Lexus IS300 (XE10 / JCE10) 2001-05 2JZ-GE VVT-i → AMP EFI MS3Pro Mini (auto)
Lexus IS300 (XE10 / JCE10) 2001-05 2JZ-GE VVT-i — AMP EFI — MS3Pro Mini
⚠ 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 | 3: read the Findings page before cutting any wire |
| Size of the job | 39 wires · 10 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 | SP-14V-1 | MS3PROMINI-A-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-E6-17 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-E7-21 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | MS3PROMINI-A-22 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | MS3PROMINI-A-23 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-E6-18 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-E6-19 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-E7-22 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | SP-0V-1 | MS3PROMINI-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-E6-2 | MS3PROMINI-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-E7-23 | MS3PROMINI-A-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-E7-10 | MS3PROMINI-A-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-E7-11 | MS3PROMINI-A-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-E7-12 | MS3PROMINI-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-E7-13 | MS3PROMINI-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-E6-5 | MS3PROMINI-A-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-E6-6 | MS3PROMINI-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-E7-1 | MS3PROMINI-A-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-E7-2 | MS3PROMINI-A-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-E7-3 | MS3PROMINI-A-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-E7-4 | MS3PROMINI-A-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-E7-17 | MS3PROMINI-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-E7-18 | MS3PROMINI-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-E7-19 | MS3PROMINI-A-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-E7-20 | MS3PROMINI-A-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-E6-15 | MS3PROMINI-A-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-E6-23 | MS3PROMINI-A-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-E6-16 | MS3PROMINI-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-E6-24 | MS3PROMINI-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-E6-14 | MS3PROMINI-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-E6-10 | MS3PROMINI-A-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-E6-22 | MS3PROMINI-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-E5-11 | MS3PROMINI-A-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-E5-5 | MS3PROMINI-A-35 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-E7-25 | MS3PROMINI-A-29 | 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 | MS3PROMINI-A-1 | MS3PROMINI-A-21 | open (OL) | +12 V supply must not touch sensor ground | |
| 2 | MS3PROMINI-A-1 | MS3PROMINI-A-22 | open (OL) | +12 V supply must not touch power ground | |
| 3 | MS3PROMINI-A-1 | MS3PROMINI-A-2 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 4 | MS3PROMINI-A-21 | MS3PROMINI-A-2 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 5 | MS3PROMINI-A-22 | MS3PROMINI-A-2 | open (OL) | power 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
MS3PROMINI-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 12V+ switched power in | — | W5 | — | 0.85 | SP-14V-1 | — | — | — |
| 10 | Injector out F | — | W20 | — | 0.5 | OEM-E6-5 | — | — | — |
| 11 | Injector out G | — | W21 | — | 0.5 | OEM-E6-6 | — | — | — |
| 12 | Injector out H | — | W22 | — | 0.5 | OEM-E7-1 | — | — | — |
| 13 | Analog in 1 | — | W31 | — | 0.5 | OEM-E6-23 | — | — | — |
