Lexus LS400 1989-97 (1UZ-FE non-VVTi) → MoTeC M800 universal (auto)
Lexus LS400 1989-97 (1UZ-FE non-VVTi) — MoTeC — M800
⚠ 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 | 2: read the Findings page before cutting any wire |
| Size of the job | 50 wires · 9 connectors · 3 part lines |
| Tools | Crimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink |
| Terminals | 3-1447221-4 |
| 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 | M800-A-26 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-A-22 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-D-13 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-D-26 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-GND-1 | M800-A-10 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | M800-A-11 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-A-18 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-C-15 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-C-16 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-0V-1 | M800-B-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | SP-0V-1 | M800-B-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | SP-0V-1 | M800-B-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-A-11 | M800-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-C-8 | M800-B-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-C-7 | M800-B-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-C-5 | M800-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-C-13 | M800-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-D-12 | M800-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-D-11 | M800-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-D-24 | M800-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-D-25 | M800-A-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-A-4 | M800-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-A-5 | M800-B-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-B-4 | M800-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-B-6 | M800-A-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-B-7 | M800-A-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-D-19 | M800-A-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-D-20 | M800-A-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-D-17 | M800-A-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-D-8 | M800-A-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-D-7 | M800-A-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-D-6 | M800-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-D-5 | M800-A-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-B-5 | M800-A-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-B-8 | M800-A-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-A-17 | M800-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-A-6 | M800-A-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-B-11 | M800-A-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-B-24 | M800-A-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-A-16 | M800-B-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-A-7 | M800-B-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-C-2 | M800-B-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-C-10 | M800-B-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-A-19 | M800-B-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-A-9 | M800-B-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-A-20 | M800-B-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-A-14 | M800-B-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | OEM-A-2 | M800-B-22 | 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 | M800-A-2 | M800-A-10 | open (OL) | 5 V sensor reference must not touch power ground | |
