Lexus LS400 1998-2000 (1UZ-FE VVT-i) → AMP EFI MS3Pro Mini (auto)
Lexus LS400 1998-2000 (1UZ-FE 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 | 9: read the Findings page before cutting any wire |
| Size of the job | 42 wires · 9 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-E15-16 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-E15-7 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-E15-8 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | SP-14V-1 | MS3PROMINI-A-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-E13-17 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-E14-21 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-GND-1 | MS3PROMINI-A-22 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | MS3PROMINI-A-23 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-E13-18 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-E13-19 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-0V-1 | MS3PROMINI-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-E13-2 | MS3PROMINI-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-E14-23 | MS3PROMINI-A-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-E14-22 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-E14-10 | MS3PROMINI-A-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-E13-16 | MS3PROMINI-A-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-E13-24 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-E13-15 | MS3PROMINI-A-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-E13-23 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-E14-11 | MS3PROMINI-A-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-E14-12 | MS3PROMINI-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-E14-13 | MS3PROMINI-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-E14-14 | MS3PROMINI-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-E13-5 | MS3PROMINI-A-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-E13-6 | MS3PROMINI-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-E14-1 | MS3PROMINI-A-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-E14-2 | MS3PROMINI-A-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-E14-3 | MS3PROMINI-A-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-E14-4 | MS3PROMINI-A-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-E14-5 | MS3PROMINI-A-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-E14-6 | MS3PROMINI-A-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-E11-19 | MS3PROMINI-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-E14-20 | MS3PROMINI-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-E13-10 | MS3PROMINI-A-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-E13-13 | MS3PROMINI-A-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-E13-21 | MS3PROMINI-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-E13-20 | MS3PROMINI-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-E13-9 | MS3PROMINI-A-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-E13-14 | MS3PROMINI-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-E13-22 | MS3PROMINI-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-E14-27 | MS3PROMINI-A-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-E14-28 | MS3PROMINI-A-35 | 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-2 | MS3PROMINI-A-1 | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 2 | MS3PROMINI-A-21 | MS3PROMINI-A-1 | open (OL) | sensor ground must not touch +12 V supply | |
| 3 | MS3PROMINI-A-21 | MS3PROMINI-A-2 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 4 | MS3PROMINI-A-22 | MS3PROMINI-A-1 | open (OL) | power ground must not touch +12 V supply | |
