Lexus IS300 (XE10 / JCE10) 2001-05 2JZ-GE VVT-i → Link G4X MonsoonX (auto)
Lexus IS300 (XE10 / JCE10) 2001-05 2JZ-GE VVT-i — 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 | 5: read the Findings page before cutting any wire |
| Size of the job | 41 wires · 10 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-E2-13 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-E3-16 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-E3-7 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-E3-8 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | SP-14V-1 | G4XMONSOONX-A-A5 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-E6-17 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-E7-21 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | G4XMONSOONX-A-A25 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | G4XMONSOONX-A-A34 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-E6-18 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-E6-19 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-E7-22 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | SP-0V-1 | G4XMONSOONX-A-A24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-E6-2 | G4XMONSOONX-A-A32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-E7-23 | G4XMONSOONX-A-A8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-E7-10 | G4XMONSOONX-A-A9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-E7-28 | G4XMONSOONX-A-A6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-E7-11 | G4XMONSOONX-A-A13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-E7-12 | G4XMONSOONX-A-A12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-E7-13 | G4XMONSOONX-A-A11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-E6-5 | G4XMONSOONX-A-A4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-E6-6 | G4XMONSOONX-A-A3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-E7-1 | G4XMONSOONX-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-E7-2 | G4XMONSOONX-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-E7-3 | G4XMONSOONX-A-A4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-E7-4 | G4XMONSOONX-A-A3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-E7-17 | G4XMONSOONX-A-A21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-E7-18 | G4XMONSOONX-A-A20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-E7-19 | G4XMONSOONX-A-A19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-E7-20 | G4XMONSOONX-A-A18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-E6-15 | G4XMONSOONX-A-A17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-E6-23 | G4XMONSOONX-A-A22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-E6-16 | G4XMONSOONX-A-A33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-E6-24 | G4XMONSOONX-A-A14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-E6-14 | G4XMONSOONX-A-A15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-E3-10 | G4XMONSOONX-A-A27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-E3-4 | G4XMONSOONX-A-A26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-E6-22 | G4XMONSOONX-A-A16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-E5-11 | G4XMONSOONX-A-A30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-E5-5 | G4XMONSOONX-A-A31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-E7-25 | 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-A5 | G4XMONSOONX-A-A24 | open (OL) | +12 V supply must not touch sensor ground | |
