Lexus LS400 1989-97 (1UZ-FE non-VVTi) → Link G4X MonsoonX (auto)
Lexus LS400 1989-97 (1UZ-FE non-VVTi) — Link — G4X MonsoonX
⚠ 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 | 37 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 | G4XMONSOONX-A-A5 | 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 | G4XMONSOONX-A-A25 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | G4XMONSOONX-A-A34 | 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 | G4XMONSOONX-A-A24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-A-11 | G4XMONSOONX-A-A32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-C-8 | G4XMONSOONX-A-A8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-C-7 | G4XMONSOONX-A-A9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-C-6 | G4XMONSOONX-A-A30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-C-3 | G4XMONSOONX-A-A6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-C-5 | G4XMONSOONX-A-A13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-C-13 | G4XMONSOONX-A-A12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-D-12 | G4XMONSOONX-A-A4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-D-11 | G4XMONSOONX-A-A3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-D-24 | G4XMONSOONX-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-D-25 | G4XMONSOONX-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-A-4 | G4XMONSOONX-A-A17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-A-5 | G4XMONSOONX-A-A15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-B-4 | G4XMONSOONX-A-A21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-B-6 | G4XMONSOONX-A-A20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-B-7 | G4XMONSOONX-A-A19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-D-19 | G4XMONSOONX-A-A18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-D-20 | G4XMONSOONX-A-A27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-D-17 | G4XMONSOONX-A-A26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-A-17 | G4XMONSOONX-A-A22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-A-6 | G4XMONSOONX-A-A33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-B-11 | G4XMONSOONX-A-A14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-A-16 | G4XMONSOONX-A-A16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-C-2 | G4XMONSOONX-A-A31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-C-10 | G4XMONSOONX-A-A23 | 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 | G4XMONSOONX-A-A32 | G4XMONSOONX-A-A24 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 2 | G4XMONSOONX-A-A32 | G4XMONSOONX-A-A25 | open (OL) | 5 V sensor reference must not touch power ground | |
| 3 | G4XMONSOONX-A-A5 | G4XMONSOONX-A-A24 | open (OL) | +12 V supply must not touch sensor ground | |
| 4 | G4XMONSOONX-A-A5 | G4XMONSOONX-A-A25 | open (OL) | +12 V supply must not touch power ground | |
| 5 | G4XMONSOONX-A-A32 | G4XMONSOONX-A-A5 | 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
G4XMONSOONX-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A1 | Injector 4 | — | W23 | — | 0.5 | OEM-D-25 | — | — | — |
| A10 | Ignition 4 | — | — | — | — | — | — | — | — |
| A11 | Ignition 3 | — | — | — | — | — | — | — | — |
| A12 | Ignition 2 | — | W19 | — | 0.5 | OEM-C-13 | — | — | — |
| A13 | Ignition 1 | — | W18 | — | 0.5 | OEM-C-5 | — | — | — |
| A14 | Analog Volt 4 | — | W34 | — | 0.5 | OEM-B-11 | — | — | — |
| A15 | Analog Temp 1 | — | W25 | — | 0.5 | OEM-A-5 | — | — | — |
| A16 | Analog Temp 2 | — | W35 | — | 0.5 | OEM-A-16 | — | — | — |
| A17 | Analog Volt 1 | — | W24 | — | 0.5 | OEM-A-4 | — | — | — |
| A18 | Aux 4 | — | W29 | — | 0.5 | OEM-D-19 | — | — | — |
| A19 | Aux 3 | — | W28 | — | 0.5 | OEM-B-7 | — | — | — |
| A2 | Injector 3 | — | W22 | — | 0.5 | OEM-D-24 | — | — | — |
| A20 | Aux 2 | — | W27 | — | 0.5 | OEM-B-6 | — | — | — |