| 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 | — | W4 | — | 0.85 | SP-14V-1 | — | — | — |
| 10 | Injector out F | — | W24 | — | 0.5 | OEM-E13-5 | — | — | — |
| 11 | Injector out G | — | W25 | — | 0.5 | OEM-E13-6 | — | — | — |
| 12 | Injector out H | — | W26 | — | 0.5 | OEM-E14-1 | — | — | — |
| 13 | Analog in 1 | — | W34 | — | 0.5 | OEM-E13-10 | — | — | — |
| 14 | Analog in 2 | — | W36 | — | 0.5 | OEM-E13-21 | — | — | — |
| 15 | Analog in 3 | — | W37 | — | 0.5 | OEM-E13-20 | — | — | — |
| 16 | Analog in 4 | — | W38 | — | 0.5 | OEM-E13-9 | — | — | — |
| 17 | Spark out A | — | W20 | — | 0.5 | OEM-E14-11 | — | — | — |
| 18 | Spark out B | — | W21 | — | 0.5 | OEM-E14-12 | — | — | — |
| 19 | Spark out C | — | W22 | — | 0.5 | OEM-E14-13 | — | — | — |
| 2 | +5V VREF out | — | W12 | — | 0.5 | OEM-E13-2 | — | — | — |
| 20 | Spark out D | — | W23 | — | 0.5 | OEM-E14-14 | — | — | — |
| 21 | Sensor ground | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 22 | Power ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 23 | Power ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 24 | CAN Low | — | — | — | — | — | — | — | — |
| 25 | CAN High | — | — | — | — | — | — | — | — |
| 26 | CLT in | — | W39 | — | 0.5 | OEM-E13-14 | — | — | — |
| 27 | IAT in | — | W40 | — | 0.5 | OEM-E13-22 | — | — | — |
| 28 | TPS in | — | W35 | — | 0.5 | OEM-E13-13 | — | — | — |
| 29 | Digital switched in 1 / Flex fuel | — | W41 | — | 0.5 | OEM-E14-27 | — | — | — |
| 3 | PWM out 1 / Idle | — | W32 | — | 0.5 | OEM-E11-19 | — | — | — |
| 30 | CKP+ | — | W13 | — | 0.5 | OEM-E14-23 | — | — | — |
| 31 | CKP- | — | — | — | — | — | — | — | — |
| 32 | CMP+ | — | W15 | — | 0.5 | OEM-E14-10 | — | — | — |
| 33 | CMP- | — | W16 | — | 0.5 | OEM-E13-16 | — | — | — |
| 34 | Digital frequency in 1 (Hall) | — | W18 | — | 0.5 | OEM-E13-15 | — | — | — |
| 35 | Digital frequency in 2 (Hall) | — | W42 | — | 0.5 | OEM-E14-28 | — | — | — |
| 4 | Fuel pump out | — | W33 | — | 0.5 | OEM-E14-20 | — | — | — |
| 5 | Injector out A | — | W27 | — | 0.5 | OEM-E14-2 | — | — | — |
| 6 | Injector out B | — | W28 | — | 0.5 | OEM-E14-3 | — | — | — |
| 7 | Injector out C | — | W29 | — | 0.5 | OEM-E14-4 | — | — | — |
| 8 | Injector out D | — | W30 | — | 0.5 | OEM-E14-5 | — | — | — |
| 9 | Injector out E | — | W31 | — | 0.5 | OEM-E14-6 | — | — | — |
OEM-E11
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 17 | Starter signal (STA) | — | — | — | — | — | — | — | — |
| 18 | O2 sensor signal (bank unconfirmed) | — | — | — | — | — | — | — | — |
| 19 | VVT oil-control valve RH (OCR+) | — | W32 | — | 0.5 | MS3PROMINI-A-3 | — | — | — |
| 27 | O2 sensor signal (bank unconfirmed) | — | — | — | — | — | — | — | — |
| 28 | VVT oil-control valve RH (OCR−) | — | — | — | — | — | — | — | — |
| 5 | Diagnostic test (TC) | — | — | — | — | — | — | — | — |
| 7 | O2 sensor heater (bank unconfirmed) | — | — | — | — | — | — | — | — |
| 8 | O2 sensor heater (bank unconfirmed) | — | — | — | — | — | — | — | — |
OEM-E12
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 12 | Throttle magnetic clutch + (CL+) | — | — | — | — | — | — | — | — |
OEM-E13
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 10 | MAF signal (VG) | — | W34 | — | 0.5 | MS3PROMINI-A-13 | — | — | — |
| 11 | O2 sensor signal (bank unconfirmed) | — | — | — | — | — | — | — | — |
| 12 | O2 sensor signal (bank unconfirmed) | — | — | — | — | — | — | — | — |
| 13 | Throttle position sensor 1 (VTA) | — | W35 | — | 0.5 | MS3PROMINI-A-28 | — | — | — |
| 14 | Engine coolant temp (THW) | — | W39 | — | 0.5 | MS3PROMINI-A-26 | — | — | — |
| 15 | VVT position sensor RH (VVR+) | — | W18 | — | 0.5 | MS3PROMINI-A-34 | — | — | — |
