Lexus LS400 1989-97 (1UZ-FE non-VVTi) → Haltech Nexus S3 HT-213000 (auto)
Lexus LS400 1989-97 (1UZ-FE non-VVTi) — Haltech — Nexus S3
Drawn by Michael Gnankou · Rev 0 · proposal · 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 | proposal · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | none |
| Size of the job | 56 wires · 9 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 | NEXUSS3-A-18 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | SP-14V-1 | NEXUSS3-A-25 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-A-22 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-D-13 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-D-26 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | NEXUSS3-A-10 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | NEXUSS3-A-11 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-A-18 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-C-15 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-C-16 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | SP-0V-1 | NEXUSS3-C-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-A-11 | NEXUSS3-C-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-C-8 | NEXUSS3-C-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-0V-1 | NEXUSS3-C-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-C-7 | NEXUSS3-C-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | SP-0V-1 | NEXUSS3-C-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-C-6 | NEXUSS3-C-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-C-3 | NEXUSS3-C-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-C-11 | NEXUSS3-C-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-C-5 | NEXUSS3-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-C-13 | NEXUSS3-A-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-D-12 | NEXUSS3-A-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-D-11 | NEXUSS3-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-D-24 | NEXUSS3-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-D-25 | NEXUSS3-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-A-1 | NEXUSS3-A-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-A-4 | NEXUSS3-C-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-A-5 | NEXUSS3-C-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-B-4 | NEXUSS3-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-B-6 | NEXUSS3-A-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-B-7 | NEXUSS3-A-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-D-19 | NEXUSS3-C-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-D-20 | NEXUSS3-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-D-17 | NEXUSS3-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-D-8 | NEXUSS3-A-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-D-7 | NEXUSS3-A-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-D-6 | NEXUSS3-A-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-D-5 | NEXUSS3-A-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-B-5 | NEXUSS3-A-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-B-8 | NEXUSS3-A-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-A-17 | NEXUSS3-C-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-A-6 | NEXUSS3-C-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-B-11 | NEXUSS3-C-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-B-24 | NEXUSS3-C-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-A-16 | NEXUSS3-C-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-A-7 | NEXUSS3-C-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-C-2 | NEXUSS3-C-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | OEM-C-10 | NEXUSS3-C-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W51 | OEM-A-19 | NEXUSS3-C-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W52 | OEM-A-9 | NEXUSS3-C-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W53 | OEM-A-20 | NEXUSS3-C-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W54 | OEM-A-14 | NEXUSS3-C-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W55 | OEM-A-2 | NEXUSS3-C-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W56 | OEM-B-19 | NEXUSS3-C-28 | 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 | NEXUSS3-A-18 | NEXUSS3-A-10 | open (OL) | +12 V supply must not touch power ground | |
| 2 | NEXUSS3-A-18 | NEXUSS3-C-2 | open (OL) | +12 V supply must not touch sensor ground | |
| 3 | NEXUSS3-C-25 | NEXUSS3-A-10 | open (OL) | 5 V sensor reference must not touch power ground | |
| 4 | NEXUSS3-C-25 | NEXUSS3-C-2 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 5 | NEXUSS3-C-25 | NEXUSS3-A-18 | 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
NEXUSS3-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injector 1 | — | W24 | — | 0.5 | OEM-D-12 | — | — | — |
| 10 | Battery ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 11 | Battery ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 12 | DPO 2 | — | W33 | — | 0.5 | OEM-B-7 | — | — | — |
| 13 | Ignition switch input | — | W28 | — | 0.5 | OEM-A-1 | — | — | — |
| 14 | DPO 3 | — | W35 | — | 0.5 | OEM-D-20 | — | — | — |
| 15 | DPO 4 | — | W36 | — | 0.5 | OEM-D-17 | — | — | — |
| 16 | DPO 5 | — | W37 | — | 0.5 | OEM-D-8 | — | — | — |
| 17 | DPO 6 | — | W38 | — | 0.5 | OEM-D-7 | — | — | — |
| 18 | +12V switched input | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 19 | HBO 1 | — | — | — | — | — | — | — | — |
| 2 | Injector 2 | — | W25 | — | 0.5 | OEM-D-11 | — | — | — |
| 20 | HBO 2 | — | — | — | — | — | — | — | — |
| 21 | HBO 3 | — | — | — | — | — | — | — | — |
| 22 | HBO 4 | — | — | — | — | — | — | — | — |
| 23 | CAN 1 High | — | — | — | — | — | — | — | — |
| 24 | CAN 1 Low | — | — | — | — | — | — | — | — |
| 25 | +12V switched input | — | W4 | — | 0.85 | SP-14V-1 | — | — | — |
| 26 | ECR output | — | W31 | — | 0.5 | OEM-B-4 | — | — | — |
| 27 | Ignition 1 | — | W22 | — | 0.5 | OEM-C-5 | — | — | — |
| 28 | Ignition 2 | — | W23 | — | 0.5 | OEM-C-13 | — | — | — |
| 29 | Ignition 3 | — | — | — | — | — | — | — | — |
| 3 | Injector 3 | — | W26 | — | 0.5 | OEM-D-24 | — | — | — |
| 30 | Ignition 4 | — | — | — | — | — | — | — | — |
| 31 | Ignition 5 | — | — | — | — | — | — | — | — |
| 32 | Ignition 6 | — | — | — | — | — | — | — | — |
| 33 | Ignition 7 | — | — | — | — | — | — | — | — |
| 34 | Ignition 8 | — | — | — | — | — | — | — | — |
| 4 | Injector 4 | — | W27 | — | 0.5 | OEM-D-25 | — | — | — |
| 5 | Injector 5 | — | W39 | — | 0.5 | OEM-D-6 | — | — | — |
| 6 | Injector 6 | — | W40 | — | 0.5 | OEM-D-5 | — | — | — |
| 7 | Injector 7 | — | W41 | — | 0.5 | OEM-B-5 | — | — | — |
| 8 | Injector 8 | — | W42 | — | 0.5 | OEM-B-8 | — | — | — |
| 9 | DPO 1 | — | W32 | — | 0.5 | OEM-B-6 | — | — | — |
NEXUSS3-C
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Trigger + | — | W15 | — | 0.5 | OEM-C-8 | — | — | — |
| 10 | AVI 1 | — | W29 | — | 0.5 | OEM-A-4 | — | — | — |
| 11 | AVI 2 | — | W30 | — | 0.5 | OEM-A-5 | — | — | — |
| 12 | AVI 3 | — | W43 | — | 0.5 | OEM-A-17 | — | — | — |
| 13 | AVI 4 | — | W44 | — | 0.5 | OEM-A-6 | — | — | — |
| 14 | AVI 5 | — | W45 | — | 0.5 | OEM-B-11 | — | — | — |
