Lexus LS400 1989-97 (1UZ-FE non-VVTi) → Motorsport Electronics ME221 (auto)
Lexus LS400 1989-97 (1UZ-FE non-VVTi) — Motorsport Electronics — ME221
⚠ 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 | 1: read the Findings page before cutting any wire |
| Size of the job | 46 wires · 8 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-A-12 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-A-13 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | ME221-C1-15 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | SP-14V-1 | ME221-C1-64 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-A-22 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-D-13 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-D-26 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | ME221-C1-10 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | ME221-C1-61 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | ME221-C1-89 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-GND-1 | ME221-C1-90 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-A-18 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-C-15 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-C-16 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-0V-1 | ME221-C1-52 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-0V-1 | ME221-C1-84 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-A-11 | ME221-C1-45 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-C-8 | ME221-C1-80 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-C-7 | ME221-C1-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-C-6 | ME221-C1-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-C-3 | ME221-C1-53 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-C-5 | ME221-C1-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-C-13 | ME221-C1-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-D-12 | ME221-C1-63 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-D-11 | ME221-C1-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-D-24 | ME221-C1-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-D-25 | ME221-C1-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-A-4 | ME221-C1-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-A-5 | ME221-C1-86 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-B-4 | ME221-C1-73 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-B-6 | ME221-C1-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-B-7 | ME221-C1-74 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-D-19 | ME221-C1-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-D-20 | ME221-C1-44 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-D-17 | ME221-C1-69 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-D-8 | ME221-C1-39 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-D-7 | ME221-C1-37 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-D-6 | ME221-C1-42 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-D-5 | ME221-C1-72 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-B-5 | ME221-C1-43 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-A-17 | ME221-C1-56 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-A-6 | ME221-C1-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-B-11 | ME221-C1-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-A-16 | ME221-C1-57 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-C-2 | ME221-C1-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-C-10 | ME221-C1-7 | 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 | ME221-C1-15 | ME221-C1-10 | open (OL) | +12 V supply must not touch power ground | |
