AP1 2000–03 (F20C) → Haltech Nexus S3 HT-213000 (auto)
AP1 2000–03 (F20C) — Haltech — Nexus S3
Drawn by Michael Gnankou · Rev 0 · proposal · 2026-10-08
Before you start
| Status | proposal · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | none |
| Size of the job | 63 wires · 10 connectors · 4 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-B-1 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-B-9 | 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-B-10 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-B-2 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-B-20 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-B-22 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | NEXUSS3-A-10 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | NEXUSS3-A-11 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-C-18 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-C-30 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-C-31 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-C-7 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-0V-1 | NEXUSS3-C-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-C-19 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-C-28 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | SP-5V1-1 | NEXUSS3-C-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-C-9 | NEXUSS3-C-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-C-8 | NEXUSS3-C-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-C-21 | NEXUSS3-C-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-C-20 | NEXUSS3-C-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-C-29 | NEXUSS3-C-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-C-4 | NEXUSS3-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-C-12 | NEXUSS3-A-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-C-13 | NEXUSS3-A-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-C-14 | NEXUSS3-A-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-B-11 | NEXUSS3-A-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-B-3 | NEXUSS3-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-B-4 | NEXUSS3-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-B-5 | NEXUSS3-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-A-15 | NEXUSS3-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-A-16 | NEXUSS3-A-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-A-17 | NEXUSS3-A-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-A-20 | NEXUSS3-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-A-28 | NEXUSS3-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-B-12 | NEXUSS3-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-C-1 | NEXUSS3-C-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-C-11 | NEXUSS3-A-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-B-23 | NEXUSS3-A-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-A-1 | NEXUSS3-A-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-A-12 | NEXUSS3-A-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-A-18 | NEXUSS3-A-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-A-2 | NEXUSS3-A-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-A-3 | NEXUSS3-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-A-4 | NEXUSS3-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-A-6 | NEXUSS3-A-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-C-17 | NEXUSS3-C-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-C-27 | NEXUSS3-C-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | OEM-A-23 | NEXUSS3-C-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W51 | OEM-C-15 | NEXUSS3-C-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W52 | OEM-C-16 | NEXUSS3-C-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W53 | OEM-C-26 | NEXUSS3-C-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W54 | OEM-C-25 | NEXUSS3-C-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W55 | OEM-A-29 | NEXUSS3-C-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W56 | OEM-A-30 | NEXUSS3-C-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W57 | OEM-C-24 | NEXUSS3-C-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W58 | OEM-A-9 | NEXUSS3-C-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W59 | OEM-C-5 | NEXUSS3-C-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W60 | OEM-A-24 | NEXUSS3-C-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W61 | OEM-A-26 | NEXUSS3-C-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W62 | OEM-A-27 | NEXUSS3-C-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W63 | OEM-A-32 | 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-26 | open (OL) | +12 V supply must not touch sensor ground | |