| 16 | VVT position sensor LH (VVL+) | — | W16 | — | 0.5 | MS3PROMINI-A-33 | — | — | — |
| 17 | ECU ground (E1) | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 18 | Sensor ground (E2) | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | MAF ground (EVG) | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 2 | +5V sensor reference (VC) | — | W12 | — | 0.5 | MS3PROMINI-A-2 | — | — | — |
| 20 | Throttle position sensor 2 (VTA2) | — | W37 | — | 0.5 | MS3PROMINI-A-15 | — | — | — |
| 21 | Accelerator pedal position 1 (VPA) | — | W36 | — | 0.5 | MS3PROMINI-A-14 | — | — | — |
| 22 | Intake air temp (THA) | — | W40 | — | 0.5 | MS3PROMINI-A-27 | — | — | — |
| 23 | VVT position sensor RH (VVR−) | — | W19 | — | 0.5 | SP-0V-1 | — | — | — |
| 24 | VVT position sensor LH (VVL−) | — | W17 | — | 0.5 | SP-0V-1 | — | — | — |
| 3 | O2 sensor heater (bank unconfirmed) | — | — | — | — | — | — | — | — |
| 4 | O2 sensor heater (bank unconfirmed) | — | — | — | — | — | — | — | — |
| 5 | Injector 1 (cyl 1) | — | W24 | — | 0.5 | MS3PROMINI-A-10 | — | — | — |
| 6 | Injector 2 (cyl 2) | — | W25 | — | 0.5 | MS3PROMINI-A-11 | — | — | — |
| 8 | Throttle magnetic clutch − (CL−) | — | — | — | — | — | — | — | — |
| 9 | Accelerator pedal position 2 (VPA2) | — | W38 | — | 0.5 | MS3PROMINI-A-16 | — | — | — |
OEM-E14
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injector 3 (cyl 3) | — | W26 | — | 0.5 | MS3PROMINI-A-12 | — | — | — |
| 10 | Camshaft position sensor (G2) | — | W15 | — | 0.5 | MS3PROMINI-A-32 | — | — | — |
| 11 | Ignition coil 1 (IGT1) | — | W20 | — | 0.5 | MS3PROMINI-A-17 | — | — | — |
| 12 | Ignition coil 2 (IGT2) | — | W21 | — | 0.5 | MS3PROMINI-A-18 | — | — | — |
| 13 | Ignition coil 3 (IGT3) | — | W22 | — | 0.5 | MS3PROMINI-A-19 | — | — | — |
| 14 | Ignition coil 4 (IGT4) | — | W23 | — | 0.5 | MS3PROMINI-A-20 | — | — | — |
| 15 | Ignition coil 5 (IGT5) | — | — | — | — | — | — | — | — |
| 16 | Ignition coil 6 (IGT6) | — | — | — | — | — | — | — | — |
| 17 | Knock sensor RH (KNKR) | — | — | — | — | — | — | — | — |
| 18 | Knock sensor LH (KNKL) | — | — | — | — | — | — | — | — |
| 19 | VVT oil-control valve LH (OCV−) | — | — | — | — | — | — | — | — |
| 2 | Injector 4 (cyl 4) | — | W27 | — | 0.5 | MS3PROMINI-A-5 | — | — | — |
| 20 | VVT oil-control valve LH (OCV+) | — | W33 | — | 0.5 | MS3PROMINI-A-4 | — | — | — |
| 21 | Power/injector ground (E01) | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 22 | Crank position sensor (NE−) | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 23 | Crank position sensor (NE+) | — | W13 | — | 0.5 | MS3PROMINI-A-30 | — | — | — |
| 25 | Ignition coil 7 (IGT7) | — | — | — | — | — | — | — | — |
| 26 | Ignition coil 8 (IGT8) | — | — | — | — | — | — | — | — |
| 27 | Ignition confirmation 1 (IGF1) | — | W41 | — | 0.5 | MS3PROMINI-A-29 | — | — | — |
| 28 | Ignition confirmation 2 (IGF2) | — | W42 | — | 0.5 | MS3PROMINI-A-35 | — | — | — |
| 29 | ACIS induction VSV | — | — | — | — | — | — | — | — |
| 3 | Injector 5 (cyl 5) | — | W28 | — | 0.5 | MS3PROMINI-A-6 | — | — | — |
| 4 | Injector 6 (cyl 6) | — | W29 | — | 0.5 | MS3PROMINI-A-7 | — | — | — |
| 5 | Injector 7 (cyl 7) | — | W30 | — | 0.5 | MS3PROMINI-A-8 | — | — | — |
| 6 | Injector 8 (cyl 8) | — | W31 | — | 0.5 | MS3PROMINI-A-9 | — | — | — |
| 7 | Throttle motor − (M−) | — | — | — | — | — | — | — | — |
| 8 | Throttle motor + (M+) | — | — | — | — | — | — | — | — |
OEM-E15
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Battery constant (+12V) | — | — | — | — | — | — | — | — |
| 10 | EFI main relay control (MREL) | — | — | — | — | — | — | — | — |
| 11 | OBD-II / DLC3 data (SIL) | — | — | — | — | — | — | — | — |