| 2 | G4XMONSOONX-A-A5 | G4XMONSOONX-A-A25 | open (OL) | +12 V supply must not touch power ground | |
| 3 | G4XMONSOONX-A-A24 | G4XMONSOONX-A-A32 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 4 | G4XMONSOONX-A-A25 | G4XMONSOONX-A-A32 | open (OL) | power ground must not touch 5 V sensor reference | |
| 5 | G4XMONSOONX-A-A5 | G4XMONSOONX-A-A32 | open (OL) | +12 V supply must not touch 5 V sensor reference |
If any reading doesn't match, stop and get help before powering up.
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
G4XMONSOONX-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A1 | Injector 4 | — | W24 | — | 0.5 | OEM-E7-2 | — | — | — |
| A10 | Ignition 4 | — | — | — | — | — | — | — | — |
| A11 | Ignition 3 | — | W20 | — | 0.5 | OEM-E7-13 | — | — | — |
| A12 | Ignition 2 | — | W19 | — | 0.5 | OEM-E7-12 | — | — | — |
| A13 | Ignition 1 | — | W18 | — | 0.5 | OEM-E7-11 | — | — | — |
| A14 | Analog Volt 4 | — | W34 | — | 0.5 | OEM-E6-24 | — | — | — |
| A15 | Analog Temp 1 | — | W35 | — | 0.5 | OEM-E6-14 | — | — | — |
| A16 | Analog Temp 2 | — | W38 | — | 0.5 | OEM-E6-22 | — | — | — |
| A17 | Analog Volt 1 | — | W31 | — | 0.5 | OEM-E6-15 | — | — | — |
| A18 | Aux 4 | — | W30 | — | 0.5 | OEM-E7-20 | — | — | — |
| A19 | Aux 3 | — | W29 | — | 0.5 | OEM-E7-19 | — | — | — |
| A2 | Injector 3 | — | W23 | — | 0.5 | OEM-E7-1 | — | — | — |
| A20 | Aux 2 | — | W28 | — | 0.5 | OEM-E7-18 | — | — | — |
| A21 | Aux 1 | — | W27 | — | 0.5 | OEM-E7-17 | — | — | — |
| A22 | Analog Volt 2 | — | W32 | — | 0.5 | OEM-E6-23 | — | — | — |
| A23 | Digital Input 3 | — | W41 | — | 0.5 | OEM-E7-25 | — | — | — |
| A24 | Sensor Ground | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| A25 | System Ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| A26 | Aux 6 | — | W37 | — | 0.5 | OEM-E3-4 | — | — | — |
| A27 | Aux 5 | — | W36 | — | 0.5 | OEM-E3-10 | — | — | — |
| A28 | CAN H | — | — | — | — | — | — | — | — |
| A29 | CAN L | — | — | — | — | — | — | — | — |
| A3 | Injector 2 | — | W22 | — | 0.5 | OEM-E6-6 | — | — | — |
| A3 | Injector 2 | — | W26 | — | 0.5 | OEM-E7-4 | — | — | — |
| A30 | Digital Input 1 | — | W39 | — | 0.5 | OEM-E5-11 | — | — | — |
| A31 | Digital Input 2 | — | W40 | — | 0.5 | OEM-E5-5 | — | — | — |
| A32 | +5V Out | — | W14 | — | 0.5 | OEM-E6-2 | — | — | — |
| A33 | Analog Volt 3 | — | W33 | — | 0.5 | OEM-E6-16 | — | — | — |
| A34 | System Ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| A4 | Injector 1 | — | W21 | — | 0.5 | OEM-E6-5 | — | — | — |
| A4 | Injector 1 | — | W25 | — | 0.5 | OEM-E7-3 | — | — | — |
| A5 | +14V ECU Power | — | W5 | — | 0.85 | SP-14V-1 | — | — | — |
| A6 | Knock 1 / Digital Input 4 | — | W17 | — | 0.5 | OEM-E7-28 | — | — | — |
| A7 | Shield Ground | — | — | — | — | — | — | — | — |
| A8 | Trigger 1 | — | W15 | — | 0.5 | OEM-E7-23 | — | — | — |
| A9 | Trigger 2 | — | W16 | — | 0.5 | OEM-E7-10 | — | — | — |
OEM-E2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 13 | ETCS power (TBP, throttle bypass) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 24 | O2 right rear (OXR2) | — | — | — | — | — | — | — | — |
| 25 | O2 heater right rear (HTR2) | — | — | — | — | — | — | — | — |
| 26 | O2 heater left rear (HTL2) | — | — | — | — | — | — | — | — |
OEM-E3
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Battery constant (BATT) | — | — | — | — | — | — | — | — |