| 2 | M800-A-2 | M800-B-14 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 3 | M800-A-26 | M800-A-10 | open (OL) | +12 V supply must not touch power ground | |
| 4 | M800-A-26 | M800-B-14 | open (OL) | +12 V supply must not touch sensor ground | |
| 5 | M800-A-2 | M800-A-26 | 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
M800-A
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | AUX2 | — | W27 | — | 0.5 | OEM-B-6 | — | — | — |
| 2 | 5V Engine Sensor Supply | — | W15 | — | 0.5 | OEM-A-11 | — | — | — |
| 3 | IGN1 | — | W18 | — | 0.5 | OEM-C-5 | — | — | — |
| 4 | IGN2 | — | W19 | — | 0.5 | OEM-C-13 | — | — | — |
| 5 | IGN3 | — | — | — | — | — | — | — | — |
| 6 | IGN4 | — | — | — | — | — | — | — | — |
| 7 | IGN5 | — | — | — | — | — | — | — | — |
| 8 | IGN6 | — | — | — | — | — | — | — | — |
| 9 | 5V Auxiliary Sensor Supply | — | — | — | — | — | — | — | — |
| 10 | GND Battery Negative | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 11 | GND Battery Negative | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 12 | 8V Engine Sensor Supply | — | — | — | — | — | — | — | — |
| 13 | 8V Auxiliary Sensor and CAN Supply | — | — | — | — | — | — | — | — |
| 14 | AV1 | — | W24 | — | 0.5 | OEM-A-4 | — | — | — |
| 15 | Analog Voltage Input 2 | — | W38 | — | 0.5 | OEM-A-17 | — | — | — |
| 16 | Analog Voltage Input 3 | — | W39 | — | 0.5 | OEM-A-6 | — | — | — |
| 17 | Analog Voltage Input 4 | — | W40 | — | 0.5 | OEM-B-11 | — | — | — |
| 18 | AUX1 | — | W26 | — | 0.5 | OEM-B-4 | — | — | — |
| 19 | INJ1 | — | W20 | — | 0.5 | OEM-D-12 | — | — | — |
| 20 | INJ2 | — | W21 | — | 0.5 | OEM-D-11 | — | — | — |
| 21 | INJ3 | — | W22 | — | 0.5 | OEM-D-24 | — | — | — |
| 22 | INJ4 | — | W23 | — | 0.5 | OEM-D-25 | — | — | — |
| 23 | AUX3 | — | W28 | — | 0.5 | OEM-B-7 | — | — | — |
| 24 | AUX4 | — | W29 | — | 0.5 | OEM-D-19 | — | — | — |
| 25 | Analog Voltage Input 5 | — | W41 | — | 0.5 | OEM-B-24 | — | — | — |
| 26 | VBAT Battery Positive | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 27 | INJ5 | — | W34 | — | 0.5 | OEM-D-6 | — | — | — |
| 28 | INJ6 | — | W35 | — | 0.5 | OEM-D-5 | — | — | — |
| 29 | INJ7 | — | W36 | — | 0.5 | OEM-B-5 | — | — | — |
| 30 | INJ8 | — | W37 | — | 0.5 | OEM-B-8 | — | — | — |
| 31 | AUX5 | — | W30 | — | 0.5 | OEM-D-20 | — | — | — |
| 32 | AUX6 | — | W31 | — | 0.5 | OEM-D-17 | — | — | — |
| 33 | AUX7 | — | W32 | — | 0.5 | OEM-D-8 | — | — | — |
| 34 | AUX8 | — | W33 | — | 0.5 | OEM-D-7 | — | — | — |
M800-B
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Crank Reference Timing Input | — | W16 | — | 0.5 | OEM-C-8 | — | — | — |
| 2 | Cam Sync Timing Input | — | W17 | — | 0.5 | OEM-C-7 | — | — | — |
| 3 | Analog Temperature Input 1 | — | W25 | — | 0.5 | OEM-A-5 | — | — | — |
| 4 | Analog Temperature Input 2 | — | W42 | — | 0.5 | OEM-A-16 | — | — | — |
| 5 | Analog Temperature Input 3 | — | W43 | — | 0.5 | OEM-A-7 | — | — | — |
| 6 | Analog Temperature Input 4 | — | — | — | — | — | — | — | — |
| 7 | Analog Temperature Input 5 | — | — | — | — | — | — | — | — |
| 8 | Digital Input 1 | — | W44 | — | 0.5 | OEM-C-2 | — | — | — |
| 9 | Digital Input 2 | — | W45 | — | 0.5 | OEM-C-10 | — | — | — |
| 10 | Digital Input 3 | — | W46 | — | 0.5 | OEM-A-19 | — | — | — |
