Lexus IS300 (XE10 / JCE10) 2001-05 2JZ-GE VVT-i → Speeduino Speeduino v0.4 (auto)
Lexus IS300 (XE10 / JCE10) 2001-05 2JZ-GE VVT-i — Speeduino — Speeduino
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-20
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 | 3: read the Findings page before cutting any wire |
| Size of the job | 43 wires · 13 connectors · 0 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-E2-13 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-E3-16 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-E3-7 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-E3-8 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-E3-9 | MAIN-R-COIL+ | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | NEW-BATT-1 | MAIN-R-IN | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | MAIN-R-COIL- | SP-GND-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | MAIN-R-OUT | SPEEDUINO-PWR-12V | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-E6-17 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-E7-21 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-GND-1 | SPEEDUINO-A-10 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-GND-1 | SPEEDUINO-A-9 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-E6-18 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-E6-19 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-E7-22 | 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-E6-2 | SPEEDUINO-A-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-E7-23 | SPEEDUINO-A-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-E7-10 | SPEEDUINO-A-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-E7-11 | SPEEDUINO-A-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-E7-12 | SPEEDUINO-A-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-E7-13 | SPEEDUINO-A-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-E6-5 | SPEEDUINO-A-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-E6-6 | SPEEDUINO-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-E7-1 | SPEEDUINO-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-E7-2 | SPEEDUINO-A-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-E7-3 | SPEEDUINO-A-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-E7-4 | SPEEDUINO-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-E7-7 | SPEEDUINO-A-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-E7-8 | SPEEDUINO-A-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-E7-17 | SPEEDUINO-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-E7-18 | SPEEDUINO-A-36 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-E7-19 | SPEEDUINO-A-35 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-E7-20 | SPEEDUINO-A-37 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-E6-15 | SPEEDUINO-A-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-E6-14 | SPEEDUINO-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-E3-10 | SPEEDUINO-A-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-E3-4 | SPEEDUINO-A-38 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-E2-24 | SPEEDUINO-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-E6-22 | SPEEDUINO-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-E5-11 | SPEEDUINO-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-E5-5 | SPEEDUINO-A-18 | 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 | MAIN-R-COIL+ | MAIN-R-COIL- | open (OL) | +12 V supply must not touch power ground | |
| 2 | MAIN-R-COIL+ | SPEEDUINO-A-12 | open (OL) | +12 V supply must not touch sensor ground | |
| 3 | OEM-E2-13 | MAIN-R-COIL- | open (OL) | +12 V supply must not touch power ground | |
| 4 | OEM-E2-13 | SPEEDUINO-A-12 | open (OL) | +12 V supply must not touch sensor ground | |
| 5 | MAIN-R-COIL+ | SPEEDUINO-A-13 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 6 | MAIN-R-COIL- | MAIN-R-OUT | open (OL) | power ground must not touch +12 V supply | |
| 7 | MAIN-R-COIL- | NEW-BATT-1 | open (OL) | power ground must not touch +12 V supply | |
| 8 | MAIN-R-COIL- | SPEEDUINO-A-13 | open (OL) | power ground must not touch 5 V sensor reference | |
| 9 | OEM-E2-13 | SPEEDUINO-A-13 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 10 | SPEEDUINO-A-12 | MAIN-R-OUT | open (OL) | sensor ground must not touch +12 V supply | |
| 11 | SPEEDUINO-A-12 | NEW-BATT-1 | open (OL) | sensor ground must not touch +12 V supply | |
| 12 | SPEEDUINO-A-12 | SPEEDUINO-A-13 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 13 | SPEEDUINO-A-13 | MAIN-R-OUT | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 14 | SPEEDUINO-A-13 | NEW-BATT-1 | open (OL) | 5 V sensor reference must not touch +12 V supply |
If any reading doesn't match, stop and get help before powering up.
