RSX Type-S 2002-04 (K20A2) → Haltech Nexus S3 HT-213000 (auto)
RSX Type-S 2002-04 (K20A2) — 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 | — | W27 | — | 0.5 | OEM-B-5 | — | — | — |
| 10 | Battery ground | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| 11 | Battery ground | — | W11 | — | 0.85 | SP-GND-1 | — | — | — |
| 12 | DPO 2 | — | W34 | — | 0.5 | OEM-E-1 | — | — | — |
| 13 | Ignition switch input | — | W31 | — | 0.5 | OEM-E-9 | — | — | — |
| 14 | DPO 3 | — | W35 | — | 0.5 | OEM-E-18 | — | — | — |
| 15 | DPO 4 | — | W36 | — | 0.5 | OEM-E-8 | — | — | — |
| 16 | DPO 5 | — | W38 | — | 0.5 | OEM-A-1 | — | — | — |
| 17 | DPO 6 | — | W39 | — | 0.5 | OEM-A-12 | — | — | — |
| 18 | +12V switched input | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 19 | HBO 1 | — | W44 | — | 0.5 | OEM-B-23 | — | — | — |
| 2 | Injector 2 | — | W28 | — | 0.5 | OEM-B-4 | — | — | — |
| 20 | HBO 2 | — | W45 | — | 0.5 | OEM-B-7 | — | — | — |
| 21 | HBO 3 | — | W46 | — | 0.5 | OEM-E-21 | — | — | — |
| 22 | HBO 4 | — | W47 | — | 0.5 | OEM-E-31 | — | — | — |
| 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-E-7 | — | — | — |
| 27 | Ignition 1 | — | W23 | — | 0.5 | OEM-A-30 | — | — | — |
| 28 | Ignition 2 | — | W24 | — | 0.5 | OEM-A-29 | — | — | — |
| 29 | Ignition 3 | — | W25 | — | 0.5 | OEM-A-28 | — | — | — |
| 3 | Injector 3 | — | W29 | — | 0.5 | OEM-B-3 | — | — | — |
| 30 | Ignition 4 | — | W26 | — | 0.5 | OEM-A-27 | — | — | — |
| 31 | Ignition 5 | — | — | — | — | — | — | — | — |
| 32 | Ignition 6 | — | — | — | — | — | — | — | — |
| 33 | Ignition 7 | — | — | — | — | — | — | — | — |
| 34 | Ignition 8 | — | — | — | — | — | — | — | — |
| 4 | Injector 4 | — | W30 | — | 0.5 | OEM-B-2 | — | — | — |
| 5 | Injector 5 | — | W40 | — | 0.5 | OEM-B-15 | — | — | — |
| 6 | Injector 6 | — | W41 | — | 0.5 | OEM-B-1 | — | — | — |
| 7 | Injector 7 | — | W42 | — | 0.5 | OEM-B-18 | — | — | — |
| 8 | Injector 8 | — | W43 | — | 0.5 | OEM-B-21 | — | — | — |
| 9 | DPO 1 | — | W33 | — | 0.5 | OEM-B-6 | — | — | — |
NEXUSS3-C
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Trigger + | — | W17 | — | 0.5 | OEM-A-7 | — | — | — |
| 10 | AVI 1 | — | W51 | — | 0.5 | OEM-A-19 | — | — | — |
| 11 | AVI 2 | — | W52 | — | 0.5 | OEM-A-15 | — | — | — |
| 12 | AVI 3 | — | W53 | — | 0.5 | OEM-E-2 | — | — | — |
| 13 | AVI 4 | — | W54 | — | 0.5 | OEM-B-8 | — | — | — |
| 14 | AVI 5 | — | W55 | — | 0.5 | OEM-B-17 | — | — | — |
| 15 | AVI 6 | — | W56 | — | 0.5 | OEM-B-13 | — | — | — |
| 16 | AVI 7 | — | W57 | — | 0.5 | OEM-E-14 | — | — | — |
| 17 | AVI 8 | — | W58 | — | 0.5 | OEM-E-15 | — | — | — |
| 18 | AVI 9 | — | W64 | — | 0.5 | OEM-E-22 | — | — | — |
| 19 | SPI 5 | — | W62 | — | 0.5 | OEM-E-16 | — | — | — |
| 2 | Trigger - | — | W18 | — | 0.5 | SP-0V-1 | — | — | — |