| 16 | ECM power (EFI relay +B) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 5 | Fuel pump relay control (FC) | — | — | — | — | — | — | — | — |
| 6 | Check engine light (W) | — | — | — | — | — | — | — | — |
| 7 | ECM power feed (+BM) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 8 | ECM power (EFI relay +B1) | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 9 | Ignition switch (+12V) | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W9 | — | 0.5 | OEM-E13-18 | — | — | — |
| 1 | — | — | W10 | — | 0.5 | OEM-E13-19 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | MS3PROMINI-A-21 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | OEM-E14-22 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | OEM-E13-24 | — | — | — |
| 1 | — | — | W19 | — | 0.5 | OEM-E13-23 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-E15-16 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-E15-7 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | OEM-E15-8 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | MS3PROMINI-A-1 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W5 | — | 0.85 | OEM-E13-17 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-E14-21 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | MS3PROMINI-A-22 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | MS3PROMINI-A-23 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-E11-17 | Starter signal (STA) | digital_in | — | — | — | corroborated | |
| OEM-E11-18 | O2 sensor signal (bank unconfirmed) | lambda_nb_in | — | — | — | corroborated | |
| OEM-E11-19 | VVT oil-control valve RH (OCR+) | low_side_out | MS3PROMINI-A-3 | PWM out 1 / Idle | low_side_out | corroborated | |
| OEM-E11-27 | O2 sensor signal (bank unconfirmed) | lambda_nb_in | — | — | — | corroborated | |
| OEM-E11-28 | VVT oil-control valve RH (OCR−) | low_side_out | — | — | — | corroborated | |
| OEM-E11-5 | Diagnostic test (TC) | serial | — | — | — | corroborated | |
| OEM-E11-7 | O2 sensor heater (bank unconfirmed) | low_side_out | — | — | — | corroborated | |
| OEM-E11-8 | O2 sensor heater (bank unconfirmed) | low_side_out | — | — | — | corroborated | |
| OEM-E12-12 | Throttle magnetic clutch + (CL+) | low_side_out | — | — | — | corroborated | |
| OEM-E13-10 | MAF signal (VG) | analog_in | MS3PROMINI-A-13 | Analog in 1 | analog_in | corroborated | |
| OEM-E13-11 | O2 sensor signal (bank unconfirmed) | lambda_nb_in | — | — | — | corroborated | |
| OEM-E13-12 | O2 sensor signal (bank unconfirmed) | lambda_nb_in | — | — | — | corroborated | |
| OEM-E13-13 | Throttle position sensor 1 (VTA) | analog_in | MS3PROMINI-A-28 | TPS in | analog_in | corroborated | |
| OEM-E13-14 | Engine coolant temp (THW) | temp_in | MS3PROMINI-A-26 | CLT in | temp_in | corroborated | |
| OEM-E13-15 | VVT position sensor RH (VVR+) | trigger_in | MS3PROMINI-A-34 | Digital frequency in 1 (Hall) | digital_in | corroborated | |
| OEM-E13-16 | VVT position sensor LH (VVL+) | trigger_in | MS3PROMINI-A-33 | CMP- | trigger_in | corroborated | |
| OEM-E13-17 | ECU ground (E1) | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | corroborated | |
| OEM-E13-18 | Sensor ground (E2) | sensor_ground | MS3PROMINI-A-21 | Sensor ground | sensor_ground | corroborated | |
| OEM-E13-19 | MAF ground (EVG) | sensor_ground | MS3PROMINI-A-21 | Sensor ground | sensor_ground | corroborated | |
| OEM-E13-2 | +5V sensor reference (VC) | vref | MS3PROMINI-A-2 | +5V VREF out | vref | corroborated | |
| OEM-E13-20 | Throttle position sensor 2 (VTA2) | analog_in | MS3PROMINI-A-15 | Analog in 3 | analog_in | corroborated | |
| OEM-E13-21 | Accelerator pedal position 1 (VPA) | analog_in | MS3PROMINI-A-14 | Analog in 2 | analog_in | corroborated | |