| 2 | ME221-C1-15 | ME221-C1-52 | open (OL) | +12 V supply must not touch sensor ground | |
| 3 | ME221-C1-45 | ME221-C1-10 | open (OL) | 5 V sensor reference must not touch power ground | |
| 4 | ME221-C1-45 | ME221-C1-52 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 5 | ME221-C1-45 | ME221-C1-15 | 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
ME221-C1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | COIL 4 | — | — | — | — | — | — | — | — |
| 10 | GROUND CHASSIS | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 12 | LOW SIDE 2 | — | W31 | — | 0.5 | OEM-B-6 | — | — | — |
| 14 | LSU +12V | — | — | — | — | — | — | — | — |
| 15 | IGN +12V | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 16 | LSU HEATER -VE | — | W33 | — | 0.5 | OEM-D-19 | — | — | — |
| 17 | ANA VOLT 3 | — | W42 | — | 0.5 | OEM-A-6 | — | — | — |
| 18 | ANA VOLT 4 | — | W43 | — | 0.5 | OEM-B-11 | — | — | — |
| 19 | LSU UN | — | — | — | — | — | — | — | — |
| 2 | COIL 3 | — | — | — | — | — | — | — | — |
| 20 | LSU VM | — | — | — | — | — | — | — | — |
| 21 | CAN 1 HIGH | — | — | — | — | — | — | — | — |
| 22 | CAM A VR+ | — | W19 | — | 0.5 | OEM-C-7 | — | — | — |
| 23 | CAM A VR- | — | W20 | — | 0.5 | OEM-C-6 | — | — | — |
| 24 | SERIAL 1 GROUND | — | — | — | — | — | — | — | — |
| 25 | SERIAL 1 TX | — | — | — | — | — | — | — | — |
| 26 | ANA VOLT 1 | — | W28 | — | 0.5 | OEM-A-4 | — | — | — |
| 3 | INJECTOR 4 | — | W27 | — | 0.5 | OEM-D-25 | — | — | — |
| 31 | COIL 2 | — | W23 | — | 0.5 | OEM-C-13 | — | — | — |
| 32 | COIL 1 | — | W22 | — | 0.5 | OEM-C-5 | — | — | — |
| 33 | INJECTOR 3 | — | W26 | — | 0.5 | OEM-D-24 | — | — | — |
| 35 | USB D+ | — | — | — | — | — | — | — | — |
| 36 | USB D- | — | — | — | — | — | — | — | — |
| 37 | LOW SIDE RELAY 11 | — | W37 | — | 0.5 | OEM-D-7 | — | — | — |
| 38 | USB VBUS | — | — | — | — | — | — | — | — |
| 39 | LOW SIDE 6 | — | W36 | — | 0.5 | OEM-D-8 | — | — | — |
| 4 | INJECTOR 2 | — | W25 | — | 0.5 | OEM-D-11 | — | — | — |
| 41 | USB GROUND | — | — | — | — | — | — | — | — |
| 42 | LOW SIDE RELAY 12 | — | W38 | — | 0.5 | OEM-D-6 | — | — | — |
| 43 | LOW SIDE RELAY 14 | — | W40 | — | 0.5 | OEM-B-5 | — | — | — |
| 44 | LOW SIDE 4 | — | W34 | — | 0.5 | OEM-D-20 | — | — | — |
| 45 | 5V REF | — | W17 | — | 0.5 | OEM-A-11 | — | — | — |
| 46 | 5V REF | — | — | — | — | — | — | — | — |
| 49 | LSU IA | — | — | — | — | — | — | — | — |
| 50 | LSU IP | — | — | — | — | — | — | — | — |
| 51 | CAN 1 LOW | — | — | — | — | — | — | — | — |
| 52 | SENSORS GROUND | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 53 | KNOCK 1 SIGNAL | — | W21 | — | 0.5 | OEM-C-3 | — | — | — |
| 55 | SERIAL 1 RX | — | — | — | — | — | — | — | — |
| 56 | ANA VOLT 2 | — | W41 | — | 0.5 | OEM-A-17 | — | — | — |
| 57 | ANA TEMP 2 | — | W44 | — | 0.5 | OEM-A-16 | — | — | — |
| 6 | DIG_IN 1 | — | W45 | — | 0.5 | OEM-C-2 | — | — | — |
| 61 | GROUND | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 63 | INJECTOR 1 | — | W24 | — | 0.5 | OEM-D-12 | — | — | — |
| 64 | VBAT | — | W4 | — | 0.85 | SP-14V-1 | — | — | — |