| 3 | NEXUSS3-A-10 | NEXUSS3-C-25 | open (OL) | power ground must not touch 5 V sensor reference | |
| 4 | NEXUSS3-A-18 | NEXUSS3-C-25 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 5 | NEXUSS3-C-26 | NEXUSS3-C-25 | open (OL) | sensor ground must not touch 5 V sensor reference |
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 | — | W28 | — | 0.5 | OEM-B-11 | — | — | — |
| 10 | Battery ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 11 | Battery ground | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| 12 | DPO 2 | — | W34 | — | 0.5 | OEM-A-17 | — | — | — |
| 13 | Ignition switch input | — | — | — | — | — | — | — | — |
| 14 | DPO 3 | — | W35 | — | 0.5 | OEM-A-20 | — | — | — |
| 15 | DPO 4 | — | W36 | — | 0.5 | OEM-A-28 | — | — | — |
| 16 | DPO 5 | — | W39 | — | 0.5 | OEM-C-11 | — | — | — |
| 17 | DPO 6 | — | W40 | — | 0.5 | OEM-B-23 | — | — | — |
| 18 | +12V switched input | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 19 | HBO 1 | — | W37 | — | 0.5 | OEM-B-12 | — | — | — |
| 2 | Injector 2 | — | W29 | — | 0.5 | OEM-B-3 | — | — | — |
| 20 | HBO 2 | — | W45 | — | 0.5 | OEM-A-3 | — | — | — |
| 21 | HBO 3 | — | W46 | — | 0.5 | OEM-A-4 | — | — | — |
| 22 | HBO 4 | — | W47 | — | 0.5 | OEM-A-6 | — | — | — |
| 23 | CAN 1 High | — | — | — | — | — | — | — | — |
| 24 | CAN 1 Low | — | — | — | — | — | — | — | — |
| 25 | +12V switched input | — | W4 | — | 0.85 | SP-14V-1 | — | — | — |
| 26 | ECR output | — | W32 | — | 0.5 | OEM-A-15 | — | — | — |
| 27 | Ignition 1 | — | W24 | — | 0.5 | OEM-C-4 | — | — | — |
| 28 | Ignition 2 | — | W25 | — | 0.5 | OEM-C-12 | — | — | — |
| 29 | Ignition 3 | — | W26 | — | 0.5 | OEM-C-13 | — | — | — |
| 3 | Injector 3 | — | W30 | — | 0.5 | OEM-B-4 | — | — | — |
| 30 | Ignition 4 | — | W27 | — | 0.5 | OEM-C-14 | — | — | — |
| 31 | Ignition 5 | — | — | — | — | — | — | — | — |
| 32 | Ignition 6 | — | — | — | — | — | — | — | — |
| 33 | Ignition 7 | — | — | — | — | — | — | — | — |
| 34 | Ignition 8 | — | — | — | — | — | — | — | — |
| 4 | Injector 4 | — | W31 | — | 0.5 | OEM-B-5 | — | — | — |
| 5 | Injector 5 | — | W41 | — | 0.5 | OEM-A-1 | — | — | — |
| 6 | Injector 6 | — | W42 | — | 0.5 | OEM-A-12 | — | — | — |
| 7 | Injector 7 | — | W43 | — | 0.5 | OEM-A-18 | — | — | — |
| 8 | Injector 8 | — | W44 | — | 0.5 | OEM-A-2 | — | — | — |
| 9 | DPO 1 | — | W33 | — | 0.5 | OEM-A-16 | — | — | — |
NEXUSS3-C
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Trigger + | — | W20 | — | 0.5 | OEM-C-8 | — | — | — |
| 10 | AVI 1 | — | W48 | — | 0.5 | OEM-C-17 | — | — | — |
| 11 | AVI 2 | — | W49 | — | 0.5 | OEM-C-27 | — | — | — |
| 12 | AVI 3 | — | W50 | — | 0.5 | OEM-A-23 | — | — | — |
| 13 | AVI 4 | — | W51 | — | 0.5 | OEM-C-15 | — | — | — |
| 14 | AVI 5 | — | W52 | — | 0.5 | OEM-C-16 | — | — | — |
| 15 | AVI 6 | — | W53 | — | 0.5 | OEM-C-26 | — | — | — |
| 16 | AVI 7 | — | W54 | — | 0.5 | OEM-C-25 | — | — | — |
| 17 | AVI 8 | — | W55 | — | 0.5 | OEM-A-29 | — | — | — |
| 18 | AVI 9 | — | W56 | — | 0.5 | OEM-A-30 | — | — | — |
| 19 | SPI 5 | — | W61 | — | 0.5 | OEM-A-26 | — | — | — |
| 2 | Trigger - | — | W19 | — | 0.5 | OEM-C-9 | — | — | — |
| 20 | SPI 6 | — | W62 | — | 0.5 | OEM-A-27 | — | — | — |
| 21 | CAN 2 High | — | — | — | — | — | — | — | — |
| 22 | CAN 2 Low | — | — | — | — | — | — | — | — |
| 23 | Knock 1 | — | — | — | — | — | — | — | — |
| 24 | Knock 2 | — | — | — | — | — | — | — | — |
| 25 | +5V | — | W18 | — | 0.5 | SP-5V1-1 | — | — | — |
| 26 | Signal ground | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 27 | AVI 10 | — | W57 | — | 0.5 | OEM-C-24 | — | — | — |
| 28 | AVI 11 | — | W63 | — | 0.5 | OEM-A-32 | — | — | — |
| 29 | WBI 1 Heater + | — | — | — | — | — | — | — | — |
| 3 | Home + | — | W22 | — | 0.5 | OEM-C-20 | — | — | — |
| 30 | WBI 1 Input | — | — | — | — | — | — | — | — |
| 31 | WBI 1 Pump | — | — | — | — | — | — | — | — |
| 32 | WBI 1 Nernst | — | — | — | — | — | — | — | — |
| 33 | WBI 1 Heater - | — | W38 | — | 0.5 | OEM-C-1 | — | — | — |
| 34 | WBI 1 Cal | — | — | — | — | — | — | — | — |
| 4 | Home - | — | W21 | — | 0.5 | OEM-C-21 | — | — | — |
| 5 | SPI 1 | — | W23 | — | 0.5 | OEM-C-29 | — | — | — |
| 6 | SPI 2 | — | W58 | — | 0.5 | OEM-A-9 | — | — | — |
| 7 | SPI 3 | — | W59 | — | 0.5 | OEM-C-5 | — | — | — |