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
MAIN-R
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| COIL+ | Relay coil positive (ignition-switched +12V) | — | W5 | — | 0.5 | OEM-E3-9 | — | — | — |
| COIL- | Relay coil negative (ECU low-side driver) | — | W7 | — | 0.5 | SP-GND-1 | — | — | — |
| IN | Relay contact input (battery + via main fuse) | — | W6 | — | 0.85 | NEW-BATT-1 | — | — | — |
| OUT | Relay contact output (switched +12V bus) | — | W8 | — | 0.85 | SPEEDUINO-PWR-12V | — | — | — |
NEW-BATT
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W6 | — | 0.85 | MAIN-R-IN | — | — | — |
OEM-E2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 13 | ETCS power (TBP, throttle bypass) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 24 | O2 right rear (OXR2) | — | W40 | — | 0.5 | SPEEDUINO-A-21 | — | — | — |
| 25 | O2 heater right rear (HTR2) | — | — | — | — | — | — | — | — |
| 26 | O2 heater left rear (HTL2) | — | — | — | — | — | — | — | — |
OEM-E3
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Battery constant (BATT) | — | — | — | — | — | — | — | — |
| 10 | EFI main relay control (MREL) | — | W38 | — | 0.5 | SPEEDUINO-A-16 | — | — | — |
| 11 | Serial diagnostic (SIL) | — | — | — | — | — | — | — | — |
| 16 | EFI main relay (+B) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 4 | Fuel pump relay (FPR) | — | W39 | — | 0.5 | SPEEDUINO-A-38 | — | — | — |
| 5 | Fuel pump control (FC) | — | — | — | — | — | — | — | — |
| 6 | Check-engine lamp (W) | — | — | — | — | — | — | — | — |
| 7 | ETCS main relay (+BM) | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 8 | EFI main relay (+B2) | — | W4 | — | 0.85 | SP-14V-1 | — | — | — |
| 9 | Ignition switch (IGSW) | — | W5 | — | 0.5 | MAIN-R-COIL+ | — | — | — |
OEM-E4
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 13 | A/C clutch relay (ACMG) | — | — | — | — | — | — | — | — |
| 18 | EVAP vapor pressure (PTNK) | — | — | — | — | — | — | — | — |
| 2 | Starter signal (STA) | — | — | — | — | — | — | — | — |
| 5 | Diagnostic/timing check (TC) | — | — | — | — | — | — | — | — |
| 6 | Stop light switch (STP) | — | — | — | — | — | — | — | — |
| 8 | O2 left rear (OXL2) | — | — | — | — | — | — | — | — |
OEM-E5
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 11 | Vehicle speed sensor (SP2-) | — | W42 | — | 0.5 | SPEEDUINO-A-14 | — | — | — |
| 12 | Canister close valve (CCV) | — | — | — | — | — | — | — | — |
| 5 | Vehicle speed sensor (SP2+) | — | W43 | — | 0.5 | SPEEDUINO-A-18 | — | — | — |
OEM-E6
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 10 | Mass air flow (VG) | — | — | — | — | — | — | — | — |
| 11 | O2 right front (OXR1) | — | — | — | — | — | — | — | — |
| 12 | O2 left front (OXL1) | — | — | — | — | — | — | — | — |
| 14 | Coolant temperature (THW) | — | W37 | — | 0.5 | SPEEDUINO-A-19 | — | — | — |
| 15 | Accelerator pedal 1 (VPA) | — | W36 | — | 0.5 | SPEEDUINO-A-22 | — | — | — |
| 16 | Accelerator pedal 2 (VPA2) | — | — | — | — | — | — | — | — |
| 17 | Power ground (E1) | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 18 | Sensor ground (E2) | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | MAF ground (EVG) | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 2 | Sensor supply +5V (VC) | — | W18 | — | 0.5 | SPEEDUINO-A-13 | — | — | — |
| 22 | Intake air temperature (THA) | — | W41 | — | 0.5 | SPEEDUINO-A-20 | — | — | — |
| 23 | Throttle position 1 (VTA) | — | — | — | — | — | — | — | — |
| 24 | Throttle position 2 (VTA2) | — | — | — | — | — | — | — | — |