| 67 | Stepper 1 / A1 | — | — | — | — | — | — | — | — |
| 68 | Stepper 2 / A2 | — | — | — | — | — | — | — | — |
| 69 | LOW SIDE 5 | — | W35 | — | 0.5 | OEM-D-17 | — | — | — |
| 7 | DIG_IN 2 | — | W46 | — | 0.5 | OEM-C-10 | — | — | — |
| 70 | Stepper 3 / B1 | — | — | — | — | — | — | — | — |
| 71 | Stepper 4 / B2 | — | — | — | — | — | — | — | — |
| 72 | LOW SIDE RELAY 13 | — | W39 | — | 0.5 | OEM-D-5 | — | — | — |
| 73 | LOW SIDE 1 | — | W30 | — | 0.5 | OEM-B-4 | — | — | — |
| 74 | LOW SIDE 3 | — | W32 | — | 0.5 | OEM-B-7 | — | — | — |
| 76 | 5V REF | — | — | — | — | — | — | — | — |
| 79 | TACHOMETER | — | — | — | — | — | — | — | — |
| 80 | CRANK VR+ | — | W18 | — | 0.5 | OEM-C-8 | — | — | — |
| 81 | CRANK VR- | — | — | — | — | — | — | — | — |
| 84 | Sensor Ground | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 86 | ANA TEMP 1 | — | W29 | — | 0.5 | OEM-A-5 | — | — | — |
| 89 | GROUND | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| 90 | GROUND | — | W11 | — | 0.85 | SP-GND-1 | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ignition switch (IGSW) | — | — | — | — | — | — | — | — |
| 11 | Sensor supply +5V (VC) | — | W17 | — | 0.5 | ME221-C1-45 | — | — | — |
| 12 | EFI main relay (B+) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 13 | EFI main relay (B1+) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 14 | Neutral start switch (NSW) | — | — | — | — | — | — | — | — |
| 16 | Intake air temperature (THA) | — | W44 | — | 0.5 | ME221-C1-57 | — | — | — |
| 17 | O2 right front (OXR1) | — | W41 | — | 0.5 | ME221-C1-56 | — | — | — |
| 18 | Sensor ground (E2) | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | Vehicle speed (SPD) | — | — | — | — | — | — | — | — |
| 2 | Starter signal (STA) | — | — | — | — | — | — | — | — |
| 20 | Diagnostic test 2 (TE2) | — | — | — | — | — | — | — | — |
| 22 | Power ground (E1) | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 4 | Throttle position (VTA1) | — | W28 | — | 0.5 | ME221-C1-26 | — | — | — |
| 5 | Coolant temperature (THW) | — | W29 | — | 0.5 | ME221-C1-86 | — | — | — |
| 6 | O2 left front (OXL1) | — | W42 | — | 0.5 | ME221-C1-17 | — | — | — |
| 7 | EGR temperature sensor | — | — | — | — | — | — | — | — |
| 8 | Knock/shield (KS) | — | — | — | — | — | — | — | — |
| 9 | Diagnostic test 1 (TE1) | — | — | — | — | — | — | — | — |
OEM-B
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 11 | O2 right rear (OXR2) | — | W43 | — | 0.5 | ME221-C1-18 | — | — | — |
| 19 | Stop light switch (BK) | — | — | — | — | — | — | — | — |
| 20 | A/T kickdown switch (KD) | — | — | — | — | — | — | — | — |
| 23 | A/C request (AC) | — | — | — | — | — | — | — | — |
| 24 | O2 left rear (OXL2) | — | — | — | — | — | — | — | — |
| 26 | Battery constant (BATT) | — | — | — | — | — | — | — | — |
| 4 | EFI main relay control (MREL) | — | W30 | — | 0.5 | ME221-C1-73 | — | — | — |
| 5 | Check-engine lamp (W) | — | W40 | — | 0.5 | ME221-C1-43 | — | — | — |
| 6 | Fuel pump relay (FPR) | — | W31 | — | 0.5 | ME221-C1-12 | — | — | — |
| 7 | A/C clutch relay (ACMG) | — | W32 | — | 0.5 | ME221-C1-74 | — | — | — |
| 8 | Fuel pump control (FC) | — | — | — | — | — | — | — | — |
OEM-C
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | TPS idle switch (IDL) | — | — | — | — | — | — | — | — |
| 10 | Igniter 2 feedback (IGF2) | — | W46 | — | 0.5 | ME221-C1-7 | — | — | — |