| 8 | SPI 4 | — | W60 | — | 0.5 | OEM-A-24 | — | — | — |
| 9 | +8V | — | — | — | — | — | — | — | — |
OEM-A
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Coolant temp gauge drive | — | W41 | — | 0.5 | NEXUSS3-A-5 | — | — | — |
| 2 | Air control valve solenoid | — | W44 | — | 0.5 | NEXUSS3-A-8 | — | — | — |
| 3 | Evap bypass solenoid | — | W45 | — | 0.5 | NEXUSS3-A-20 | — | — | — |
| 4 | Evap canister vent shut valve | — | W46 | — | 0.5 | NEXUSS3-A-21 | — | — | — |
| 5 | NC | — | — | — | — | — | — | — | — |
| 6 | Evap canister purge valve | — | W47 | — | 0.5 | NEXUSS3-A-22 | — | — | — |
| 7 | NC | — | — | — | — | — | — | — | — |
| 8 | NC | — | — | — | — | — | — | — | — |
| 9 | Vehicle speed sensor | — | W58 | — | 0.5 | NEXUSS3-C-6 | — | — | — |
| 10 | Service check signal | — | — | — | — | — | — | — | — |
| 11 | NC | — | — | — | — | — | — | — | — |
| 12 | Immobilizer indicator light | — | W42 | — | 0.5 | NEXUSS3-A-6 | — | — | — |
| 13 | Immobilizer enable signal | — | — | — | — | — | — | — | — |
| 14 | NC | — | — | — | — | — | — | — | — |
| 15 | Fuel pump relay (USDM) | — | W32 | — | 0.5 | NEXUSS3-A-26 | — | — | — |
| 16 | Fuel pump relay (JDM) | — | W33 | — | 0.5 | NEXUSS3-A-9 | — | — | — |
| 17 | A/C clutch relay | — | W34 | — | 0.5 | NEXUSS3-A-12 | — | — | — |
| 18 | Check engine light (MIL) | — | W43 | — | 0.5 | NEXUSS3-A-7 | — | — | — |
| 19 | Tacho output | — | — | — | — | — | — | — | — |
| 20 | Radiator fan relay | — | W35 | — | 0.5 | NEXUSS3-A-14 | — | — | — |
| 21 | K-Line | — | — | — | — | — | — | — | — |
| 22 | NC | — | — | — | — | — | — | — | — |
| 23 | Secondary O2 sensor | — | W50 | — | 0.5 | NEXUSS3-C-12 | — | — | — |
| 24 | Starter switch signal | — | W60 | — | 0.5 | NEXUSS3-C-8 | — | — | — |
| 25 | Immobilizer code | — | — | — | — | — | — | — | — |
| 26 | Power steering load detect | — | W61 | — | 0.5 | NEXUSS3-C-19 | — | — | — |
| 27 | A/C switch (request) | — | W62 | — | 0.5 | NEXUSS3-C-20 | — | — | — |
| 28 | Air pump relay | — | W36 | — | 0.5 | NEXUSS3-A-15 | — | — | — |
| 29 | Fuel tank pressure sensor | — | W55 | — | 0.5 | NEXUSS3-C-17 | — | — | — |
| 30 | Electrical load detector | — | W56 | — | 0.5 | NEXUSS3-C-18 | — | — | — |
| 31 | NC | — | — | — | — | — | — | — | — |
| 32 | Brake switch | — | W63 | — | 0.5 | NEXUSS3-C-28 | — | — | — |
OEM-B
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Power source 1 (main relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 2 | Power ground 1 | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 3 | Injector 2 | — | W29 | — | 0.5 | NEXUSS3-A-2 | — | — | — |
| 4 | Injector 3 | — | W30 | — | 0.5 | NEXUSS3-A-3 | — | — | — |
| 5 | Injector 4 | — | W31 | — | 0.5 | NEXUSS3-A-4 | — | — | — |
| 6 | NC | — | — | — | — | — | — | — | — |
| 7 | NC | — | — | — | — | — | — | — | — |
| 8 | NC | — | — | — | — | — | — | — | — |
| 9 | Power source 2 (main relay) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 10 | Power ground 2 | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 11 | Injector 1 | — | W28 | — | 0.5 | NEXUSS3-A-1 | — | — | — |
| 12 | VTEC solenoid | — | W37 | — | 0.5 | NEXUSS3-A-19 | — | — | — |
| 13 | NC | — | — | — | — | — | — | — | — |
| 14 | NC | — | — | — | — | — | — | — | — |
| 15 | NC | — | — | — | — | — | — | — | — |
| 16 | NC | — | — | — | — | — | — | — | — |
| 17 | NC | — | — | — | — | — | — | — | — |
| 18 | NC | — | — | — | — | — | — | — | — |
| 19 | NC | — | — | — | — | — | — | — | — |
| 20 | Ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 21 | Backup power (battery constant) | — | — | — | — | — | — | — | — |
| 22 | Ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 23 | Idle air control valve | — | W40 | — | 0.5 | NEXUSS3-A-17 | — | — | — |
| 24 | NC | — | — | — | — | — | — | — | — |
| 25 | NC | — | — | — | — | — | — | — | — |
OEM-C
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Primary O2 heater | — | W38 | — | 0.5 | NEXUSS3-C-33 | — | — | — |
| 2 | Alternator control | — | — | — | — | — | — | — | — |
| 3 | Knock sensor | — | — | — | — | — | — | — | — |
| 4 | Ignition coil 1 | — | W24 | — | 0.5 | NEXUSS3-A-27 | — | — | — |
| 5 | Alternator FR signal | — | W59 | — | 0.5 | NEXUSS3-C-7 | — | — | — |
| 6 | NC | — | — | — | — | — | — | — | — |
| 7 | Sensor ground 1 | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 8 | Crank sensor + (CKP+) | — | W20 | — | 0.5 | NEXUSS3-C-1 | — | — | — |
| 9 | Crank sensor − (CKP−) | — | W19 | — | 0.5 | NEXUSS3-C-2 | — | — | — |