| A21 | Aux 1 | — | W26 | — | 0.5 | OEM-B-4 | — | — | — |
| A22 | Analog Volt 2 | — | W32 | — | 0.5 | OEM-A-17 | — | — | — |
| A23 | Digital Input 3 | — | W37 | — | 0.5 | OEM-C-10 | — | — | — |
| A24 | Sensor Ground | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| A25 | System Ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| A26 | Aux 6 | — | W31 | — | 0.5 | OEM-D-17 | — | — | — |
| A27 | Aux 5 | — | W30 | — | 0.5 | OEM-D-20 | — | — | — |
| A28 | CAN H | — | — | — | — | — | — | — | — |
| A29 | CAN L | — | — | — | — | — | — | — | — |
| A3 | Injector 2 | — | W21 | — | 0.5 | OEM-D-11 | — | — | — |
| A30 | Digital Input 1 | — | W16 | — | 0.5 | OEM-C-6 | — | — | — |
| A31 | Digital Input 2 | — | W36 | — | 0.5 | OEM-C-2 | — | — | — |
| A32 | +5V Out | — | W13 | — | 0.5 | OEM-A-11 | — | — | — |
| A33 | Analog Volt 3 | — | W33 | — | 0.5 | OEM-A-6 | — | — | — |
| A34 | System Ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| A4 | Injector 1 | — | W20 | — | 0.5 | OEM-D-12 | — | — | — |
| A5 | +14V ECU Power | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| A6 | Knock 1 / Digital Input 4 | — | W17 | — | 0.5 | OEM-C-3 | — | — | — |
| A7 | Shield Ground | — | — | — | — | — | — | — | — |
| A8 | Trigger 1 | — | W14 | — | 0.5 | OEM-C-8 | — | — | — |
| A9 | Trigger 2 | — | W15 | — | 0.5 | OEM-C-7 | — | — | — |
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 | G4XMONSOONX-A-A32 | — | — | — |
| 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) | — | W35 | — | 0.5 | G4XMONSOONX-A-A16 | — | — | — |
| 17 | O2 right front (OXR1) | — | W32 | — | 0.5 | G4XMONSOONX-A-A22 | — | — | — |
| 18 | Sensor ground (E2) | — | W9 | — | 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) | — | W24 | — | 0.5 | G4XMONSOONX-A-A17 | — | — | — |
| 5 | Coolant temperature (THW) | — | W25 | — | 0.5 | G4XMONSOONX-A-A15 | — | — | — |
| 6 | O2 left front (OXL1) | — | W33 | — | 0.5 | G4XMONSOONX-A-A33 | — | — | — |
| 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) | — | W34 | — | 0.5 | G4XMONSOONX-A-A14 | — | — | — |
| 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) | — | W26 | — | 0.5 | G4XMONSOONX-A-A21 | — | — | — |
| 5 | Check-engine lamp (W) | — | — | — | — | — | — | — | — |
| 6 | Fuel pump relay (FPR) | — | W27 | — | 0.5 | G4XMONSOONX-A-A20 | — | — | — |
| 7 | A/C clutch relay (ACMG) | — | W28 | — | 0.5 | G4XMONSOONX-A-A19 | — | — | — |
| 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) | — | W37 | — | 0.5 | G4XMONSOONX-A-A23 | — | — | — |
| 11 | Knock sensor 2 (KNK2) | — | — | — | — | — | — | — | — |
| 12 | Check connector VF2 | — | — | — | — | — | — | — | — |
| 13 | Ignition 2 (IGT2) | — | W19 | — | 0.5 | G4XMONSOONX-A-A12 | — | — | — |
| 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) | — | W36 | — | 0.5 | G4XMONSOONX-A-A31 | — | — | — |
| 3 | Knock sensor 1 (KNK1) | — | W17 | — | 0.5 | G4XMONSOONX-A-A6 | — | — | — |
| 4 | Check connector VF1 | — | — | — | — | — | — | — | — |
| 5 | Ignition 1 (IGT1) | — | W18 | — | 0.5 | G4XMONSOONX-A-A13 | — | — | — |
| 6 | Cam sensor 2 + (G2+) | — | W16 | — | 0.5 | G4XMONSOONX-A-A30 | — | — | — |
| 7 | Cam sensor 1 + (G1+) | — | W15 | — | 0.5 | G4XMONSOONX-A-A9 | — | — | — |
| 8 | Crank sensor + (NE+) | — | W14 | — | 0.5 | G4XMONSOONX-A-A8 | — | — | — |
OEM-D
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 11 | Injector 2&8 (#20) | — | W21 | — | 0.5 | G4XMONSOONX-A-A3 | — | — | — |
| 12 | Injector 1&7 (#10) | — | W20 | — | 0.5 | G4XMONSOONX-A-A4 | — | — | — |
| 13 | Power ground (E01) | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 17 | Cold start injector 1 (STJ1) | — | W31 | — | 0.5 | G4XMONSOONX-A-A26 | — | — | — |
| 19 | O2 heater 2 (HT2) | — | W29 | — | 0.5 | G4XMONSOONX-A-A18 | — | — | — |
| 20 | O2 heater 1 (HT1) | — | W30 | — | 0.5 | G4XMONSOONX-A-A27 | — | — | — |