| 14 | Analog in 2 | — | W32 | — | 0.5 | OEM-E6-16 | — | — | — |
| 15 | Analog in 3 | — | W33 | — | 0.5 | OEM-E6-24 | — | — | — |
| 16 | Analog in 4 | — | W35 | — | 0.5 | OEM-E6-10 | — | — | — |
| 17 | Spark out A | — | W17 | — | 0.5 | OEM-E7-11 | — | — | — |
| 18 | Spark out B | — | W18 | — | 0.5 | OEM-E7-12 | — | — | — |
| 19 | Spark out C | — | W19 | — | 0.5 | OEM-E7-13 | — | — | — |
| 2 | +5V VREF out | — | W14 | — | 0.5 | OEM-E6-2 | — | — | — |
| 20 | Spark out D | — | — | — | — | — | — | — | — |
| 21 | Sensor ground | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 22 | Power ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 23 | Power ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 24 | CAN Low | — | — | — | — | — | — | — | — |
| 25 | CAN High | — | — | — | — | — | — | — | — |
| 26 | CLT in | — | W34 | — | 0.5 | OEM-E6-14 | — | — | — |
| 27 | IAT in | — | W36 | — | 0.5 | OEM-E6-22 | — | — | — |
| 28 | TPS in | — | W30 | — | 0.5 | OEM-E6-15 | — | — | — |
| 29 | Digital switched in 1 / Flex fuel | — | W39 | — | 0.5 | OEM-E7-25 | — | — | — |
| 3 | PWM out 1 / Idle | — | W26 | — | 0.5 | OEM-E7-17 | — | — | — |
| 30 | CKP+ | — | W15 | — | 0.5 | OEM-E7-23 | — | — | — |
| 31 | CKP- | — | — | — | — | — | — | — | — |
| 32 | CMP+ | — | W16 | — | 0.5 | OEM-E7-10 | — | — | — |
| 33 | CMP- | — | — | — | — | — | — | — | — |
| 34 | Digital frequency in 1 (Hall) | — | W37 | — | 0.5 | OEM-E5-11 | — | — | — |
| 35 | Digital frequency in 2 (Hall) | — | W38 | — | 0.5 | OEM-E5-5 | — | — | — |
| 4 | Fuel pump out | — | W27 | — | 0.5 | OEM-E7-18 | — | — | — |
| 5 | Injector out A | — | W23 | — | 0.5 | OEM-E7-2 | — | — | — |
| 6 | Injector out B | — | W24 | — | 0.5 | OEM-E7-3 | — | — | — |
| 7 | Injector out C | — | W25 | — | 0.5 | OEM-E7-4 | — | — | — |
| 8 | Injector out D | — | W28 | — | 0.5 | OEM-E7-19 | — | — | — |
| 9 | Injector out E | — | W29 | — | 0.5 | OEM-E7-20 | — | — | — |
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) | — | — | — | — | — | — | — | — |
| 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) | — | — | — | — | — | — | — | — |
| 11 | Serial diagnostic (SIL) | — | — | — | — | — | — | — | — |
| 16 | EFI main relay (+B) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 4 | Fuel pump relay (FPR) | — | — | — | — | — | — | — | — |
| 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) | — | — | — | — | — | — | — | — |
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-) | — | W37 | — | 0.5 | MS3PROMINI-A-34 | — | — | — |
| 12 | Canister close valve (CCV) | — | — | — | — | — | — | — | — |
| 5 | Vehicle speed sensor (SP2+) | — | W38 | — | 0.5 | MS3PROMINI-A-35 | — | — | — |
OEM-E6
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 10 | Mass air flow (VG) | — | W35 | — | 0.5 | MS3PROMINI-A-16 | — | — | — |
| 11 | O2 right front (OXR1) | — | — | — | — | — | — | — | — |
| 12 | O2 left front (OXL1) | — | — | — | — | — | — | — | — |
| 14 | Coolant temperature (THW) | — | W34 | — | 0.5 | MS3PROMINI-A-26 | — | — | — |
| 15 | Accelerator pedal 1 (VPA) | — | W30 | — | 0.5 | MS3PROMINI-A-28 | — | — | — |
| 16 | Accelerator pedal 2 (VPA2) | — | W32 | — | 0.5 | MS3PROMINI-A-14 | — | — | — |
| 17 | Power ground (E1) | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 18 | Sensor ground (E2) | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | MAF ground (EVG) | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 2 | Sensor supply +5V (VC) | — | W14 | — | 0.5 | MS3PROMINI-A-2 | — | — | — |
| 22 | Intake air temperature (THA) | — | W36 | — | 0.5 | MS3PROMINI-A-27 | — | — | — |
| 23 | Throttle position 1 (VTA) | — | W31 | — | 0.5 | MS3PROMINI-A-13 | — | — | — |
| 24 | Throttle position 2 (VTA2) | — | W33 | — | 0.5 | MS3PROMINI-A-15 | — | — | — |