| 20 | SPI 6 | — | W63 | — | 0.5 | OEM-E-20 | — | — | — |
| 21 | CAN 2 High | — | — | — | — | — | — | — | — |
| 22 | CAN 2 Low | — | — | — | — | — | — | — | — |
| 23 | Knock 1 | — | W22 | — | 0.5 | OEM-A-9 | — | — | — |
| 24 | Knock 2 | — | — | — | — | — | — | — | — |
| 25 | +5V | — | W16 | — | 0.5 | OEM-A-20 | — | — | — |
| 26 | Signal ground | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 27 | AVI 10 | — | — | — | — | — | — | — | — |
| 28 | AVI 11 | — | — | — | — | — | — | — | — |
| 29 | WBI 1 Heater + | — | W50 | — | 0.5 | OEM-A-22 | — | — | — |
| 3 | Home + | — | W19 | — | 0.5 | OEM-A-25 | — | — | — |
| 30 | WBI 1 Input | — | — | — | — | — | — | — | — |
| 31 | WBI 1 Pump | — | W48 | — | 0.5 | OEM-A-6 | — | — | — |
| 32 | WBI 1 Nernst | — | W49 | — | 0.5 | OEM-A-16 | — | — | — |
| 33 | WBI 1 Heater - | — | W37 | — | 0.5 | OEM-E-6 | — | — | — |
| 34 | WBI 1 Cal | — | — | — | — | — | — | — | — |
| 4 | Home - | — | W20 | — | 0.5 | SP-0V-1 | — | — | — |
| 5 | SPI 1 | — | W21 | — | 0.5 | OEM-A-26 | — | — | — |
| 6 | SPI 2 | — | W59 | — | 0.5 | OEM-A-18 | — | — | — |
| 7 | SPI 3 | — | W60 | — | 0.5 | OEM-B-10 | — | — | — |
| 8 | SPI 4 | — | W61 | — | 0.5 | OEM-B-9 | — | — | — |
| 9 | +8V | — | — | — | — | — | — | — | — |
OEM-A
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | A/F sensor heater control (AFSHTC) | — | W38 | — | 0.5 | NEXUSS3-A-16 | — | — | — |
| 2 | Ignition power 2 (IGP2) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 3 | Ignition power 1 (IGP1) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 4 | Power ground 2 (PG2) | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 5 | Power ground 1 (PG1) | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 6 | A/F sensor + (AFS+, wideband Ip) | — | W48 | — | 0.5 | NEXUSS3-C-31 | — | — | — |
| 7 | Crank position sensor (CKP) | — | W17 | — | 0.5 | NEXUSS3-C-1 | — | — | — |
| 8 | — | — | — | — | — | — | — | — | — |
| 9 | Knock sensor (KS) | — | W22 | — | 0.5 | NEXUSS3-C-23 | — | — | — |
| 10 | Sensor ground 2 (SG2) | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 11 | Sensor ground 1 (SG1) | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 12 | Idle air control valve (IACV) | — | W39 | — | 0.5 | NEXUSS3-A-17 | — | — | — |
| 13 | — | — | — | — | — | — | — | — | — |
| 14 | — | — | — | — | — | — | — | — | — |
| 15 | Throttle position sensor (TPS) | — | W52 | — | 0.5 | NEXUSS3-C-11 | — | — | — |
| 16 | A/F sensor - (AFS-, wideband Vs) | — | W49 | — | 0.5 | NEXUSS3-C-32 | — | — | — |
| 17 | — | — | — | — | — | — | — | — | — |
| 18 | Vehicle speed sensor (VSS, M/T) | — | W59 | — | 0.5 | NEXUSS3-C-6 | — | — | — |
| 19 | Manifold absolute pressure (MAP) | — | W51 | — | 0.5 | NEXUSS3-C-10 | — | — | — |
| 20 | Sensor 5V supply 2 (VCC2) | — | W16 | — | 0.5 | NEXUSS3-C-25 | — | — | — |