| 3 | O2 heater right front (HTR) | — | — | — | — | — | — | — | — |
| 4 | O2 heater left front (HTL) | — | — | — | — | — | — | — | — |
| 5 | Injector 1 (#10) | — | W24 | — | 0.5 | SPEEDUINO-A-1 | — | — | — |
| 6 | Injector 2 (#20) | — | W25 | — | 0.5 | SPEEDUINO-A-2 | — | — | — |
| 7 | EVAP purge VSV (PRG) | — | — | — | — | — | — | — | — |
OEM-E7
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injector 3 (#30) | — | W26 | — | 0.5 | SPEEDUINO-A-3 | — | — | — |
| 10 | Cam position (G2) | — | W20 | — | 0.5 | SPEEDUINO-A-24 | — | — | — |
| 11 | Ignition 1 (IGT) | — | W21 | — | 0.5 | SPEEDUINO-A-7 | — | — | — |
| 12 | Ignition 2 (IGT2) | — | W22 | — | 0.5 | SPEEDUINO-A-34 | — | — | — |
| 13 | Ignition 3 (IGT3) | — | W23 | — | 0.5 | SPEEDUINO-A-33 | — | — | — |
| 17 | VVT-i OCV - (OCV-) | — | W32 | — | 0.5 | SPEEDUINO-A-15 | — | — | — |
| 18 | VVT-i OCV + (OCV+) | — | W33 | — | 0.5 | SPEEDUINO-A-36 | — | — | — |
| 19 | ETCS throttle clutch - (CL-) | — | W34 | — | 0.5 | SPEEDUINO-A-35 | — | — | — |
| 2 | Injector 4 (#40) | — | W27 | — | 0.5 | SPEEDUINO-A-5 | — | — | — |
| 20 | ETCS throttle clutch + (CL+) | — | W35 | — | 0.5 | SPEEDUINO-A-37 | — | — | — |
| 21 | Power ground (E01) | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| 22 | Crank position return (NE-) | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 23 | Crank position (NE) | — | W19 | — | 0.5 | SPEEDUINO-A-25 | — | — | — |
| 25 | Igniter feedback (IGF) | — | — | — | — | — | — | — | — |
| 27 | Knock sensor 2 (KNK2) | — | — | — | — | — | — | — | — |
| 28 | Knock sensor 1 (KNK1) | — | — | — | — | — | — | — | — |
| 3 | Injector 5 (#50) | — | W28 | — | 0.5 | SPEEDUINO-A-1 | — | — | — |
| 4 | Injector 6 (#60) | — | W29 | — | 0.5 | SPEEDUINO-A-2 | — | — | — |
| 5 | ACIS intake VSV | — | — | — | — | — | — | — | — |
| 7 | ETCS throttle motor − (M−) | — | W30 | — | 0.5 | SPEEDUINO-A-32 | — | — | — |
| 8 | ETCS throttle motor + (M+) | — | W31 | — | 0.5 | SPEEDUINO-A-31 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W13 | — | 0.5 | OEM-E6-18 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | OEM-E6-19 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | OEM-E7-22 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | SPEEDUINO-A-12 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | SPEEDUINO-A-23 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-E2-13 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-E3-16 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | OEM-E3-7 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | OEM-E3-8 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W7 | — | 0.5 | MAIN-R-COIL- | — | — | — |
| 1 | — | — | W9 | — | 0.85 | OEM-E6-17 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | OEM-E7-21 | — | — | — |
| 1 | — | — | W11 | — | 0.85 | SPEEDUINO-A-10 | — | — | — |
| 1 | — | — | W12 | — | 0.85 | SPEEDUINO-A-9 | — | — | — |
SPEEDUINO-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injector 1 | — | W24 | — | 0.5 | OEM-E6-5 | — | — | — |
| 1 | Injector 1 | — | W28 | — | 0.5 | OEM-E7-3 | — | — | — |
| 10 | Ground | — | W11 | — | 0.85 | SP-GND-1 | — | — | — |
| 11 | MAP sensor (0-5V) | — | — | — | — | — | — | — | — |
| 12 | Ground | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 13 | 5V | — | W18 | — | 0.5 | OEM-E6-2 | — | — | — |
| 14 | Proto area 1 (flex fuel) | — | W42 | — | 0.5 | OEM-E5-11 | — | — | — |
| 15 | Proto area 2 (fan) | — | W32 | — | 0.5 | OEM-E7-17 | — | — | — |
| 16 | Proto area 3 (fuel pump) | — | W38 | — | 0.5 | OEM-E3-10 | — | — | — |
| 17 | Proto area 4 (tachometer) | — | — | — | — | — | — | — | — |
