Lexus LS400 1989-97 (1UZ-FE non-VVTi) → MaxxECU MaxxECU STREET REV9+ (auto)
Lexus LS400 1989-97 (1UZ-FE non-VVTi) — MaxxECU — MaxxECU STREET
⚠ 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 | 36 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 | MAXXECUSTREE-C1-M4 | 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 | MAXXECUSTREE-C1-L4 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-A-18 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-C-15 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-C-16 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-0V-1 | MAXXECUSTREE-C1-H1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-0V-1 | MAXXECUSTREE-C1-H2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-A-11 | MAXXECUSTREE-C1-G1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-C-8 | MAXXECUSTREE-C1-H3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-C-7 | MAXXECUSTREE-C1-H4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-C-5 | MAXXECUSTREE-C1-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-C-13 | MAXXECUSTREE-C1-A3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-D-12 | MAXXECUSTREE-C1-K1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-D-11 | MAXXECUSTREE-C1-K2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-D-24 | MAXXECUSTREE-C1-M1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-D-25 | MAXXECUSTREE-C1-M2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-A-4 | MAXXECUSTREE-C1-G2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-A-5 | MAXXECUSTREE-C1-F1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-B-4 | MAXXECUSTREE-C1-B4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-B-6 | MAXXECUSTREE-C1-C4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-B-7 | MAXXECUSTREE-C1-D4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-D-19 | MAXXECUSTREE-C1-D1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-D-20 | MAXXECUSTREE-C1-A4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-D-17 | MAXXECUSTREE-C1-M3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-D-8 | MAXXECUSTREE-C1-L3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-A-17 | MAXXECUSTREE-C1-J3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-A-6 | MAXXECUSTREE-C1-J4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-A-16 | MAXXECUSTREE-C1-F2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-A-7 | MAXXECUSTREE-C1-J1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-C-2 | MAXXECUSTREE-C1-K3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-C-10 | MAXXECUSTREE-C1-K4 | 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 | MAXXECUSTREE-C1-G1 | MAXXECUSTREE-C1-H1 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 2 | MAXXECUSTREE-C1-G1 | MAXXECUSTREE-C1-L4 | open (OL) | 5 V sensor reference must not touch power ground | |
| 3 | MAXXECUSTREE-C1-M4 | MAXXECUSTREE-C1-H1 | open (OL) | +12 V supply must not touch sensor ground | |
| 4 | MAXXECUSTREE-C1-M4 | MAXXECUSTREE-C1-L4 | open (OL) | +12 V supply must not touch power ground | |
| 5 | MAXXECUSTREE-C1-G1 | MAXXECUSTREE-C1-M4 | 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
MAXXECUSTREE-C1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A2 | IGN 1 | — | W16 | — | 0.5 | OEM-C-5 | — | — | — |
| A3 | IGN 2 | — | W17 | — | 0.5 | OEM-C-13 | — | — | — |
| A4 | GPO 8/TACHO | — | W28 | — | 0.5 | OEM-D-20 | — | — | — |
| B2 | IGN 3 | — | — | — | — | — | — | — | — |