| 21 | Sensor 5V supply 1 (VCC1) | — | — | — | — | — | — | — | — |
| 22 | A/F sensor heater supply (AFSHTC+) | — | W50 | — | 0.5 | NEXUSS3-C-29 | — | — | — |
| 23 | Logic ground 2 (LG2) | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 24 | Logic ground 1 (LG1) | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 25 | Camshaft position A (CMP A) | — | W19 | — | 0.5 | NEXUSS3-C-3 | — | — | — |
| 26 | Camshaft position B (CMP B) | — | W21 | — | 0.5 | NEXUSS3-C-5 | — | — | — |
| 27 | Ignition coil 4 (IGPLS4) | — | W26 | — | 0.5 | NEXUSS3-A-30 | — | — | — |
| 28 | Ignition coil 3 (IGPLS3) | — | W25 | — | 0.5 | NEXUSS3-A-29 | — | — | — |
| 29 | Ignition coil 2 (IGPLS2) | — | W24 | — | 0.5 | NEXUSS3-A-28 | — | — | — |
| 30 | Ignition coil 1 (IGPLS1) | — | W23 | — | 0.5 | NEXUSS3-A-27 | — | — | — |
| 31 | — | — | — | — | — | — | — | — | — |
OEM-B
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | VTC oil control solenoid (+) | — | W41 | — | 0.5 | NEXUSS3-A-6 | — | — | — |
| 2 | Injector 4 (INJ4) | — | W30 | — | 0.5 | NEXUSS3-A-4 | — | — | — |
| 3 | Injector 3 (INJ3) | — | W29 | — | 0.5 | NEXUSS3-A-3 | — | — | — |
| 4 | Injector 2 (INJ2) | — | W28 | — | 0.5 | NEXUSS3-A-2 | — | — | — |
| 5 | Injector 1 (INJ1) | — | W27 | — | 0.5 | NEXUSS3-A-1 | — | — | — |
| 6 | Radiator fan control (FANC) | — | W33 | — | 0.5 | NEXUSS3-A-9 | — | — | — |
| 7 | Reverse lockout solenoid (RVS, Type-S) | — | W45 | — | 0.5 | NEXUSS3-A-20 | — | — | — |
| 8 | Coolant temp sensor (ECT) | — | W54 | — | 0.5 | NEXUSS3-C-13 | — | — | — |
| 9 | VTEC oil pressure switch (VTPSW) | — | W61 | — | 0.5 | NEXUSS3-C-8 | — | — | — |
| 10 | Alternator L signal (ALTL) | — | W60 | — | 0.5 | NEXUSS3-C-7 | — | — | — |
| 11 | — | — | — | — | — | — | — | — | — |
| 12 | — | — | — | — | — | — | — | — | — |
| 13 | Alternator FR signal (ALTF) | — | W56 | — | 0.5 | NEXUSS3-C-15 | — | — | — |
| 14 | — | — | — | — | — | — | — | — | — |
| 15 | VTEC solenoid (VTS) | — | W40 | — | 0.5 | NEXUSS3-A-5 | — | — | — |
| 16 | — | — | — | — | — | — | — | — | — |
| 17 | Intake air temp sensor (IAT) | — | W55 | — | 0.5 | NEXUSS3-C-14 | — | — | — |
| 18 | Alternator control (ALTC) | — | W42 | — | 0.5 | NEXUSS3-A-7 | — | — | — |
| 19 | — | — | — | — | — | — | — | — | — |
| 20 | — | — | — | — | — | — | — | — | — |
| 21 | Evap canister purge valve (PCS) | — | W43 | — | 0.5 | NEXUSS3-A-8 | — | — | — |
| 22 | — | — | — | — | — | — | — | — | — |
| 23 | VTC oil control solenoid (-) | — | W44 | — | 0.5 | NEXUSS3-A-19 | — | — | — |
| 24 | — | — | — | — | — | — | — | — | — |
OEM-E
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Immobilizer fuel pump relay (IMO FPR) | — | W34 | — | 0.5 | NEXUSS3-A-12 | — | — | — |
| 2 | Secondary heated O2 sensor (SHO2S) | — | W53 | — | 0.5 | NEXUSS3-C-12 | — | — | — |