| 3 | O2 heater right front (HTR) | — | — | — | — | — | — | — | — |
| 4 | O2 heater left front (HTL) | — | — | — | — | — | — | — | — |
| 5 | Injector 1 (#10) | — | W20 | — | 0.5 | MS3PROMINI-A-10 | — | — | — |
| 6 | Injector 2 (#20) | — | W21 | — | 0.5 | MS3PROMINI-A-11 | — | — | — |
| 7 | EVAP purge VSV (PRG) | — | — | — | — | — | — | — | — |
OEM-E7
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injector 3 (#30) | — | W22 | — | 0.5 | MS3PROMINI-A-12 | — | — | — |
| 10 | Cam position (G2) | — | W16 | — | 0.5 | MS3PROMINI-A-32 | — | — | — |
| 11 | Ignition 1 (IGT) | — | W17 | — | 0.5 | MS3PROMINI-A-17 | — | — | — |
| 12 | Ignition 2 (IGT2) | — | W18 | — | 0.5 | MS3PROMINI-A-18 | — | — | — |
| 13 | Ignition 3 (IGT3) | — | W19 | — | 0.5 | MS3PROMINI-A-19 | — | — | — |
| 17 | VVT-i OCV - (OCV-) | — | W26 | — | 0.5 | MS3PROMINI-A-3 | — | — | — |
| 18 | VVT-i OCV + (OCV+) | — | W27 | — | 0.5 | MS3PROMINI-A-4 | — | — | — |
| 19 | ETCS throttle clutch - (CL-) | — | W28 | — | 0.5 | MS3PROMINI-A-8 | — | — | — |
| 2 | Injector 4 (#40) | — | W23 | — | 0.5 | MS3PROMINI-A-5 | — | — | — |
| 20 | ETCS throttle clutch + (CL+) | — | W29 | — | 0.5 | MS3PROMINI-A-9 | — | — | — |
| 21 | Power ground (E01) | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 22 | Crank position return (NE-) | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 23 | Crank position (NE) | — | W15 | — | 0.5 | MS3PROMINI-A-30 | — | — | — |
| 25 | Igniter feedback (IGF) | — | W39 | — | 0.5 | MS3PROMINI-A-29 | — | — | — |
| 27 | Knock sensor 2 (KNK2) | — | — | — | — | — | — | — | — |
| 28 | Knock sensor 1 (KNK1) | — | — | — | — | — | — | — | — |
| 3 | Injector 5 (#50) | — | W24 | — | 0.5 | MS3PROMINI-A-6 | — | — | — |
| 4 | Injector 6 (#60) | — | W25 | — | 0.5 | MS3PROMINI-A-7 | — | — | — |
| 5 | ACIS intake VSV | — | — | — | — | — | — | — | — |
| 7 | ETCS throttle motor - (M-) | — | — | — | — | — | — | — | — |
| 8 | ETCS throttle motor + (M+) | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W10 | — | 0.5 | OEM-E6-18 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-E6-19 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-E7-22 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | MS3PROMINI-A-21 | — | — | — |
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 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | MS3PROMINI-A-1 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W6 | — | 0.85 | OEM-E6-17 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-E7-21 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | MS3PROMINI-A-22 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | MS3PROMINI-A-23 | — | — | — |
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 | MS3PROMINI-A-1 | 12V+ switched power in | power_in | single_source | |
| OEM-E2-24 | O2 right rear (OXR2) | 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 | — | — | — | single_source | |
| OEM-E3-11 | Serial diagnostic (SIL) | serial | — | — | — | single_source | |
| OEM-E3-16 | EFI main relay (+B) | power_in | MS3PROMINI-A-1 | 12V+ switched power in | power_in | single_source | |
| OEM-E3-4 | Fuel pump relay (FPR) | 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 | MS3PROMINI-A-1 | 12V+ switched power in | power_in | single_source | |
| OEM-E3-8 | EFI main relay (+B2) | power_in | MS3PROMINI-A-1 | 12V+ switched power in | power_in | single_source | |
| OEM-E3-9 | Ignition switch (IGSW) | digital_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 | MS3PROMINI-A-34 | Digital frequency in 1 (Hall) | 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 | MS3PROMINI-A-35 | Digital frequency in 2 (Hall) | digital_in | single_source | |