| 18 | Proto area 5 (clutch) | — | W43 | — | 0.5 | OEM-E5-5 | — | — | — |
| 19 | Coolant temp (CLT) | — | W37 | — | 0.5 | OEM-E6-14 | — | — | — |
| 2 | Injector 2 | — | W25 | — | 0.5 | OEM-E6-6 | — | — | — |
| 2 | Injector 2 | — | W29 | — | 0.5 | OEM-E7-4 | — | — | — |
| 20 | Inlet air temp (IAT) | — | W41 | — | 0.5 | OEM-E6-22 | — | — | — |
| 21 | O2 sensor | — | W40 | — | 0.5 | OEM-E2-24 | — | — | — |
| 22 | TPS input | — | W36 | — | 0.5 | OEM-E6-15 | — | — | — |
| 23 | Ground | — | W17 | — | 0.5 | SP-0V-1 | — | — | — |
| 24 | Cam input / VR2+ | — | W20 | — | 0.5 | OEM-E7-10 | — | — | — |
| 25 | Crank input / VR1+ | — | W19 | — | 0.5 | OEM-E7-23 | — | — | — |
| 26 | VR2- | — | — | — | — | — | — | — | — |
| 27 | VR1- | — | — | — | — | — | — | — | — |
| 28 | 5V | — | — | — | — | — | — | — | — |
| 29 | Idle stepper 2B | — | — | — | — | — | — | — | — |
| 3 | Injector 3 | — | W26 | — | 0.5 | OEM-E7-1 | — | — | — |
| 30 | Idle stepper 2A | — | — | — | — | — | — | — | — |
| 31 | Idle stepper 1A | — | W31 | — | 0.5 | OEM-E7-8 | — | — | — |
| 32 | Idle stepper 1B | — | W30 | — | 0.5 | OEM-E7-7 | — | — | — |
| 33 | Ignition 3 | — | W23 | — | 0.5 | OEM-E7-13 | — | — | — |
| 34 | Ignition 2 | — | W22 | — | 0.5 | OEM-E7-12 | — | — | — |
| 35 | Boost | — | W34 | — | 0.5 | OEM-E7-19 | — | — | — |
| 36 | Idle 2 (3-wire idle) | — | W33 | — | 0.5 | OEM-E7-18 | — | — | — |
| 37 | PWM idle | — | W35 | — | 0.5 | OEM-E7-20 | — | — | — |
| 38 | VVT | — | W39 | — | 0.5 | OEM-E3-4 | — | — | — |
| 5 | Injector 4 | — | W27 | — | 0.5 | OEM-E7-2 | — | — | — |
| 7 | Ignition 1 | — | W21 | — | 0.5 | OEM-E7-11 | — | — | — |
| 8 | Ignition 4 | — | — | — | — | — | — | — | — |
| 9 | Ground | — | W12 | — | 0.85 | SP-GND-1 | — | — | — |
SPEEDUINO-PWR
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 12V | Main power (+12 V switched) | — | W8 | — | 0.85 | MAIN-R-OUT | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-E2-13 | ETCS power (TBP, throttle bypass) | power_in | — | — | — | single_source | |
| OEM-E2-24 | O2 right rear (OXR2) | lambda_nb_in | SPEEDUINO-A-21 | O2 sensor | lambda_nb_in | single_source | |
| OEM-E2-25 | O2 heater right rear (HTR2) | low_side_out | — | — | — | single_source | |
| OEM-E2-26 | O2 heater left rear (HTL2) | low_side_out | — | — | — | single_source | |
| OEM-E3-1 | Battery constant (BATT) | power_in | — | — | — | single_source | |
| OEM-E3-10 | EFI main relay control (MREL) | low_side_out | SPEEDUINO-A-16 | Proto area 3 (fuel pump) | low_side_out | single_source | |
| OEM-E3-11 | Serial diagnostic (SIL) | serial | — | — | — | single_source | |
| OEM-E3-16 | EFI main relay (+B) | power_in | — | — | — | single_source | |
| OEM-E3-4 | Fuel pump relay (FPR) | low_side_out | SPEEDUINO-A-38 | VVT | low_side_out | single_source | |
| OEM-E3-5 | Fuel pump control (FC) | low_side_out | — | — | — | single_source | |
| OEM-E3-6 | Check-engine lamp (W) | low_side_out | — | — | — | single_source | |
| OEM-E3-7 | ETCS main relay (+BM) | power_in | — | — | — | single_source | |
| OEM-E3-8 | EFI main relay (+B2) | power_in | — | — | — | single_source | |
| OEM-E3-9 | Ignition switch (IGSW) | digital_in | MAIN-R-COIL+ | Relay coil positive (ignition-switched +12V) | power_in | single_source | |
| OEM-E4-13 | A/C clutch relay (ACMG) | low_side_out | — | — | — | single_source | |
| OEM-E4-18 | EVAP vapor pressure (PTNK) | analog_in | — | — | — | single_source | |
| OEM-E4-2 | Starter signal (STA) | digital_in | — | — | — | single_source | |