| 15 | AVI 6 | — | W46 | — | 0.5 | OEM-B-24 | — | — | — |
| 16 | AVI 7 | — | W47 | — | 0.5 | OEM-A-16 | — | — | — |
| 17 | AVI 8 | — | W48 | — | 0.5 | OEM-A-7 | — | — | — |
| 18 | AVI 9 | — | W54 | — | 0.5 | OEM-A-14 | — | — | — |
| 19 | SPI 5 | — | W52 | — | 0.5 | OEM-A-9 | — | — | — |
| 2 | Trigger - | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 20 | SPI 6 | — | W53 | — | 0.5 | OEM-A-20 | — | — | — |
| 21 | CAN 2 High | — | — | — | — | — | — | — | — |
| 22 | CAN 2 Low | — | — | — | — | — | — | — | — |
| 23 | Knock 1 | — | W20 | — | 0.5 | OEM-C-3 | — | — | — |
| 24 | Knock 2 | — | W21 | — | 0.5 | OEM-C-11 | — | — | — |
| 25 | +5V | — | W14 | — | 0.5 | OEM-A-11 | — | — | — |
| 26 | Signal ground | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 27 | AVI 10 | — | W55 | — | 0.5 | OEM-A-2 | — | — | — |
| 28 | AVI 11 | — | W56 | — | 0.5 | OEM-B-19 | — | — | — |
| 29 | WBI 1 Heater + | — | — | — | — | — | — | — | — |
| 3 | Home + | — | W17 | — | 0.5 | OEM-C-7 | — | — | — |
| 30 | WBI 1 Input | — | — | — | — | — | — | — | — |
| 31 | WBI 1 Pump | — | — | — | — | — | — | — | — |
| 32 | WBI 1 Nernst | — | — | — | — | — | — | — | — |
| 33 | WBI 1 Heater - | — | W34 | — | 0.5 | OEM-D-19 | — | — | — |
| 34 | WBI 1 Cal | — | — | — | — | — | — | — | — |
| 4 | Home - | — | W18 | — | 0.5 | SP-0V-1 | — | — | — |
| 5 | SPI 1 | — | W19 | — | 0.5 | OEM-C-6 | — | — | — |
| 6 | SPI 2 | — | W49 | — | 0.5 | OEM-C-2 | — | — | — |
| 7 | SPI 3 | — | W50 | — | 0.5 | OEM-C-10 | — | — | — |
| 8 | SPI 4 | — | W51 | — | 0.5 | OEM-A-19 | — | — | — |
| 9 | +8V | — | — | — | — | — | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ignition switch (IGSW) | — | W28 | — | 0.5 | NEXUSS3-A-13 | — | — | — |
| 11 | Sensor supply +5V (VC) | — | W14 | — | 0.5 | NEXUSS3-C-25 | — | — | — |
| 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) | — | W54 | — | 0.5 | NEXUSS3-C-18 | — | — | — |
| 16 | Intake air temperature (THA) | — | W47 | — | 0.5 | NEXUSS3-C-16 | — | — | — |
| 17 | O2 right front (OXR1) | — | W43 | — | 0.5 | NEXUSS3-C-12 | — | — | — |
| 18 | Sensor ground (E2) | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | Vehicle speed (SPD) | — | W51 | — | 0.5 | NEXUSS3-C-8 | — | — | — |
| 2 | Starter signal (STA) | — | W55 | — | 0.5 | NEXUSS3-C-27 | — | — | — |
| 20 | Diagnostic test 2 (TE2) | — | W53 | — | 0.5 | NEXUSS3-C-20 | — | — | — |
| 22 | Power ground (E1) | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 4 | Throttle position (VTA1) | — | W29 | — | 0.5 | NEXUSS3-C-10 | — | — | — |
| 5 | Coolant temperature (THW) | — | W30 | — | 0.5 | NEXUSS3-C-11 | — | — | — |
| 6 | O2 left front (OXL1) | — | W44 | — | 0.5 | NEXUSS3-C-13 | — | — | — |
| 7 | EGR temperature sensor | — | W48 | — | 0.5 | NEXUSS3-C-17 | — | — | — |
| 8 | Knock/shield (KS) | — | — | — | — | — | — | — | — |
| 9 | Diagnostic test 1 (TE1) | — | W52 | — | 0.5 | NEXUSS3-C-19 | — | — | — |
OEM-B
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 11 | O2 right rear (OXR2) | — | W45 | — | 0.5 | NEXUSS3-C-14 | — | — | — |
| 19 | Stop light switch (BK) | — | W56 | — | 0.5 | NEXUSS3-C-28 | — | — | — |
| 20 | A/T kickdown switch (KD) | — | — | — | — | — | — | — | — |
| 23 | A/C request (AC) | — | — | — | — | — | — | — | — |
| 24 | O2 left rear (OXL2) | — | W46 | — | 0.5 | NEXUSS3-C-15 | — | — | — |
| 26 | Battery constant (BATT) | — | — | — | — | — | — | — | — |
| 4 | EFI main relay control (MREL) | — | W31 | — | 0.5 | NEXUSS3-A-26 | — | — | — |
| 5 | Check-engine lamp (W) | — | W41 | — | 0.5 | NEXUSS3-A-7 | — | — | — |
| 6 | Fuel pump relay (FPR) | — | W32 | — | 0.5 | NEXUSS3-A-9 | — | — | — |