| OEM-E13-22 | Intake air temp (THA) | temp_in | MS3PROMINI-A-27 | IAT in | temp_in | corroborated | |
| OEM-E13-23 | VVT position sensor RH (VVR−) | trigger_in | MS3PROMINI-A-21 | Sensor ground | sensor_ground | corroborated | |
| OEM-E13-24 | VVT position sensor LH (VVL−) | trigger_in | MS3PROMINI-A-21 | Sensor ground | sensor_ground | corroborated | |
| OEM-E13-3 | O2 sensor heater (bank unconfirmed) | low_side_out | — | — | — | corroborated | |
| OEM-E13-4 | O2 sensor heater (bank unconfirmed) | low_side_out | — | — | — | corroborated | |
| OEM-E13-5 | Injector 1 (cyl 1) | injector_out | MS3PROMINI-A-10 | Injector out F | injector_out | corroborated | |
| OEM-E13-6 | Injector 2 (cyl 2) | injector_out | MS3PROMINI-A-11 | Injector out G | injector_out | corroborated | |
| OEM-E13-8 | Throttle magnetic clutch − (CL−) | low_side_out | — | — | — | corroborated | |
| OEM-E13-9 | Accelerator pedal position 2 (VPA2) | analog_in | MS3PROMINI-A-16 | Analog in 4 | analog_in | corroborated | |
| OEM-E14-1 | Injector 3 (cyl 3) | injector_out | MS3PROMINI-A-12 | Injector out H | injector_out | corroborated | |
| OEM-E14-10 | Camshaft position sensor (G2) | trigger_in | MS3PROMINI-A-32 | CMP+ | trigger_in | corroborated | |
| OEM-E14-11 | Ignition coil 1 (IGT1) | ignition_out | MS3PROMINI-A-17 | Spark out A | ignition_out | corroborated | |
| OEM-E14-12 | Ignition coil 2 (IGT2) | ignition_out | MS3PROMINI-A-18 | Spark out B | ignition_out | corroborated | |
| OEM-E14-13 | Ignition coil 3 (IGT3) | ignition_out | MS3PROMINI-A-19 | Spark out C | ignition_out | corroborated | |
| OEM-E14-14 | Ignition coil 4 (IGT4) | ignition_out | MS3PROMINI-A-20 | Spark out D | ignition_out | corroborated | |
| OEM-E14-15 | Ignition coil 5 (IGT5) | ignition_out | — | — | — | corroborated | |
| OEM-E14-16 | Ignition coil 6 (IGT6) | ignition_out | — | — | — | corroborated | |
| OEM-E14-17 | Knock sensor RH (KNKR) | knock_in | — | — | — | corroborated | |
| OEM-E14-18 | Knock sensor LH (KNKL) | knock_in | — | — | — | corroborated | |
| OEM-E14-19 | VVT oil-control valve LH (OCV−) | low_side_out | — | — | — | corroborated | |
| OEM-E14-2 | Injector 4 (cyl 4) | injector_out | MS3PROMINI-A-5 | Injector out A | injector_out | corroborated | |
| OEM-E14-20 | VVT oil-control valve LH (OCV+) | low_side_out | MS3PROMINI-A-4 | Fuel pump out | low_side_out | corroborated | |
| OEM-E14-21 | Power/injector ground (E01) | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | corroborated | |
| OEM-E14-22 | Crank position sensor (NE−) | trigger_in | MS3PROMINI-A-21 | Sensor ground | sensor_ground | corroborated | |
| OEM-E14-23 | Crank position sensor (NE+) | trigger_in | MS3PROMINI-A-30 | CKP+ | trigger_in | corroborated | |
| OEM-E14-25 | Ignition coil 7 (IGT7) | ignition_out | — | — | — | corroborated | |
| OEM-E14-26 | Ignition coil 8 (IGT8) | ignition_out | — | — | — | corroborated | |
| OEM-E14-27 | Ignition confirmation 1 (IGF1) | digital_in | MS3PROMINI-A-29 | Digital switched in 1 / Flex fuel | digital_in | corroborated | |
| OEM-E14-28 | Ignition confirmation 2 (IGF2) | digital_in | MS3PROMINI-A-35 | Digital frequency in 2 (Hall) | digital_in | corroborated | |
| OEM-E14-29 | ACIS induction VSV | low_side_out | — | — | — | corroborated | |
| OEM-E14-3 | Injector 5 (cyl 5) | injector_out | MS3PROMINI-A-6 | Injector out B | injector_out | corroborated | |
| OEM-E14-4 | Injector 6 (cyl 6) | injector_out | MS3PROMINI-A-7 | Injector out C | injector_out | corroborated | |
| OEM-E14-5 | Injector 7 (cyl 7) | injector_out | MS3PROMINI-A-8 | Injector out D | injector_out | corroborated | |
| OEM-E14-6 | Injector 8 (cyl 8) | injector_out | MS3PROMINI-A-9 | Injector out E | injector_out | corroborated | |