| 11 | Digital Input 4 | — | W47 | — | 0.5 | OEM-A-9 | — | — | — |
| 12 | Lambda2 Sense Voltage | — | — | — | — | — | — | — | — |
| 13 | Lambda2 Pump Current | — | — | — | — | — | — | — | — |
| 14 | 0V Comms Reference | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 15 | 0V Auxiliary Sensor Supply | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 16 | 0V Engine Sensor Supply | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 17 | RS232 Transmit Data | — | — | — | — | — | — | — | — |
| 18 | RS232 Receive Data | — | — | — | — | — | — | — | — |
| 19 | Analog Temperature Input 6 | — | — | — | — | — | — | — | — |
| 20 | Analog Voltage Input 6 | — | W48 | — | 0.5 | OEM-A-20 | — | — | — |
| 21 | AV7 | — | W49 | — | 0.5 | OEM-A-14 | — | — | — |
| 22 | AV8 | — | W50 | — | 0.5 | OEM-A-2 | — | — | — |
| 23 | CAN Bus High | — | — | — | — | — | — | — | — |
| 24 | CAN Bus Low | — | — | — | — | — | — | — | — |
| 25 | Lambda1 Sense Voltage | — | — | — | — | — | — | — | — |
| 26 | Lambda1 Pump Current | — | — | — | — | — | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ignition switch (IGSW) | — | — | — | — | — | — | — | — |
| 11 | Sensor supply +5V (VC) | — | W15 | — | 0.5 | M800-A-2 | — | — | — |
| 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) | — | W49 | — | 0.5 | M800-B-21 | — | — | — |
| 16 | Intake air temperature (THA) | — | W42 | — | 0.5 | M800-B-4 | — | — | — |
| 17 | O2 right front (OXR1) | — | W38 | — | 0.5 | M800-A-15 | — | — | — |
| 18 | Sensor ground (E2) | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | Vehicle speed (SPD) | — | W46 | — | 0.5 | M800-B-10 | — | — | — |
| 2 | Starter signal (STA) | — | W50 | — | 0.5 | M800-B-22 | — | — | — |
| 20 | Diagnostic test 2 (TE2) | — | W48 | — | 0.5 | M800-B-20 | — | — | — |
| 22 | Power ground (E1) | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| 4 | Throttle position (VTA1) | — | W24 | — | 0.5 | M800-A-14 | — | — | — |
| 5 | Coolant temperature (THW) | — | W25 | — | 0.5 | M800-B-3 | — | — | — |
| 6 | O2 left front (OXL1) | — | W39 | — | 0.5 | M800-A-16 | — | — | — |
| 7 | EGR temperature sensor | — | W43 | — | 0.5 | M800-B-5 | — | — | — |
| 8 | Knock/shield (KS) | — | — | — | — | — | — | — | — |
| 9 | Diagnostic test 1 (TE1) | — | W47 | — | 0.5 | M800-B-11 | — | — | — |
OEM-B
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 11 | O2 right rear (OXR2) | — | W40 | — | 0.5 | M800-A-17 | — | — | — |
| 19 | Stop light switch (BK) | — | — | — | — | — | — | — | — |
| 20 | A/T kickdown switch (KD) | — | — | — | — | — | — | — | — |
| 23 | A/C request (AC) | — | — | — | — | — | — | — | — |
| 24 | O2 left rear (OXL2) | — | W41 | — | 0.5 | M800-A-25 | — | — | — |
| 26 | Battery constant (BATT) | — | — | — | — | — | — | — | — |
| 4 | EFI main relay control (MREL) | — | W26 | — | 0.5 | M800-A-18 | — | — | — |
| 5 | Check-engine lamp (W) | — | W36 | — | 0.5 | M800-A-29 | — | — | — |
| 6 | Fuel pump relay (FPR) | — | W27 | — | 0.5 | M800-A-1 | — | — | — |
| 7 | A/C clutch relay (ACMG) | — | W28 | — | 0.5 | M800-A-23 | — | — | — |
| 8 | Fuel pump control (FC) | — | W37 | — | 0.5 | M800-A-30 | — | — | — |
OEM-C
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | TPS idle switch (IDL) | — | — | — | — | — | — | — | — |
| 10 | Igniter 2 feedback (IGF2) | — | W45 | — | 0.5 | M800-B-9 | — | — | — |
| 11 | Knock sensor 2 (KNK2) | — | — | — | — | — | — | — | — |
| 12 | Check connector VF2 | — | — | — | — | — | — | — | — |