| B3 | IGN 4 | — | — | — | — | — | — | — | — |
| B4 | GPO 1 | — | W24 | — | 0.5 | OEM-B-4 | — | — | — |
| C2 | IGN 5 | — | — | — | — | — | — | — | — |
| C3 | IGN 6 | — | — | — | — | — | — | — | — |
| C4 | GPO 2 | — | W25 | — | 0.5 | OEM-B-6 | — | — | — |
| D1 | WBO2 Heater- | — | W27 | — | 0.5 | OEM-D-19 | — | — | — |
| D4 | GPO 3 | — | W26 | — | 0.5 | OEM-B-7 | — | — | — |
| E1 | CAN H | — | — | — | — | — | — | — | — |
| E2 | CAN L | — | — | — | — | — | — | — | — |
| E3 | GND Shield | — | — | — | — | — | — | — | — |
| F1 | CLT | — | W23 | — | 0.5 | OEM-A-5 | — | — | — |
| F2 | IAT | — | W33 | — | 0.5 | OEM-A-16 | — | — | — |
| F3 | WBO2 VREF | — | — | — | — | — | — | — | — |
| F4 | WBO2 VS | — | — | — | — | — | — | — | — |
| G1 | +5V sensor supply | — | W13 | — | 0.5 | OEM-A-11 | — | — | — |
| G2 | TPS/AIN | — | W22 | — | 0.5 | OEM-A-4 | — | — | — |
| G3 | WBO2 IP | — | — | — | — | — | — | — | — |
| G4 | WBO2 RCAL | — | — | — | — | — | — | — | — |
| H1 | Sensor GND | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| H2 | Trigger GND | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| H3 | TRIGGER | — | W14 | — | 0.5 | OEM-C-8 | — | — | — |
| H4 | HOME | — | W15 | — | 0.5 | OEM-C-7 | — | — | — |
| J1 | AIN 1 (temperature) | — | W34 | — | 0.5 | OEM-A-7 | — | — | — |
| J2 | AIN 2 (Temperature) | — | — | — | — | — | — | — | — |
| J3 | AIN 3 (0-5V) | — | W31 | — | 0.5 | OEM-A-17 | — | — | — |
| J4 | AIN 4 (0-5V) | — | W32 | — | 0.5 | OEM-A-6 | — | — | — |
| K1 | INJ 1 | — | W18 | — | 0.5 | OEM-D-12 | — | — | — |
| K2 | INJ 2 | — | W19 | — | 0.5 | OEM-D-11 | — | — | — |
| K3 | DIN 1 | — | W35 | — | 0.5 | OEM-C-2 | — | — | — |
| K4 | DIN 2 | — | W36 | — | 0.5 | OEM-C-10 | — | — | — |
| L3 | INJ 6 | — | W30 | — | 0.5 | OEM-D-8 | — | — | — |
| L4 | Engine GND | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| M1 | INJ 3 | — | W20 | — | 0.5 | OEM-D-24 | — | — | — |
| M2 | INJ 4 | — | W21 | — | 0.5 | OEM-D-25 | — | — | — |
| M3 | INJ 5 | — | W29 | — | 0.5 | OEM-D-17 | — | — | — |
| M4 | +12V ECU power supply | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ignition switch (IGSW) | — | — | — | — | — | — | — | — |
| 11 | Sensor supply +5V (VC) | — | W13 | — | 0.5 | MAXXECUSTREE-C1-G1 | — | — | — |
| 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) | — | W33 | — | 0.5 | MAXXECUSTREE-C1-F2 | — | — | — |
| 17 | O2 right front (OXR1) | — | W31 | — | 0.5 | MAXXECUSTREE-C1-J3 | — | — | — |
| 18 | Sensor ground (E2) | — | W8 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | Vehicle speed (SPD) | — | — | — | — | — | — | — | — |
| 2 | Starter signal (STA) | — | — | — | — | — | — | — | — |
| 20 | Diagnostic test 2 (TE2) | — | — | — | — | — | — | — | — |
| 22 | Power ground (E1) | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| 4 | Throttle position (VTA1) | — | W22 | — | 0.5 | MAXXECUSTREE-C1-G2 | — | — | — |
| 5 | Coolant temperature (THW) | — | W23 | — | 0.5 | MAXXECUSTREE-C1-F1 | — | — | — |
| 6 | O2 left front (OXL1) | — | W32 | — | 0.5 | MAXXECUSTREE-C1-J4 | — | — | — |
| 7 | EGR temperature sensor | — | W34 | — | 0.5 | MAXXECUSTREE-C1-J1 | — | — | — |
| 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) | — | — | — | — | — | — | — | — |
| 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) | — | W24 | — | 0.5 | MAXXECUSTREE-C1-B4 | — | — | — |
| 5 | Check-engine lamp (W) | — | — | — | — | — | — | — | — |
| 6 | Fuel pump relay (FPR) | — | W25 | — | 0.5 | MAXXECUSTREE-C1-C4 | — | — | — |