| 11 | Knock sensor 2 (KNK2) | — | — | — | — | — | — | — | — |
| 12 | Check connector VF2 | — | — | — | — | — | — | — | — |
| 13 | Ignition 2 (IGT2) | — | W23 | — | 0.5 | ME221-C1-31 | — | — | — |
| 15 | Cam sensor ground (G-) | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 16 | Crank sensor - (NE-) | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 2 | Igniter 1 feedback (IGF1) | — | W45 | — | 0.5 | ME221-C1-6 | — | — | — |
| 3 | Knock sensor 1 (KNK1) | — | W21 | — | 0.5 | ME221-C1-53 | — | — | — |
| 4 | Check connector VF1 | — | — | — | — | — | — | — | — |
| 5 | Ignition 1 (IGT1) | — | W22 | — | 0.5 | ME221-C1-32 | — | — | — |
| 6 | Cam sensor 2 + (G2+) | — | W20 | — | 0.5 | ME221-C1-23 | — | — | — |
| 7 | Cam sensor 1 + (G1+) | — | W19 | — | 0.5 | ME221-C1-22 | — | — | — |
| 8 | Crank sensor + (NE+) | — | W18 | — | 0.5 | ME221-C1-80 | — | — | — |
OEM-D
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 11 | Injector 2&8 (#20) | — | W25 | — | 0.5 | ME221-C1-4 | — | — | — |
| 12 | Injector 1&7 (#10) | — | W24 | — | 0.5 | ME221-C1-63 | — | — | — |
| 13 | Power ground (E01) | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 17 | Cold start injector 1 (STJ1) | — | W35 | — | 0.5 | ME221-C1-69 | — | — | — |
| 19 | O2 heater 2 (HT2) | — | W33 | — | 0.5 | ME221-C1-16 | — | — | — |
| 20 | O2 heater 1 (HT1) | — | W34 | — | 0.5 | ME221-C1-44 | — | — | — |
| 21 | EGR solenoid | — | — | — | — | — | — | — | — |
| 22 | Fuel pressure-up VSV (PR) | — | — | — | — | — | — | — | — |
| 24 | Injector 3&5 (#40) | — | W26 | — | 0.5 | ME221-C1-33 | — | — | — |
| 25 | Injector 4&6 (#30) | — | W27 | — | 0.5 | ME221-C1-3 | — | — | — |
| 26 | Power ground (E02) | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 4 | Cold start injector (STJ) | — | — | — | — | — | — | — | — |
| 5 | ISC stepper coil 4 (ISC4) | — | W39 | — | 0.5 | ME221-C1-72 | — | — | — |
| 6 | ISC stepper coil 3 (ISC3) | — | W38 | — | 0.5 | ME221-C1-42 | — | — | — |
| 7 | ISC stepper coil 2 (ISC2) | — | W37 | — | 0.5 | ME221-C1-37 | — | — | — |
| 8 | ISC stepper coil 1 (ISC1) | — | W36 | — | 0.5 | ME221-C1-39 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W12 | — | 0.5 | OEM-A-18 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-C-15 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | OEM-C-16 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | ME221-C1-52 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | ME221-C1-84 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-A-12 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-A-13 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | ME221-C1-15 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | ME221-C1-64 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W5 | — | 0.85 | OEM-A-22 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-D-13 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-D-26 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | ME221-C1-10 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | ME221-C1-61 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | ME221-C1-89 | — | — | — |
| 1 | — | — | W11 | — | 0.85 | ME221-C1-90 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-A-1 | Ignition switch (IGSW) | digital_in | — | — | — | single_source | |
| OEM-A-11 | Sensor supply +5V (VC) | vref | ME221-C1-45 | 5V REF | vref | single_source | |