| 13 | Ignition 2 (IGT2) | — | W19 | — | 0.5 | M800-A-4 | — | — | — |
| 15 | Cam sensor ground (G-) | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 16 | Crank sensor - (NE-) | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 2 | Igniter 1 feedback (IGF1) | — | W44 | — | 0.5 | M800-B-8 | — | — | — |
| 3 | Knock sensor 1 (KNK1) | — | — | — | — | — | — | — | — |
| 4 | Check connector VF1 | — | — | — | — | — | — | — | — |
| 5 | Ignition 1 (IGT1) | — | W18 | — | 0.5 | M800-A-3 | — | — | — |
| 6 | Cam sensor 2 + (G2+) | — | — | — | — | — | — | — | — |
| 7 | Cam sensor 1 + (G1+) | — | W17 | — | 0.5 | M800-B-2 | — | — | — |
| 8 | Crank sensor + (NE+) | — | W16 | — | 0.5 | M800-B-1 | — | — | — |
OEM-D
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 11 | Injector 2&8 (#20) | — | W21 | — | 0.5 | M800-A-20 | — | — | — |
| 12 | Injector 1&7 (#10) | — | W20 | — | 0.5 | M800-A-19 | — | — | — |
| 13 | Power ground (E01) | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 17 | Cold start injector 1 (STJ1) | — | W31 | — | 0.5 | M800-A-32 | — | — | — |
| 19 | O2 heater 2 (HT2) | — | W29 | — | 0.5 | M800-A-24 | — | — | — |
| 20 | O2 heater 1 (HT1) | — | W30 | — | 0.5 | M800-A-31 | — | — | — |
| 21 | EGR solenoid | — | — | — | — | — | — | — | — |
| 22 | Fuel pressure-up VSV (PR) | — | — | — | — | — | — | — | — |
| 24 | Injector 3&5 (#40) | — | W22 | — | 0.5 | M800-A-21 | — | — | — |
| 25 | Injector 4&6 (#30) | — | W23 | — | 0.5 | M800-A-22 | — | — | — |
| 26 | Power ground (E02) | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 4 | Cold start injector (STJ) | — | — | — | — | — | — | — | — |
| 5 | ISC stepper coil 4 (ISC4) | — | W35 | — | 0.5 | M800-A-28 | — | — | — |
| 6 | ISC stepper coil 3 (ISC3) | — | W34 | — | 0.5 | M800-A-27 | — | — | — |
| 7 | ISC stepper coil 2 (ISC2) | — | W33 | — | 0.5 | M800-A-34 | — | — | — |
| 8 | ISC stepper coil 1 (ISC1) | — | W32 | — | 0.5 | M800-A-33 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W9 | — | 0.5 | OEM-A-18 | — | — | — |
| 1 | — | — | W10 | — | 0.5 | OEM-C-15 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-C-16 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | M800-B-14 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | M800-B-15 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | M800-B-16 | — | — | — |
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 | M800-A-26 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 0.85 | OEM-A-22 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-D-13 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-D-26 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | M800-A-10 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | M800-A-11 | — | — | — |
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 | M800-A-2 | 5V Engine Sensor Supply | vref | single_source | |
| OEM-A-12 | EFI main relay (B+) | power_in | M800-A-26 | VBAT Battery Positive | power_in | single_source | |
| OEM-A-13 | EFI main relay (B1+) | power_in | M800-A-26 | VBAT Battery Positive | power_in | single_source | |
| OEM-A-14 | Neutral start switch (NSW) | digital_in | M800-B-21 | AV7 | analog_in | single_source | |
| OEM-A-16 | Intake air temperature (THA) | temp_in | M800-B-4 | Analog Temperature Input 2 | temp_in | single_source | |
| OEM-A-17 | O2 right front (OXR1) | lambda_nb_in | M800-A-15 | Analog Voltage Input 2 | analog_in | single_source | |