| 10 | VTEC pressure switch | — | — | — | — | — | — | — | — |
| 11 | Secondary O2 heater control | — | W39 | — | 0.5 | NEXUSS3-A-16 | — | — | — |
| 12 | Ignition coil 2 | — | W25 | — | 0.5 | NEXUSS3-A-28 | — | — | — |
| 13 | Ignition coil 3 | — | W26 | — | 0.5 | NEXUSS3-A-29 | — | — | — |
| 14 | Ignition coil 4 | — | W27 | — | 0.5 | NEXUSS3-A-30 | — | — | — |
| 15 | Secondary O2 sensor | — | W51 | — | 0.5 | NEXUSS3-C-13 | — | — | — |
| 16 | Primary O2 sensor | — | W52 | — | 0.5 | NEXUSS3-C-14 | — | — | — |
| 17 | MAP sensor | — | W48 | — | 0.5 | NEXUSS3-C-10 | — | — | — |
| 18 | Sensor ground 2 | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | Sensor 5V supply 1 (MAP) | — | W16 | — | 0.5 | SP-5V1-1 | — | — | — |
| 20 | Cam (TDC1) sensor + | — | W22 | — | 0.5 | NEXUSS3-C-3 | — | — | — |
| 21 | Cam (TDC1) sensor − | — | W21 | — | 0.5 | NEXUSS3-C-4 | — | — | — |
| 22 | Knock sensor | — | — | — | — | — | — | — | — |
| 23 | NC | — | — | — | — | — | — | — | — |
| 24 | Air pump electric current sensor | — | W57 | — | 0.5 | NEXUSS3-C-27 | — | — | — |
| 25 | Intake air temp sensor | — | W54 | — | 0.5 | NEXUSS3-C-16 | — | — | — |
| 26 | Coolant temp sensor | — | W53 | — | 0.5 | NEXUSS3-C-15 | — | — | — |
| 27 | Throttle position sensor | — | W49 | — | 0.5 | NEXUSS3-C-11 | — | — | — |
| 28 | Sensor 5V supply 2 | — | W17 | — | 0.5 | SP-5V1-1 | — | — | — |
| 29 | Cam (TDC2) sensor + | — | W23 | — | 0.5 | NEXUSS3-C-5 | — | — | — |
| 30 | Cam (TDC2) sensor − | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 31 | Timing ground | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
OEM-D
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | NC | — | — | — | — | — | — | — | — |
| 2 | NC | — | — | — | — | — | — | — | — |
| 3 | NC | — | — | — | — | — | — | — | — |
| 4 | NC | — | — | — | — | — | — | — | — |
| 5 | NC | — | — | — | — | — | — | — | — |
| 6 | NC | — | — | — | — | — | — | — | — |
| 7 | NC | — | — | — | — | — | — | — | — |
| 8 | NC | — | — | — | — | — | — | — | — |
| 9 | NC | — | — | — | — | — | — | — | — |
| 10 | NC | — | — | — | — | — | — | — | — |
| 11 | NC | — | — | — | — | — | — | — | — |
| 12 | NC | — | — | — | — | — | — | — | — |
| 13 | NC | — | — | — | — | — | — | — | — |
| 14 | NC | — | — | — | — | — | — | — | — |
| 15 | NC | — | — | — | — | — | — | — | — |
| 16 | NC | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W11 | — | 0.5 | OEM-C-18 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-C-30 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-C-31 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | OEM-C-7 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | NEXUSS3-C-26 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-B-1 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-B-9 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | NEXUSS3-A-18 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | NEXUSS3-A-25 | — | — | — |
SP-5V1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W16 | — | 0.5 | OEM-C-19 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | OEM-C-28 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | NEXUSS3-C-25 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W5 | — | 0.85 | OEM-B-10 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-B-2 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-B-20 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | OEM-B-22 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | NEXUSS3-A-10 | — | — | — |
| 1 | — | — | W10 | — | 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 | Coolant temp gauge drive | low_side_out | NEXUSS3-A-5 | Injector 5 | injector_out | corroborated | |
| OEM-A-10 | Service check signal | — | — | — | — | single_source | |
| OEM-A-11 | NC | — | — | — | — | unverified | |
| OEM-A-12 | Immobilizer indicator light | low_side_out | NEXUSS3-A-6 | Injector 6 | injector_out | single_source | |
| OEM-A-13 | Immobilizer enable signal | — | — | — | — | single_source | |
| OEM-A-14 | NC | — | — | — | — | unverified | |
| OEM-A-15 | Fuel pump relay (USDM) | low_side_out | NEXUSS3-A-26 | ECR output | low_side_out | corroborated | |
| OEM-A-16 | Fuel pump relay (JDM) | low_side_out | NEXUSS3-A-9 | DPO 1 | low_side_out | single_source | |
| OEM-A-17 | A/C clutch relay | low_side_out | NEXUSS3-A-12 | DPO 2 | low_side_out | corroborated | |
| OEM-A-18 | Check engine light (MIL) | low_side_out | NEXUSS3-A-7 | Injector 7 | injector_out | corroborated | |