| OEM-E4-5 | Diagnostic/timing check (TC) | digital_in | — | — | — | single_source | |
| OEM-E4-6 | Stop light switch (STP) | digital_in | — | — | — | single_source | |
| OEM-E4-8 | O2 left rear (OXL2) | lambda_nb_in | — | — | — | single_source | |
| OEM-E5-11 | Vehicle speed sensor (SP2-) | digital_in | SPEEDUINO-A-14 | Proto area 1 (flex fuel) | digital_in | single_source | |
| OEM-E5-12 | Canister close valve (CCV) | low_side_out | — | — | — | single_source | |
| OEM-E5-5 | Vehicle speed sensor (SP2+) | digital_in | SPEEDUINO-A-18 | Proto area 5 (clutch) | digital_in | single_source | |
| OEM-E6-10 | Mass air flow (VG) | analog_in | — | — | — | single_source | |
| OEM-E6-11 | O2 right front (OXR1) | lambda_nb_in | — | — | — | single_source | |
| OEM-E6-12 | O2 left front (OXL1) | lambda_nb_in | — | — | — | single_source | |
| OEM-E6-14 | Coolant temperature (THW) | temp_in | SPEEDUINO-A-19 | Coolant temp (CLT) | temp_in | single_source | |
| OEM-E6-15 | Accelerator pedal 1 (VPA) | analog_in | SPEEDUINO-A-22 | TPS input | analog_in | single_source | |
| OEM-E6-16 | Accelerator pedal 2 (VPA2) | analog_in | — | — | — | single_source | |
| OEM-E6-17 | Power ground (E1) | ground | MAIN-R-COIL- + SPEEDUINO-A-10 + SPEEDUINO-A-9 | Relay coil negative (ECU low-side driver) + Ground + Ground | ground + load | single_source | |
| OEM-E6-18 | Sensor ground (E2) | sensor_ground | SPEEDUINO-A-12 + SPEEDUINO-A-23 | Ground + Ground | sensor_ground | single_source | |
| OEM-E6-19 | MAF ground (EVG) | sensor_ground | SPEEDUINO-A-12 + SPEEDUINO-A-23 | Ground + Ground | sensor_ground | single_source | |
| OEM-E6-2 | Sensor supply +5V (VC) | vref | SPEEDUINO-A-13 | 5V | vref | single_source | |
| OEM-E6-22 | Intake air temperature (THA) | temp_in | SPEEDUINO-A-20 | Inlet air temp (IAT) | temp_in | single_source | |
| OEM-E6-23 | Throttle position 1 (VTA) | analog_in | — | — | — | single_source | |
| OEM-E6-24 | Throttle position 2 (VTA2) | analog_in | — | — | — | single_source | |
| OEM-E6-3 | O2 heater right front (HTR) | low_side_out | — | — | — | single_source | |
| OEM-E6-4 | O2 heater left front (HTL) | low_side_out | — | — | — | single_source | |
| OEM-E6-5 | Injector 1 (#10) | injector_out | SPEEDUINO-A-1 | Injector 1 | injector_out | single_source | |
| OEM-E6-6 | Injector 2 (#20) | injector_out | SPEEDUINO-A-2 | Injector 2 | injector_out | single_source | |
| OEM-E6-7 | EVAP purge VSV (PRG) | low_side_out | — | — | — | single_source | |
| OEM-E7-1 | Injector 3 (#30) | injector_out | SPEEDUINO-A-3 | Injector 3 | injector_out | single_source | |
| OEM-E7-10 | Cam position (G2) | trigger_in | SPEEDUINO-A-24 | Cam input / VR2+ | trigger_in | single_source | |
| OEM-E7-11 | Ignition 1 (IGT) | ignition_out | SPEEDUINO-A-7 | Ignition 1 | ignition_out | single_source | |
| OEM-E7-12 | Ignition 2 (IGT2) | ignition_out | SPEEDUINO-A-34 | Ignition 2 | ignition_out | single_source | |
| OEM-E7-13 | Ignition 3 (IGT3) | ignition_out | SPEEDUINO-A-33 | Ignition 3 | ignition_out | single_source | |
| OEM-E7-17 | VVT-i OCV - (OCV-) | low_side_out | SPEEDUINO-A-15 | Proto area 2 (fan) | low_side_out | single_source | |
| OEM-E7-18 | VVT-i OCV + (OCV+) | low_side_out | SPEEDUINO-A-36 | Idle 2 (3-wire idle) | low_side_out | single_source | |
| OEM-E7-19 | ETCS throttle clutch - (CL-) | low_side_out | SPEEDUINO-A-35 | Boost | low_side_out | single_source | |
| OEM-E7-2 | Injector 4 (#40) | injector_out | SPEEDUINO-A-5 | Injector 4 | injector_out | single_source | |
| OEM-E7-20 | ETCS throttle clutch + (CL+) | low_side_out | SPEEDUINO-A-37 | PWM idle | low_side_out | single_source | |