| 7 | A/C clutch relay (ACMG) | — | W33 | — | 0.5 | NEXUSS3-A-12 | — | — | — |
| 8 | Fuel pump control (FC) | — | W42 | — | 0.5 | NEXUSS3-A-8 | — | — | — |
OEM-C
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | TPS idle switch (IDL) | — | — | — | — | — | — | — | — |
| 10 | Igniter 2 feedback (IGF2) | — | W50 | — | 0.5 | NEXUSS3-C-7 | — | — | — |
| 11 | Knock sensor 2 (KNK2) | — | W21 | — | 0.5 | NEXUSS3-C-24 | — | — | — |
| 12 | Check connector VF2 | — | — | — | — | — | — | — | — |
| 13 | Ignition 2 (IGT2) | — | W23 | — | 0.5 | NEXUSS3-A-28 | — | — | — |
| 15 | Cam sensor ground (G-) | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 16 | Crank sensor - (NE-) | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 2 | Igniter 1 feedback (IGF1) | — | W49 | — | 0.5 | NEXUSS3-C-6 | — | — | — |
| 3 | Knock sensor 1 (KNK1) | — | W20 | — | 0.5 | NEXUSS3-C-23 | — | — | — |
| 4 | Check connector VF1 | — | — | — | — | — | — | — | — |
| 5 | Ignition 1 (IGT1) | — | W22 | — | 0.5 | NEXUSS3-A-27 | — | — | — |
| 6 | Cam sensor 2 + (G2+) | — | W19 | — | 0.5 | NEXUSS3-C-5 | — | — | — |
| 7 | Cam sensor 1 + (G1+) | — | W17 | — | 0.5 | NEXUSS3-C-3 | — | — | — |
| 8 | Crank sensor + (NE+) | — | W15 | — | 0.5 | NEXUSS3-C-1 | — | — | — |
OEM-D
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 11 | Injector 2&8 (#20) | — | W25 | — | 0.5 | NEXUSS3-A-2 | — | — | — |
| 12 | Injector 1&7 (#10) | — | W24 | — | 0.5 | NEXUSS3-A-1 | — | — | — |
| 13 | Power ground (E01) | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 17 | Cold start injector 1 (STJ1) | — | W36 | — | 0.5 | NEXUSS3-A-15 | — | — | — |
| 19 | O2 heater 2 (HT2) | — | W34 | — | 0.5 | NEXUSS3-C-33 | — | — | — |
| 20 | O2 heater 1 (HT1) | — | W35 | — | 0.5 | NEXUSS3-A-14 | — | — | — |
| 21 | EGR solenoid | — | — | — | — | — | — | — | — |
| 22 | Fuel pressure-up VSV (PR) | — | — | — | — | — | — | — | — |
| 24 | Injector 3&5 (#40) | — | W26 | — | 0.5 | NEXUSS3-A-3 | — | — | — |
| 25 | Injector 4&6 (#30) | — | W27 | — | 0.5 | NEXUSS3-A-4 | — | — | — |
| 26 | Power ground (E02) | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 4 | Cold start injector (STJ) | — | — | — | — | — | — | — | — |
| 5 | ISC stepper coil 4 (ISC4) | — | W40 | — | 0.5 | NEXUSS3-A-6 | — | — | — |
| 6 | ISC stepper coil 3 (ISC3) | — | W39 | — | 0.5 | NEXUSS3-A-5 | — | — | — |
| 7 | ISC stepper coil 2 (ISC2) | — | W38 | — | 0.5 | NEXUSS3-A-17 | — | — | — |
| 8 | ISC stepper coil 1 (ISC1) | — | W37 | — | 0.5 | NEXUSS3-A-16 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W10 | — | 0.5 | OEM-A-18 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-C-15 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-C-16 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | NEXUSS3-C-26 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | NEXUSS3-C-2 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | NEXUSS3-C-4 | — | — | — |
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 | NEXUSS3-A-18 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | NEXUSS3-A-25 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W5 | — | 0.85 | OEM-A-22 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-D-13 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-D-26 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | NEXUSS3-A-10 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | NEXUSS3-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 | NEXUSS3-A-13 | Ignition switch input | digital_in | single_source | |
