SP-5V1-1 | 0.5 | no route | Pedal +5V supply 1 | — | |
| W20 | SP-5V1-1 | SPEEDUINO-A-13 | 0.5 | no route | 5V | — | |
| W21 | OEM-X60003-3 | SPEEDUINO-A-25 | 0.5 | no route | Crankshaft position | — | |
| W22 | OEM-X60003-30 | SPEEDUINO-A-24 | 0.5 | no route | Exhaust camshaft position | — | |
| W23 | OEM-X60003-29 | SPEEDUINO-A-26 | 0.5 | no route | Intake camshaft position | — | |
| W24 | OEM-X60005-6 | SPEEDUINO-A-7 | 0.5 | no route | Ignition coil 1 | — | |
| W25 | OEM-X60005-7 | SPEEDUINO-A-34 | 0.5 | no route | Ignition coil 2 | — | |
| W26 | OEM-X60005-4 | SPEEDUINO-A-33 | 0.5 | no route | Ignition coil 3 | — | |
| W27 | OEM-X60005-8 | SPEEDUINO-A-8 | 0.5 | no route | Ignition coil 4 | — | |
| W28 | OEM-X60003-13 | SPEEDUINO-A-1 | 0.5 | no route | Injector cylinder 1 | — | |
| W29 | OEM-X60003-6 | SPEEDUINO-A-2 | 0.5 | no route | Injector cylinder 2 | — | |
| W30 | OEM-X60003-26 | SPEEDUINO-A-3 | 0.5 | no route | Injector cylinder 3 | — | |
| W31 | OEM-X60003-7 | SPEEDUINO-A-5 | 0.5 | no route | Injector cylinder 4 | — | |
| W32 | OEM-X60003-11 | SPEEDUINO-A-1 | 0.5 | no route | Injector cylinder 5 | — | |
| W33 | OEM-X60003-8 | SPEEDUINO-A-2 | 0.5 | no route | Injector cylinder 6 | — | |
| W34 | OEM-X60003-42 | SPEEDUINO-A-31 | 0.5 | no route | Throttle motor drive 1 (H-bridge) | — | |
| W35 | OEM-X60003-43 | SPEEDUINO-A-32 | 0.5 | no route | Throttle motor drive 2 (H-bridge) | — | |
| W36 | OEM-X60003-22 | SPEEDUINO-A-29 | 0.5 | no route | Idle speed control, close | — | |
| W37 | OEM-X60003-23 | SPEEDUINO-A-30 | 0.5 | no route | Idle speed control, open | — | |
| W38 | OEM-X60001-1 | SPEEDUINO-A-16 | 0.5 | no route | Injector relay control | — | |
| W39 | OEM-X60002-23 | SPEEDUINO-A-15 | 0.5 | no route | Main relay control | — | |
| W40 | OEM-X60004-10 | SPEEDUINO-A-36 | 0.5 | no route | Fuel pump relay control | — | |
| W41 | OEM-X60002-1 | SPEEDUINO-A-35 | 0.5 | no route | O2 sensor heater, front 1 (pre-cat) | — | |
| W42 | OEM-X60002-12 | SPEEDUINO-A-37 | 0.5 | no route | O2 sensor heater, rear 2 (post-cat) | — | |
| W43 | OEM-X60002-2 | SPEEDUINO-A-38 | 0.5 | no route | O2 sensor heater, front 2 (pre-cat) | — | |
| W44 | OEM-X60003-32 | SPEEDUINO-A-22 | 0.5 | no route | Throttle position sensor 1 | — | |
| W45 | OEM-X60002-14 | SPEEDUINO-A-21 | 0.5 | no route | O2 sensor signal, rear 2 (post-cat) | — | |
| W46 | OEM-X60003-28 | SPEEDUINO-A-19 | 0.5 | no route | Engine coolant temperature (ECT) | — | |
| W47 | OEM-X60003-27 | SPEEDUINO-A-20 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W48 | OEM-X60003-16 | SPEEDUINO-A-18 | 0.5 | no route | Oil pressure switch | — | |
| W49 | OEM-X60003-50 | SPEEDUINO-A-14 | 0.5 | no route | Oil level switch | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| connector | BMW-E46-MSS54-CONN | BMW | E46 DME (MSS54) harness connector | 1.000 | ea |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (13)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | NET_MERGED | OEM-X60003-11 + OEM-X60003-13 + SPEEDUINO-A-1 | 2 different OEM functions share one net: OEM-X60003-11 Injector cylinder 5; OEM-X60003-13 Injector cylinder 1 |
| error | NET_MERGED | OEM-X60003-6 + OEM-X60003-8 + SPEEDUINO-A-2 | 2 different OEM functions share one net: OEM-X60003-6 Injector cylinder 2; OEM-X60003-8 Injector cylinder 6 |
| error | REQUIRED_UNMAPPED | OEM-X60001-2 | Required OEM function "DBW output-stage supply (P_DKSM+)" (power_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-X60001-8 | Required OEM function "ECU main power (terminal 87 via main relay)" (power_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-X60003-1 | Required OEM function "Mass air flow (MAF) signal" (analog_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-X60003-31 | Required OEM function "Throttle position sensor 2" (analog_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-X60004-13 | Required OEM function "Pedal position signal 2" (analog_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-X60004-8 | Required OEM function "Pedal position signal 1" (analog_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-X60005-1 | Required OEM function "Ignition coil 5" (ignition_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-X60005-9 | Required OEM function "Ignition coil 6" (ignition_out) is not connected to the new ECU. |
| warn | DBW_MOTOR_CURRENT | SPEEDUINO-A-31 | Cannot confirm Speeduino can drive the throttle motor: neither the motor stall current (OEM-X60003-42) nor the peak rating of SPEEDUINO-A-31 "Idle stepper 1A" is known. |