| OEM-E6-10 | Mass air flow (VG) | analog_in | MS3PROMINI-A-16 | Analog in 4 | 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 | MS3PROMINI-A-26 | CLT in | temp_in | single_source | |
| OEM-E6-15 | Accelerator pedal 1 (VPA) | analog_in | MS3PROMINI-A-28 | TPS in | analog_in | single_source | |
| OEM-E6-16 | Accelerator pedal 2 (VPA2) | analog_in | MS3PROMINI-A-14 | Analog in 2 | analog_in | single_source | |
| OEM-E6-17 | Power ground (E1) | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | single_source | |
| OEM-E6-18 | Sensor ground (E2) | sensor_ground | MS3PROMINI-A-21 | Sensor ground | sensor_ground | single_source | |
| OEM-E6-19 | MAF ground (EVG) | sensor_ground | MS3PROMINI-A-21 | Sensor ground | sensor_ground | single_source | |
| OEM-E6-2 | Sensor supply +5V (VC) | vref | MS3PROMINI-A-2 | +5V VREF out | vref | single_source | |
| OEM-E6-22 | Intake air temperature (THA) | temp_in | MS3PROMINI-A-27 | IAT in | temp_in | single_source | |
| OEM-E6-23 | Throttle position 1 (VTA) | analog_in | MS3PROMINI-A-13 | Analog in 1 | analog_in | single_source | |
| OEM-E6-24 | Throttle position 2 (VTA2) | analog_in | MS3PROMINI-A-15 | Analog in 3 | 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 | MS3PROMINI-A-10 | Injector out F | injector_out | single_source | |
| OEM-E6-6 | Injector 2 (#20) | injector_out | MS3PROMINI-A-11 | Injector out G | injector_out | single_source | |
| OEM-E6-7 | EVAP purge VSV (PRG) | low_side_out | — | — | — | single_source | |
| OEM-E7-1 | Injector 3 (#30) | injector_out | MS3PROMINI-A-12 | Injector out H | injector_out | single_source | |
| OEM-E7-10 | Cam position (G2) | trigger_in | MS3PROMINI-A-32 | CMP+ | trigger_in | single_source | |
| OEM-E7-11 | Ignition 1 (IGT) | ignition_out | MS3PROMINI-A-17 | Spark out A | ignition_out | single_source | |
| OEM-E7-12 | Ignition 2 (IGT2) | ignition_out | MS3PROMINI-A-18 | Spark out B | ignition_out | single_source | |
| OEM-E7-13 | Ignition 3 (IGT3) | ignition_out | MS3PROMINI-A-19 | Spark out C | ignition_out | single_source | |
| OEM-E7-17 | VVT-i OCV - (OCV-) | low_side_out | MS3PROMINI-A-3 | PWM out 1 / Idle | low_side_out | single_source | |
| OEM-E7-18 | VVT-i OCV + (OCV+) | low_side_out | MS3PROMINI-A-4 | Fuel pump out | low_side_out | single_source | |
| OEM-E7-19 | ETCS throttle clutch - (CL-) | low_side_out | MS3PROMINI-A-8 | Injector out D | injector_out | single_source | |
| OEM-E7-2 | Injector 4 (#40) | injector_out | MS3PROMINI-A-5 | Injector out A | injector_out | single_source | |
| OEM-E7-20 | ETCS throttle clutch + (CL+) | low_side_out | MS3PROMINI-A-9 | Injector out E | injector_out | single_source | |
| OEM-E7-21 | Power ground (E01) | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | single_source | |
| OEM-E7-22 | Crank position return (NE-) | sensor_ground | MS3PROMINI-A-21 | Sensor ground | sensor_ground | single_source | |
| OEM-E7-23 | Crank position (NE) | trigger_in | MS3PROMINI-A-30 | CKP+ | trigger_in | single_source | |
| OEM-E7-25 | Igniter feedback (IGF) | digital_in | MS3PROMINI-A-29 | Digital switched in 1 / Flex fuel | 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 | MS3PROMINI-A-6 | Injector out B | injector_out | single_source | |
| OEM-E7-4 | Injector 6 (#60) | injector_out | MS3PROMINI-A-7 | Injector out C | injector_out | single_source | |
| OEM-E7-5 | ACIS intake VSV | low_side_out | — | — | — | single_source | |
| OEM-E7-7 | ETCS throttle motor - (M-) | hbridge_out | — | — | — | single_source | |
| OEM-E7-8 | ETCS throttle motor + (M+) | 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 | SP-14V-1 | MS3PROMINI-A-1 | 0.85 | no route | 12V+ switched power in | — | |
| W6 | OEM-E6-17 | SP-GND-1 | 0.85 | no route | Power ground (E1) | — | |
| W7 | OEM-E7-21 | SP-GND-1 | 0.85 | no route | Power ground (E01) | — | |