| OEM-A-12 | EFI main relay (B+) | power_in | ME221-C1-15 + ME221-C1-64 | IGN +12V + VBAT | power_in | single_source | |
| OEM-A-13 | EFI main relay (B1+) | power_in | ME221-C1-15 + ME221-C1-64 | IGN +12V + VBAT | power_in | single_source | |
| OEM-A-14 | Neutral start switch (NSW) | digital_in | — | — | — | single_source | |
| OEM-A-16 | Intake air temperature (THA) | temp_in | ME221-C1-57 | ANA TEMP 2 | temp_in | single_source | |
| OEM-A-17 | O2 right front (OXR1) | lambda_nb_in | ME221-C1-56 | ANA VOLT 2 | analog_in | single_source | |
| OEM-A-18 | Sensor ground (E2) | sensor_ground | ME221-C1-52 + ME221-C1-84 | SENSORS GROUND + Sensor Ground | sensor_ground | single_source | |
| OEM-A-19 | Vehicle speed (SPD) | digital_in | — | — | — | single_source | |
| OEM-A-2 | Starter signal (STA) | digital_in | — | — | — | single_source | |
| OEM-A-20 | Diagnostic test 2 (TE2) | digital_in | — | — | — | single_source | |
| OEM-A-22 | Power ground (E1) | ground | ME221-C1-10 + ME221-C1-61 + ME221-C1-89 + ME221-C1-90 | GROUND CHASSIS + GROUND + GROUND + GROUND | ground | single_source | |
| OEM-A-4 | Throttle position (VTA1) | analog_in | ME221-C1-26 | ANA VOLT 1 | analog_in | single_source | |
| OEM-A-5 | Coolant temperature (THW) | temp_in | ME221-C1-86 | ANA TEMP 1 | temp_in | single_source | |
| OEM-A-6 | O2 left front (OXL1) | lambda_nb_in | ME221-C1-17 | ANA VOLT 3 | analog_in | single_source | |
| OEM-A-7 | EGR temperature sensor | temp_in | — | — | — | single_source | |
| OEM-A-8 | Knock/shield (KS) | knock_in | — | — | — | single_source | |
| OEM-A-9 | Diagnostic test 1 (TE1) | digital_in | — | — | — | single_source | |
| OEM-B-11 | O2 right rear (OXR2) | lambda_nb_in | ME221-C1-18 | ANA VOLT 4 | analog_in | single_source | |
| OEM-B-19 | Stop light switch (BK) | digital_in | — | — | — | single_source | |
| OEM-B-20 | A/T kickdown switch (KD) | digital_in | — | — | — | single_source | |
| OEM-B-23 | A/C request (AC) | digital_in | — | — | — | single_source | |
| OEM-B-24 | O2 left rear (OXL2) | lambda_nb_in | — | — | — | single_source | |
| OEM-B-26 | Battery constant (BATT) | power_in | — | — | — | single_source | |
| OEM-B-4 | EFI main relay control (MREL) | low_side_out | ME221-C1-73 | LOW SIDE 1 | low_side_out | single_source | |
| OEM-B-5 | Check-engine lamp (W) | low_side_out | ME221-C1-43 | LOW SIDE RELAY 14 | low_side_out | single_source | |
| OEM-B-6 | Fuel pump relay (FPR) | low_side_out | ME221-C1-12 | LOW SIDE 2 | low_side_out | single_source | |
| OEM-B-7 | A/C clutch relay (ACMG) | low_side_out | ME221-C1-74 | LOW SIDE 3 | low_side_out | single_source | |
| OEM-B-8 | Fuel pump control (FC) | low_side_out | — | — | — | single_source | |
| OEM-C-1 | TPS idle switch (IDL) | digital_in | — | — | — | single_source | |
| OEM-C-10 | Igniter 2 feedback (IGF2) | digital_in | ME221-C1-7 | DIG_IN 2 | digital_in | single_source | |
| OEM-C-11 | Knock sensor 2 (KNK2) | knock_in | — | — | — | single_source | |
| OEM-C-12 | Check connector VF2 | analog_out | — | — | — | single_source | |
| OEM-C-13 | Ignition 2 (IGT2) | ignition_out | ME221-C1-31 | COIL 2 | ignition_out | single_source | |
| OEM-C-15 | Cam sensor ground (G-) | sensor_ground | ME221-C1-52 + ME221-C1-84 | SENSORS GROUND + Sensor Ground | sensor_ground | single_source | |