| OEM-E14-7 | Throttle motor − (M−) | hbridge_out | — | — | — | corroborated | |
| OEM-E14-8 | Throttle motor + (M+) | hbridge_out | — | — | — | corroborated | |
| OEM-E15-1 | Battery constant (+12V) | power_in | — | — | — | corroborated | |
| OEM-E15-10 | EFI main relay control (MREL) | low_side_out | — | — | — | corroborated | |
| OEM-E15-11 | OBD-II / DLC3 data (SIL) | serial | — | — | — | corroborated | |
| OEM-E15-16 | ECM power (EFI relay +B) | power_in | MS3PROMINI-A-1 | 12V+ switched power in | power_in | corroborated | |
| OEM-E15-5 | Fuel pump relay control (FC) | low_side_out | — | — | — | corroborated | |
| OEM-E15-6 | Check engine light (W) | low_side_out | — | — | — | corroborated | |
| OEM-E15-7 | ECM power feed (+BM) | power_in | MS3PROMINI-A-1 | 12V+ switched power in | power_in | corroborated | |
| OEM-E15-8 | ECM power (EFI relay +B1) | power_in | MS3PROMINI-A-1 | 12V+ switched power in | power_in | corroborated | |
| OEM-E15-9 | Ignition switch (+12V) | digital_in | — | — | — | corroborated |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-E15-16 | SP-14V-1 | 0.85 | no route | ECM power (EFI relay +B) | — | |
| W2 | OEM-E15-7 | SP-14V-1 | 0.85 | no route | ECM power feed (+BM) | — | |
| W3 | OEM-E15-8 | SP-14V-1 | 0.85 | no route | ECM power (EFI relay +B1) | — | |
| W4 | SP-14V-1 | MS3PROMINI-A-1 | 0.85 | no route | 12V+ switched power in | — | |
| W5 | OEM-E13-17 | SP-GND-1 | 0.85 | no route | ECU ground (E1) | — | |
| W6 | OEM-E14-21 | SP-GND-1 | 0.85 | no route | Power/injector ground (E01) | — | |
| W7 | SP-GND-1 | MS3PROMINI-A-22 | 0.85 | no route | Power ground | — | |
| W8 | SP-GND-1 | MS3PROMINI-A-23 | 0.85 | no route | Power ground | — | |
| W9 | OEM-E13-18 | SP-0V-1 | 0.5 | no route | Sensor ground (E2) | — | |
| W10 | OEM-E13-19 | SP-0V-1 | 0.5 | no route | MAF ground (EVG) | — | |
| W11 | SP-0V-1 | MS3PROMINI-A-21 | 0.5 | no route | Sensor ground | — | |
| W12 | OEM-E13-2 | MS3PROMINI-A-2 | 0.5 | no route | +5V sensor reference (VC) | — | |
| W13 | OEM-E14-23 | MS3PROMINI-A-30 | 0.5 | no route | Crank position sensor (NE+) | — | |
| W14 | OEM-E14-22 | SP-0V-1 | 0.5 | no route | Crank position sensor (NE−) | — | |
| W15 | OEM-E14-10 | MS3PROMINI-A-32 | 0.5 | no route | Camshaft position sensor (G2) | — | |
| W16 | OEM-E13-16 | MS3PROMINI-A-33 | 0.5 | no route | VVT position sensor LH (VVL+) | — | |
| W17 | OEM-E13-24 | SP-0V-1 | 0.5 | no route | VVT position sensor LH (VVL−) | — | |
| W18 | OEM-E13-15 | MS3PROMINI-A-34 | 0.5 | no route | VVT position sensor RH (VVR+) | — | |
| W19 | OEM-E13-23 | SP-0V-1 | 0.5 | no route | VVT position sensor RH (VVR−) | — | |
| W20 | OEM-E14-11 | MS3PROMINI-A-17 | 0.5 | no route | Ignition coil 1 (IGT1) | — | |
| W21 | OEM-E14-12 | MS3PROMINI-A-18 | 0.5 | no route | Ignition coil 2 (IGT2) | — | |
| W22 | OEM-E14-13 | MS3PROMINI-A-19 | 0.5 | no route | Ignition coil 3 (IGT3) | — | |
| W23 | OEM-E14-14 | MS3PROMINI-A-20 | 0.5 | no route | Ignition coil 4 (IGT4) | — | |
| W24 | OEM-E13-5 | MS3PROMINI-A-10 | 0.5 | no route | Injector 1 (cyl 1) | — | |
| W25 | OEM-E13-6 | MS3PROMINI-A-11 | 0.5 | no route | Injector 2 (cyl 2) | — | |
| W26 | OEM-E14-1 | MS3PROMINI-A-12 | 0.5 | no route | Injector 3 (cyl 3) | — | |
| W27 | OEM-E14-2 | MS3PROMINI-A-5 | 0.5 | no route | Injector 4 (cyl 4) | — | |
| W28 | OEM-E14-3 | MS3PROMINI-A-6 | 0.5 | no route | Injector 5 (cyl 5) | — | |
| W29 | OEM-E14-4 | MS3PROMINI-A-7 | 0.5 | no route | Injector 6 (cyl 6) | — | |
| W30 | OEM-E14-5 | MS3PROMINI-A-8 | 0.5 | no route | Injector 7 (cyl 7) | — | |
| W31 | OEM-E14-6 | MS3PROMINI-A-9 | 0.5 | no route | Injector 8 (cyl 8) | — | |