| 3 | Logic ground 3 (LG3) | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 4 | Sensor ground 3 (SG3) | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 5 | Sensor 5V supply 3 (VCC3) | — | — | — | — | — | — | — | — |
| 6 | Secondary O2 heater control (SO2SHTC) | — | W37 | — | 0.5 | NEXUSS3-C-33 | — | — | — |
| 7 | Main relay control (MRLY) | — | W32 | — | 0.5 | NEXUSS3-A-26 | — | — | — |
| 8 | A/F sensor heater relay control (AFSHTCR) | — | W36 | — | 0.5 | NEXUSS3-A-15 | — | — | — |
| 9 | Ignition switch signal (IG1) | — | W31 | — | 0.5 | NEXUSS3-A-13 | — | — | — |
| 10 | — | — | — | — | — | — | — | — | — |
| 11 | — | — | — | — | — | — | — | — | — |
| 12 | — | — | — | — | — | — | — | — | — |
| 13 | — | — | — | — | — | — | — | — | — |
| 14 | Fuel tank pressure sensor (FTP) | — | W57 | — | 0.5 | NEXUSS3-C-16 | — | — | — |
| 15 | Electrical load detector (ELD) | — | W58 | — | 0.5 | NEXUSS3-C-17 | — | — | — |
| 16 | Power steering pressure switch (PSPSW) | — | W62 | — | 0.5 | NEXUSS3-C-19 | — | — | — |
| 17 | — | — | — | — | — | — | — | — | — |
| 18 | A/C clutch relay (ACC) | — | W35 | — | 0.5 | NEXUSS3-A-14 | — | — | — |
| 19 | — | — | — | — | — | — | — | — | — |
| 20 | Brake switch / interlock (2WBS) | — | W63 | — | 0.5 | NEXUSS3-C-20 | — | — | — |
| 21 | Evap vent shut valve (VSV) | — | W46 | — | 0.5 | NEXUSS3-A-21 | — | — | — |
| 22 | Brake switch (BKSW) | — | W64 | — | 0.5 | NEXUSS3-C-18 | — | — | — |
| 23 | K-line (diagnostic) | — | — | — | — | — | — | — | — |
| 24 | Multiplex communication (SEFMJ) | — | — | — | — | — | — | — | — |
| 25 | — | — | — | — | — | — | — | — | — |
| 26 | Engine speed pulse / tacho (NEP) | — | — | — | — | — | — | — | — |
| 27 | Immobilizer code (IMOCD) | — | — | — | — | — | — | — | — |
| 28 | — | — | — | — | — | — | — | — | — |
| 29 | Service check signal (SCS) | — | — | — | — | — | — | — | — |
| 30 | Write enable signal (WEN) | — | — | — | — | — | — | — | — |
| 31 | Malfunction indicator lamp (MIL) | — | W47 | — | 0.5 | NEXUSS3-A-22 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W14 | — | 0.5 | OEM-E-4 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-A-10 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-A-11 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | NEXUSS3-C-26 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | NEXUSS3-C-2 | — | — | — |
| 1 | — | — | W20 | — | 0.5 | NEXUSS3-C-4 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-A-2 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-A-3 | — | — | — |
| 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-23 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-A-24 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-A-4 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | OEM-A-5 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | OEM-E-3 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | NEXUSS3-A-10 | — | — | — |