| OEM-A-19 | Tacho output | tacho_out | — | — | — | corroborated | |
| OEM-A-2 | Air control valve solenoid | low_side_out | NEXUSS3-A-8 | Injector 8 | injector_out | single_source | |
| OEM-A-20 | Radiator fan relay | low_side_out | NEXUSS3-A-14 | DPO 3 | low_side_out | corroborated | |
| OEM-A-21 | K-Line | serial | — | — | — | single_source | |
| OEM-A-22 | NC | — | — | — | — | unverified | |
| OEM-A-23 | Secondary O2 sensor | lambda_nb_in | NEXUSS3-C-12 | AVI 3 | analog_in | single_source | |
| OEM-A-24 | Starter switch signal | digital_in | NEXUSS3-C-8 | SPI 4 | digital_in | corroborated | |
| OEM-A-25 | Immobilizer code | — | — | — | — | single_source | |
| OEM-A-26 | Power steering load detect | digital_in | NEXUSS3-C-19 | SPI 5 | digital_in | corroborated | |
| OEM-A-27 | A/C switch (request) | digital_in | NEXUSS3-C-20 | SPI 6 | digital_in | corroborated | |
| OEM-A-28 | Air pump relay | low_side_out | NEXUSS3-A-15 | DPO 4 | low_side_out | corroborated | |
| OEM-A-29 | Fuel tank pressure sensor | analog_in | NEXUSS3-C-17 | AVI 8 | analog_in | corroborated | |
| OEM-A-3 | Evap bypass solenoid | low_side_out | NEXUSS3-A-20 | HBO 2 | hbridge_out | single_source | |
| OEM-A-30 | Electrical load detector | analog_in | NEXUSS3-C-18 | AVI 9 | analog_in | corroborated | |
| OEM-A-31 | NC | — | — | — | — | unverified | |
| OEM-A-32 | Brake switch | digital_in | NEXUSS3-C-28 | AVI 11 | analog_in | corroborated | |
| OEM-A-4 | Evap canister vent shut valve | low_side_out | NEXUSS3-A-21 | HBO 3 | hbridge_out | single_source | |
| OEM-A-5 | NC | — | — | — | — | unverified | |
| OEM-A-6 | Evap canister purge valve | low_side_out | NEXUSS3-A-22 | HBO 4 | hbridge_out | single_source | |
| OEM-A-7 | NC | — | — | — | — | unverified | |
| OEM-A-8 | NC | — | — | — | — | unverified | |
| OEM-A-9 | Vehicle speed sensor | digital_in | NEXUSS3-C-6 | SPI 2 | digital_in | corroborated | |
| OEM-B-1 | Power source 1 (main relay) | power_in | NEXUSS3-A-18 + NEXUSS3-A-25 | +12V switched input + +12V switched input | power_in | corroborated | |
| OEM-B-10 | Power ground 2 | ground | NEXUSS3-A-10 + NEXUSS3-A-11 | Battery ground + Battery ground | ground | single_source | |
| OEM-B-11 | Injector 1 | injector_out | NEXUSS3-A-1 | Injector 1 | injector_out | corroborated | |
| OEM-B-12 | VTEC solenoid | high_side_out | NEXUSS3-A-19 | HBO 1 | hbridge_out | corroborated | |
| OEM-B-13 | NC | — | — | — | — | unverified | |
| OEM-B-14 | NC | — | — | — | — | unverified | |
| OEM-B-15 | NC | — | — | — | — | unverified | |
| OEM-B-16 | NC | — | — | — | — | unverified | |
| OEM-B-17 | NC | — | — | — | — | unverified | |
| OEM-B-18 | NC | — | — | — | — | unverified | |
| OEM-B-19 | NC | — | — | — | — | unverified | |
| OEM-B-2 | Power ground 1 | ground | NEXUSS3-A-10 + NEXUSS3-A-11 | Battery ground + Battery ground | ground | corroborated | |
| OEM-B-20 | Ground | ground | NEXUSS3-A-10 + NEXUSS3-A-11 | Battery ground + Battery ground | ground | single_source | |
| OEM-B-21 | Backup power (battery constant) | power_in | — | — | — | single_source | |
| OEM-B-22 | Ground | ground | NEXUSS3-A-10 + NEXUSS3-A-11 | Battery ground + Battery ground | ground | single_source | |
| OEM-B-23 | Idle air control valve | low_side_out | NEXUSS3-A-17 | DPO 6 | low_side_out | corroborated | |
| OEM-B-24 | NC | — | — | — | — | unverified | |
| OEM-B-25 | NC | — | — | — | — | unverified | |
| OEM-B-3 | Injector 2 | injector_out | NEXUSS3-A-2 | Injector 2 | injector_out | corroborated | |
| OEM-B-4 | Injector 3 | injector_out | NEXUSS3-A-3 | Injector 3 | injector_out | corroborated | |
| OEM-B-5 | Injector 4 | injector_out | NEXUSS3-A-4 | Injector 4 | injector_out | corroborated | |
| OEM-B-6 | NC | — | — | — | — | unverified | |
| OEM-B-7 | NC | — | — | — | — | unverified | |
| OEM-B-8 | NC | — | — | — | — | unverified | |
| OEM-B-9 | Power source 2 (main relay) | power_in | NEXUSS3-A-18 + NEXUSS3-A-25 | +12V switched input + +12V switched input | power_in | corroborated | |
| OEM-C-1 | Primary O2 heater | low_side_out | NEXUSS3-C-33 | WBI 1 Heater - | low_side_out | corroborated | |
| OEM-C-10 | VTEC pressure switch | digital_in | — | — | — | corroborated | |
| OEM-C-11 | Secondary O2 heater control | low_side_out | NEXUSS3-A-16 | DPO 5 | low_side_out | single_source | |
| OEM-C-12 | Ignition coil 2 | ignition_out | NEXUSS3-A-28 | Ignition 2 | ignition_out | corroborated | |