| W32 | OEM-E11-19 | MS3PROMINI-A-3 | 0.5 | no route | VVT oil-control valve RH (OCR+) | — | |
| W33 | OEM-E14-20 | MS3PROMINI-A-4 | 0.5 | no route | VVT oil-control valve LH (OCV+) | — | |
| W34 | OEM-E13-10 | MS3PROMINI-A-13 | 0.5 | no route | MAF signal (VG) | — | |
| W35 | OEM-E13-13 | MS3PROMINI-A-28 | 0.5 | no route | Throttle position sensor 1 (VTA) | — | |
| W36 | OEM-E13-21 | MS3PROMINI-A-14 | 0.5 | no route | Accelerator pedal position 1 (VPA) | — | |
| W37 | OEM-E13-20 | MS3PROMINI-A-15 | 0.5 | no route | Throttle position sensor 2 (VTA2) | — | |
| W38 | OEM-E13-9 | MS3PROMINI-A-16 | 0.5 | no route | Accelerator pedal position 2 (VPA2) | — | |
| W39 | OEM-E13-14 | MS3PROMINI-A-26 | 0.5 | no route | Engine coolant temp (THW) | — | |
| W40 | OEM-E13-22 | MS3PROMINI-A-27 | 0.5 | no route | Intake air temp (THA) | — | |
| W41 | OEM-E14-27 | MS3PROMINI-A-29 | 0.5 | no route | Ignition confirmation 1 (IGF1) | — | |
| W42 | OEM-E14-28 | MS3PROMINI-A-35 | 0.5 | no route | Ignition confirmation 2 (IGF2) | — |
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 (12)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | REQUIRED_UNMAPPED | OEM-E14-15 | Required OEM function "Ignition coil 5 (IGT5)" (ignition_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E14-16 | Required OEM function "Ignition coil 6 (IGT6)" (ignition_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E14-17 | Required OEM function "Knock sensor RH (KNKR)" (knock_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E14-18 | Required OEM function "Knock sensor LH (KNKL)" (knock_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E14-25 | Required OEM function "Ignition coil 7 (IGT7)" (ignition_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E14-26 | Required OEM function "Ignition coil 8 (IGT8)" (ignition_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E14-7 | Required OEM function "Throttle motor − (M−)" (hbridge_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E14-8 | Required OEM function "Throttle motor + (M+)" (hbridge_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E15-9 | Required OEM function "Ignition switch (+12V)" (digital_in) is not connected to the new ECU. |
| warn | NET_FAMILY | OEM-E13-15 ↔ MS3PROMINI-A-34 | OEM-E13-15 "VVT position sensor RH (VVR+)" [trigger_in] is wired to MS3PROMINI-A-34 "Digital frequency in 1 (Hall)" [digital_in]. Hall-type cam/speed signals can use a digital input if it handles the frequency; VR signals cannot. |
| info | NET_FAMILY | OEM-E13-23 ↔ MS3PROMINI-A-21 | OEM-E13-23 "VVT position sensor RH (VVR−)" [trigger_in] is wired to MS3PROMINI-A-21 "Sensor ground" [sensor_ground]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs. |
| info | UNMAPPED | OEM | 19 optional OEM pins are not mapped: OEM-E11-17 Starter signal (STA); OEM-E11-18 O2 sensor signal (bank unconfirmed); OEM-E11-27 O2 sensor signal (bank unconfirmed); OEM-E11-28 VVT oil-control valve RH (OCR−); OEM-E11-5 Diagnostic test (TC); OEM-E11-7 O2 sensor heater (bank unconfirmed); OEM-E11-8 O2 sensor heater (bank unconfirmed); OEM-E12-12 Throttle magnetic clutch + (CL+); OEM-E13-11 O2 sensor signal (bank unconfirmed); OEM-E13-12 O2 sensor signal (bank unconfirmed); OEM-E13-3 O2 sensor heater (bank unconfirmed); OEM-E13-4 O2 sensor heater (bank unconfirmed); OEM-E13-8 Throttle magnetic clutch − (CL−); OEM-E14-19 VVT oil-control valve LH (OCV−); OEM-E14-29 ACIS induction VSV; OEM-E15-10 EFI main relay control (MREL); OEM-E15-11 OBD-II / DLC3 data (SIL); OEM-E15-5 Fuel pump relay control (FC); OEM-E15-6 Check engine light (W) |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-E15-1 | 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 8 cylinders: wasted spark (pair coils per firing order) - Trigger pattern needs a workaround: 1UZ-FE VVT-i runs on MS3 via the "2JZ VVTi" spark mode (36-2 crank + cam, documented for 8-cyl VVTi; community-confirmed with 1UZ phasing). MS3Pro Mini has no built-in DBW, so e-throttle needs the AMP Drive-By-Wire Controller; 4 ignition... 