| OEM-A-11 | Sensor supply +5V (VC) | vref | NEXUSS3-C-25 | +5V | vref | single_source | |
| OEM-A-12 | EFI main relay (B+) | power_in | NEXUSS3-A-18 + NEXUSS3-A-25 | +12V switched input + +12V switched input | power_in | single_source | |
| OEM-A-13 | EFI main relay (B1+) | power_in | NEXUSS3-A-18 + NEXUSS3-A-25 | +12V switched input + +12V switched input | power_in | single_source | |
| OEM-A-14 | Neutral start switch (NSW) | digital_in | NEXUSS3-C-18 | AVI 9 | analog_in | single_source | |
| OEM-A-16 | Intake air temperature (THA) | temp_in | NEXUSS3-C-16 | AVI 7 | analog_in | single_source | |
| OEM-A-17 | O2 right front (OXR1) | lambda_nb_in | NEXUSS3-C-12 | AVI 3 | analog_in | single_source | |
| OEM-A-18 | Sensor ground (E2) | sensor_ground | NEXUSS3-C-2 + NEXUSS3-C-26 + NEXUSS3-C-4 | Trigger - + Signal ground + Home - | sensor_ground + trigger_in | single_source | |
| OEM-A-19 | Vehicle speed (SPD) | digital_in | NEXUSS3-C-8 | SPI 4 | digital_in | single_source | |
| OEM-A-2 | Starter signal (STA) | digital_in | NEXUSS3-C-27 | AVI 10 | analog_in | single_source | |
| OEM-A-20 | Diagnostic test 2 (TE2) | digital_in | NEXUSS3-C-20 | SPI 6 | digital_in | single_source | |
| OEM-A-22 | Power ground (E1) | ground | NEXUSS3-A-10 + NEXUSS3-A-11 | Battery ground + Battery ground | ground | single_source | |
| OEM-A-4 | Throttle position (VTA1) | analog_in | NEXUSS3-C-10 | AVI 1 | analog_in | single_source | |
| OEM-A-5 | Coolant temperature (THW) | temp_in | NEXUSS3-C-11 | AVI 2 | analog_in | single_source | |
| OEM-A-6 | O2 left front (OXL1) | lambda_nb_in | NEXUSS3-C-13 | AVI 4 | analog_in | single_source | |
| OEM-A-7 | EGR temperature sensor | temp_in | NEXUSS3-C-17 | AVI 8 | analog_in | single_source | |
| OEM-A-8 | Knock/shield (KS) | knock_in | — | — | — | single_source | |
| OEM-A-9 | Diagnostic test 1 (TE1) | digital_in | NEXUSS3-C-19 | SPI 5 | digital_in | single_source | |
| OEM-B-11 | O2 right rear (OXR2) | lambda_nb_in | NEXUSS3-C-14 | AVI 5 | analog_in | single_source | |
| OEM-B-19 | Stop light switch (BK) | digital_in | NEXUSS3-C-28 | AVI 11 | analog_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 | NEXUSS3-C-15 | AVI 6 | 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 | NEXUSS3-A-26 | ECR output | low_side_out | single_source | |
| OEM-B-5 | Check-engine lamp (W) | low_side_out | NEXUSS3-A-7 | Injector 7 | injector_out | single_source | |
| OEM-B-6 | Fuel pump relay (FPR) | low_side_out | NEXUSS3-A-9 | DPO 1 | low_side_out | single_source | |
| OEM-B-7 | A/C clutch relay (ACMG) | low_side_out | NEXUSS3-A-12 | DPO 2 | low_side_out | single_source | |
| OEM-B-8 | Fuel pump control (FC) | low_side_out | NEXUSS3-A-8 | Injector 8 | injector_out | single_source | |
| OEM-C-1 | TPS idle switch (IDL) | digital_in | — | — | — | single_source | |
| OEM-C-10 | Igniter 2 feedback (IGF2) | digital_in | NEXUSS3-C-7 | SPI 3 | digital_in | single_source | |
| OEM-C-11 | Knock sensor 2 (KNK2) | knock_in | NEXUSS3-C-24 | Knock 2 | knock_in | single_source | |
| OEM-C-12 | Check connector VF2 | analog_out | — | — | — | single_source | |
| OEM-C-13 | Ignition 2 (IGT2) | ignition_out | NEXUSS3-A-28 | Ignition 2 | ignition_out | single_source | |
| OEM-C-15 | Cam sensor ground (G-) | sensor_ground | NEXUSS3-C-2 + NEXUSS3-C-26 + NEXUSS3-C-4 | Trigger - + Signal ground + Home - | sensor_ground + trigger_in | single_source | |
| OEM-C-16 | Crank sensor - (NE-) | sensor_ground | NEXUSS3-C-2 + NEXUSS3-C-26 + NEXUSS3-C-4 | Trigger - + Signal ground + Home - | sensor_ground + trigger_in | single_source | |