| OEM-A-18 | Sensor ground (E2) | sensor_ground | M800-B-14 + M800-B-15 + M800-B-16 | 0V Comms Reference + 0V Auxiliary Sensor Supply + 0V Engine Sensor Supply | sensor_ground | single_source | |
| OEM-A-19 | Vehicle speed (SPD) | digital_in | M800-B-10 | Digital Input 3 | digital_in | single_source | |
| OEM-A-2 | Starter signal (STA) | digital_in | M800-B-22 | AV8 | analog_in | single_source | |
| OEM-A-20 | Diagnostic test 2 (TE2) | digital_in | M800-B-20 | Analog Voltage Input 6 | analog_in | single_source | |
| OEM-A-22 | Power ground (E1) | ground | M800-A-10 + M800-A-11 | GND Battery Negative + GND Battery Negative | ground | single_source | |
| OEM-A-4 | Throttle position (VTA1) | analog_in | M800-A-14 | AV1 | analog_in | single_source | |
| OEM-A-5 | Coolant temperature (THW) | temp_in | M800-B-3 | Analog Temperature Input 1 | temp_in | single_source | |
| OEM-A-6 | O2 left front (OXL1) | lambda_nb_in | M800-A-16 | Analog Voltage Input 3 | analog_in | single_source | |
| OEM-A-7 | EGR temperature sensor | temp_in | M800-B-5 | Analog Temperature Input 3 | temp_in | single_source | |
| OEM-A-8 | Knock/shield (KS) | knock_in | — | — | — | single_source | |
| OEM-A-9 | Diagnostic test 1 (TE1) | digital_in | M800-B-11 | Digital Input 4 | digital_in | single_source | |
| OEM-B-11 | O2 right rear (OXR2) | lambda_nb_in | M800-A-17 | Analog Voltage Input 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 | M800-A-25 | Analog Voltage Input 5 | analog_in | single_source | |
| OEM-B-26 | Battery constant (BATT) | power_in | — | — | — | single_source | |
| OEM-B-4 | EFI main relay control (MREL) | low_side_out | M800-A-18 | AUX1 | switch_out | single_source | |
| OEM-B-5 | Check-engine lamp (W) | low_side_out | M800-A-29 | INJ7 | injector_out | single_source | |
| OEM-B-6 | Fuel pump relay (FPR) | low_side_out | M800-A-1 | AUX2 | switch_out | single_source | |
| OEM-B-7 | A/C clutch relay (ACMG) | low_side_out | M800-A-23 | AUX3 | switch_out | single_source | |
| OEM-B-8 | Fuel pump control (FC) | low_side_out | M800-A-30 | INJ8 | injector_out | single_source | |
| OEM-C-1 | TPS idle switch (IDL) | digital_in | — | — | — | single_source | |
| OEM-C-10 | Igniter 2 feedback (IGF2) | digital_in | M800-B-9 | Digital Input 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 | M800-A-4 | IGN2 | ignition_out | single_source | |
| OEM-C-15 | Cam sensor ground (G-) | sensor_ground | M800-B-14 + M800-B-15 + M800-B-16 | 0V Comms Reference + 0V Auxiliary Sensor Supply + 0V Engine Sensor Supply | sensor_ground | single_source | |
| OEM-C-16 | Crank sensor - (NE-) | sensor_ground | M800-B-14 + M800-B-15 + M800-B-16 | 0V Comms Reference + 0V Auxiliary Sensor Supply + 0V Engine Sensor Supply | sensor_ground | single_source | |
| OEM-C-2 | Igniter 1 feedback (IGF1) | digital_in | M800-B-8 | Digital Input 1 | digital_in | single_source | |
| OEM-C-3 | Knock sensor 1 (KNK1) | knock_in | — | — | — | single_source | |
| OEM-C-4 | Check connector VF1 | analog_out | — | — | — | single_source | |
| OEM-C-5 | Ignition 1 (IGT1) | ignition_out | M800-A-3 | IGN1 | ignition_out | single_source | |
| OEM-C-6 | Cam sensor 2 + (G2+) | trigger_in | — | — | — | single_source | |
| OEM-C-7 | Cam sensor 1 + (G1+) | trigger_in | M800-B-2 | Cam Sync Timing Input | trigger_in | single_source | |
| OEM-C-8 | Crank sensor + (NE+) | trigger_in | M800-B-1 | Crank Reference Timing Input | trigger_in | single_source | |
| OEM-D-11 | Injector 2&8 (#20) | injector_out | M800-A-20 | INJ2 | injector_out | single_source | |