| OEM-E7-21 | Power ground (E01) | ground | MAIN-R-COIL- + SPEEDUINO-A-10 + SPEEDUINO-A-9 | Relay coil negative (ECU low-side driver) + Ground + Ground | ground + load | single_source | |
| OEM-E7-22 | Crank position return (NE-) | sensor_ground | SPEEDUINO-A-12 + SPEEDUINO-A-23 | Ground + Ground | sensor_ground | single_source | |
| OEM-E7-23 | Crank position (NE) | trigger_in | SPEEDUINO-A-25 | Crank input / VR1+ | trigger_in | single_source | |
| OEM-E7-25 | Igniter feedback (IGF) | digital_in | — | — | — | single_source | |
| OEM-E7-27 | Knock sensor 2 (KNK2) | knock_in | — | — | — | single_source | |
| OEM-E7-28 | Knock sensor 1 (KNK1) | knock_in | — | — | — | single_source | |
| OEM-E7-3 | Injector 5 (#50) | injector_out | SPEEDUINO-A-1 | Injector 1 | injector_out | single_source | |
| OEM-E7-4 | Injector 6 (#60) | injector_out | SPEEDUINO-A-2 | Injector 2 | injector_out | single_source | |
| OEM-E7-5 | ACIS intake VSV | low_side_out | — | — | — | single_source | |
| OEM-E7-7 | ETCS throttle motor − (M−) | hbridge_out | SPEEDUINO-A-32 | Idle stepper 1B | hbridge_out | single_source | |
| OEM-E7-8 | ETCS throttle motor + (M+) | hbridge_out | SPEEDUINO-A-31 | Idle stepper 1A | hbridge_out | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-E2-13 | SP-14V-1 | 0.85 | no route | ETCS power (TBP, throttle bypass) | — | |
| W2 | OEM-E3-16 | SP-14V-1 | 0.85 | no route | EFI main relay (+B) | — | |
| W3 | OEM-E3-7 | SP-14V-1 | 0.85 | no route | ETCS main relay (+BM) | — | |
| W4 | OEM-E3-8 | SP-14V-1 | 0.85 | no route | EFI main relay (+B2) | — | |
| W5 | OEM-E3-9 | MAIN-R-COIL+ | 0.5 | no route | Ignition switch (IGSW) | — | |
| W6 | NEW-BATT-1 | MAIN-R-IN | 0.85 | no route | Relay contact input (battery + via main fuse) | — | |
| W7 | MAIN-R-COIL- | SP-GND-1 | 0.5 | no route | Relay coil negative (ECU low-side driver) | — | |
| W8 | MAIN-R-OUT | SPEEDUINO-PWR-12V | 0.85 | no route | Relay contact output (switched +12V bus) | — | |
| W9 | OEM-E6-17 | SP-GND-1 | 0.85 | no route | Power ground (E1) | — | |
| W10 | OEM-E7-21 | SP-GND-1 | 0.85 | no route | Power ground (E01) | — | |
| W11 | SP-GND-1 | SPEEDUINO-A-10 | 0.85 | no route | Ground | — | |
| W12 | SP-GND-1 | SPEEDUINO-A-9 | 0.85 | no route | Ground | — | |
| W13 | OEM-E6-18 | SP-0V-1 | 0.5 | no route | Sensor ground (E2) | — | |
| W14 | OEM-E6-19 | SP-0V-1 | 0.5 | no route | MAF ground (EVG) | — | |
| W15 | OEM-E7-22 | SP-0V-1 | 0.5 | no route | Crank position return (NE-) | — | |
| 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-E6-2 | SPEEDUINO-A-13 | 0.5 | no route | Sensor supply +5V (VC) | — | |
| W19 | OEM-E7-23 | SPEEDUINO-A-25 | 0.5 | no route | Crank position (NE) | — | |
| W20 | OEM-E7-10 | SPEEDUINO-A-24 | 0.5 | no route | Cam position (G2) | — | |
| W21 | OEM-E7-11 | SPEEDUINO-A-7 | 0.5 | no route | Ignition 1 (IGT) | — | |
| W22 | OEM-E7-12 | SPEEDUINO-A-34 | 0.5 | no route | Ignition 2 (IGT2) | — | |
| W23 | OEM-E7-13 | SPEEDUINO-A-33 | 0.5 | no route | Ignition 3 (IGT3) | — | |
| W24 | OEM-E6-5 | SPEEDUINO-A-1 | 0.5 | no route | Injector 1 (#10) | — | |
| W25 | OEM-E6-6 | SPEEDUINO-A-2 | 0.5 | no route | Injector 2 (#20) | — | |
| W26 | OEM-E7-1 | SPEEDUINO-A-3 | 0.5 | no route | Injector 3 (#30) | — | |
| W27 | OEM-E7-2 | SPEEDUINO-A-5 | 0.5 | no route | Injector 4 (#40) | — | |
| W28 | OEM-E7-3 | SPEEDUINO-A-1 | 0.5 | no route | Injector 5 (#50) | — | |
| W29 | OEM-E7-4 | SPEEDUINO-A-2 | 0.5 | no route | Injector 6 (#60) | — | |