| 10 | EFI main relay control (MREL) | — | W36 | — | 0.5 | G4XMONSOONX-A-A27 | — | — | — |
| 11 | Serial diagnostic (SIL) | — | — | — | — | — | — | — | — |
| 16 | EFI main relay (+B) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 4 | Fuel pump relay (FPR) | — | W37 | — | 0.5 | G4XMONSOONX-A-A26 | — | — | — |
| 5 | Fuel pump control (FC) | — | — | — | — | — | — | — | — |
| 6 | Check-engine lamp (W) | — | — | — | — | — | — | — | — |
| 7 | ETCS main relay (+BM) | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 8 | EFI main relay (+B2) | — | W4 | — | 0.85 | SP-14V-1 | — | — | — |
| 9 | Ignition switch (IGSW) | — | — | — | — | — | — | — | — |
OEM-E4
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 13 | A/C clutch relay (ACMG) | — | — | — | — | — | — | — | — |
| 18 | EVAP vapor pressure (PTNK) | — | — | — | — | — | — | — | — |
| 2 | Starter signal (STA) | — | — | — | — | — | — | — | — |
| 5 | Diagnostic/timing check (TC) | — | — | — | — | — | — | — | — |
| 6 | Stop light switch (STP) | — | — | — | — | — | — | — | — |
| 8 | O2 left rear (OXL2) | — | — | — | — | — | — | — | — |
OEM-E5
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 11 | Vehicle speed sensor (SP2-) | — | W39 | — | 0.5 | G4XMONSOONX-A-A30 | — | — | — |
| 12 | Canister close valve (CCV) | — | — | — | — | — | — | — | — |
| 5 | Vehicle speed sensor (SP2+) | — | W40 | — | 0.5 | G4XMONSOONX-A-A31 | — | — | — |
OEM-E6
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 10 | Mass air flow (VG) | — | — | — | — | — | — | — | — |
| 11 | O2 right front (OXR1) | — | — | — | — | — | — | — | — |
| 12 | O2 left front (OXL1) | — | — | — | — | — | — | — | — |
| 14 | Coolant temperature (THW) | — | W35 | — | 0.5 | G4XMONSOONX-A-A15 | — | — | — |
| 15 | Accelerator pedal 1 (VPA) | — | W31 | — | 0.5 | G4XMONSOONX-A-A17 | — | — | — |
| 16 | Accelerator pedal 2 (VPA2) | — | W33 | — | 0.5 | G4XMONSOONX-A-A33 | — | — | — |
| 17 | Power ground (E1) | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 18 | Sensor ground (E2) | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | MAF ground (EVG) | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 2 | Sensor supply +5V (VC) | — | W14 | — | 0.5 | G4XMONSOONX-A-A32 | — | — | — |
| 22 | Intake air temperature (THA) | — | W38 | — | 0.5 | G4XMONSOONX-A-A16 | — | — | — |
| 23 | Throttle position 1 (VTA) | — | W32 | — | 0.5 | G4XMONSOONX-A-A22 | — | — | — |
| 24 | Throttle position 2 (VTA2) | — | W34 | — | 0.5 | G4XMONSOONX-A-A14 | — | — | — |
| 3 | O2 heater right front (HTR) | — | — | — | — | — | — | — | — |
| 4 | O2 heater left front (HTL) | — | — | — | — | — | — | — | — |
| 5 | Injector 1 (#10) | — | W21 | — | 0.5 | G4XMONSOONX-A-A4 | — | — | — |
| 6 | Injector 2 (#20) | — | W22 | — | 0.5 | G4XMONSOONX-A-A3 | — | — | — |
| 7 | EVAP purge VSV (PRG) | — | — | — | — | — | — | — | — |
OEM-E7
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injector 3 (#30) | — | W23 | — | 0.5 | G4XMONSOONX-A-A2 | — | — | — |
| 10 | Cam position (G2) | — | W16 | — | 0.5 | G4XMONSOONX-A-A9 | — | — | — |
| 11 | Ignition 1 (IGT) | — | W18 | — | 0.5 | G4XMONSOONX-A-A13 | — | — | — |
| 12 | Ignition 2 (IGT2) | — | W19 | — | 0.5 | G4XMONSOONX-A-A12 | — | — | — |
| 13 | Ignition 3 (IGT3) | — | W20 | — | 0.5 | G4XMONSOONX-A-A11 | — | — | — |
| 17 | VVT-i OCV - (OCV-) | — | W27 | — | 0.5 | G4XMONSOONX-A-A21 | — | — | — |
| 18 | VVT-i OCV + (OCV+) | — | W28 | — | 0.5 | G4XMONSOONX-A-A20 | — | — | — |