| OEM-C-16 | Crank sensor - (NE-) | sensor_ground | ME221-C1-52 + ME221-C1-84 | SENSORS GROUND + Sensor Ground | sensor_ground | single_source | |
| OEM-C-2 | Igniter 1 feedback (IGF1) | digital_in | ME221-C1-6 | DIG_IN 1 | digital_in | single_source | |
| OEM-C-3 | Knock sensor 1 (KNK1) | knock_in | ME221-C1-53 | KNOCK 1 SIGNAL | knock_in | single_source | |
| OEM-C-4 | Check connector VF1 | analog_out | — | — | — | single_source | |
| OEM-C-5 | Ignition 1 (IGT1) | ignition_out | ME221-C1-32 | COIL 1 | ignition_out | single_source | |
| OEM-C-6 | Cam sensor 2 + (G2+) | trigger_in | ME221-C1-23 | CAM A VR- | trigger_in | single_source | |
| OEM-C-7 | Cam sensor 1 + (G1+) | trigger_in | ME221-C1-22 | CAM A VR+ | trigger_in | single_source | |
| OEM-C-8 | Crank sensor + (NE+) | trigger_in | ME221-C1-80 | CRANK VR+ | trigger_in | single_source | |
| OEM-D-11 | Injector 2&8 (#20) | injector_out | ME221-C1-4 | INJECTOR 2 | injector_out | single_source | |
| OEM-D-12 | Injector 1&7 (#10) | injector_out | ME221-C1-63 | INJECTOR 1 | injector_out | single_source | |
| OEM-D-13 | Power ground (E01) | ground | ME221-C1-10 + ME221-C1-61 + ME221-C1-89 + ME221-C1-90 | GROUND CHASSIS + GROUND + GROUND + GROUND | ground | single_source | |
| OEM-D-17 | Cold start injector 1 (STJ1) | low_side_out | ME221-C1-69 | LOW SIDE 5 | low_side_out | single_source | |
| OEM-D-19 | O2 heater 2 (HT2) | low_side_out | ME221-C1-16 | LSU HEATER -VE | low_side_out | single_source | |
| OEM-D-20 | O2 heater 1 (HT1) | low_side_out | ME221-C1-44 | LOW SIDE 4 | low_side_out | single_source | |
| OEM-D-21 | EGR solenoid | low_side_out | — | — | — | single_source | |
| OEM-D-22 | Fuel pressure-up VSV (PR) | low_side_out | — | — | — | single_source | |
| OEM-D-24 | Injector 3&5 (#40) | injector_out | ME221-C1-33 | INJECTOR 3 | injector_out | single_source | |
| OEM-D-25 | Injector 4&6 (#30) | injector_out | ME221-C1-3 | INJECTOR 4 | injector_out | single_source | |
| OEM-D-26 | Power ground (E02) | ground | ME221-C1-10 + ME221-C1-61 + ME221-C1-89 + ME221-C1-90 | GROUND CHASSIS + GROUND + GROUND + GROUND | ground | single_source | |
| OEM-D-4 | Cold start injector (STJ) | low_side_out | — | — | — | single_source | |
| OEM-D-5 | ISC stepper coil 4 (ISC4) | low_side_out | ME221-C1-72 | LOW SIDE RELAY 13 | low_side_out | single_source | |
| OEM-D-6 | ISC stepper coil 3 (ISC3) | low_side_out | ME221-C1-42 | LOW SIDE RELAY 12 | low_side_out | single_source | |
| OEM-D-7 | ISC stepper coil 2 (ISC2) | low_side_out | ME221-C1-37 | LOW SIDE RELAY 11 | low_side_out | single_source | |
| OEM-D-8 | ISC stepper coil 1 (ISC1) | low_side_out | ME221-C1-39 | LOW SIDE 6 | low_side_out | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-A-12 | SP-14V-1 | 0.85 | no route | EFI main relay (B+) | — | |
| W2 | OEM-A-13 | SP-14V-1 | 0.85 | no route | EFI main relay (B1+) | — | |
| W3 | SP-14V-1 | ME221-C1-15 | 0.85 | no route | IGN +12V | — | |
| W4 | SP-14V-1 | ME221-C1-64 | 0.85 | no route | VBAT | — | |
| W5 | OEM-A-22 | SP-GND-1 | 0.85 | no route | Power ground (E1) | — | |
| W6 | OEM-D-13 | SP-GND-1 | 0.85 | no route | Power ground (E01) | — | |
| W7 | OEM-D-26 | SP-GND-1 | 0.85 | no route | Power ground (E02) | — | |
| W8 | SP-GND-1 | ME221-C1-10 | 0.85 | no route | GROUND CHASSIS | — | |
| W9 | SP-GND-1 | ME221-C1-61 | 0.85 | no route | GROUND | — | |