| 1 | — | — | W11 | — | 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 | A/F sensor heater control (AFSHTC) | low_side_out | NEXUSS3-A-16 | DPO 5 | low_side_out | single_source | |
| OEM-A-10 | Sensor ground 2 (SG2) | sensor_ground | NEXUSS3-C-2 + NEXUSS3-C-26 + NEXUSS3-C-4 | Trigger - + Signal ground + Home - | sensor_ground + trigger_in | corroborated | |
| OEM-A-11 | Sensor ground 1 (SG1) | sensor_ground | NEXUSS3-C-2 + NEXUSS3-C-26 + NEXUSS3-C-4 | Trigger - + Signal ground + Home - | sensor_ground + trigger_in | corroborated | |
| OEM-A-12 | Idle air control valve (IACV) | low_side_out | NEXUSS3-A-17 | DPO 6 | low_side_out | corroborated | |
| OEM-A-15 | Throttle position sensor (TPS) | analog_in | NEXUSS3-C-11 | AVI 2 | analog_in | corroborated | |
| OEM-A-16 | A/F sensor - (AFS-, wideband Vs) | wb_vs | NEXUSS3-C-32 | WBI 1 Nernst | wb_vs | single_source | |
| OEM-A-18 | Vehicle speed sensor (VSS, M/T) | digital_in | NEXUSS3-C-6 | SPI 2 | digital_in | corroborated | |
| OEM-A-19 | Manifold absolute pressure (MAP) | analog_in | NEXUSS3-C-10 | AVI 1 | analog_in | corroborated | |
| OEM-A-2 | Ignition power 2 (IGP2) | power_in | NEXUSS3-A-18 + NEXUSS3-A-25 | +12V switched input + +12V switched input | power_in | corroborated | |
| OEM-A-20 | Sensor 5V supply 2 (VCC2) | vref | NEXUSS3-C-25 | +5V | vref | corroborated | |
| OEM-A-21 | Sensor 5V supply 1 (VCC1) | vref | — | — | — | corroborated | |
| OEM-A-22 | A/F sensor heater supply (AFSHTC+) | power_out | NEXUSS3-C-29 | WBI 1 Heater + | power_out | single_source | |
| OEM-A-23 | Logic ground 2 (LG2) | ground | NEXUSS3-A-10 + NEXUSS3-A-11 | Battery ground + Battery ground | ground | corroborated | |
| OEM-A-24 | Logic ground 1 (LG1) | ground | NEXUSS3-A-10 + NEXUSS3-A-11 | Battery ground + Battery ground | ground | corroborated | |
| OEM-A-25 | Camshaft position A (CMP A) | trigger_in | NEXUSS3-C-3 | Home + | trigger_in | single_source | |
| OEM-A-26 | Camshaft position B (CMP B) | trigger_in | NEXUSS3-C-5 | SPI 1 | digital_in | single_source | |
| OEM-A-27 | Ignition coil 4 (IGPLS4) | ignition_out | NEXUSS3-A-30 | Ignition 4 | ignition_out | corroborated | |
| OEM-A-28 | Ignition coil 3 (IGPLS3) | ignition_out | NEXUSS3-A-29 | Ignition 3 | ignition_out | corroborated | |
| OEM-A-29 | Ignition coil 2 (IGPLS2) | ignition_out | NEXUSS3-A-28 | Ignition 2 | ignition_out | corroborated | |
| OEM-A-3 | Ignition power 1 (IGP1) | power_in | NEXUSS3-A-18 + NEXUSS3-A-25 | +12V switched input + +12V switched input | power_in | corroborated | |
| OEM-A-30 | Ignition coil 1 (IGPLS1) | ignition_out | NEXUSS3-A-27 | Ignition 1 | ignition_out | corroborated | |