| warn | DBW_MOTOR_CURRENT | SPEEDUINO-A-32 | Cannot confirm Speeduino can drive the throttle motor: neither the motor stall current (OEM-X60003-43) nor the peak rating of SPEEDUINO-A-32 "Idle stepper 1B" is known. |
| info | UNMAPPED | OEM | 13 optional OEM pins are not mapped: OEM-X60002-16 O2 sensor signal, rear 1 (post-cat); OEM-X60002-6 O2 sensor heater, rear 1 (post-cat); OEM-X60003-10 VANOS intake solenoid; OEM-X60003-12 Map-controlled thermostat; OEM-X60003-21 Evap purge valve; OEM-X60003-33 Knock sensor 1; OEM-X60003-34 Knock sensor 2; OEM-X60003-4 MAF supply; OEM-X60003-44 Engine oil temperature; OEM-X60003-46 Knock sensor 3; OEM-X60003-47 Knock sensor 4; OEM-X60003-5 Throttle (EDK/ITB) supply; OEM-X60003-9 VANOS exhaust solenoid |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-X60001-7 | Battery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed. | mapping-proposal |
Notes
Fit check: needs add-on. Resolve these before building: - No drive-by-wire; needs a cable-throttle conversion or an external DBW controller - Needs CAN (E46 K-bus/CAN); not documented for this ECU - Trigger pattern for BMW S54 not found in the ECU's docs (no S-series-specific trigger) - No knock input; the stock knock sensor would be unused - Only 4 ignition outputs for 6 cylinders: wasted spark (pair coils per firing order) - Only 4 injector outputs for 6 injectors: batch / semi-sequential injection - This car has EWS 3.3 (rolling code) immobilizer; needs a delete/bypass Auto-mapped by auto_map() from the library pin data on 2026-10-11. Review every wire against both manuals before building. Open items: - Main-relay feed: no ecu_main_power pin on the stock or the new ECU - OEM-X60005 1: Ignition coil 5: no free ignition output on Speeduino Speeduino - OEM-X60005 9: Ignition coil 6: no free ignition output on Speeduino Speeduino - OEM-X60003 1: Mass air flow (MAF) signal: no free maf/analog_0_5 on Speeduino Speeduino - OEM-X60004 8: Pedal position signal 1: no free tps/analog_0_5 on Speeduino Speeduino - OEM-X60003 31: Throttle position sensor 2: no free tps/analog_0_5 on Speeduino Speeduino - OEM-X60004 13: Pedal position signal 2: no free tps/analog_0_5 on Speeduino Speeduino - OEM-X60001 2: DBW output-stage supply (P_DKSM+): no rule for class switched_feed; wire by hand - OEM-X60001 8: ECU main power (terminal 87 via main relay): no rule for class ecu_main_power; wire by hand Not wired: - OEM-X60001 7: Battery constant (terminal 30): Speeduino Speeduino has no battery-constant input; not needed - OEM-X60003 33: Knock sensor 1: no free knock input on Speeduino Speeduino - OEM-X60003 34: Knock sensor 2: no free knock input on Speeduino Speeduino - OEM-X60003 46: Knock sensor 3: no free knock input on Speeduino Speeduino - OEM-X60003 47: Knock sensor 4: no free knock input on Speeduino Speeduino - OEM-X60002 6: O2 sensor heater, rear 1 (post-cat): no free heater_low_side/low_side/ls_hs/hbridge on Speeduino Speeduino - OEM-X60003 10: VANOS intake solenoid: no free low_side/ls_hs/injector/hbridge on Speeduino Speeduino - OEM-X60003 12: Map-controlled thermostat: no free low_side/ls_hs/injector/hbridge on Speeduino Speeduino - OEM-X60003 21: Evap purge valve: no free low_side/ls_hs/injector/hbridge on Speeduino Speeduino - OEM-X60003 9: VANOS exhaust solenoid: no free low_side/ls_hs/injector/hbridge on Speeduino Speeduino - OEM-X60002 16: O2 sensor signal, rear 1 (post-cat): no free o2_narrowband/analog_0_5 on Speeduino Speeduino - OEM-X60003 44: Engine oil temperature: no free thermistor/analog_0_5 on Speeduino Speeduino - OEM-X60003 4: MAF supply: no rule for class switched_feed; wire by hand - OEM-X60003 5: Throttle (EDK/ITB) supply: no rule for class switched_feed; wire by hand
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | oem_wiring_diagram | BMW WDS A6000 DME pin table, E83 X3 (M54B30/MS45) | https://wds.psjr.org/sv/e83/zinfo/E83_PA6000A.htm | — | — | — |
| 4 | vendor_doc | Speeduino Manual (08/04/25) — V0.4 board IDC40 pinout & features | https://speeduino.com/Speeduino_manual.pdf | archive | 2026-10-05 | 21806bd29ef0 |
| 2 | community_copy | bimmer-service: DME MSS54 (S54) pinout | https://www.bimmer-service.com/2025/11/14/dme-mss54-s54-pinout-schematic-diagram/ | — | — | — |
| 2 | community_copy | rusefi wiki: 2002 and 2004 BMW M3 E46 DME pinout (S54/MSS54) | https://github.com/rusefi/rusefi/wiki/2002-and-2004-BMW-M3-E46-DME-pinout | — | — | — |