| 19 | ETCS throttle clutch - (CL-) | — | W29 | — | 0.5 | G4XMONSOONX-A-A19 | — | — | — |
| 2 | Injector 4 (#40) | — | W24 | — | 0.5 | G4XMONSOONX-A-A1 | — | — | — |
| 20 | ETCS throttle clutch + (CL+) | — | W30 | — | 0.5 | G4XMONSOONX-A-A18 | — | — | — |
| 21 | Power ground (E01) | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 22 | Crank position return (NE-) | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 23 | Crank position (NE) | — | W15 | — | 0.5 | G4XMONSOONX-A-A8 | — | — | — |
| 25 | Igniter feedback (IGF) | — | W41 | — | 0.5 | G4XMONSOONX-A-A23 | — | — | — |
| 27 | Knock sensor 2 (KNK2) | — | — | — | — | — | — | — | — |
| 28 | Knock sensor 1 (KNK1) | — | W17 | — | 0.5 | G4XMONSOONX-A-A6 | — | — | — |
| 3 | Injector 5 (#50) | — | W25 | — | 0.5 | G4XMONSOONX-A-A4 | — | — | — |
| 4 | Injector 6 (#60) | — | W26 | — | 0.5 | G4XMONSOONX-A-A3 | — | — | — |
| 5 | ACIS intake VSV | — | — | — | — | — | — | — | — |
| 7 | ETCS throttle motor - (M-) | — | — | — | — | — | — | — | — |
| 8 | ETCS throttle motor + (M+) | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W10 | — | 0.5 | OEM-E6-18 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-E6-19 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-E7-22 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | G4XMONSOONX-A-A24 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-E2-13 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-E3-16 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | OEM-E3-7 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | OEM-E3-8 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | G4XMONSOONX-A-A5 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W6 | — | 0.85 | OEM-E6-17 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-E7-21 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | G4XMONSOONX-A-A25 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | G4XMONSOONX-A-A34 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-E2-13 | ETCS power (TBP, throttle bypass) | power_in | G4XMONSOONX-A-A5 | +14V ECU Power | power_in | single_source | |
| OEM-E2-24 | O2 right rear (OXR2) | lambda_nb_in | — | — | — | single_source | |
| OEM-E2-25 | O2 heater right rear (HTR2) | low_side_out | — | — | — | single_source | |
| OEM-E2-26 | O2 heater left rear (HTL2) | low_side_out | — | — | — | single_source | |
| OEM-E3-1 | Battery constant (BATT) | power_in | — | — | — | single_source | |
| OEM-E3-10 | EFI main relay control (MREL) | low_side_out | G4XMONSOONX-A-A27 | Aux 5 | low_side_out | single_source | |
| OEM-E3-11 | Serial diagnostic (SIL) | serial | — | — | — | single_source | |
| OEM-E3-16 | EFI main relay (+B) | power_in | G4XMONSOONX-A-A5 | +14V ECU Power | power_in | single_source | |
| OEM-E3-4 | Fuel pump relay (FPR) | low_side_out | G4XMONSOONX-A-A26 | Aux 6 | low_side_out | single_source | |
| OEM-E3-5 | Fuel pump control (FC) | low_side_out | — | — | — | single_source | |
| OEM-E3-6 | Check-engine lamp (W) | low_side_out | — | — | — | single_source | |
| OEM-E3-7 | ETCS main relay (+BM) | power_in | G4XMONSOONX-A-A5 | +14V ECU Power | power_in | single_source | |
| OEM-E3-8 | EFI main relay (+B2) | power_in | G4XMONSOONX-A-A5 | +14V ECU Power | power_in | single_source | |
| OEM-E3-9 | Ignition switch (IGSW) | digital_in | — | — | — | single_source | |
| OEM-E4-13 | A/C clutch relay (ACMG) | low_side_out | — | — | — | single_source | |