| 7 | A/C clutch relay (ACMG) | — | W26 | — | 0.5 | MAXXECUSTREE-C1-D4 | — | — | — |
| 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) | — | W36 | — | 0.5 | MAXXECUSTREE-C1-K4 | — | — | — |
| 11 | Knock sensor 2 (KNK2) | — | — | — | — | — | — | — | — |
| 12 | Check connector VF2 | — | — | — | — | — | — | — | — |
| 13 | Ignition 2 (IGT2) | — | W17 | — | 0.5 | MAXXECUSTREE-C1-A3 | — | — | — |
| 15 | Cam sensor ground (G-) | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| 16 | Crank sensor - (NE-) | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 2 | Igniter 1 feedback (IGF1) | — | W35 | — | 0.5 | MAXXECUSTREE-C1-K3 | — | — | — |
| 3 | Knock sensor 1 (KNK1) | — | — | — | — | — | — | — | — |
| 4 | Check connector VF1 | — | — | — | — | — | — | — | — |
| 5 | Ignition 1 (IGT1) | — | W16 | — | 0.5 | MAXXECUSTREE-C1-A2 | — | — | — |
| 6 | Cam sensor 2 + (G2+) | — | — | — | — | — | — | — | — |
| 7 | Cam sensor 1 + (G1+) | — | W15 | — | 0.5 | MAXXECUSTREE-C1-H4 | — | — | — |
| 8 | Crank sensor + (NE+) | — | W14 | — | 0.5 | MAXXECUSTREE-C1-H3 | — | — | — |
OEM-D
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 11 | Injector 2&8 (#20) | — | W19 | — | 0.5 | MAXXECUSTREE-C1-K2 | — | — | — |
| 12 | Injector 1&7 (#10) | — | W18 | — | 0.5 | MAXXECUSTREE-C1-K1 | — | — | — |
| 13 | Power ground (E01) | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 17 | Cold start injector 1 (STJ1) | — | W29 | — | 0.5 | MAXXECUSTREE-C1-M3 | — | — | — |
| 19 | O2 heater 2 (HT2) | — | W27 | — | 0.5 | MAXXECUSTREE-C1-D1 | — | — | — |
| 20 | O2 heater 1 (HT1) | — | W28 | — | 0.5 | MAXXECUSTREE-C1-A4 | — | — | — |
| 21 | EGR solenoid | — | — | — | — | — | — | — | — |
| 22 | Fuel pressure-up VSV (PR) | — | — | — | — | — | — | — | — |
| 24 | Injector 3&5 (#40) | — | W20 | — | 0.5 | MAXXECUSTREE-C1-M1 | — | — | — |
| 25 | Injector 4&6 (#30) | — | W21 | — | 0.5 | MAXXECUSTREE-C1-M2 | — | — | — |
| 26 | Power ground (E02) | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 4 | Cold start injector (STJ) | — | — | — | — | — | — | — | — |
| 5 | ISC stepper coil 4 (ISC4) | — | — | — | — | — | — | — | — |
| 6 | ISC stepper coil 3 (ISC3) | — | — | — | — | — | — | — | — |
| 7 | ISC stepper coil 2 (ISC2) | — | — | — | — | — | — | — | — |
| 8 | ISC stepper coil 1 (ISC1) | — | W30 | — | 0.5 | MAXXECUSTREE-C1-L3 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W8 | — | 0.5 | OEM-A-18 | — | — | — |
| 1 | — | — | W9 | — | 0.5 | OEM-C-15 | — | — | — |
| 1 | — | — | W10 | — | 0.5 | OEM-C-16 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | MAXXECUSTREE-C1-H1 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | MAXXECUSTREE-C1-H2 | — | — | — |
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 | MAXXECUSTREE-C1-M4 | — | — | — |
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 | MAXXECUSTREE-C1-L4 | — | — | — |
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 | MAXXECUSTREE-C1-G1 | +5V sensor supply | vref | single_source | |
| OEM-A-12 | EFI main relay (B+) | power_in | MAXXECUSTREE-C1-M4 | +12V ECU power supply | power_in | single_source | |
| OEM-A-13 | EFI main relay (B1+) | power_in | MAXXECUSTREE-C1-M4 | +12V ECU power supply | power_in | single_source | |
| OEM-A-14 | Neutral start switch (NSW) | digital_in | — | — | — | single_source | |
| OEM-A-16 | Intake air temperature (THA) | temp_in | MAXXECUSTREE-C1-F2 | IAT | temp_in | single_source | |