| OEM-D-12 | Injector 1&7 (#10) | injector_out | M800-A-19 | INJ1 | injector_out | single_source | |
| OEM-D-13 | Power ground (E01) | ground | M800-A-10 + M800-A-11 | GND Battery Negative + GND Battery Negative | ground | single_source | |
| OEM-D-17 | Cold start injector 1 (STJ1) | low_side_out | M800-A-32 | AUX6 | switch_out | single_source | |
| OEM-D-19 | O2 heater 2 (HT2) | low_side_out | M800-A-24 | AUX4 | switch_out | single_source | |
| OEM-D-20 | O2 heater 1 (HT1) | low_side_out | M800-A-31 | AUX5 | switch_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 | M800-A-21 | INJ3 | injector_out | single_source | |
| OEM-D-25 | Injector 4&6 (#30) | injector_out | M800-A-22 | INJ4 | injector_out | single_source | |
| OEM-D-26 | Power ground (E02) | ground | M800-A-10 + M800-A-11 | GND Battery Negative + GND Battery Negative | 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 | M800-A-28 | INJ6 | injector_out | single_source | |
| OEM-D-6 | ISC stepper coil 3 (ISC3) | low_side_out | M800-A-27 | INJ5 | injector_out | single_source | |
| OEM-D-7 | ISC stepper coil 2 (ISC2) | low_side_out | M800-A-34 | AUX8 | switch_out | single_source | |
| OEM-D-8 | ISC stepper coil 1 (ISC1) | low_side_out | M800-A-33 | AUX7 | switch_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 | M800-A-26 | 0.85 | no route | VBAT Battery Positive | — | |
| W4 | OEM-A-22 | SP-GND-1 | 0.85 | no route | Power ground (E1) | — | |
| W5 | OEM-D-13 | SP-GND-1 | 0.85 | no route | Power ground (E01) | — | |
| W6 | OEM-D-26 | SP-GND-1 | 0.85 | no route | Power ground (E02) | — | |
| W7 | SP-GND-1 | M800-A-10 | 0.85 | no route | GND Battery Negative | — | |
| W8 | SP-GND-1 | M800-A-11 | 0.85 | no route | GND Battery Negative | — | |
| W9 | OEM-A-18 | SP-0V-1 | 0.5 | no route | Sensor ground (E2) | — | |
| W10 | OEM-C-15 | SP-0V-1 | 0.5 | no route | Cam sensor ground (G-) | — | |
| W11 | OEM-C-16 | SP-0V-1 | 0.5 | no route | Crank sensor - (NE-) | — | |
| W12 | SP-0V-1 | M800-B-14 | 0.5 | no route | 0V Comms Reference | — | |
| W13 | SP-0V-1 | M800-B-15 | 0.5 | no route | 0V Auxiliary Sensor Supply | — | |
| W14 | SP-0V-1 | M800-B-16 | 0.5 | no route | 0V Engine Sensor Supply | — | |
| W15 | OEM-A-11 | M800-A-2 | 0.5 | no route | Sensor supply +5V (VC) | — | |
| W16 | OEM-C-8 | M800-B-1 | 0.5 | no route | Crank sensor + (NE+) | — | |
| W17 | OEM-C-7 | M800-B-2 | 0.5 | no route | Cam sensor 1 + (G1+) | — | |
| W18 | OEM-C-5 | M800-A-3 | 0.5 | no route | Ignition 1 (IGT1) | — | |
| W19 | OEM-C-13 | M800-A-4 | 0.5 | no route | Ignition 2 (IGT2) | — | |
| W20 | OEM-D-12 | M800-A-19 | 0.5 | no route | Injector 1&7 (#10) | — | |
| W21 | OEM-D-11 | M800-A-20 | 0.5 | no route | Injector 2&8 (#20) | — | |
| W22 | OEM-D-24 | M800-A-21 | 0.5 | no route | Injector 3&5 (#40) | — | |
| W23 | OEM-D-25 | M800-A-22 | 0.5 | no route | Injector 4&6 (#30) | — | |
| W24 | OEM-A-4 | M800-A-14 | 0.5 | no route | Throttle position (VTA1) | — | |
| W25 | OEM-A-5 | M800-B-3 | 0.5 | no route | Coolant temperature (THW) | — | |
| W26 | OEM-B-4 | M800-A-18 | 0.5 | no route | EFI main relay control (MREL) | — | |
| W27 | OEM-B-6 | M800-A-1 | 0.5 | no route | Fuel pump relay (FPR) | — | |
| W28 | OEM-B-7 | M800-A-23 | 0.5 | no route | A/C clutch relay (ACMG) | — | |
| W29 | OEM-D-19 | M800-A-24 | 0.5 | no route | O2 heater 2 (HT2) | — | |
| W30 | OEM-D-20 | M800-A-31 | 0.5 | no route | O2 heater 1 (HT1) | — | |
| W31 | OEM-D-17 | M800-A-32 | 0.5 | no route | Cold start injector 1 (STJ1) | — | |