| OEM-E4-18 | EVAP vapor pressure (PTNK) | analog_in | — | — | — | single_source | |
| OEM-E4-2 | Starter signal (STA) | digital_in | — | — | — | single_source | |
| OEM-E4-5 | Diagnostic/timing check (TC) | digital_in | — | — | — | single_source | |
| OEM-E4-6 | Stop light switch (STP) | digital_in | — | — | — | single_source | |
| OEM-E4-8 | O2 left rear (OXL2) | lambda_nb_in | — | — | — | single_source | |
| OEM-E5-11 | Vehicle speed sensor (SP2-) | digital_in | G4XMONSOONX-A-A30 | Digital Input 1 | digital_in | single_source | |
| OEM-E5-12 | Canister close valve (CCV) | low_side_out | — | — | — | single_source | |
| OEM-E5-5 | Vehicle speed sensor (SP2+) | digital_in | G4XMONSOONX-A-A31 | Digital Input 2 | digital_in | single_source | |
| OEM-E6-10 | Mass air flow (VG) | analog_in | — | — | — | single_source | |
| OEM-E6-11 | O2 right front (OXR1) | lambda_nb_in | — | — | — | single_source | |
| OEM-E6-12 | O2 left front (OXL1) | lambda_nb_in | — | — | — | single_source | |
| OEM-E6-14 | Coolant temperature (THW) | temp_in | G4XMONSOONX-A-A15 | Analog Temp 1 | temp_in | single_source | |
| OEM-E6-15 | Accelerator pedal 1 (VPA) | analog_in | G4XMONSOONX-A-A17 | Analog Volt 1 | analog_in | single_source | |
| OEM-E6-16 | Accelerator pedal 2 (VPA2) | analog_in | G4XMONSOONX-A-A33 | Analog Volt 3 | analog_in | single_source | |
| OEM-E6-17 | Power ground (E1) | ground | G4XMONSOONX-A-A25 + G4XMONSOONX-A-A34 | System Ground + System Ground | ground | single_source | |
| OEM-E6-18 | Sensor ground (E2) | sensor_ground | G4XMONSOONX-A-A24 | Sensor Ground | sensor_ground | single_source | |
| OEM-E6-19 | MAF ground (EVG) | sensor_ground | G4XMONSOONX-A-A24 | Sensor Ground | sensor_ground | single_source | |
| OEM-E6-2 | Sensor supply +5V (VC) | vref | G4XMONSOONX-A-A32 | +5V Out | vref | single_source | |
| OEM-E6-22 | Intake air temperature (THA) | temp_in | G4XMONSOONX-A-A16 | Analog Temp 2 | temp_in | single_source | |
| OEM-E6-23 | Throttle position 1 (VTA) | analog_in | G4XMONSOONX-A-A22 | Analog Volt 2 | analog_in | single_source | |
| OEM-E6-24 | Throttle position 2 (VTA2) | analog_in | G4XMONSOONX-A-A14 | Analog Volt 4 | analog_in | single_source | |
| OEM-E6-3 | O2 heater right front (HTR) | low_side_out | — | — | — | single_source | |
| OEM-E6-4 | O2 heater left front (HTL) | low_side_out | — | — | — | single_source | |
| OEM-E6-5 | Injector 1 (#10) | injector_out | G4XMONSOONX-A-A4 | Injector 1 | injector_out | single_source | |
| OEM-E6-6 | Injector 2 (#20) | injector_out | G4XMONSOONX-A-A3 | Injector 2 | injector_out | single_source | |
| OEM-E6-7 | EVAP purge VSV (PRG) | low_side_out | — | — | — | single_source | |
| OEM-E7-1 | Injector 3 (#30) | injector_out | G4XMONSOONX-A-A2 | Injector 3 | injector_out | single_source | |
| OEM-E7-10 | Cam position (G2) | trigger_in | G4XMONSOONX-A-A9 | Trigger 2 | trigger_in | single_source | |
| OEM-E7-11 | Ignition 1 (IGT) | ignition_out | G4XMONSOONX-A-A13 | Ignition 1 | ignition_out | single_source | |
| OEM-E7-12 | Ignition 2 (IGT2) | ignition_out | G4XMONSOONX-A-A12 | Ignition 2 | ignition_out | single_source | |
| OEM-E7-13 | Ignition 3 (IGT3) | ignition_out | G4XMONSOONX-A-A11 | Ignition 3 | ignition_out | single_source | |
| OEM-E7-17 | VVT-i OCV - (OCV-) | low_side_out | G4XMONSOONX-A-A21 | Aux 1 | low_side_out | single_source | |