| OEM-A-17 | O2 right front (OXR1) | lambda_nb_in | MAXXECUSTREE-C1-J3 | AIN 3 (0-5V) | analog_in | single_source | |
| OEM-A-18 | Sensor ground (E2) | sensor_ground | MAXXECUSTREE-C1-H1 + MAXXECUSTREE-C1-H2 | Sensor GND + Trigger GND | 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 | MAXXECUSTREE-C1-L4 | Engine GND | ground | single_source | |
| OEM-A-4 | Throttle position (VTA1) | analog_in | MAXXECUSTREE-C1-G2 | TPS/AIN | analog_in | single_source | |
| OEM-A-5 | Coolant temperature (THW) | temp_in | MAXXECUSTREE-C1-F1 | CLT | temp_in | single_source | |
| OEM-A-6 | O2 left front (OXL1) | lambda_nb_in | MAXXECUSTREE-C1-J4 | AIN 4 (0-5V) | analog_in | single_source | |
| OEM-A-7 | EGR temperature sensor | temp_in | MAXXECUSTREE-C1-J1 | AIN 1 (temperature) | 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 | — | — | — | 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 | MAXXECUSTREE-C1-B4 | GPO 1 | low_side_out | single_source | |
| OEM-B-5 | Check-engine lamp (W) | low_side_out | — | — | — | single_source | |
| OEM-B-6 | Fuel pump relay (FPR) | low_side_out | MAXXECUSTREE-C1-C4 | GPO 2 | low_side_out | single_source | |
| OEM-B-7 | A/C clutch relay (ACMG) | low_side_out | MAXXECUSTREE-C1-D4 | GPO 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 | MAXXECUSTREE-C1-K4 | DIN 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 | MAXXECUSTREE-C1-A3 | IGN 2 | ignition_out | single_source | |
| OEM-C-15 | Cam sensor ground (G-) | sensor_ground | MAXXECUSTREE-C1-H1 + MAXXECUSTREE-C1-H2 | Sensor GND + Trigger GND | sensor_ground | single_source | |
| OEM-C-16 | Crank sensor - (NE-) | sensor_ground | MAXXECUSTREE-C1-H1 + MAXXECUSTREE-C1-H2 | Sensor GND + Trigger GND | sensor_ground | single_source | |
| OEM-C-2 | Igniter 1 feedback (IGF1) | digital_in | MAXXECUSTREE-C1-K3 | DIN 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 | MAXXECUSTREE-C1-A2 | IGN 1 | ignition_out | single_source | |
| OEM-C-6 | Cam sensor 2 + (G2+) | trigger_in | — | — | — | single_source | |
| OEM-C-7 | Cam sensor 1 + (G1+) | trigger_in | MAXXECUSTREE-C1-H4 | HOME | trigger_in | single_source | |
| OEM-C-8 | Crank sensor + (NE+) | trigger_in | MAXXECUSTREE-C1-H3 | TRIGGER | trigger_in | single_source | |
| OEM-D-11 | Injector 2&8 (#20) | injector_out | MAXXECUSTREE-C1-K2 | INJ 2 | injector_out | single_source | |
| OEM-D-12 | Injector 1&7 (#10) | injector_out | MAXXECUSTREE-C1-K1 | INJ 1 | injector_out | single_source | |
| OEM-D-13 | Power ground (E01) | ground | MAXXECUSTREE-C1-L4 | Engine GND | ground | single_source | |
| OEM-D-17 | Cold start injector 1 (STJ1) | low_side_out | MAXXECUSTREE-C1-M3 | INJ 5 | injector_out | single_source | |
| OEM-D-19 | O2 heater 2 (HT2) | low_side_out | MAXXECUSTREE-C1-D1 | WBO2 Heater- | low_side_out | single_source | |
| OEM-D-20 | O2 heater 1 (HT1) | low_side_out | MAXXECUSTREE-C1-A4 | GPO 8/TACHO | 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 | MAXXECUSTREE-C1-M1 | INJ 3 | injector_out | single_source | |
| OEM-D-25 | Injector 4&6 (#30) | injector_out | MAXXECUSTREE-C1-M2 | INJ 4 | injector_out | single_source | |
| OEM-D-26 | Power ground (E02) | ground | MAXXECUSTREE-C1-L4 | Engine GND | 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 | — | — | — | single_source | |
| OEM-D-6 | ISC stepper coil 3 (ISC3) | low_side_out | — | — | — | single_source | |
| OEM-D-7 | ISC stepper coil 2 (ISC2) | low_side_out | — | — | — | single_source | |