| 21 | EGR solenoid | — | — | — | — | — | — | — | — |
| 22 | Fuel pressure-up VSV (PR) | — | — | — | — | — | — | — | — |
| 24 | Injector 3&5 (#40) | — | W22 | — | 0.5 | G4XMONSOONX-A-A2 | — | — | — |
| 25 | Injector 4&6 (#30) | — | W23 | — | 0.5 | G4XMONSOONX-A-A1 | — | — | — |
| 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) | — | — | — | — | — | — | — | — |
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 | G4XMONSOONX-A-A24 | — | — | — |
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 | G4XMONSOONX-A-A5 | — | — | — |
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 | G4XMONSOONX-A-A25 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | G4XMONSOONX-A-A34 | — | — | — |
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 | G4XMONSOONX-A-A32 | +5V Out | vref | single_source | |
| OEM-A-12 | EFI main relay (B+) | power_in | G4XMONSOONX-A-A5 | +14V ECU Power | power_in | single_source | |
| OEM-A-13 | EFI main relay (B1+) | power_in | G4XMONSOONX-A-A5 | +14V ECU Power | power_in | single_source | |
| OEM-A-14 | Neutral start switch (NSW) | digital_in | — | — | — | single_source | |
| OEM-A-16 | Intake air temperature (THA) | temp_in | G4XMONSOONX-A-A16 | Analog Temp 2 | temp_in | single_source | |
| OEM-A-17 | O2 right front (OXR1) | lambda_nb_in | G4XMONSOONX-A-A22 | Analog Volt 2 | analog_in | single_source | |
| OEM-A-18 | Sensor ground (E2) | sensor_ground | G4XMONSOONX-A-A24 | 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 | G4XMONSOONX-A-A25 + G4XMONSOONX-A-A34 | System Ground + System Ground | ground | single_source | |
| OEM-A-4 | Throttle position (VTA1) | analog_in | G4XMONSOONX-A-A17 | Analog Volt 1 | analog_in | single_source | |
| OEM-A-5 | Coolant temperature (THW) | temp_in | G4XMONSOONX-A-A15 | Analog Temp 1 | temp_in | single_source | |
| OEM-A-6 | O2 left front (OXL1) | lambda_nb_in | G4XMONSOONX-A-A33 | Analog 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 | G4XMONSOONX-A-A14 | Analog 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 | G4XMONSOONX-A-A21 | Aux 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 | G4XMONSOONX-A-A20 | Aux 2 | low_side_out | single_source | |
| OEM-B-7 | A/C clutch relay (ACMG) | low_side_out | G4XMONSOONX-A-A19 | Aux 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 | G4XMONSOONX-A-A23 | Digital Input 3 | 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 | G4XMONSOONX-A-A12 | Ignition 2 | ignition_out | single_source | |
| OEM-C-15 | Cam sensor ground (G-) | sensor_ground | G4XMONSOONX-A-A24 | Sensor Ground | sensor_ground | single_source | |
| OEM-C-16 | Crank sensor - (NE-) | sensor_ground | G4XMONSOONX-A-A24 | Sensor Ground | sensor_ground | single_source | |
| OEM-C-2 | Igniter 1 feedback (IGF1) | digital_in | G4XMONSOONX-A-A31 | Digital Input 2 | digital_in | single_source | |
| OEM-C-3 | Knock sensor 1 (KNK1) | knock_in | G4XMONSOONX-A-A6 | Knock 1 / Digital Input 4 | knock_in | single_source | |
| OEM-C-4 | Check connector VF1 | analog_out | — | — | — | single_source | |
| OEM-C-5 | Ignition 1 (IGT1) | ignition_out | G4XMONSOONX-A-A13 | Ignition 1 | ignition_out | single_source | |
| OEM-C-6 | Cam sensor 2 + (G2+) | trigger_in | G4XMONSOONX-A-A30 | Digital Input 1 | digital_in | single_source | |
| OEM-C-7 | Cam sensor 1 + (G1+) | trigger_in | G4XMONSOONX-A-A9 | Trigger 2 | trigger_in | single_source | |
| OEM-C-8 | Crank sensor + (NE+) | trigger_in | G4XMONSOONX-A-A8 | Trigger 1 | trigger_in | single_source | |
| OEM-D-11 | Injector 2&8 (#20) | injector_out | G4XMONSOONX-A-A3 | Injector 2 | injector_out | single_source | |
| OEM-D-12 | Injector 1&7 (#10) | injector_out | G4XMONSOONX-A-A4 | Injector 1 | injector_out | single_source | |
| OEM-D-13 | Power ground (E01) | ground | G4XMONSOONX-A-A25 + G4XMONSOONX-A-A34 | System Ground + System Ground | ground | single_source | |