| W32 | OEM-D-8 | M800-A-33 | 0.5 | no route | ISC stepper coil 1 (ISC1) | — | |
| W33 | OEM-D-7 | M800-A-34 | 0.5 | no route | ISC stepper coil 2 (ISC2) | — | |
| W34 | OEM-D-6 | M800-A-27 | 0.5 | no route | ISC stepper coil 3 (ISC3) | — | |
| W35 | OEM-D-5 | M800-A-28 | 0.5 | no route | ISC stepper coil 4 (ISC4) | — | |
| W36 | OEM-B-5 | M800-A-29 | 0.5 | no route | Check-engine lamp (W) | — | |
| W37 | OEM-B-8 | M800-A-30 | 0.5 | no route | Fuel pump control (FC) | — | |
| W38 | OEM-A-17 | M800-A-15 | 0.5 | no route | O2 right front (OXR1) | — | |
| W39 | OEM-A-6 | M800-A-16 | 0.5 | no route | O2 left front (OXL1) | — | |
| W40 | OEM-B-11 | M800-A-17 | 0.5 | no route | O2 right rear (OXR2) | — | |
| W41 | OEM-B-24 | M800-A-25 | 0.5 | no route | O2 left rear (OXL2) | — | |
| W42 | OEM-A-16 | M800-B-4 | 0.5 | no route | Intake air temperature (THA) | — | |
| W43 | OEM-A-7 | M800-B-5 | 0.5 | no route | EGR temperature sensor | — | |
| W44 | OEM-C-2 | M800-B-8 | 0.5 | no route | Igniter 1 feedback (IGF1) | — | |
| W45 | OEM-C-10 | M800-B-9 | 0.5 | no route | Igniter 2 feedback (IGF2) | — | |
| W46 | OEM-A-19 | M800-B-10 | 0.5 | no route | Vehicle speed (SPD) | — | |
| W47 | OEM-A-9 | M800-B-11 | 0.5 | no route | Diagnostic test 1 (TE1) | — | |
| W48 | OEM-A-20 | M800-B-20 | 0.5 | no route | Diagnostic test 2 (TE2) | — | |
| W49 | OEM-A-14 | M800-B-21 | 0.5 | no route | Neutral start switch (NSW) | — | |
| W50 | OEM-A-2 | M800-B-22 | 0.5 | no route | Starter signal (STA) | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| connector | 3-1437290-7 | TE | Superseal 1.0 26-way plug | 1.000 | ea |
| connector | 4-1437290-0 | TE | Superseal 1.0 34-way plug, Key 1 | 1.000 | ea |
| terminal | 3-1447221-4 | TE | Superseal 1.0 socket terminal, 20 AWG (0.5 sq mm) | 42.000 | ea |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (21)
| 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. |
| error | REQUIRED_UNMAPPED | OEM-C-6 | Required OEM function "Cam sensor 2 + (G2+)" (trigger_in) is not connected to the new ECU. |
| warn | LOAD_UNKNOWN | M800-A-1 | M800-A-1 "AUX2" drives OEM-B-6 Fuel pump relay (FPR) (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | M800-A-18 | M800-A-18 "AUX1" drives OEM-B-4 EFI main relay control (MREL) (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | M800-A-23 | M800-A-23 "AUX3" drives OEM-B-7 A/C clutch relay (ACMG) (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | NET_FAMILY | OEM-A-14 ↔ M800-B-21 | OEM-A-14 "Neutral start switch (NSW)" [digital_in] is wired to M800-B-21 "AV7" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value. |
| warn | NET_FAMILY | OEM-A-2 ↔ M800-B-22 | OEM-A-2 "Starter signal (STA)" [digital_in] is wired to M800-B-22 "AV8" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value. |
| warn | NET_FAMILY | OEM-A-20 ↔ M800-B-20 | OEM-A-20 "Diagnostic test 2 (TE2)" [digital_in] is wired to M800-B-20 "Analog Voltage Input 6" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value. |
