AP1 2000–03 (F20C) → Haltech Nexus S3 HT-213000 (auto)
AP1 2000–03 (F20C) — Haltech — Nexus S3
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-05
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 | — | W26 | — | 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 | — | W32 | — | 0.5 | OEM-A-17 | — | — | — |
| 13 | Ignition switch input | — | — | — | — | — | — | — | — |
| 14 | DPO 3 | — | W33 | — | 0.5 | OEM-A-20 | — | — | — |
| 15 | DPO 4 | — | W34 | — | 0.5 | OEM-A-28 | — | — | — |
| 16 | DPO 5 | — | W37 | — | 0.5 | OEM-C-11 | — | — | — |
| 17 | DPO 6 | — | W38 | — | 0.5 | OEM-B-23 | — | — | — |
| 18 | +12V switched input | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 19 | HBO 1 | — | W35 | — | 0.5 | OEM-B-12 | — | — | — |
| 2 | Injector 2 | — | W27 | — | 0.5 | OEM-B-3 | — | — | — |
| 20 | HBO 2 | — | W43 | — | 0.5 | OEM-A-3 | — | — | — |
| 21 | HBO 3 | — | W44 | — | 0.5 | OEM-A-4 | — | — | — |
| 22 | HBO 4 | — | W45 | — | 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 | — | W30 | — | 0.5 | OEM-A-15 | — | — | — |
| 27 | Ignition 1 | — | W22 | — | 0.5 | OEM-C-4 | — | — | — |
| 28 | Ignition 2 | — | W23 | — | 0.5 | OEM-C-12 | — | — | — |
| 29 | Ignition 3 | — | W24 | — | 0.5 | OEM-C-13 | — | — | — |
| 3 | Injector 3 | — | W28 | — | 0.5 | OEM-B-4 | — | — | — |
| 30 | Ignition 4 | — | W25 | — | 0.5 | OEM-C-14 | — | — | — |
| 31 | Ignition 5 | — | — | — | — | — | — | — | — |
| 32 | Ignition 6 | — | — | — | — | — | — | — | — |
| 33 | Ignition 7 | — | — | — | — | — | — | — | — |
| 34 | Ignition 8 | — | — | — | — | — | — | — | — |
| 4 | Injector 4 | — | W29 | — | 0.5 | OEM-B-5 | — | — | — |
| 5 | Injector 5 | — | W39 | — | 0.5 | OEM-A-1 | — | — | — |
| 6 | Injector 6 | — | W40 | — | 0.5 | OEM-A-12 | — | — | — |
| 7 | Injector 7 | — | W41 | — | 0.5 | OEM-A-18 | — | — | — |
| 8 | Injector 8 | — | W42 | — | 0.5 | OEM-A-2 | — | — | — |
| 9 | DPO 1 | — | W31 | — | 0.5 | OEM-A-16 | — | — | — |
NEXUSS3-C
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Trigger + | — | W18 | — | 0.5 | OEM-C-8 | — | — | — |
| 10 | AVI 1 | — | W46 | — | 0.5 | OEM-C-17 | — | — | — |
| 11 | AVI 2 | — | W47 | — | 0.5 | OEM-C-27 | — | — | — |
| 12 | AVI 3 | — | W48 | — | 0.5 | OEM-A-23 | — | — | — |
| 13 | AVI 4 | — | W49 | — | 0.5 | OEM-C-15 | — | — | — |
| 14 | AVI 5 | — | W50 | — | 0.5 | OEM-C-16 | — | — | — |
| 15 | AVI 6 | — | W51 | — | 0.5 | OEM-C-26 | — | — | — |
| 16 | AVI 7 | — | W52 | — | 0.5 | OEM-C-25 | — | — | — |
| 17 | AVI 8 | — | W53 | — | 0.5 | OEM-A-29 | — | — | — |
| 18 | AVI 9 | — | W54 | — | 0.5 | OEM-A-30 | — | — | — |
| 19 | SPI 5 | — | W59 | — | 0.5 | OEM-A-26 | — | — | — |
| 2 | Trigger - | — | W17 | — | 0.5 | OEM-C-9 | — | — | — |
| 20 | SPI 6 | — | W60 | — | 0.5 | OEM-A-27 | — | — | — |
| 21 | CAN 2 High | — | — | — | — | — | — | — | — |