| OEM-E7-18 | VVT-i OCV + (OCV+) | low_side_out | G4XMONSOONX-A-A20 | Aux 2 | low_side_out | single_source | |
| OEM-E7-19 | ETCS throttle clutch - (CL-) | low_side_out | G4XMONSOONX-A-A19 | Aux 3 | low_side_out | single_source | |
| OEM-E7-2 | Injector 4 (#40) | injector_out | G4XMONSOONX-A-A1 | Injector 4 | injector_out | single_source | |
| OEM-E7-20 | ETCS throttle clutch + (CL+) | low_side_out | G4XMONSOONX-A-A18 | Aux 4 | low_side_out | single_source | |
| OEM-E7-21 | Power ground (E01) | ground | G4XMONSOONX-A-A25 + G4XMONSOONX-A-A34 | System Ground + System Ground | ground | single_source | |
| OEM-E7-22 | Crank position return (NE-) | sensor_ground | G4XMONSOONX-A-A24 | Sensor Ground | sensor_ground | single_source | |
| OEM-E7-23 | Crank position (NE) | trigger_in | G4XMONSOONX-A-A8 | Trigger 1 | trigger_in | single_source | |
| OEM-E7-25 | Igniter feedback (IGF) | digital_in | G4XMONSOONX-A-A23 | Digital Input 3 | digital_in | single_source | |
| OEM-E7-27 | Knock sensor 2 (KNK2) | knock_in | — | — | — | single_source | |
| OEM-E7-28 | Knock sensor 1 (KNK1) | knock_in | G4XMONSOONX-A-A6 | Knock 1 / Digital Input 4 | knock_in | single_source | |
| OEM-E7-3 | Injector 5 (#50) | injector_out | G4XMONSOONX-A-A4 | Injector 1 | injector_out | single_source | |
| OEM-E7-4 | Injector 6 (#60) | injector_out | G4XMONSOONX-A-A3 | Injector 2 | injector_out | single_source | |
| OEM-E7-5 | ACIS intake VSV | low_side_out | — | — | — | single_source | |
| OEM-E7-7 | ETCS throttle motor - (M-) | hbridge_out | — | — | — | single_source | |
| OEM-E7-8 | ETCS throttle motor + (M+) | hbridge_out | — | — | — | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-E2-13 | SP-14V-1 | 0.85 | no route | ETCS power (TBP, throttle bypass) | — | |
| W2 | OEM-E3-16 | SP-14V-1 | 0.85 | no route | EFI main relay (+B) | — | |
| W3 | OEM-E3-7 | SP-14V-1 | 0.85 | no route | ETCS main relay (+BM) | — | |
| W4 | OEM-E3-8 | SP-14V-1 | 0.85 | no route | EFI main relay (+B2) | — | |
| W5 | SP-14V-1 | G4XMONSOONX-A-A5 | 0.85 | no route | +14V ECU Power | — | |
| W6 | OEM-E6-17 | SP-GND-1 | 0.85 | no route | Power ground (E1) | — | |
| W7 | OEM-E7-21 | SP-GND-1 | 0.85 | no route | Power ground (E01) | — | |
| W8 | SP-GND-1 | G4XMONSOONX-A-A25 | 0.85 | no route | System Ground | — | |
| W9 | SP-GND-1 | G4XMONSOONX-A-A34 | 0.85 | no route | System Ground | — | |
| W10 | OEM-E6-18 | SP-0V-1 | 0.5 | no route | Sensor ground (E2) | — | |
| W11 | OEM-E6-19 | SP-0V-1 | 0.5 | no route | MAF ground (EVG) | — | |
| W12 | OEM-E7-22 | SP-0V-1 | 0.5 | no route | Crank position return (NE-) | — | |
| W13 | SP-0V-1 | G4XMONSOONX-A-A24 | 0.5 | no route | Sensor Ground | — | |
| W14 | OEM-E6-2 | G4XMONSOONX-A-A32 | 0.5 | no route | Sensor supply +5V (VC) | — | |
| W15 | OEM-E7-23 | G4XMONSOONX-A-A8 | 0.5 | no route | Crank position (NE) | — | |
| W16 | OEM-E7-10 | G4XMONSOONX-A-A9 | 0.5 | no route | Cam position (G2) | — | |
| W17 | OEM-E7-28 | G4XMONSOONX-A-A6 | 0.5 | no route | Knock sensor 1 (KNK1) | — | |
| W18 | OEM-E7-11 | G4XMONSOONX-A-A13 | 0.5 | no route | Ignition 1 (IGT) | — | |
| W19 | OEM-E7-12 | G4XMONSOONX-A-A12 | 0.5 | no route | Ignition 2 (IGT2) | — | |
| W20 | OEM-E7-13 | G4XMONSOONX-A-A11 | 0.5 | no route | Ignition 3 (IGT3) | — | |
| W21 | OEM-E6-5 | G4XMONSOONX-A-A4 | 0.5 | no route | Injector 1 (#10) | — | |
| W22 | OEM-E6-6 | G4XMONSOONX-A-A3 | 0.5 | no route | Injector 2 (#20) | — | |