| OEM-C-13 | Ignition coil 3 | ignition_out | NEXUSS3-A-29 | Ignition 3 | ignition_out | corroborated | |
| OEM-C-14 | Ignition coil 4 | ignition_out | NEXUSS3-A-30 | Ignition 4 | ignition_out | corroborated | |
| OEM-C-15 | Secondary O2 sensor | lambda_nb_in | NEXUSS3-C-13 | AVI 4 | analog_in | corroborated | |
| OEM-C-16 | Primary O2 sensor | lambda_nb_in | NEXUSS3-C-14 | AVI 5 | analog_in | corroborated | |
| OEM-C-17 | MAP sensor | analog_in | NEXUSS3-C-10 | AVI 1 | analog_in | corroborated | |
| OEM-C-18 | Sensor ground 2 | sensor_ground | NEXUSS3-C-26 | Signal ground | sensor_ground | corroborated | |
| OEM-C-19 | Sensor 5V supply 1 (MAP) | vref | NEXUSS3-C-25 | +5V | vref | corroborated | |
| OEM-C-2 | Alternator control | low_side_out | — | — | — | single_source | |
| OEM-C-20 | Cam (TDC1) sensor + | trigger_in | NEXUSS3-C-3 | Home + | trigger_in | corroborated | |
| OEM-C-21 | Cam (TDC1) sensor − | trigger_in | NEXUSS3-C-4 | Home - | trigger_in | corroborated | |
| OEM-C-22 | Knock sensor | knock_in | — | — | — | conflict | |
| OEM-C-23 | NC | — | — | — | — | unverified | |
| OEM-C-24 | Air pump electric current sensor | analog_in | NEXUSS3-C-27 | AVI 10 | analog_in | single_source | |
| OEM-C-25 | Intake air temp sensor | temp_in | NEXUSS3-C-16 | AVI 7 | analog_in | corroborated | |
| OEM-C-26 | Coolant temp sensor | temp_in | NEXUSS3-C-15 | AVI 6 | analog_in | corroborated | |
| OEM-C-27 | Throttle position sensor | analog_in | NEXUSS3-C-11 | AVI 2 | analog_in | corroborated | |
| OEM-C-28 | Sensor 5V supply 2 | vref | NEXUSS3-C-25 | +5V | vref | corroborated | |
| OEM-C-29 | Cam (TDC2) sensor + | trigger_in | NEXUSS3-C-5 | SPI 1 | digital_in | corroborated | |
| OEM-C-3 | Knock sensor | knock_in | — | — | — | conflict | |
| OEM-C-30 | Cam (TDC2) sensor − | sensor_ground | NEXUSS3-C-26 | Signal ground | sensor_ground | corroborated | |
| OEM-C-31 | Timing ground | sensor_ground | NEXUSS3-C-26 | Signal ground | sensor_ground | single_source | |
| OEM-C-4 | Ignition coil 1 | ignition_out | NEXUSS3-A-27 | Ignition 1 | ignition_out | corroborated | |
| OEM-C-5 | Alternator FR signal | digital_in | NEXUSS3-C-7 | SPI 3 | digital_in | single_source | |
| OEM-C-6 | NC | — | — | — | — | unverified | |
| OEM-C-7 | Sensor ground 1 | sensor_ground | NEXUSS3-C-26 | Signal ground | sensor_ground | corroborated | |
| OEM-C-8 | Crank sensor + (CKP+) | trigger_in | NEXUSS3-C-1 | Trigger + | trigger_in | corroborated | |
| OEM-C-9 | Crank sensor − (CKP−) | trigger_in | NEXUSS3-C-2 | Trigger - | trigger_in | corroborated | |
| OEM-D-1 | NC | — | — | — | — | unverified | |
| OEM-D-10 | NC | — | — | — | — | unverified | |
| OEM-D-11 | NC | — | — | — | — | unverified | |
| OEM-D-12 | NC | — | — | — | — | unverified | |
| OEM-D-13 | NC | — | — | — | — | unverified | |
| OEM-D-14 | NC | — | — | — | — | unverified | |
| OEM-D-15 | NC | — | — | — | — | unverified | |
| OEM-D-16 | NC | — | — | — | — | unverified | |
| OEM-D-2 | NC | — | — | — | — | unverified | |
| OEM-D-3 | NC | — | — | — | — | unverified | |
| OEM-D-4 | NC | — | — | — | — | unverified | |
| OEM-D-5 | NC | — | — | — | — | unverified | |
| OEM-D-6 | NC | — | — | — | — | unverified | |
| OEM-D-7 | NC | — | — | — | — | unverified | |
| OEM-D-8 | NC | — | — | — | — | unverified | |
| OEM-D-9 | NC | — | — | — | — | unverified |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-B-1 | SP-14V-1 | 0.85 | no route | Power source 1 (main relay) | — | |
| W2 | OEM-B-9 | SP-14V-1 | 0.85 | no route | Power source 2 (main relay) | — | |
| 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-B-10 | SP-GND-1 | 0.85 | no route | Power ground 2 | — | |
| W6 | OEM-B-2 | SP-GND-1 | 0.85 | no route | Power ground 1 | — | |
| W7 | OEM-B-20 | SP-GND-1 | 0.85 | no route | Ground | — | |
| W8 | OEM-B-22 | SP-GND-1 | 0.85 | no route | Ground | — | |
| W9 | SP-GND-1 | NEXUSS3-A-10 | 0.85 | no route | Battery ground | — | |
| W10 | SP-GND-1 | NEXUSS3-A-11 | 0.85 | no route | Battery ground | — | |
| W11 | OEM-C-18 | SP-0V-1 | 0.5 | no route | Sensor ground 2 | — | |
| W12 | OEM-C-30 | SP-0V-1 | 0.5 | no route | Cam (TDC2) sensor − | — | |
| W13 | OEM-C-31 | SP-0V-1 | 0.5 | no route | Timing ground | — | |
| W14 | OEM-C-7 | SP-0V-1 | 0.5 | no route | Sensor ground 1 | — | |
| W15 | SP-0V-1 | NEXUSS3-C-26 | 0.5 | no route | Signal ground | — | |
| W16 | OEM-C-19 | SP-5V1-1 | 0.5 | no route | Sensor 5V supply 1 (MAP) | — | |
| W17 | OEM-C-28 | SP-5V1-1 | 0.5 | no route | Sensor 5V supply 2 | — | |