| OEM-C-2 | Igniter 1 feedback (IGF1) | digital_in | NEXUSS3-C-6 | SPI 2 | digital_in | single_source | |
| OEM-C-3 | Knock sensor 1 (KNK1) | knock_in | NEXUSS3-C-23 | Knock 1 | knock_in | single_source | |
| OEM-C-4 | Check connector VF1 | analog_out | — | — | — | single_source | |
| OEM-C-5 | Ignition 1 (IGT1) | ignition_out | NEXUSS3-A-27 | Ignition 1 | ignition_out | single_source | |
| OEM-C-6 | Cam sensor 2 + (G2+) | trigger_in | NEXUSS3-C-5 | SPI 1 | digital_in | single_source | |
| OEM-C-7 | Cam sensor 1 + (G1+) | trigger_in | NEXUSS3-C-3 | Home + | trigger_in | single_source | |
| OEM-C-8 | Crank sensor + (NE+) | trigger_in | NEXUSS3-C-1 | Trigger + | trigger_in | single_source | |
| OEM-D-11 | Injector 2&8 (#20) | injector_out | NEXUSS3-A-2 | Injector 2 | injector_out | single_source | |
| OEM-D-12 | Injector 1&7 (#10) | injector_out | NEXUSS3-A-1 | Injector 1 | injector_out | single_source | |
| OEM-D-13 | Power ground (E01) | ground | NEXUSS3-A-10 + NEXUSS3-A-11 | Battery ground + Battery ground | ground | single_source | |
| OEM-D-17 | Cold start injector 1 (STJ1) | low_side_out | NEXUSS3-A-15 | DPO 4 | low_side_out | single_source | |
| OEM-D-19 | O2 heater 2 (HT2) | low_side_out | NEXUSS3-C-33 | WBI 1 Heater - | low_side_out | single_source | |
| OEM-D-20 | O2 heater 1 (HT1) | low_side_out | NEXUSS3-A-14 | DPO 3 | 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 | NEXUSS3-A-3 | Injector 3 | injector_out | single_source | |
| OEM-D-25 | Injector 4&6 (#30) | injector_out | NEXUSS3-A-4 | Injector 4 | injector_out | single_source | |
| OEM-D-26 | Power ground (E02) | ground | NEXUSS3-A-10 + NEXUSS3-A-11 | Battery ground + Battery 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 | NEXUSS3-A-6 | Injector 6 | injector_out | single_source | |
| OEM-D-6 | ISC stepper coil 3 (ISC3) | low_side_out | NEXUSS3-A-5 | Injector 5 | injector_out | single_source | |
| OEM-D-7 | ISC stepper coil 2 (ISC2) | low_side_out | NEXUSS3-A-17 | DPO 6 | low_side_out | single_source | |
| OEM-D-8 | ISC stepper coil 1 (ISC1) | low_side_out | NEXUSS3-A-16 | DPO 5 | 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 | NEXUSS3-A-18 | 0.85 | no route | +12V switched input | — | |
| W4 | SP-14V-1 | NEXUSS3-A-25 | 0.85 | no route | +12V switched input | — | |
| W5 | OEM-A-22 | SP-GND-1 | 0.85 | no route | Power ground (E1) | — | |
| W6 | OEM-D-13 | SP-GND-1 | 0.85 | no route | Power ground (E01) | — | |
| W7 | OEM-D-26 | SP-GND-1 | 0.85 | no route | Power ground (E02) | — | |
| W8 | SP-GND-1 | NEXUSS3-A-10 | 0.85 | no route | Battery ground | — | |
| W9 | SP-GND-1 | NEXUSS3-A-11 | 0.85 | no route | Battery ground | — | |
| W10 | OEM-A-18 | SP-0V-1 | 0.5 | no route | Sensor ground (E2) | — | |
| W11 | OEM-C-15 | SP-0V-1 | 0.5 | no route | Cam sensor ground (G-) | — | |
| W12 | OEM-C-16 | SP-0V-1 | 0.5 | no route | Crank sensor - (NE-) | — | |
| W13 | SP-0V-1 | NEXUSS3-C-26 | 0.5 | no route | Signal ground | — | |
| W14 | OEM-A-11 | NEXUSS3-C-25 | 0.5 | no route | Sensor supply +5V (VC) | — | |
| W15 | OEM-C-8 | NEXUSS3-C-1 | 0.5 | no route | Crank sensor + (NE+) | — | |
| W16 | SP-0V-1 | NEXUSS3-C-2 | 0.5 | no route | Trigger - | — | |
| W17 | OEM-C-7 | NEXUSS3-C-3 | 0.5 | no route | Cam sensor 1 + (G1+) | — | |
| W18 | SP-0V-1 | NEXUSS3-C-4 | 0.5 | no route | Home - | — | |
| W19 | OEM-C-6 | NEXUSS3-C-5 | 0.5 | no route | Cam sensor 2 + (G2+) | — | |
| W20 | OEM-C-3 | NEXUSS3-C-23 | 0.5 | no route | Knock sensor 1 (KNK1) | — | |
| W21 | OEM-C-11 | NEXUSS3-C-24 | 0.5 | no route | Knock sensor 2 (KNK2) | — | |