| W10 | SP-GND-1 | ME221-C1-89 | 0.85 | no route | GROUND | — | |
| W11 | SP-GND-1 | ME221-C1-90 | 0.85 | no route | GROUND | — | |
| W12 | OEM-A-18 | SP-0V-1 | 0.5 | no route | Sensor ground (E2) | — | |
| W13 | OEM-C-15 | SP-0V-1 | 0.5 | no route | Cam sensor ground (G-) | — | |
| W14 | OEM-C-16 | SP-0V-1 | 0.5 | no route | Crank sensor - (NE-) | — | |
| W15 | SP-0V-1 | ME221-C1-52 | 0.5 | no route | SENSORS GROUND | — | |
| W16 | SP-0V-1 | ME221-C1-84 | 0.5 | no route | Sensor Ground | — | |
| W17 | OEM-A-11 | ME221-C1-45 | 0.5 | no route | Sensor supply +5V (VC) | — | |
| W18 | OEM-C-8 | ME221-C1-80 | 0.5 | no route | Crank sensor + (NE+) | — | |
| W19 | OEM-C-7 | ME221-C1-22 | 0.5 | no route | Cam sensor 1 + (G1+) | — | |
| W20 | OEM-C-6 | ME221-C1-23 | 0.5 | no route | Cam sensor 2 + (G2+) | — | |
| W21 | OEM-C-3 | ME221-C1-53 | 0.5 | no route | Knock sensor 1 (KNK1) | — | |
| W22 | OEM-C-5 | ME221-C1-32 | 0.5 | no route | Ignition 1 (IGT1) | — | |
| W23 | OEM-C-13 | ME221-C1-31 | 0.5 | no route | Ignition 2 (IGT2) | — | |
| W24 | OEM-D-12 | ME221-C1-63 | 0.5 | no route | Injector 1&7 (#10) | — | |
| W25 | OEM-D-11 | ME221-C1-4 | 0.5 | no route | Injector 2&8 (#20) | — | |
| W26 | OEM-D-24 | ME221-C1-33 | 0.5 | no route | Injector 3&5 (#40) | — | |
| W27 | OEM-D-25 | ME221-C1-3 | 0.5 | no route | Injector 4&6 (#30) | — | |
| W28 | OEM-A-4 | ME221-C1-26 | 0.5 | no route | Throttle position (VTA1) | — | |
| W29 | OEM-A-5 | ME221-C1-86 | 0.5 | no route | Coolant temperature (THW) | — | |
| W30 | OEM-B-4 | ME221-C1-73 | 0.5 | no route | EFI main relay control (MREL) | — | |
| W31 | OEM-B-6 | ME221-C1-12 | 0.5 | no route | Fuel pump relay (FPR) | — | |
| W32 | OEM-B-7 | ME221-C1-74 | 0.5 | no route | A/C clutch relay (ACMG) | — | |
| W33 | OEM-D-19 | ME221-C1-16 | 0.5 | no route | O2 heater 2 (HT2) | — | |
| W34 | OEM-D-20 | ME221-C1-44 | 0.5 | no route | O2 heater 1 (HT1) | — | |
| W35 | OEM-D-17 | ME221-C1-69 | 0.5 | no route | Cold start injector 1 (STJ1) | — | |
| W36 | OEM-D-8 | ME221-C1-39 | 0.5 | no route | ISC stepper coil 1 (ISC1) | — | |
| W37 | OEM-D-7 | ME221-C1-37 | 0.5 | no route | ISC stepper coil 2 (ISC2) | — | |
| W38 | OEM-D-6 | ME221-C1-42 | 0.5 | no route | ISC stepper coil 3 (ISC3) | — | |
| W39 | OEM-D-5 | ME221-C1-72 | 0.5 | no route | ISC stepper coil 4 (ISC4) | — | |
| W40 | OEM-B-5 | ME221-C1-43 | 0.5 | no route | Check-engine lamp (W) | — | |
| W41 | OEM-A-17 | ME221-C1-56 | 0.5 | no route | O2 right front (OXR1) | — | |
| W42 | OEM-A-6 | ME221-C1-17 | 0.5 | no route | O2 left front (OXL1) | — | |
| W43 | OEM-B-11 | ME221-C1-18 | 0.5 | no route | O2 right rear (OXR2) | — | |
| W44 | OEM-A-16 | ME221-C1-57 | 0.5 | no route | Intake air temperature (THA) | — | |
| W45 | OEM-C-2 | ME221-C1-6 | 0.5 | no route | Igniter 1 feedback (IGF1) | — | |
| W46 | OEM-C-10 | ME221-C1-7 | 0.5 | no route | Igniter 2 feedback (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 (2)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | REQUIRED_UNMAPPED | OEM-A-1 | Required OEM function "Ignition switch (IGSW)" (digital_in) is not connected to the new ECU. |