| W18 | SP-5V1-1 | NEXUSS3-C-25 | 0.5 | no route | +5V | — | |
| W19 | OEM-C-9 | NEXUSS3-C-2 | 0.5 | no route | Crank sensor − (CKP−) | — | |
| W20 | OEM-C-8 | NEXUSS3-C-1 | 0.5 | no route | Crank sensor + (CKP+) | — | |
| W21 | OEM-C-21 | NEXUSS3-C-4 | 0.5 | no route | Cam (TDC1) sensor − | — | |
| W22 | OEM-C-20 | NEXUSS3-C-3 | 0.5 | no route | Cam (TDC1) sensor + | — | |
| W23 | OEM-C-29 | NEXUSS3-C-5 | 0.5 | no route | Cam (TDC2) sensor + | — | |
| W24 | OEM-C-4 | NEXUSS3-A-27 | 0.5 | no route | Ignition coil 1 | — | |
| W25 | OEM-C-12 | NEXUSS3-A-28 | 0.5 | no route | Ignition coil 2 | — | |
| W26 | OEM-C-13 | NEXUSS3-A-29 | 0.5 | no route | Ignition coil 3 | — | |
| W27 | OEM-C-14 | NEXUSS3-A-30 | 0.5 | no route | Ignition coil 4 | — | |
| W28 | OEM-B-11 | NEXUSS3-A-1 | 0.5 | no route | Injector 1 | — | |
| W29 | OEM-B-3 | NEXUSS3-A-2 | 0.5 | no route | Injector 2 | — | |
| W30 | OEM-B-4 | NEXUSS3-A-3 | 0.5 | no route | Injector 3 | — | |
| W31 | OEM-B-5 | NEXUSS3-A-4 | 0.5 | no route | Injector 4 | — | |
| W32 | OEM-A-15 | NEXUSS3-A-26 | 0.5 | no route | Fuel pump relay (USDM) | — | |
| W33 | OEM-A-16 | NEXUSS3-A-9 | 0.5 | no route | Fuel pump relay (JDM) | — | |
| W34 | OEM-A-17 | NEXUSS3-A-12 | 0.5 | no route | A/C clutch relay | — | |
| W35 | OEM-A-20 | NEXUSS3-A-14 | 0.5 | no route | Radiator fan relay | — | |
| W36 | OEM-A-28 | NEXUSS3-A-15 | 0.5 | no route | Air pump relay | — | |
| W37 | OEM-B-12 | NEXUSS3-A-19 | 0.5 | no route | VTEC solenoid | — | |
| W38 | OEM-C-1 | NEXUSS3-C-33 | 0.5 | no route | Primary O2 heater | — | |
| W39 | OEM-C-11 | NEXUSS3-A-16 | 0.5 | no route | Secondary O2 heater control | — | |
| W40 | OEM-B-23 | NEXUSS3-A-17 | 0.5 | no route | Idle air control valve | — | |
| W41 | OEM-A-1 | NEXUSS3-A-5 | 0.5 | no route | Coolant temp gauge drive | — | |
| W42 | OEM-A-12 | NEXUSS3-A-6 | 0.5 | no route | Immobilizer indicator light | — | |
| W43 | OEM-A-18 | NEXUSS3-A-7 | 0.5 | no route | Check engine light (MIL) | — | |
| W44 | OEM-A-2 | NEXUSS3-A-8 | 0.5 | no route | Air control valve solenoid | — | |
| W45 | OEM-A-3 | NEXUSS3-A-20 | 0.5 | no route | Evap bypass solenoid | — | |
| W46 | OEM-A-4 | NEXUSS3-A-21 | 0.5 | no route | Evap canister vent shut valve | — | |
| W47 | OEM-A-6 | NEXUSS3-A-22 | 0.5 | no route | Evap canister purge valve | — | |
| W48 | OEM-C-17 | NEXUSS3-C-10 | 0.5 | no route | MAP sensor | — | |
| W49 | OEM-C-27 | NEXUSS3-C-11 | 0.5 | no route | Throttle position sensor | — | |
| W50 | OEM-A-23 | NEXUSS3-C-12 | 0.5 | no route | Secondary O2 sensor | — | |
| W51 | OEM-C-15 | NEXUSS3-C-13 | 0.5 | no route | Secondary O2 sensor | — | |
| W52 | OEM-C-16 | NEXUSS3-C-14 | 0.5 | no route | Primary O2 sensor | — | |
| W53 | OEM-C-26 | NEXUSS3-C-15 | 0.5 | no route | Coolant temp sensor | — | |
| W54 | OEM-C-25 | NEXUSS3-C-16 | 0.5 | no route | Intake air temp sensor | — | |
| W55 | OEM-A-29 | NEXUSS3-C-17 | 0.5 | no route | Fuel tank pressure sensor | — | |
| W56 | OEM-A-30 | NEXUSS3-C-18 | 0.5 | no route | Electrical load detector | — | |
| W57 | OEM-C-24 | NEXUSS3-C-27 | 0.5 | no route | Air pump electric current sensor | — | |
| W58 | OEM-A-9 | NEXUSS3-C-6 | 0.5 | no route | Vehicle speed sensor | — | |
| W59 | OEM-C-5 | NEXUSS3-C-7 | 0.5 | no route | Alternator FR signal | — | |
| W60 | OEM-A-24 | NEXUSS3-C-8 | 0.5 | no route | Starter switch signal | — | |
| W61 | OEM-A-26 | NEXUSS3-C-19 | 0.5 | no route | Power steering load detect | — | |
| W62 | OEM-A-27 | NEXUSS3-C-20 | 0.5 | no route | A/C switch (request) | — | |
| W63 | OEM-A-32 | NEXUSS3-C-28 | 0.5 | no route | Brake switch | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| connector | 179679-6 | TE | S2000 2000–05 ECU harness plug B (25P, TE 040 Multi-Lock) | 1.000 | ea |
| connector | 179680-5 | TE | S2000 2000–05 ECU harness plug C (31P, TE 040 Multi-Lock) | 1.000 | ea |
| connector | 179681-6 | TE | S2000 2000–05 ECU harness plug A (32P, TE 040 Multi-Lock) | 1.000 | ea |
| connector | S2K-0005-ECU-D | Honda | S2000 2000–05 ECU plug D (P/N unknown) | 1.000 | ea |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (15)
| Severity | Code | Subject | Message |
|---|---|---|---|