| OEM-D-8 | ISC stepper coil 1 (ISC1) | low_side_out | MAXXECUSTREE-C1-L3 | INJ 6 | injector_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 | MAXXECUSTREE-C1-M4 | 0.85 | no route | +12V ECU power supply | — | |
| 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 | MAXXECUSTREE-C1-L4 | 0.85 | no route | Engine GND | — | |
| W8 | OEM-A-18 | SP-0V-1 | 0.5 | no route | Sensor ground (E2) | — | |
| W9 | OEM-C-15 | SP-0V-1 | 0.5 | no route | Cam sensor ground (G-) | — | |
| W10 | OEM-C-16 | SP-0V-1 | 0.5 | no route | Crank sensor - (NE-) | — | |
| W11 | SP-0V-1 | MAXXECUSTREE-C1-H1 | 0.5 | no route | Sensor GND | — | |
| W12 | SP-0V-1 | MAXXECUSTREE-C1-H2 | 0.5 | no route | Trigger GND | — | |
| W13 | OEM-A-11 | MAXXECUSTREE-C1-G1 | 0.5 | no route | Sensor supply +5V (VC) | — | |
| W14 | OEM-C-8 | MAXXECUSTREE-C1-H3 | 0.5 | no route | Crank sensor + (NE+) | — | |
| W15 | OEM-C-7 | MAXXECUSTREE-C1-H4 | 0.5 | no route | Cam sensor 1 + (G1+) | — | |
| W16 | OEM-C-5 | MAXXECUSTREE-C1-A2 | 0.5 | no route | Ignition 1 (IGT1) | — | |
| W17 | OEM-C-13 | MAXXECUSTREE-C1-A3 | 0.5 | no route | Ignition 2 (IGT2) | — | |
| W18 | OEM-D-12 | MAXXECUSTREE-C1-K1 | 0.5 | no route | Injector 1&7 (#10) | — | |
| W19 | OEM-D-11 | MAXXECUSTREE-C1-K2 | 0.5 | no route | Injector 2&8 (#20) | — | |
| W20 | OEM-D-24 | MAXXECUSTREE-C1-M1 | 0.5 | no route | Injector 3&5 (#40) | — | |
| W21 | OEM-D-25 | MAXXECUSTREE-C1-M2 | 0.5 | no route | Injector 4&6 (#30) | — | |
| W22 | OEM-A-4 | MAXXECUSTREE-C1-G2 | 0.5 | no route | Throttle position (VTA1) | — | |
| W23 | OEM-A-5 | MAXXECUSTREE-C1-F1 | 0.5 | no route | Coolant temperature (THW) | — | |
| W24 | OEM-B-4 | MAXXECUSTREE-C1-B4 | 0.5 | no route | EFI main relay control (MREL) | — | |
| W25 | OEM-B-6 | MAXXECUSTREE-C1-C4 | 0.5 | no route | Fuel pump relay (FPR) | — | |
| W26 | OEM-B-7 | MAXXECUSTREE-C1-D4 | 0.5 | no route | A/C clutch relay (ACMG) | — | |
| W27 | OEM-D-19 | MAXXECUSTREE-C1-D1 | 0.5 | no route | O2 heater 2 (HT2) | — | |
| W28 | OEM-D-20 | MAXXECUSTREE-C1-A4 | 0.5 | no route | O2 heater 1 (HT1) | — | |
| W29 | OEM-D-17 | MAXXECUSTREE-C1-M3 | 0.5 | no route | Cold start injector 1 (STJ1) | — | |
| W30 | OEM-D-8 | MAXXECUSTREE-C1-L3 | 0.5 | no route | ISC stepper coil 1 (ISC1) | — | |
| W31 | OEM-A-17 | MAXXECUSTREE-C1-J3 | 0.5 | no route | O2 right front (OXR1) | — | |
| W32 | OEM-A-6 | MAXXECUSTREE-C1-J4 | 0.5 | no route | O2 left front (OXL1) | — | |
| W33 | OEM-A-16 | MAXXECUSTREE-C1-F2 | 0.5 | no route | Intake air temperature (THA) | — | |
| W34 | OEM-A-7 | MAXXECUSTREE-C1-J1 | 0.5 | no route | EGR temperature sensor | — | |
| W35 | OEM-C-2 | MAXXECUSTREE-C1-K3 | 0.5 | no route | Igniter 1 feedback (IGF1) | — | |
| W36 | OEM-C-10 | MAXXECUSTREE-C1-K4 | 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 (8)
| 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 | MAXXECUSTREE-C1-B4 | MAXXECUSTREE-C1-B4 "GPO 1" 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 | MAXXECUSTREE-C1-C4 | MAXXECUSTREE-C1-C4 "GPO 2" 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 | MAXXECUSTREE-C1-D4 | MAXXECUSTREE-C1-D4 "GPO 3" drives OEM-B-7 A/C clutch relay (ACMG) (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| info | NET_FAMILY | OEM-D-17 ↔ MAXXECUSTREE-C1-M3 | OEM-D-17 "Cold start injector 1 (STJ1)" [low_side_out] is wired to MAXXECUSTREE-C1-M3 "INJ 5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-D-8 ↔ MAXXECUSTREE-C1-L3 | OEM-D-8 "ISC stepper coil 1 (ISC1)" [low_side_out] is wired to MAXXECUSTREE-C1-L3 "INJ 6" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | UNMAPPED | OEM | 24 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-8 Knock/shield (KS); OEM-A-9 Diagnostic test 1 (TE1); OEM-B-11 O2 right rear (OXR2); 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-5 Check-engine lamp (W); 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-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); OEM-D-5 ISC stepper coil 4 (ISC4); OEM-D-6 ISC stepper coil 3 (ISC3); OEM-D-7 ISC stepper coil 2 (ISC2) |
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 MaxxECU MaxxECU STREET - 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); MaxxECU MaxxECU STREET has no dedicated key-on input Not wired: - OEM-B 26: Battery constant (BATT): MaxxECU MaxxECU STREET has no battery-constant input; not needed - OEM-C 3: Knock sensor 1 (KNK1): no free knock input on MaxxECU MaxxECU STREET - OEM-C 11: Knock sensor 2 (KNK2): no free knock input on MaxxECU MaxxECU STREET - OEM-A 8: Knock/shield (KS): no free knock input on MaxxECU MaxxECU STREET - OEM-D 7: ISC stepper coil 2 (ISC2): no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU STREET - OEM-D 6: ISC stepper coil 3 (ISC3): no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU STREET - OEM-D 5: ISC stepper coil 4 (ISC4): no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU STREET - OEM-B 5: Check-engine lamp (W): no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU STREET - OEM-B 8: Fuel pump control (FC): no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU STREET - OEM-D 21: EGR solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU STREET - OEM-D 22: Fuel pressure-up VSV (PR): no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU STREET - OEM-D 4: Cold start injector (STJ): no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU STREET - OEM-B 11: O2 right rear (OXR2): no free o2_narrowband/analog_0_5 on MaxxECU MaxxECU STREET - OEM-B 24: O2 left rear (OXL2): no free o2_narrowband/analog_0_5 on MaxxECU MaxxECU STREET - OEM-A 19: Vehicle speed (SPD): no free frequency_in/switch_in on MaxxECU MaxxECU STREET - OEM-A 9: Diagnostic test 1 (TE1): no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU STREET - OEM-A 20: Diagnostic test 2 (TE2): no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU STREET - OEM-A 14: Neutral start switch (NSW): no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU STREET - OEM-A 2: Starter signal (STA): no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU STREET - OEM-B 19: Stop light switch (BK): no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU STREET - OEM-B 20: A/T kickdown switch (KD): no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU STREET - OEM-B 23: A/C request (AC): no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU STREET - OEM-C 1: TPS idle switch (IDL): no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU STREET - OEM-C 4: Check connector VF1: no free analog_out on MaxxECU MaxxECU STREET - OEM-C 12: Check connector VF2: no free analog_out on MaxxECU MaxxECU STREET
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | MaxxECU GEN1 pinout (MINI / STREET / SPORT / V1 / RACE / PRO) | http://www.maxxecu.com/webhelp/wirings-maxxecu_pinout.html | archive | 2026-10-05 | 2e37b6814690 |
| 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/ | — | — | — |