| W30 | OEM-E7-7 | SPEEDUINO-A-32 | 0.5 | no route | ETCS throttle motor − (M−) | — | |
| W31 | OEM-E7-8 | SPEEDUINO-A-31 | 0.5 | no route | ETCS throttle motor + (M+) | — | |
| W32 | OEM-E7-17 | SPEEDUINO-A-15 | 0.5 | no route | VVT-i OCV - (OCV-) | — | |
| W33 | OEM-E7-18 | SPEEDUINO-A-36 | 0.5 | no route | VVT-i OCV + (OCV+) | — | |
| W34 | OEM-E7-19 | SPEEDUINO-A-35 | 0.5 | no route | ETCS throttle clutch - (CL-) | — | |
| W35 | OEM-E7-20 | SPEEDUINO-A-37 | 0.5 | no route | ETCS throttle clutch + (CL+) | — | |
| W36 | OEM-E6-15 | SPEEDUINO-A-22 | 0.5 | no route | Accelerator pedal 1 (VPA) | — | |
| W37 | OEM-E6-14 | SPEEDUINO-A-19 | 0.5 | no route | Coolant temperature (THW) | — | |
| W38 | OEM-E3-10 | SPEEDUINO-A-16 | 0.5 | no route | EFI main relay control (MREL) | — | |
| W39 | OEM-E3-4 | SPEEDUINO-A-38 | 0.5 | no route | Fuel pump relay (FPR) | — | |
| W40 | OEM-E2-24 | SPEEDUINO-A-21 | 0.5 | no route | O2 right rear (OXR2) | — | |
| W41 | OEM-E6-22 | SPEEDUINO-A-20 | 0.5 | no route | Intake air temperature (THA) | — | |
| W42 | OEM-E5-11 | SPEEDUINO-A-14 | 0.5 | no route | Vehicle speed sensor (SP2-) | — | |
| W43 | OEM-E5-5 | SPEEDUINO-A-18 | 0.5 | no route | Vehicle speed sensor (SP2+) | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (9)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | REQUIRED_UNMAPPED | OEM-E6-16 | Required OEM function "Accelerator pedal 2 (VPA2)" (analog_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E6-23 | Required OEM function "Throttle position 1 (VTA)" (analog_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E6-24 | Required OEM function "Throttle position 2 (VTA2)" (analog_in) 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-E7-8) 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-E7-7) nor the peak rating of SPEEDUINO-A-32 "Idle stepper 1B" is known. |
| warn | LOAD_UNKNOWN | SPEEDUINO-A-16 | SPEEDUINO-A-16 "Proto area 3 (fuel pump)" drives OEM-E3-10 EFI main relay control (MREL) (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | SPEEDUINO-A-38 | SPEEDUINO-A-38 "VVT" drives OEM-E3-4 Fuel pump relay (FPR) (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| info | NET_FAMILY | OEM-E3-9 ↔ MAIN-R-COIL+ | OEM-E3-9 "Ignition switch (IGSW)" [digital_in] is wired to MAIN-R-COIL+ "Relay coil positive (ignition-switched +12V)" [power_in]. Switched supply used as the ignition-on sense. |
| info | UNMAPPED | OEM | 23 optional OEM pins are not mapped: OEM-E2-13 ETCS power (TBP, throttle bypass); OEM-E2-25 O2 heater right rear (HTR2); OEM-E2-26 O2 heater left rear (HTL2); OEM-E3-11 Serial diagnostic (SIL); OEM-E3-5 Fuel pump control (FC); OEM-E3-6 Check-engine lamp (W); OEM-E4-13 A/C clutch relay (ACMG); OEM-E4-18 EVAP vapor pressure (PTNK); OEM-E4-2 Starter signal (STA); OEM-E4-5 Diagnostic/timing check (TC); OEM-E4-6 Stop light switch (STP); OEM-E4-8 O2 left rear (OXL2); OEM-E5-12 Canister close valve (CCV); OEM-E6-10 Mass air flow (VG); OEM-E6-11 O2 right front (OXR1); OEM-E6-12 O2 left front (OXL1); OEM-E6-3 O2 heater right front (HTR); OEM-E6-4 O2 heater left front (HTL); OEM-E6-7 EVAP purge VSV (PRG); OEM-E7-25 Igniter feedback (IGF); OEM-E7-27 Knock sensor 2 (KNK2); OEM-E7-28 Knock sensor 1 (KNK1); OEM-E7-5 ACIS intake VSV |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-E3-1 | 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 - Trigger pattern for Toyota 2JZ-GE not found in the ECU's docs (no named 12-tooth JZ decoder; the "Toyota 3 tooth cam" decoder (VVT-i) is in_development) - 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 Auto-mapped by