| OEM-D-17 | Cold start injector 1 (STJ1) | low_side_out | G4XMONSOONX-A-A26 | Aux 6 | low_side_out | single_source | |
| OEM-D-19 | O2 heater 2 (HT2) | low_side_out | G4XMONSOONX-A-A18 | Aux 4 | low_side_out | single_source | |
| OEM-D-20 | O2 heater 1 (HT1) | low_side_out | G4XMONSOONX-A-A27 | Aux 5 | 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 | G4XMONSOONX-A-A2 | Injector 3 | injector_out | single_source | |
| OEM-D-25 | Injector 4&6 (#30) | injector_out | G4XMONSOONX-A-A1 | Injector 4 | injector_out | single_source | |
| OEM-D-26 | Power ground (E02) | ground | G4XMONSOONX-A-A25 + G4XMONSOONX-A-A34 | System Ground + System 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 | — | — | — | 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 | — | — | — | 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 | G4XMONSOONX-A-A5 | 0.85 | no route | +14V ECU Power | — | |
| 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 | G4XMONSOONX-A-A25 | 0.85 | no route | System Ground | — | |
| W8 | SP-GND-1 | G4XMONSOONX-A-A34 | 0.85 | no route | System Ground | — | |
| 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 | G4XMONSOONX-A-A24 | 0.5 | no route | Sensor Ground | — | |
| W13 | OEM-A-11 | G4XMONSOONX-A-A32 | 0.5 | no route | Sensor supply +5V (VC) | — | |
| W14 | OEM-C-8 | G4XMONSOONX-A-A8 | 0.5 | no route | Crank sensor + (NE+) | — | |
| W15 | OEM-C-7 | G4XMONSOONX-A-A9 | 0.5 | no route | Cam sensor 1 + (G1+) | — | |
| W16 | OEM-C-6 | G4XMONSOONX-A-A30 | 0.5 | no route | Cam sensor 2 + (G2+) | — | |
| W17 | OEM-C-3 | G4XMONSOONX-A-A6 | 0.5 | no route | Knock sensor 1 (KNK1) | — | |
| W18 | OEM-C-5 | G4XMONSOONX-A-A13 | 0.5 | no route | Ignition 1 (IGT1) | — | |
| W19 | OEM-C-13 | G4XMONSOONX-A-A12 | 0.5 | no route | Ignition 2 (IGT2) | — | |
| W20 | OEM-D-12 | G4XMONSOONX-A-A4 | 0.5 | no route | Injector 1&7 (#10) | — | |
| W21 | OEM-D-11 | G4XMONSOONX-A-A3 | 0.5 | no route | Injector 2&8 (#20) | — | |
| W22 | OEM-D-24 | G4XMONSOONX-A-A2 | 0.5 | no route | Injector 3&5 (#40) | — | |
| W23 | OEM-D-25 | G4XMONSOONX-A-A1 | 0.5 | no route | Injector 4&6 (#30) | — | |
| W24 | OEM-A-4 | G4XMONSOONX-A-A17 | 0.5 | no route | Throttle position (VTA1) | — | |
| W25 | OEM-A-5 | G4XMONSOONX-A-A15 | 0.5 | no route | Coolant temperature (THW) | — | |
| W26 | OEM-B-4 | G4XMONSOONX-A-A21 | 0.5 | no route | EFI main relay control (MREL) | — | |
| W27 | OEM-B-6 | G4XMONSOONX-A-A20 | 0.5 | no route | Fuel pump relay (FPR) | — | |
| W28 | OEM-B-7 | G4XMONSOONX-A-A19 | 0.5 | no route | A/C clutch relay (ACMG) | — | |
| W29 | OEM-D-19 | G4XMONSOONX-A-A18 | 0.5 | no route | O2 heater 2 (HT2) | — | |
| W30 | OEM-D-20 | G4XMONSOONX-A-A27 | 0.5 | no route | O2 heater 1 (HT1) | — | |
| W31 | OEM-D-17 | G4XMONSOONX-A-A26 | 0.5 | no route | Cold start injector 1 (STJ1) | — | |
| W32 | OEM-A-17 | G4XMONSOONX-A-A22 | 0.5 | no route | O2 right front (OXR1) | — | |
| W33 | OEM-A-6 | G4XMONSOONX-A-A33 | 0.5 | no route | O2 left front (OXL1) | — | |
| W34 | OEM-B-11 | G4XMONSOONX-A-A14 | 0.5 | no route | O2 right rear (OXR2) | — | |
| W35 | OEM-A-16 | G4XMONSOONX-A-A16 | 0.5 | no route | Intake air temperature (THA) | — | |
| W36 | OEM-C-2 | G4XMONSOONX-A-A31 | 0.5 | no route | Igniter 1 feedback (IGF1) | — | |
| W37 | OEM-C-10 | G4XMONSOONX-A-A23 | 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 (6)
| 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. |
| warn | LOAD_UNKNOWN | G4XMONSOONX-A-A19 | G4XMONSOONX-A-A19 "Aux 3" drives OEM-B-7 A/C clutch relay (ACMG) (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | G4XMONSOONX-A-A20 | G4XMONSOONX-A-A20 "Aux 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 | G4XMONSOONX-A-A21 | G4XMONSOONX-A-A21 "Aux 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 | NET_FAMILY | OEM-C-6 ↔ G4XMONSOONX-A-A30 | OEM-C-6 "Cam sensor 2 + (G2+)" [trigger_in] is wired to G4XMONSOONX-A-A30 "Digital Input 1" [digital_in]. Hall-type cam/speed signals can use a digital input if it handles the frequency; VR signals cannot. |