| info | NET_FAMILY | OEM-B-4 ↔ M800-A-18 | OEM-B-4 "EFI main relay control (MREL)" [low_side_out] is wired to M800-A-18 "AUX1" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-B-5 ↔ M800-A-29 | OEM-B-5 "Check-engine lamp (W)" [low_side_out] is wired to M800-A-29 "INJ7" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-B-6 ↔ M800-A-1 | OEM-B-6 "Fuel pump relay (FPR)" [low_side_out] is wired to M800-A-1 "AUX2" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-B-7 ↔ M800-A-23 | OEM-B-7 "A/C clutch relay (ACMG)" [low_side_out] is wired to M800-A-23 "AUX3" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-B-8 ↔ M800-A-30 | OEM-B-8 "Fuel pump control (FC)" [low_side_out] is wired to M800-A-30 "INJ8" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-D-17 ↔ M800-A-32 | OEM-D-17 "Cold start injector 1 (STJ1)" [low_side_out] is wired to M800-A-32 "AUX6" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-D-19 ↔ M800-A-24 | OEM-D-19 "O2 heater 2 (HT2)" [low_side_out] is wired to M800-A-24 "AUX4" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-D-20 ↔ M800-A-31 | OEM-D-20 "O2 heater 1 (HT1)" [low_side_out] is wired to M800-A-31 "AUX5" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-D-5 ↔ M800-A-28 | OEM-D-5 "ISC stepper coil 4 (ISC4)" [low_side_out] is wired to M800-A-28 "INJ6" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-D-6 ↔ M800-A-27 | OEM-D-6 "ISC stepper coil 3 (ISC3)" [low_side_out] is wired to M800-A-27 "INJ5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-D-7 ↔ M800-A-34 | OEM-D-7 "ISC stepper coil 2 (ISC2)" [low_side_out] is wired to M800-A-34 "AUX8" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-D-8 ↔ M800-A-33 | OEM-D-8 "ISC stepper coil 1 (ISC1)" [low_side_out] is wired to M800-A-33 "AUX7" [switch_out]. Configure this output as low side. |
| info | UNMAPPED | OEM | 12 optional OEM pins are not mapped: OEM-A-8 Knock/shield (KS); OEM-B-19 Stop light switch (BK); OEM-B-20 A/T kickdown switch (KD); OEM-B-23 A/C request (AC); OEM-C-1 TPS idle switch (IDL); OEM-C-11 Knock sensor 2 (KNK2); OEM-C-12 Check connector VF2; OEM-C-3 Knock sensor 1 (KNK1); 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-C 6: Cam sensor 2 + (G2+): no free cam_vr/cam_hall/frequency_in input on MoTeC M800 - 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); MoTeC M800 has no dedicated key-on input Not wired: - OEM-B 26: Battery constant (BATT): MoTeC M800 has no battery-constant input; not needed - OEM-C 3: Knock sensor 1 (KNK1): no free knock input on MoTeC M800 - OEM-C 11: Knock sensor 2 (KNK2): no free knock input on MoTeC M800 - OEM-A 8: Knock/shield (KS): no free knock input on MoTeC M800 - OEM-D 21: EGR solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on MoTeC M800 - OEM-D 22: Fuel pressure-up VSV (PR): no free low_side/relay_control/heater_low_side/ls_hs/injector on MoTeC M800 - OEM-D 4: Cold start injector (STJ): no free low_side/relay_control/heater_low_side/ls_hs/injector on MoTeC M800 - OEM-B 19: Stop light switch (BK): no free switch_in/frequency_in/analog_0_5 on MoTeC M800 - OEM-B 20: A/T kickdown switch (KD): no free switch_in/frequency_in/analog_0_5 on MoTeC M800 - OEM-B 23: A/C request (AC): no free switch_in/frequency_in/analog_0_5 on MoTeC M800 - OEM-C 1: TPS idle switch (IDL): no free switch_in/frequency_in/analog_0_5 on MoTeC M800 - OEM-C 4: Check connector VF1: no free analog_out on MoTeC M800 - OEM-C 12: Check connector VF2: no free analog_out on MoTeC M800
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | MoTeC M400/M600/M800/M880 Manual — Appendix L: Pin list by Function | https://starracecars.com/wp-content/uploads/resources/M400_M600_M800_M880_Manual_A5.pdf | archive | 2026-10-05 | b69bb8ffb674 |
| 4 | vendor_doc | MoTeC M800 OEM WRX56 Installation | https://motec.com.au | archive | 2026-10-05 | 2ca4be92bb65 |
| 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/ | — | — | — |