| W23 | OEM-E7-1 | G4XMONSOONX-A-A2 | 0.5 | no route | Injector 3 (#30) | — | |
| W24 | OEM-E7-2 | G4XMONSOONX-A-A1 | 0.5 | no route | Injector 4 (#40) | — | |
| W25 | OEM-E7-3 | G4XMONSOONX-A-A4 | 0.5 | no route | Injector 5 (#50) | — | |
| W26 | OEM-E7-4 | G4XMONSOONX-A-A3 | 0.5 | no route | Injector 6 (#60) | — | |
| W27 | OEM-E7-17 | G4XMONSOONX-A-A21 | 0.5 | no route | VVT-i OCV - (OCV-) | — | |
| W28 | OEM-E7-18 | G4XMONSOONX-A-A20 | 0.5 | no route | VVT-i OCV + (OCV+) | — | |
| W29 | OEM-E7-19 | G4XMONSOONX-A-A19 | 0.5 | no route | ETCS throttle clutch - (CL-) | — | |
| W30 | OEM-E7-20 | G4XMONSOONX-A-A18 | 0.5 | no route | ETCS throttle clutch + (CL+) | — | |
| W31 | OEM-E6-15 | G4XMONSOONX-A-A17 | 0.5 | no route | Accelerator pedal 1 (VPA) | — | |
| W32 | OEM-E6-23 | G4XMONSOONX-A-A22 | 0.5 | no route | Throttle position 1 (VTA) | — | |
| W33 | OEM-E6-16 | G4XMONSOONX-A-A33 | 0.5 | no route | Accelerator pedal 2 (VPA2) | — | |
| W34 | OEM-E6-24 | G4XMONSOONX-A-A14 | 0.5 | no route | Throttle position 2 (VTA2) | — | |
| W35 | OEM-E6-14 | G4XMONSOONX-A-A15 | 0.5 | no route | Coolant temperature (THW) | — | |
| W36 | OEM-E3-10 | G4XMONSOONX-A-A27 | 0.5 | no route | EFI main relay control (MREL) | — | |
| W37 | OEM-E3-4 | G4XMONSOONX-A-A26 | 0.5 | no route | Fuel pump relay (FPR) | — | |
| W38 | OEM-E6-22 | G4XMONSOONX-A-A16 | 0.5 | no route | Intake air temperature (THA) | — | |
| W39 | OEM-E5-11 | G4XMONSOONX-A-A30 | 0.5 | no route | Vehicle speed sensor (SP2-) | — | |
| W40 | OEM-E5-5 | G4XMONSOONX-A-A31 | 0.5 | no route | Vehicle speed sensor (SP2+) | — | |
| W41 | OEM-E7-25 | G4XMONSOONX-A-A23 | 0.5 | no route | Igniter feedback (IGF) | — |
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 | NET_MERGED | G4XMONSOONX-A-A3 + OEM-E6-6 + OEM-E7-4 | 2 different OEM functions share one net: OEM-E6-6 Injector 2 (#20); OEM-E7-4 Injector 6 (#60) |
| error | NET_MERGED | G4XMONSOONX-A-A4 + OEM-E6-5 + OEM-E7-3 | 2 different OEM functions share one net: OEM-E6-5 Injector 1 (#10); OEM-E7-3 Injector 5 (#50) |
| error | REQUIRED_UNMAPPED | OEM-E3-9 | Required OEM function "Ignition switch (IGSW)" (digital_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E7-7 | Required OEM function "ETCS throttle motor - (M-)" (hbridge_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E7-8 | Required OEM function "ETCS throttle motor + (M+)" (hbridge_out) is not connected to the new ECU. |
| warn | LOAD_UNKNOWN | G4XMONSOONX-A-A26 | G4XMONSOONX-A-A26 "Aux 6" drives OEM-E3-4 Fuel pump relay (FPR) (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | G4XMONSOONX-A-A27 | G4XMONSOONX-A-A27 "Aux 5" drives OEM-E3-10 EFI main relay control (MREL) (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| info | UNMAPPED | OEM | 21 optional OEM pins are not mapped: OEM-E2-24 O2 right rear (OXR2); OEM-E2-25 O2 heater right rear (HTR2); OEM-E2-26 O2 heater left rear (HTL2); OEM-E3-11 Serial diagnostic (SIL); OEM-E3-5 Fuel pump control (FC); OEM-E3-6 Check-engine lamp (W); OEM-E4-13 A/C clutch relay (ACMG); OEM-E4-18 EVAP vapor pressure (PTNK); OEM-E4-2 Starter signal (STA); OEM-E4-5 Diagnostic/timing check (TC); OEM-E4-6 Stop light switch (STP); OEM-E4-8 O2 left rear (OXL2); OEM-E5-12 Canister close valve (CCV); OEM-E6-10 Mass air flow (VG); OEM-E6-11 O2 right front (OXR1); OEM-E6-12 O2 left front (OXL1); OEM-E6-3 O2 heater right front (HTR); OEM-E6-4 O2 heater left front (HTL); OEM-E6-7 EVAP purge VSV (PRG); OEM-E7-27 Knock sensor 2 (KNK2); OEM-E7-5 ACIS intake VSV |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-E3-1 | Battery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed. | mapping-proposal |