| 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-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-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-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); OEM-D-8 ISC stepper coil 1 (ISC1) |
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
Fit check: unconfirmed. Confirm these before building: - Trigger pattern for Toyota 1UZ-FE not found in the ECU's docs (Link's trigger-mode list is only inside PCLink, not online) - Only 4 ignition outputs for 8 cylinders: wasted spark (pair coils per firing order) - Only 4 injector outputs for 8 injectors: batch / semi-sequential injection 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); Link G4X MonsoonX has no dedicated key-on input Not wired: - OEM-B 26: Battery constant (BATT): Link G4X MonsoonX has no battery-constant input; not needed - OEM-C 11: Knock sensor 2 (KNK2): no free knock input on Link G4X MonsoonX - OEM-A 8: Knock/shield (KS): no free knock input on Link G4X MonsoonX - OEM-D 8: ISC stepper coil 1 (ISC1): no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X MonsoonX - OEM-D 7: ISC stepper coil 2 (ISC2): no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X MonsoonX - OEM-D 6: ISC stepper coil 3 (ISC3): no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X MonsoonX - OEM-D 5: ISC stepper coil 4 (ISC4): no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X MonsoonX - OEM-B 5: Check-engine lamp (W): no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X MonsoonX - OEM-B 8: Fuel pump control (FC): no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X MonsoonX - OEM-D 21: EGR solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X MonsoonX - OEM-D 22: Fuel pressure-up VSV (PR): no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X MonsoonX - OEM-D 4: Cold start injector (STJ): no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X MonsoonX - OEM-B 24: O2 left rear (OXL2): no free o2_narrowband/analog_0_5 on Link G4X MonsoonX - OEM-A 7: EGR temperature sensor: no free thermistor/analog_0_5 on Link G4X MonsoonX - OEM-A 19: Vehicle speed (SPD): no free frequency_in/switch_in on Link G4X MonsoonX - OEM-A 9: Diagnostic test 1 (TE1): no free switch_in/frequency_in/analog_0_5 on Link G4X MonsoonX - OEM-A 20: Diagnostic test 2 (TE2): no free switch_in/frequency_in/analog_0_5 on Link G4X MonsoonX - OEM-A 14: Neutral start switch (NSW): no free switch_in/frequency_in/analog_0_5 on Link G4X MonsoonX - OEM-A 2: Starter signal (STA): no free switch_in/frequency_in/analog_0_5 on Link G4X MonsoonX - OEM-B 19: Stop light switch (BK): no free switch_in/frequency_in/analog_0_5 on Link G4X MonsoonX - OEM-B 20: A/T kickdown switch (KD): no free switch_in/frequency_in/analog_0_5 on Link G4X MonsoonX - OEM-B 23: A/C request (AC): no free switch_in/frequency_in/analog_0_5 on Link G4X MonsoonX - OEM-C 1: TPS idle switch (IDL): no free switch_in/frequency_in/analog_0_5 on Link G4X MonsoonX - OEM-C 4: Check connector VF1: no free analog_out on Link G4X MonsoonX - OEM-C 12: Check connector VF2: no free analog_out on Link G4X MonsoonX
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | Link: G4X MonsoonX quickstart + RET 115-1000 | https://linkecu.com/documentation/MonsoonXQuickstartGuide.pdf | archive | 2026-10-05 | e8d432b273d6 |
| 3 | community_copy | YourSpec: Link G4X MonsoonX flying-lead harness wiring list | https://wpm.yourspec.com/projects/view/1469 | — | — | — |
| 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/ | — | — | — |