| warn | LOAD_UNKNOWN | NEXUSS3-A-26 | NEXUSS3-A-26 "ECR output" drives OEM-A-15 Fuel pump relay (USDM) (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | NET_FAMILY | OEM-A-3 ↔ NEXUSS3-A-20 | OEM-A-3 "Evap bypass solenoid" [low_side_out] is wired to NEXUSS3-A-20 "HBO 2" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-A-32 ↔ NEXUSS3-C-28 | OEM-A-32 "Brake switch" [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-A-4 ↔ NEXUSS3-A-21 | OEM-A-4 "Evap canister vent shut valve" [low_side_out] is wired to NEXUSS3-A-21 "HBO 3" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-A-6 ↔ NEXUSS3-A-22 | OEM-A-6 "Evap canister purge valve" [low_side_out] is wired to NEXUSS3-A-22 "HBO 4" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-B-12 ↔ NEXUSS3-A-19 | OEM-B-12 "VTEC solenoid" [high_side_out] is wired to NEXUSS3-A-19 "HBO 1" [hbridge_out]. A half-bridge can act as a high-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-C-29 ↔ NEXUSS3-C-5 | OEM-C-29 "Cam (TDC2) sensor +" [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. |
| warn | SUPPLY_GROUP | NEXUSS3-C-25 + OEM-C-19 + OEM-C-28 + SP-5V1-1 | Supplies meant to stay independent share one net: OEM-C-19 [s2k_vcc1], OEM-C-28 [s2k_vcc2]. The new ECU has no free 5 V reference, so they share one: normal on a standalone, but a short on any of these sensors drops them all. |
| info | NET_FAMILY | OEM-A-1 ↔ NEXUSS3-A-5 | OEM-A-1 "Coolant temp gauge drive" [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 | NET_FAMILY | OEM-A-12 ↔ NEXUSS3-A-6 | OEM-A-12 "Immobilizer indicator light" [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-A-18 ↔ NEXUSS3-A-7 | OEM-A-18 "Check engine light (MIL)" [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-A-2 ↔ NEXUSS3-A-8 | OEM-A-2 "Air control valve solenoid" [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-C-25 ↔ NEXUSS3-C-16 | OEM-C-25 "Intake air temp sensor" [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-C-26 ↔ NEXUSS3-C-15 | OEM-C-26 "Coolant temp sensor" [temp_in] is wired to NEXUSS3-C-15 "AVI 6" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | UNMAPPED | OEM | 10 optional OEM pins are not mapped: OEM-A-10 Service check signal; OEM-A-13 Immobilizer enable signal; OEM-A-19 Tacho output; OEM-A-21 K-Line; OEM-A-25 Immobilizer code; OEM-B-21 Backup power (battery constant); OEM-C-10 VTEC pressure switch; OEM-C-2 Alternator control; OEM-C-22 Knock sensor; OEM-C-3 Knock sensor |
Accepted (0)
| Code | Subject | Reason | By |
|---|
Notes
Auto-mapped by auto_map() from the library pin data on 2026-10-06. Review every wire against both manuals before building. Not wired: - OEM-B 21: Backup power (battery constant): Haltech Nexus S3 has no battery-constant input; not needed - OEM-C 22: Knock sensor: 2 stock pins named "Knock sensor" without a documented polarity / pairing; wire by hand - OEM-C 3: Knock sensor: 2 stock pins named "Knock sensor" without a documented polarity / pairing; wire by hand - OEM-C 2: Alternator control: no free low_side/ls_hs/injector/hbridge on Haltech Nexus S3 - OEM-A 19: Tacho output: no free tacho/frequency_out/low_side/ls_hs on Haltech Nexus S3 - OEM-C 10: VTEC pressure switch: no free switch_in/frequency_in/analog_0_5 on Haltech Nexus S3 - OEM-A 21: K-Line: no free k_line on Haltech Nexus S3 - OEM-A 10: Service check signal: not classified in the library; wire by hand - OEM-A 13: Immobilizer enable signal: not classified in the library; wire by hand - OEM-A 25: Immobilizer code: not classified in the library; wire by hand - NEXUSS3-A 13: Ignition switch input: not fed (the stock ECU has no ignition-sense pin); feed it from a switched-ignition source
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | AEM 30-6052 Series 2 Plug & Play EMS, 2000–2005 S2000 (original ECU pinout) | https://documents.aemelectronics.com/techlibrary_30-6052_series_2_plug___play_ems.pdf | — | 2026-10-05 | 9f79620fff5a |
| 4 | vendor_doc | Haltech KB: F20C (AP1) engine | https://support.haltech.com/portal/en/kb/articles/f20c-ap1-engine | — | 2026-10-05 | e804da29d014 |
| 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 |
| 4 | vendor_doc | Link S2000 AP1 PlugIn installation manual | https://linkecu.com/documentation/S2000X.pdf | — | 2026-10-05 | d12b0ff3f006 |
| 2 | forum | AllPinouts: 2000–2005 Honda S2000 ECU | https://allpinouts.org/pinouts/connectors/car/2000-2005-honda-s2000-ecu/ | archive | 2026-10-05 | 81d874e0385d |
| 2 | forum | Autodata blog: ECU Pinout Honda S2000 2000-2004 | http://autodatas.blogspot.com/2012/11/ecu-pinout-honda-s2000-2000-2004.html | — | 2026-10-05 | 33b93af7640e |
| 2 | derived | Typical load estimates (relay coil ~0.2 A, high-Z injector ~1.2 A, VVT solenoid ~1 A) | — | — | — | — |