| W22 | OEM-C-5 | NEXUSS3-A-27 | 0.5 | no route | Ignition 1 (IGT1) | — | |
| W23 | OEM-C-13 | NEXUSS3-A-28 | 0.5 | no route | Ignition 2 (IGT2) | — | |
| W24 | OEM-D-12 | NEXUSS3-A-1 | 0.5 | no route | Injector 1&7 (#10) | — | |
| W25 | OEM-D-11 | NEXUSS3-A-2 | 0.5 | no route | Injector 2&8 (#20) | — | |
| W26 | OEM-D-24 | NEXUSS3-A-3 | 0.5 | no route | Injector 3&5 (#40) | — | |
| W27 | OEM-D-25 | NEXUSS3-A-4 | 0.5 | no route | Injector 4&6 (#30) | — | |
| W28 | OEM-A-1 | NEXUSS3-A-13 | 0.5 | no route | Ignition switch (IGSW) | — | |
| W29 | OEM-A-4 | NEXUSS3-C-10 | 0.5 | no route | Throttle position (VTA1) | — | |
| W30 | OEM-A-5 | NEXUSS3-C-11 | 0.5 | no route | Coolant temperature (THW) | — | |
| W31 | OEM-B-4 | NEXUSS3-A-26 | 0.5 | no route | EFI main relay control (MREL) | — | |
| W32 | OEM-B-6 | NEXUSS3-A-9 | 0.5 | no route | Fuel pump relay (FPR) | — | |
| W33 | OEM-B-7 | NEXUSS3-A-12 | 0.5 | no route | A/C clutch relay (ACMG) | — | |
| W34 | OEM-D-19 | NEXUSS3-C-33 | 0.5 | no route | O2 heater 2 (HT2) | — | |
| W35 | OEM-D-20 | NEXUSS3-A-14 | 0.5 | no route | O2 heater 1 (HT1) | — | |
| W36 | OEM-D-17 | NEXUSS3-A-15 | 0.5 | no route | Cold start injector 1 (STJ1) | — | |
| W37 | OEM-D-8 | NEXUSS3-A-16 | 0.5 | no route | ISC stepper coil 1 (ISC1) | — | |
| W38 | OEM-D-7 | NEXUSS3-A-17 | 0.5 | no route | ISC stepper coil 2 (ISC2) | — | |
| W39 | OEM-D-6 | NEXUSS3-A-5 | 0.5 | no route | ISC stepper coil 3 (ISC3) | — | |
| W40 | OEM-D-5 | NEXUSS3-A-6 | 0.5 | no route | ISC stepper coil 4 (ISC4) | — | |
| W41 | OEM-B-5 | NEXUSS3-A-7 | 0.5 | no route | Check-engine lamp (W) | — | |
| W42 | OEM-B-8 | NEXUSS3-A-8 | 0.5 | no route | Fuel pump control (FC) | — | |
| W43 | OEM-A-17 | NEXUSS3-C-12 | 0.5 | no route | O2 right front (OXR1) | — | |
| W44 | OEM-A-6 | NEXUSS3-C-13 | 0.5 | no route | O2 left front (OXL1) | — | |
| W45 | OEM-B-11 | NEXUSS3-C-14 | 0.5 | no route | O2 right rear (OXR2) | — | |
| W46 | OEM-B-24 | NEXUSS3-C-15 | 0.5 | no route | O2 left rear (OXL2) | — | |
| W47 | OEM-A-16 | NEXUSS3-C-16 | 0.5 | no route | Intake air temperature (THA) | — | |
| W48 | OEM-A-7 | NEXUSS3-C-17 | 0.5 | no route | EGR temperature sensor | — | |
| W49 | OEM-C-2 | NEXUSS3-C-6 | 0.5 | no route | Igniter 1 feedback (IGF1) | — | |
| W50 | OEM-C-10 | NEXUSS3-C-7 | 0.5 | no route | Igniter 2 feedback (IGF2) | — | |
| W51 | OEM-A-19 | NEXUSS3-C-8 | 0.5 | no route | Vehicle speed (SPD) | — | |
| W52 | OEM-A-9 | NEXUSS3-C-19 | 0.5 | no route | Diagnostic test 1 (TE1) | — | |
| W53 | OEM-A-20 | NEXUSS3-C-20 | 0.5 | no route | Diagnostic test 2 (TE2) | — | |
| W54 | OEM-A-14 | NEXUSS3-C-18 | 0.5 | no route | Neutral start switch (NSW) | — | |
| W55 | OEM-A-2 | NEXUSS3-C-27 | 0.5 | no route | Starter signal (STA) | — | |
| W56 | OEM-B-19 | NEXUSS3-C-28 | 0.5 | no route | Stop light switch (BK) | — |
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 (14)
| Severity | Code | Subject | Message |
|---|---|---|---|
| warn | LOAD_UNKNOWN | NEXUSS3-A-26 | NEXUSS3-A-26 "ECR output" 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-A-14 ↔ NEXUSS3-C-18 | OEM-A-14 "Neutral start switch (NSW)" [digital_in] is wired to NEXUSS3-C-18 "AVI 9" [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 ↔ NEXUSS3-C-27 | OEM-A-2 "Starter signal (STA)" [digital_in] is wired to NEXUSS3-C-27 "AVI 10" [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-B-19 ↔ NEXUSS3-C-28 | OEM-B-19 "Stop light switch (BK)" [digital_in] is wired to NEXUSS3-C-28 "AVI 11" [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-C-6 ↔ NEXUSS3-C-5 | OEM-C-6 "Cam sensor 2 + (G2+)" [trigger_in] is wired to NEXUSS3-C-5 "SPI 1" [digital_in]. Hall-type cam/speed signals can use a digital input if it handles the frequency; VR signals cannot. |