| 22 | CAN 2 Low | — | — | — | — | — | — | — | — |
| 23 | Knock 1 | — | — | — | — | — | — | — | — |
| 24 | Knock 2 | — | — | — | — | — | — | — | — |
| 25 | +5V | — | W16 | — | 0.5 | OEM-C-19 | — | — | — |
| 26 | Signal ground | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 27 | AVI 10 | — | W55 | — | 0.5 | OEM-C-24 | — | — | — |
| 28 | AVI 11 | — | W61 | — | 0.5 | OEM-A-32 | — | — | — |
| 29 | WBI 1 Heater + | — | — | — | — | — | — | — | — |
| 3 | Home + | — | W20 | — | 0.5 | OEM-C-20 | — | — | — |
| 30 | WBI 1 Input | — | — | — | — | — | — | — | — |
| 31 | WBI 1 Pump | — | — | — | — | — | — | — | — |
| 32 | WBI 1 Nernst | — | — | — | — | — | — | — | — |
| 33 | WBI 1 Heater - | — | W36 | — | 0.5 | OEM-C-1 | — | — | — |
| 34 | WBI 1 Cal | — | — | — | — | — | — | — | — |
| 4 | Home - | — | W19 | — | 0.5 | OEM-C-21 | — | — | — |
| 5 | SPI 1 | — | W21 | — | 0.5 | OEM-C-29 | — | — | — |
| 6 | SPI 2 | — | W56 | — | 0.5 | OEM-A-9 | — | — | — |
| 7 | SPI 3 | — | W57 | — | 0.5 | OEM-C-5 | — | — | — |
| 8 | SPI 4 | — | W58 | — | 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 | — | W39 | — | 0.5 | NEXUSS3-A-5 | — | — | — |
| 2 | Air control valve solenoid | — | W42 | — | 0.5 | NEXUSS3-A-8 | — | — | — |
| 3 | Evap bypass solenoid | — | W43 | — | 0.5 | NEXUSS3-A-20 | — | — | — |
| 4 | Evap canister vent shut valve | — | W44 | — | 0.5 | NEXUSS3-A-21 | — | — | — |
| 5 | NC | — | — | — | — | — | — | — | — |
| 6 | Evap canister purge valve | — | W45 | — | 0.5 | NEXUSS3-A-22 | — | — | — |
| 7 | NC | — | — | — | — | — | — | — | — |
| 8 | NC | — | — | — | — | — | — | — | — |
| 9 | Vehicle speed sensor | — | W56 | — | 0.5 | NEXUSS3-C-6 | — | — | — |
| 10 | Service check signal | — | — | — | — | — | — | — | — |
| 11 | NC | — | — | — | — | — | — | — | — |
| 12 | Immobilizer indicator light | — | W40 | — | 0.5 | NEXUSS3-A-6 | — | — | — |
| 13 | Immobilizer enable signal | — | — | — | — | — | — | — | — |
| 14 | NC | — | — | — | — | — | — | — | — |
| 15 | Fuel pump relay (USDM) | — | W30 | — | 0.5 | NEXUSS3-A-26 | — | — | — |
| 16 | Fuel pump relay (JDM) | — | W31 | — | 0.5 | NEXUSS3-A-9 | — | — | — |
| 17 | A/C clutch relay | — | W32 | — | 0.5 | NEXUSS3-A-12 | — | — | — |
| 18 | Check engine light (MIL) | — | W41 | — | 0.5 | NEXUSS3-A-7 | — | — | — |
| 19 | Tacho output | — | — | — | — | — | — | — | — |
| 20 | Radiator fan relay | — | W33 | — | 0.5 | NEXUSS3-A-14 | — | — | — |
| 21 | K-Line | — | — | — | — | — | — | — | — |
| 22 | NC | — | — | — | — | — | — | — | — |
| 23 | Secondary O2 sensor | — | W48 | — | 0.5 | NEXUSS3-C-12 | — | — | — |
| 24 | Starter switch signal | — | W58 | — | 0.5 | NEXUSS3-C-8 | — | — | — |
| 25 | Immobilizer code | — | — | — | — | — | — | — | — |
| 26 | Power steering load detect | — | W59 | — | 0.5 | NEXUSS3-C-19 | — | — | — |
| 27 | A/C switch (request) | — | W60 | — | 0.5 | NEXUSS3-C-20 | — | — | — |