| W8 | SP-GND-1 | MS3PROMINI-A-22 | 0.85 | no route | Power ground | — | |
| W9 | SP-GND-1 | MS3PROMINI-A-23 | 0.85 | no route | Power ground | — | |
| W10 | OEM-E6-18 | SP-0V-1 | 0.5 | no route | Sensor ground (E2) | — | |
| W11 | OEM-E6-19 | SP-0V-1 | 0.5 | no route | MAF ground (EVG) | — | |
| W12 | OEM-E7-22 | SP-0V-1 | 0.5 | no route | Crank position return (NE-) | — | |
| W13 | SP-0V-1 | MS3PROMINI-A-21 | 0.5 | no route | Sensor ground | — | |
| W14 | OEM-E6-2 | MS3PROMINI-A-2 | 0.5 | no route | Sensor supply +5V (VC) | — | |
| W15 | OEM-E7-23 | MS3PROMINI-A-30 | 0.5 | no route | Crank position (NE) | — | |
| W16 | OEM-E7-10 | MS3PROMINI-A-32 | 0.5 | no route | Cam position (G2) | — | |
| W17 | OEM-E7-11 | MS3PROMINI-A-17 | 0.5 | no route | Ignition 1 (IGT) | — | |
| W18 | OEM-E7-12 | MS3PROMINI-A-18 | 0.5 | no route | Ignition 2 (IGT2) | — | |
| W19 | OEM-E7-13 | MS3PROMINI-A-19 | 0.5 | no route | Ignition 3 (IGT3) | — | |
| W20 | OEM-E6-5 | MS3PROMINI-A-10 | 0.5 | no route | Injector 1 (#10) | — | |
| W21 | OEM-E6-6 | MS3PROMINI-A-11 | 0.5 | no route | Injector 2 (#20) | — | |
| W22 | OEM-E7-1 | MS3PROMINI-A-12 | 0.5 | no route | Injector 3 (#30) | — | |
| W23 | OEM-E7-2 | MS3PROMINI-A-5 | 0.5 | no route | Injector 4 (#40) | — | |
| W24 | OEM-E7-3 | MS3PROMINI-A-6 | 0.5 | no route | Injector 5 (#50) | — | |
| W25 | OEM-E7-4 | MS3PROMINI-A-7 | 0.5 | no route | Injector 6 (#60) | — | |
| W26 | OEM-E7-17 | MS3PROMINI-A-3 | 0.5 | no route | VVT-i OCV - (OCV-) | — | |
| W27 | OEM-E7-18 | MS3PROMINI-A-4 | 0.5 | no route | VVT-i OCV + (OCV+) | — | |
| W28 | OEM-E7-19 | MS3PROMINI-A-8 | 0.5 | no route | ETCS throttle clutch - (CL-) | — | |
| W29 | OEM-E7-20 | MS3PROMINI-A-9 | 0.5 | no route | ETCS throttle clutch + (CL+) | — | |
| W30 | OEM-E6-15 | MS3PROMINI-A-28 | 0.5 | no route | Accelerator pedal 1 (VPA) | — | |
| W31 | OEM-E6-23 | MS3PROMINI-A-13 | 0.5 | no route | Throttle position 1 (VTA) | — | |
| W32 | OEM-E6-16 | MS3PROMINI-A-14 | 0.5 | no route | Accelerator pedal 2 (VPA2) | — | |
| W33 | OEM-E6-24 | MS3PROMINI-A-15 | 0.5 | no route | Throttle position 2 (VTA2) | — | |
| W34 | OEM-E6-14 | MS3PROMINI-A-26 | 0.5 | no route | Coolant temperature (THW) | — | |
| W35 | OEM-E6-10 | MS3PROMINI-A-16 | 0.5 | no route | Mass air flow (VG) | — | |
| W36 | OEM-E6-22 | MS3PROMINI-A-27 | 0.5 | no route | Intake air temperature (THA) | — | |
| W37 | OEM-E5-11 | MS3PROMINI-A-34 | 0.5 | no route | Vehicle speed sensor (SP2-) | — | |
| W38 | OEM-E5-5 | MS3PROMINI-A-35 | 0.5 | no route | Vehicle speed sensor (SP2+) | — | |
| W39 | OEM-E7-25 | MS3PROMINI-A-29 | 0.5 | no route | Igniter feedback (IGF) | — |
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 (6)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | REQUIRED_UNMAPPED | OEM-E3-9 | Required OEM function "Ignition switch (IGSW)" (digital_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E7-7 | Required OEM function "ETCS throttle motor - (M-)" (hbridge_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E7-8 | Required OEM function "ETCS throttle motor + (M+)" (hbridge_out) is not connected to the new ECU. |
| info | NET_FAMILY | OEM-E7-19 ↔ MS3PROMINI-A-8 | OEM-E7-19 "ETCS throttle clutch - (CL-)" [low_side_out] is wired to MS3PROMINI-A-8 "Injector out D" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-E7-20 ↔ MS3PROMINI-A-9 | OEM-E7-20 "ETCS throttle clutch + (CL+)" [low_side_out] is wired to MS3PROMINI-A-9 "Injector out E" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | UNMAPPED | OEM | 23 optional OEM pins are not mapped: OEM-E2-24 O2 right rear (OXR2); OEM-E2-25 O2 heater right rear (HTR2); OEM-E2-26 O2 heater left rear (HTL2); OEM-E3-10 EFI main relay control (MREL); OEM-E3-11 Serial diagnostic (SIL); OEM-E3-4 Fuel pump relay (FPR); 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-E6-11 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-E7-27 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: - Drive-by-wire only with an add-on: AMP Drive-By-Wire Controller - No knock input; the stock knock sensor would be unused - Only 4 ignition outputs for 6 cylinders: wasted spark (pair coils per firing order) Auto-mapped by auto_map() from the library pin data on 2026-10-11. Review every wire against both manuals before building. Open items: - OEM-E3 9: Ignition switch (IGSW): key-on 12 V sense — optional in a swap (the main relay is energized from keyed 12 V, not from this pin); AMP EFI MS3Pro Mini has no dedicated key-on input - OEM-E7 7: ETCS throttle motor - (M-): no +/− pair in the pinout (multi-phase or half-documented motor); wire by hand - OEM-E7 8: ETCS throttle motor + (M+): no +/− pair in the pinout (multi-phase or half-documented motor); wire by hand Not wired: - OEM-E3 1: Battery constant (BATT): AMP EFI MS3Pro Mini has no battery-constant input; not needed - OEM-E7 28: Knock sensor 1 (KNK1): no free knock input on AMP EFI MS3Pro Mini - OEM-E7 27: Knock sensor 2 (KNK2): no free knock input on AMP EFI MS3Pro Mini - OEM-E3 10: EFI main relay control (MREL): no free relay_control/low_side/heater_low_side/ls_hs/injector rated ≥ 0.2 A on AMP EFI MS3Pro Mini - OEM-E3 4: Fuel pump relay (FPR): no free relay_control/low_side/heater_low_side/ls_hs/injector rated ≥ 0.2 A on AMP EFI MS3Pro Mini - 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 AMP EFI MS3Pro Mini - OEM-E2 25: O2 heater right rear (HTR2): no free heater_low_side/low_side/relay_control/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-E2 26: O2 heater left rear (HTL2): no free heater_low_side/low_side/relay_control/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-E6 3: O2 heater right front (HTR): no free heater_low_side/low_side/relay_control/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-E6 4: O2 heater left front (HTL): no free heater_low_side/low_side/relay_control/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-E3 5: Fuel pump control (FC): no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-E3 6: Check-engine lamp (W): no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-E5 12: Canister close valve (CCV): no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-E6 7: EVAP purge VSV (PRG): no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-E7 5: ACIS intake VSV: no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-E2 24: O2 right rear (OXR2): no free o2_narrowband/analog_0_5 on AMP EFI MS3Pro Mini - OEM-E4 8: O2 left rear (OXL2): no free o2_narrowband/analog_0_5 on AMP EFI MS3Pro Mini - OEM-E6 11: O2 right front (OXR1): no free o2_narrowband/analog_0_5 on AMP EFI MS3Pro Mini - OEM-E6 12: O2 left front (OXL1): no free o2_narrowband/analog_0_5 on AMP EFI MS3Pro Mini - OEM-E4 18: EVAP vapor pressure (PTNK): no free analog_0_5 on AMP EFI MS3Pro Mini - OEM-E4 2: Starter signal (STA): no free switch_in/frequency_in/analog_0_5 on AMP EFI MS3Pro Mini - OEM-E4 5: Diagnostic/timing check (TC): no free switch_in/frequency_in/analog_0_5 on AMP EFI MS3Pro Mini - OEM-E4 6: Stop light switch (STP): no free switch_in/frequency_in/analog_0_5 on AMP EFI MS3Pro Mini - OEM-E3 11: Serial diagnostic (SIL): no free k_line on AMP EFI MS3Pro Mini
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | AMP EFI: MS3Pro Mini manual (fw 1.6.1) pinout & output ratings | https://cdn.shopify.com/s/files/1/0960/0014/7754/files/MS3Pro_User_Manual_Firmware_1.6.1_Mini.pdf?v=1760643335 | archive | 2026-10-05 | bed7d8ae8408 |
| 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 | — | — | — |