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-E14 18: Knock sensor LH (KNKL): no free knock input on AMP EFI MS3Pro Mini - OEM-E14 17: Knock sensor RH (KNKR): no free knock input on AMP EFI MS3Pro Mini - OEM-E14 15: Ignition coil 5 (IGT5): no free ignition output on AMP EFI MS3Pro Mini - OEM-E14 16: Ignition coil 6 (IGT6): no free ignition output on AMP EFI MS3Pro Mini - OEM-E14 25: Ignition coil 7 (IGT7): no free ignition output on AMP EFI MS3Pro Mini - OEM-E14 26: Ignition coil 8 (IGT8): no free ignition output on AMP EFI MS3Pro Mini - OEM-E14 7: Throttle motor − (M−): needs a paired H-bridge on AMP EFI MS3Pro Mini (H-bridge pairing not in the library: set device_pin.bridge_pair from the ECU manual) - OEM-E14 8: Throttle motor + (M+): needs a paired H-bridge on AMP EFI MS3Pro Mini (H-bridge pairing not in the library: set device_pin.bridge_pair from the ECU manual) - OEM-E15 9: Ignition switch (+12V): 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 Not wired: - OEM-E15 1: Battery constant (+12V): AMP EFI MS3Pro Mini has no battery-constant input; not needed - OEM-E15 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-E15 5: Fuel pump relay control (FC): no free relay_control/low_side/heater_low_side/ls_hs/injector rated ≥ 0.2 A on AMP EFI MS3Pro Mini - OEM-E11 7: O2 sensor heater (bank unconfirmed): no free heater_low_side/low_side/relay_control/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-E11 8: O2 sensor heater (bank unconfirmed): no free heater_low_side/low_side/relay_control/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-E13 3: O2 sensor heater (bank unconfirmed): no free heater_low_side/low_side/relay_control/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-E13 4: O2 sensor heater (bank unconfirmed): no free heater_low_side/low_side/relay_control/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-E11 28: VVT oil-control valve RH (OCR−): no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-E12 12: Throttle magnetic clutch + (CL+): no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-E13 8: Throttle magnetic clutch − (CL−): no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-E14 19: VVT oil-control valve LH (OCV−): no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-E14 29: ACIS induction VSV: no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-E15 6: Check engine light (W): no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-E11 18: O2 sensor signal (bank unconfirmed): no free o2_narrowband/analog_0_5 on AMP EFI MS3Pro Mini - OEM-E11 27: O2 sensor signal (bank unconfirmed): no free o2_narrowband/analog_0_5 on AMP EFI MS3Pro Mini - OEM-E13 11: O2 sensor signal (bank unconfirmed): no free o2_narrowband/analog_0_5 on AMP EFI MS3Pro Mini - OEM-E13 12: O2 sensor signal (bank unconfirmed): no free o2_narrowband/analog_0_5 on AMP EFI MS3Pro Mini - OEM-E11 17: Starter signal (STA): no free switch_in/frequency_in/analog_0_5 on AMP EFI MS3Pro Mini - OEM-E15 11: OBD-II / DLC3 data (SIL): no free k_line on AMP EFI MS3Pro Mini - OEM-E11 5: Diagnostic test (TC): 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 | vendor_doc | Toyota 1UZ-FE (VVT-i) engine manual M1UZ | http://www.epicmarine.com/docs/M1UZrm.pdf | — | — | — |
| 3 | community_copy | 1998 Lexus LS400 ECM terminal voltage chart (RM717U translation) | https://www.renrendoc.com/p-59096353.html | — | — | — |