| 28 | Air pump relay | — | W34 | — | 0.5 | NEXUSS3-A-15 | — | — | — |
| 29 | Fuel tank pressure sensor | — | W53 | — | 0.5 | NEXUSS3-C-17 | — | — | — |
| 30 | Electrical load detector | — | W54 | — | 0.5 | NEXUSS3-C-18 | — | — | — |
| 31 | NC | — | — | — | — | — | — | — | — |
| 32 | Brake switch | — | W61 | — | 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 | — | W27 | — | 0.5 | NEXUSS3-A-2 | — | — | — |
| 4 | Injector 3 | — | W28 | — | 0.5 | NEXUSS3-A-3 | — | — | — |
| 5 | Injector 4 | — | W29 | — | 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 | — | W26 | — | 0.5 | NEXUSS3-A-1 | — | — | — |
| 12 | VTEC solenoid | — | W35 | — | 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 | — | W38 | — | 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 | — | W36 | — | 0.5 | NEXUSS3-C-33 | — | — | — |
| 2 | Alternator control | — | — | — | — | — | — | — | — |
| 3 | Knock sensor | — | — | — | — | — | — | — | — |
| 4 | Ignition coil 1 | — | W22 | — | 0.5 | NEXUSS3-A-27 | — | — | — |
| 5 | Alternator FR signal | — | W57 | — | 0.5 | NEXUSS3-C-7 | — | — | — |
| 6 | NC | — | — | — | — | — | — | — | — |
| 7 | Sensor ground 1 | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 8 | Crank sensor + (CKP+) | — | W18 | — | 0.5 | NEXUSS3-C-1 | — | — | — |
| 9 | Crank sensor − (CKP−) | — | W17 | — | 0.5 | NEXUSS3-C-2 | — | — | — |
| 10 | VTEC pressure switch | — | — | — | — | — | — | — | — |
| 11 | Secondary O2 heater control | — | W37 | — | 0.5 | NEXUSS3-A-16 | — | — | — |
| 12 | Ignition coil 2 | — | W23 | — | 0.5 | NEXUSS3-A-28 | — | — | — |
| 13 | Ignition coil 3 | — | W24 | — | 0.5 | NEXUSS3-A-29 | — | — | — |
| 14 | Ignition coil 4 | — | W25 | — | 0.5 | NEXUSS3-A-30 | — | — | — |
| 15 | Secondary O2 sensor | — | W49 | — | 0.5 | NEXUSS3-C-13 | — | — | — |
| 16 | Primary O2 sensor | — | W50 | — | 0.5 | NEXUSS3-C-14 | — | — | — |
| 17 | MAP sensor | — | W46 | — | 0.5 | NEXUSS3-C-10 | — | — | — |
| 18 | Sensor ground 2 | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | Sensor 5V supply 1 (MAP) | — | W16 | — | 0.5 | NEXUSS3-C-25 | — | — | — |
| 20 | Cam (TDC1) sensor + | — | W20 | — | 0.5 | NEXUSS3-C-3 | — | — | — |
| 21 | Cam (TDC1) sensor − | — | W19 | — | 0.5 | NEXUSS3-C-4 | — | — | — |
| 22 | Knock sensor | — | — | — | — | — | — | — | — |
| 23 | NC | — | — | — | — | — | — | — | — |
| 24 | Air pump electric current sensor | — | W55 | — | 0.5 | NEXUSS3-C-27 | — | — | — |
| 25 | Intake air temp sensor | — | W52 | — | 0.5 | NEXUSS3-C-16 | — | — | — |
| 26 | Coolant temp sensor | — | W51 | — | 0.5 | NEXUSS3-C-15 | — | — | — |
| 27 | Throttle position sensor | — | W47 | — | 0.5 | NEXUSS3-C-11 | — | — | — |
| 28 | Sensor 5V supply 2 | — | — | — | — | — | — | — | — |