auto_map() from the library pin data on 2026-10-20. Review every wire against both manuals before building. Open items: - OEM-E6 23: Throttle position 1 (VTA): no free tps/analog_0_5 on Speeduino Speeduino - OEM-E6 16: Accelerator pedal 2 (VPA2): no free tps/analog_0_5 on Speeduino Speeduino - OEM-E6 24: Throttle position 2 (VTA2): no free tps/analog_0_5 on Speeduino Speeduino Not wired: - OEM-E3 1: Battery constant (BATT): Speeduino Speeduino has no battery-constant memory input; not needed - OEM-E7 28: Knock sensor 1 (KNK1): no free knock input on Speeduino Speeduino - OEM-E7 27: Knock sensor 2 (KNK2): no free knock input on Speeduino Speeduino - OEM-E4 13: A/C clutch relay (ACMG): no free relay_control/low_side/heater_low_side/ls_hs/injector rated ≥ 0.2 A on Speeduino Speeduino - OEM-E2 25: O2 heater right rear (HTR2): no free heater_low_side/low_side/relay_control/ls_hs/injector on Speeduino Speeduino - OEM-E2 26: O2 heater left rear (HTL2): no free heater_low_side/low_side/relay_control/ls_hs/injector on Speeduino Speeduino - OEM-E6 3: O2 heater right front (HTR): no free heater_low_side/low_side/relay_control/ls_hs/injector on Speeduino Speeduino - OEM-E6 4: O2 heater left front (HTL): no free heater_low_side/low_side/relay_control/ls_hs/injector on Speeduino Speeduino - OEM-E3 5: Fuel pump control (FC): no free low_side/relay_control/heater_low_side/ls_hs/injector on Speeduino Speeduino - OEM-E3 6: Check-engine lamp (W): no free low_side/relay_control/heater_low_side/ls_hs/injector on Speeduino Speeduino - OEM-E5 12: Canister close valve (CCV): no free low_side/relay_control/heater_low_side/ls_hs/injector on Speeduino Speeduino - OEM-E6 7: EVAP purge VSV (PRG): no free low_side/relay_control/heater_low_side/ls_hs/injector on Speeduino Speeduino - OEM-E7 5: ACIS intake VSV: no free low_side/relay_control/heater_low_side/ls_hs/injector on Speeduino Speeduino - OEM-E6 10: Mass air flow (VG): no free maf/analog_0_5 on Speeduino Speeduino - OEM-E4 8: O2 left rear (OXL2): no free o2_narrowband/analog_0_5 on Speeduino Speeduino - OEM-E6 11: O2 right front (OXR1): no free o2_narrowband/analog_0_5 on Speeduino Speeduino - OEM-E6 12: O2 left front (OXL1): no free o2_narrowband/analog_0_5 on Speeduino Speeduino - OEM-E4 18: EVAP vapor pressure (PTNK): no free analog_0_5 on Speeduino Speeduino - OEM-E7 25: Igniter feedback (IGF): no free frequency_in/switch_in on Speeduino Speeduino - OEM-E4 2: Starter signal (STA): no free switch_in/frequency_in/analog_0_5 on Speeduino Speeduino - OEM-E4 5: Diagnostic/timing check (TC): no free switch_in/frequency_in/analog_0_5 on Speeduino Speeduino - OEM-E4 6: Stop light switch (STP): no free switch_in/frequency_in/analog_0_5 on Speeduino Speeduino - OEM-E3 11: Serial diagnostic (SIL): no free k_line on Speeduino Speeduino
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | Emtron SL4/SL6/SL8 pinout pages | https://docs.emtronaustralia.com.au/engine-management/wiring/index.html | archive | 2026-10-05 | e52b3da9996a |
| 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 |
| 4 | vendor_doc | Speeduino wiki — V0.4 board & wiring (12v input, switched power) | https://wiki.speeduino.com/en/boards/V04 | — | — | — |
| 4 | service_manual | Toyota FSM RM779U (2001 Lexus IS300) — DIAGNOSTICS 'TERMINALS OF ECM' (DI-20/21) | http://www.2jzgarage.com/wp-content/uploads/2013/04/2001_IS300_ECU_Pinouts.pdf | — | — | — |
| 3 | forum | rusEFI Mazda Miata 2002 engine wiring | https://github.com/rusefi/rusefi/wiki/Mazda-Miata-2002 | archive | 2026-10-05 | cc3cae670408 |