| OEM-A-4 | Power ground 2 (PG2) | ground | NEXUSS3-A-10 + NEXUSS3-A-11 | Battery ground + Battery ground | ground | corroborated | |
| OEM-A-5 | Power ground 1 (PG1) | ground | NEXUSS3-A-10 + NEXUSS3-A-11 | Battery ground + Battery ground | ground | corroborated | |
| OEM-A-6 | A/F sensor + (AFS+, wideband Ip) | wb_ip | NEXUSS3-C-31 | WBI 1 Pump | wb_ip | single_source | |
| OEM-A-7 | Crank position sensor (CKP) | trigger_in | NEXUSS3-C-1 | Trigger + | trigger_in | corroborated | |
| OEM-A-9 | Knock sensor (KS) | knock_in | NEXUSS3-C-23 | Knock 1 | knock_in | corroborated | |
| OEM-B-1 | VTC oil control solenoid (+) | low_side_out | NEXUSS3-A-6 | Injector 6 | injector_out | corroborated | |
| OEM-B-10 | Alternator L signal (ALTL) | digital_in | NEXUSS3-C-7 | SPI 3 | digital_in | single_source | |
| OEM-B-13 | Alternator FR signal (ALTF) | analog_in | NEXUSS3-C-15 | AVI 6 | analog_in | single_source | |
| OEM-B-15 | VTEC solenoid (VTS) | low_side_out | NEXUSS3-A-5 | Injector 5 | injector_out | single_source | |
| OEM-B-17 | Intake air temp sensor (IAT) | temp_in | NEXUSS3-C-14 | AVI 5 | analog_in | corroborated | |
| OEM-B-18 | Alternator control (ALTC) | low_side_out | NEXUSS3-A-7 | Injector 7 | injector_out | corroborated | |
| OEM-B-2 | Injector 4 (INJ4) | injector_out | NEXUSS3-A-4 | Injector 4 | injector_out | corroborated | |
| OEM-B-21 | Evap canister purge valve (PCS) | low_side_out | NEXUSS3-A-8 | Injector 8 | injector_out | corroborated | |
| OEM-B-23 | VTC oil control solenoid (-) | low_side_out | NEXUSS3-A-19 | HBO 1 | hbridge_out | corroborated | |
| OEM-B-3 | Injector 3 (INJ3) | injector_out | NEXUSS3-A-3 | Injector 3 | injector_out | corroborated | |
| OEM-B-4 | Injector 2 (INJ2) | injector_out | NEXUSS3-A-2 | Injector 2 | injector_out | corroborated | |
| OEM-B-5 | Injector 1 (INJ1) | injector_out | NEXUSS3-A-1 | Injector 1 | injector_out | corroborated | |
| OEM-B-6 | Radiator fan control (FANC) | low_side_out | NEXUSS3-A-9 | DPO 1 | low_side_out | corroborated | |
| OEM-B-7 | Reverse lockout solenoid (RVS, Type-S) | low_side_out | NEXUSS3-A-20 | HBO 2 | hbridge_out | corroborated | |
| OEM-B-8 | Coolant temp sensor (ECT) | temp_in | NEXUSS3-C-13 | AVI 4 | analog_in | corroborated | |
| OEM-B-9 | VTEC oil pressure switch (VTPSW) | digital_in | NEXUSS3-C-8 | SPI 4 | digital_in | corroborated | |
| OEM-E-1 | Immobilizer fuel pump relay (IMO FPR) | low_side_out | NEXUSS3-A-12 | DPO 2 | low_side_out | corroborated | |
| OEM-E-14 | Fuel tank pressure sensor (FTP) | analog_in | NEXUSS3-C-16 | AVI 7 | analog_in | corroborated | |
| OEM-E-15 | Electrical load detector (ELD) | analog_in | NEXUSS3-C-17 | AVI 8 | analog_in | corroborated | |
| OEM-E-16 | Power steering pressure switch (PSPSW) | digital_in | NEXUSS3-C-19 | SPI 5 | digital_in | corroborated | |