Notes
Fit check: needs add-on. Resolve these before building: - Drive-by-wire only with an add-on: Link RET 115-1000 - Only 4 ignition outputs for 6 cylinders: wasted spark (pair coils per firing order) - Only 4 injector outputs for 6 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-E3 9: 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 - OEM-E7 7: ETCS throttle motor - (M-): no +/− pair in the pinout (multi-phase or half-documented motor); wire by hand - OEM-E7 8: ETCS throttle motor + (M+): no +/− pair in the pinout (multi-phase or half-documented motor); wire by hand Not wired: - OEM-E3 1: Battery constant (BATT): Link G4X MonsoonX has no battery-constant input; not needed - OEM-E7 27: Knock sensor 2 (KNK2): no free knock input on Link G4X MonsoonX - OEM-E4 13: A/C clutch relay (ACMG): no free relay_control/low_side/heater_low_side/ls_hs/injector rated ≥ 0.2 A on Link G4X MonsoonX - OEM-E2 25: O2 heater right rear (HTR2): no free heater_low_side/low_side/relay_control/ls_hs/injector on Link G4X MonsoonX - OEM-E2 26: O2 heater left rear (HTL2): no free heater_low_side/low_side/relay_control/ls_hs/injector on Link G4X MonsoonX - OEM-E6 3: O2 heater right front (HTR): no free heater_low_side/low_side/relay_control/ls_hs/injector on Link G4X MonsoonX - OEM-E6 4: O2 heater left front (HTL): no free heater_low_side/low_side/relay_control/ls_hs/injector on Link G4X MonsoonX - OEM-E3 5: Fuel pump control (FC): no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X MonsoonX - OEM-E3 6: Check-engine lamp (W): no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X MonsoonX - OEM-E5 12: Canister close valve (CCV): no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X MonsoonX - OEM-E6 7: EVAP purge VSV (PRG): no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X MonsoonX - OEM-E7 5: ACIS intake VSV: no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X MonsoonX - OEM-E6 10: Mass air flow (VG): no free maf/analog_0_5 on Link G4X MonsoonX - OEM-E2 24: O2 right rear (OXR2): no free o2_narrowband/analog_0_5 on Link G4X MonsoonX - OEM-E4 8: O2 left rear (OXL2): no free o2_narrowband/analog_0_5 on Link G4X MonsoonX - OEM-E6 11: O2 right front (OXR1): no free o2_narrowband/analog_0_5 on Link G4X MonsoonX - OEM-E6 12: O2 left front (OXL1): no free o2_narrowband/analog_0_5 on Link G4X MonsoonX - OEM-E4 18: EVAP vapor pressure (PTNK): no free analog_0_5 on Link G4X MonsoonX - OEM-E4 2: Starter signal (STA): no free switch_in/frequency_in/analog_0_5 on Link G4X MonsoonX - OEM-E4 5: Diagnostic/timing check (TC): no free switch_in/frequency_in/analog_0_5 on Link G4X MonsoonX - OEM-E4 6: Stop light switch (STP): no free switch_in/frequency_in/analog_0_5 on Link G4X MonsoonX - OEM-E3 11: Serial diagnostic (SIL): no free k_line 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 |
| 4 | service_manual | Toyota FSM RM779U (2001 Lexus IS300) — DIAGNOSTICS 'TERMINALS OF ECM' (DI-20/21) | http://www.2jzgarage.com/wp-content/uploads/2013/04/2001_IS300_ECU_Pinouts.pdf | — | — | — |
| 3 | community_copy | YourSpec: Link G4X MonsoonX flying-lead harness wiring list | https://wpm.yourspec.com/projects/view/1469 | — | — | — |