| 29 | Cam (TDC2) sensor + | — | W21 | — | 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 | — | — | W14 | — | 0.5 | OEM-C-7 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-C-18 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-C-30 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-C-31 | — | — | — |
| 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-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 | — | — | — | 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 | NEXUSS3-C-25 | 0.5 | no route | Sensor 5V supply 1 (MAP) | — | |
| W17 | OEM-C-9 | NEXUSS3-C-2 | 0.5 | no route | Crank sensor − (CKP−) | — | |
| W18 | OEM-C-8 | NEXUSS3-C-1 | 0.5 | no route | Crank sensor + (CKP+) | — | |
| W19 | OEM-C-21 | NEXUSS3-C-4 | 0.5 | no route | Cam (TDC1) sensor − | — | |
| W20 | OEM-C-20 | NEXUSS3-C-3 | 0.5 | no route | Cam (TDC1) sensor + | — | |
| W21 | OEM-C-29 | NEXUSS3-C-5 | 0.5 | no route | Cam (TDC2) sensor + | — | |
| W22 | OEM-C-4 | NEXUSS3-A-27 | 0.5 | no route | Ignition coil 1 | — | |
| W23 | OEM-C-12 | NEXUSS3-A-28 | 0.5 | no route | Ignition coil 2 | — | |
| W24 | OEM-C-13 | NEXUSS3-A-29 | 0.5 | no route | Ignition coil 3 | — | |
| W25 | OEM-C-14 | NEXUSS3-A-30 | 0.5 | no route | Ignition coil 4 | — | |
| W26 | OEM-B-11 | NEXUSS3-A-1 | 0.5 | no route | Injector 1 | — | |
| W27 | OEM-B-3 | NEXUSS3-A-2 | 0.5 | no route | Injector 2 | — | |
| W28 | OEM-B-4 | NEXUSS3-A-3 | 0.5 | no route | Injector 3 | — | |
| W29 | OEM-B-5 | NEXUSS3-A-4 | 0.5 | no route | Injector 4 | — | |
| W30 | OEM-A-15 | NEXUSS3-A-26 | 0.5 | no route | Fuel pump relay (USDM) | — | |
| W31 | OEM-A-16 | NEXUSS3-A-9 | 0.5 | no route | Fuel pump relay (JDM) | — | |
| W32 | OEM-A-17 | NEXUSS3-A-12 | 0.5 | no route | A/C clutch relay | — | |
| W33 | OEM-A-20 | NEXUSS3-A-14 | 0.5 | no route | Radiator fan relay | — | |
| W34 | OEM-A-28 | NEXUSS3-A-15 | 0.5 | no route | Air pump relay | — | |
| W35 | OEM-B-12 | NEXUSS3-A-19 | 0.5 | no route | VTEC solenoid | — | |
| W36 | OEM-C-1 | NEXUSS3-C-33 | 0.5 | no route | Primary O2 heater | — | |
| W37 | OEM-C-11 | NEXUSS3-A-16 | 0.5 | no route | Secondary O2 heater control | — | |
| W38 | OEM-B-23 | NEXUSS3-A-17 | 0.5 | no route | Idle air control valve | — | |
| W39 | OEM-A-1 | NEXUSS3-A-5 | 0.5 | no route | Coolant temp gauge drive | — | |
| W40 | OEM-A-12 | NEXUSS3-A-6 | 0.5 | no route | Immobilizer indicator light | — | |
| W41 | OEM-A-18 | NEXUSS3-A-7 | 0.5 | no route | Check engine light (MIL) | — | |
| W42 | OEM-A-2 | NEXUSS3-A-8 | 0.5 | no route | Air control valve solenoid | — | |
| W43 | OEM-A-3 | NEXUSS3-A-20 | 0.5 | no route | Evap bypass solenoid | — | |
| W44 | OEM-A-4 | NEXUSS3-A-21 | 0.5 | no route | Evap canister vent shut valve | — | |
| W45 | OEM-A-6 | NEXUSS3-A-22 | 0.5 | no route | Evap canister purge valve | — | |
| W46 | OEM-C-17 | NEXUSS3-C-10 | 0.5 | no route | MAP sensor | — | |