| info | NET_FAMILY | OEM-A-16 ↔ NEXUSS3-C-16 | OEM-A-16 "Intake air temperature (THA)" [temp_in] is wired to NEXUSS3-C-16 "AVI 7" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-A-18 ↔ NEXUSS3-C-4 | OEM-A-18 "Sensor ground (E2)" [sensor_ground] is wired to NEXUSS3-C-4 "Home -" [trigger_in]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs. |
| info | NET_FAMILY | OEM-A-5 ↔ NEXUSS3-C-11 | OEM-A-5 "Coolant temperature (THW)" [temp_in] is wired to NEXUSS3-C-11 "AVI 2" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-A-7 ↔ NEXUSS3-C-17 | OEM-A-7 "EGR temperature sensor" [temp_in] is wired to NEXUSS3-C-17 "AVI 8" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-B-5 ↔ NEXUSS3-A-7 | OEM-B-5 "Check-engine lamp (W)" [low_side_out] is wired to NEXUSS3-A-7 "Injector 7" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-B-8 ↔ NEXUSS3-A-8 | OEM-B-8 "Fuel pump control (FC)" [low_side_out] is wired to NEXUSS3-A-8 "Injector 8" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-D-5 ↔ NEXUSS3-A-6 | OEM-D-5 "ISC stepper coil 4 (ISC4)" [low_side_out] is wired to NEXUSS3-A-6 "Injector 6" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-D-6 ↔ NEXUSS3-A-5 | OEM-D-6 "ISC stepper coil 3 (ISC3)" [low_side_out] is wired to NEXUSS3-A-5 "Injector 5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | UNMAPPED | OEM | 9 optional OEM pins are not mapped: OEM-A-8 Knock/shield (KS); OEM-B-20 A/T kickdown switch (KD); OEM-B-23 A/C request (AC); OEM-C-1 TPS idle switch (IDL); OEM-C-12 Check connector VF2; OEM-C-4 Check connector VF1; OEM-D-21 EGR solenoid; OEM-D-22 Fuel pressure-up VSV (PR); OEM-D-4 Cold start injector (STJ) |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-B-26 | Battery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed. | mapping-proposal |
Notes
Auto-mapped by auto_map() from the library pin data on 2026-10-11. Review every wire against both manuals before building. Not wired: - OEM-B 26: Battery constant (BATT): Haltech Nexus S3 has no battery-constant input; not needed - OEM-A 8: Knock/shield (KS): no free knock input on Haltech Nexus S3 - OEM-D 21: EGR solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on Haltech Nexus S3 - OEM-D 22: Fuel pressure-up VSV (PR): no free low_side/relay_control/heater_low_side/ls_hs/injector on Haltech Nexus S3 - OEM-D 4: Cold start injector (STJ): no free low_side/relay_control/heater_low_side/ls_hs/injector on Haltech Nexus S3 - OEM-B 20: A/T kickdown switch (KD): no free switch_in/frequency_in/analog_0_5 on Haltech Nexus S3 - OEM-B 23: A/C request (AC): no free switch_in/frequency_in/analog_0_5 on Haltech Nexus S3 - OEM-C 1: TPS idle switch (IDL): no free switch_in/frequency_in/analog_0_5 on Haltech Nexus S3 - OEM-C 4: Check connector VF1: no free analog_out on Haltech Nexus S3 - OEM-C 12: Check connector VF2: no free analog_out on Haltech Nexus S3
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | Haltech: Nexus S3 Plug 'n' Play adapter QSG (Subaru WRX/STI ADM, HT-186300) — ECU Connector A & C pinout | https://www.haltech.com/product/ht-186300-nexus-s3-plug-n-play-adapter-harness/ | archive | 2026-10-05 | 3cab7cd337c2 |
| 4 | vendor_doc | Haltech: Nexus S3/S2 ECU Overview (QSG) — specifications | https://store.haltech.com/product/ht-213000-nexus-s3-ecu-only/ | archive | 2026-10-05 | 388299668207 |
| 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/ | — | — | — |