| info | UNMAPPED | OEM | 19 optional OEM pins are not mapped: OEM-A-14 Neutral start switch (NSW); OEM-A-19 Vehicle speed (SPD); OEM-A-2 Starter signal (STA); OEM-A-20 Diagnostic test 2 (TE2); OEM-A-7 EGR temperature sensor; OEM-A-8 Knock/shield (KS); OEM-A-9 Diagnostic test 1 (TE1); OEM-B-19 Stop light switch (BK); OEM-B-20 A/T kickdown switch (KD); OEM-B-23 A/C request (AC); OEM-B-24 O2 left rear (OXL2); OEM-B-8 Fuel pump control (FC); OEM-C-1 TPS idle switch (IDL); OEM-C-11 Knock sensor 2 (KNK2); OEM-C-12 Check connector VF2; OEM-C-4 Check connector VF1; OEM-D-21 EGR solenoid; OEM-D-22 Fuel pressure-up VSV (PR); OEM-D-4 Cold start injector (STJ) |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-B-26 | Battery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed. | mapping-proposal |
Notes
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-A 1: 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); Motorsport Electronics ME221 has no dedicated key-on input Not wired: - OEM-B 26: Battery constant (BATT): Motorsport Electronics ME221 has no battery-constant input; not needed - OEM-C 11: Knock sensor 2 (KNK2): no free knock input on Motorsport Electronics ME221 - OEM-A 8: Knock/shield (KS): no free knock input on Motorsport Electronics ME221 - OEM-B 8: Fuel pump control (FC): no free low_side/relay_control/heater_low_side/ls_hs/injector on Motorsport Electronics ME221 - OEM-D 21: EGR solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on Motorsport Electronics ME221 - OEM-D 22: Fuel pressure-up VSV (PR): no free low_side/relay_control/heater_low_side/ls_hs/injector on Motorsport Electronics ME221 - OEM-D 4: Cold start injector (STJ): no free low_side/relay_control/heater_low_side/ls_hs/injector on Motorsport Electronics ME221 - OEM-B 24: O2 left rear (OXL2): no free o2_narrowband/analog_0_5 on Motorsport Electronics ME221 - OEM-A 7: EGR temperature sensor: no free thermistor/analog_0_5 on Motorsport Electronics ME221 - OEM-A 19: Vehicle speed (SPD): no free frequency_in/switch_in on Motorsport Electronics ME221 - OEM-A 9: Diagnostic test 1 (TE1): no free switch_in/frequency_in/analog_0_5 on Motorsport Electronics ME221 - OEM-A 20: Diagnostic test 2 (TE2): no free switch_in/frequency_in/analog_0_5 on Motorsport Electronics ME221 - OEM-A 14: Neutral start switch (NSW): no free switch_in/frequency_in/analog_0_5 on Motorsport Electronics ME221 - OEM-A 2: Starter signal (STA): no free switch_in/frequency_in/analog_0_5 on Motorsport Electronics ME221 - OEM-B 19: Stop light switch (BK): no free switch_in/frequency_in/analog_0_5 on Motorsport Electronics ME221 - OEM-B 20: A/T kickdown switch (KD): no free switch_in/frequency_in/analog_0_5 on Motorsport Electronics ME221 - OEM-B 23: A/C request (AC): no free switch_in/frequency_in/analog_0_5 on Motorsport Electronics ME221 - OEM-C 1: TPS idle switch (IDL): no free switch_in/frequency_in/analog_0_5 on Motorsport Electronics ME221 - OEM-C 4: Check connector VF1: no free analog_out on Motorsport Electronics ME221 - OEM-C 12: Check connector VF2: no free analog_out on Motorsport Electronics ME221
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | Motorsport Electronics GEN2 ME221/ME360/ME442 wire-in pinout | https://motorsport-electronics.co.uk/onlinehelp/html/ME442ME360ME221GEN2Wire-InPinout.html | — | — | — |
| 2 | community_copy | Lextreme: Adaptronic install for 1UZ-FE (Lexus LS400/SC400) — 4-plug A/B/C/D ECU pin table (1992 LS400) | https://www.lextreme.com/installation-of-an-adaptronic-ecu-for-a-lexus-ls400-sc400-1uzfe-engine/ | — | — | — |