| W47 | OEM-C-27 | NEXUSS3-C-11 | 0.5 | no route | Throttle position sensor | — | |
| W48 | OEM-A-23 | NEXUSS3-C-12 | 0.5 | no route | Secondary O2 sensor | — | |
| W49 | OEM-C-15 | NEXUSS3-C-13 | 0.5 | no route | Secondary O2 sensor | — | |
| W50 | OEM-C-16 | NEXUSS3-C-14 | 0.5 | no route | Primary O2 sensor | — | |
| W51 | OEM-C-26 | NEXUSS3-C-15 | 0.5 | no route | Coolant temp sensor | — | |
| W52 | OEM-C-25 | NEXUSS3-C-16 | 0.5 | no route | Intake air temp sensor | — | |
| W53 | OEM-A-29 | NEXUSS3-C-17 | 0.5 | no route | Fuel tank pressure sensor | — | |
| W54 | OEM-A-30 | NEXUSS3-C-18 | 0.5 | no route | Electrical load detector | — | |
| W55 | OEM-C-24 | NEXUSS3-C-27 | 0.5 | no route | Air pump electric current sensor | — | |
| W56 | OEM-A-9 | NEXUSS3-C-6 | 0.5 | no route | Vehicle speed sensor | — | |
| W57 | OEM-C-5 | NEXUSS3-C-7 | 0.5 | no route | Alternator FR signal | — | |
| W58 | OEM-A-24 | NEXUSS3-C-8 | 0.5 | no route | Starter switch signal | — | |
| W59 | OEM-A-26 | NEXUSS3-C-19 | 0.5 | no route | Power steering load detect | — | |
| W60 | OEM-A-27 | NEXUSS3-C-20 | 0.5 | no route | A/C switch (request) | — | |
| W61 | 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 |
|---|---|---|---|
| error | REQUIRED_UNMAPPED | OEM-C-28 | Required OEM function "Sensor 5V supply 2" (vref) is not connected to the new ECU. |
| 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. |
| 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 2026-10-04. Review every wire against both manuals before building. Open items: - OEM-C 28: Sensor 5V supply 2: no free 5 V reference left on Haltech Nexus S3 for supply group "s2k_vcc2" (groups must stay separate) Not wired: - OEM-B 21: Backup power (battery constant): Haltech Nexus S3 has no battery-constant input; not needed - OEM-C 3: Knock sensor: 2 stock pins named "Knock sensor" without a documented polarity / pairing; wire by hand - OEM-C 22: 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 |
|---|---|---|---|
| 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 |
| 4 | vendor_doc | Haltech KB: F20C (AP1) engine | https://support.haltech.com/portal/en/kb/articles/f20c-ap1-engine |
| 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/ |
| 4 | vendor_doc | Haltech: Nexus S3/S2 ECU Overview (QSG) — specifications | https://store.haltech.com/product/ht-213000-nexus-s3-ecu-only/ |
| 4 | vendor_doc | Link S2000 AP1 PlugIn installation manual | https://linkecu.com/documentation/S2000X.pdf |
| 2 | forum | AllPinouts: 2000–2005 Honda S2000 ECU | https://allpinouts.org/pinouts/connectors/car/2000-2005-honda-s2000-ecu/ |
| 2 | forum | Autodata blog: ECU Pinout Honda S2000 2000-2004 | http://autodatas.blogspot.com/2012/11/ecu-pinout-honda-s2000-2000-2004.html |
| 2 | derived | Typical load estimates (relay coil ~0.2 A, high-Z injector ~1.2 A, VVT solenoid ~1 A) | — |