| OEM-E-18 | A/C clutch relay (ACC) | low_side_out | NEXUSS3-A-14 | DPO 3 | low_side_out | corroborated | |
| OEM-E-2 | Secondary heated O2 sensor (SHO2S) | lambda_nb_in | NEXUSS3-C-12 | AVI 3 | analog_in | corroborated | |
| OEM-E-20 | Brake switch / interlock (2WBS) | digital_in | NEXUSS3-C-20 | SPI 6 | digital_in | single_source | |
| OEM-E-21 | Evap vent shut valve (VSV) | low_side_out | NEXUSS3-A-21 | HBO 3 | hbridge_out | corroborated | |
| OEM-E-22 | Brake switch (BKSW) | digital_in | NEXUSS3-C-18 | AVI 9 | analog_in | corroborated | |
| OEM-E-23 | K-line (diagnostic) | serial | — | — | — | single_source | |
| OEM-E-24 | Multiplex communication (SEFMJ) | serial | — | — | — | corroborated | |
| OEM-E-26 | Engine speed pulse / tacho (NEP) | tacho_out | — | — | — | corroborated | |
| OEM-E-27 | Immobilizer code (IMOCD) | — | — | — | — | single_source | |
| OEM-E-29 | Service check signal (SCS) | — | — | — | — | single_source | |
| OEM-E-3 | Logic ground 3 (LG3) | ground | NEXUSS3-A-10 + NEXUSS3-A-11 | Battery ground + Battery ground | ground | corroborated | |
| OEM-E-30 | Write enable signal (WEN) | — | — | — | — | single_source | |
| OEM-E-31 | Malfunction indicator lamp (MIL) | low_side_out | NEXUSS3-A-22 | HBO 4 | hbridge_out | corroborated | |
| OEM-E-4 | Sensor ground 3 (SG3) | sensor_ground | NEXUSS3-C-2 + NEXUSS3-C-26 + NEXUSS3-C-4 | Trigger - + Signal ground + Home - | sensor_ground + trigger_in | corroborated | |
| OEM-E-5 | Sensor 5V supply 3 (VCC3) | vref | — | — | — | corroborated | |
| OEM-E-6 | Secondary O2 heater control (SO2SHTC) | low_side_out | NEXUSS3-C-33 | WBI 1 Heater - | low_side_out | corroborated | |
| OEM-E-7 | Main relay control (MRLY) | low_side_out | NEXUSS3-A-26 | ECR output | low_side_out | corroborated | |
| OEM-E-8 | A/F sensor heater relay control (AFSHTCR) | low_side_out | NEXUSS3-A-15 | DPO 4 | low_side_out | corroborated | |
| OEM-E-9 | Ignition switch signal (IG1) | digital_in | NEXUSS3-A-13 | Ignition switch input | digital_in | corroborated |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-A-2 | SP-14V-1 | 0.85 | no route | Ignition power 2 (IGP2) | — | |
| W2 | OEM-A-3 | SP-14V-1 | 0.85 | no route | Ignition power 1 (IGP1) | — | |
| 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-23 | SP-GND-1 | 0.85 | no route | Logic ground 2 (LG2) | — | |
| W6 | OEM-A-24 | SP-GND-1 | 0.85 | no route | Logic ground 1 (LG1) | — | |
| W7 | OEM-A-4 | SP-GND-1 | 0.85 | no route | Power ground 2 (PG2) | — | |
| W8 | OEM-A-5 | SP-GND-1 | 0.85 | no route | Power ground 1 (PG1) | — | |
| W9 | OEM-E-3 | SP-GND-1 | 0.85 | no route | Logic ground 3 (LG3) | — | |
| W10 | SP-GND-1 | NEXUSS3-A-10 | 0.85 | no route | Battery ground | — | |
| W11 | SP-GND-1 | NEXUSS3-A-11 | 0.85 | no route | Battery ground | — | |
| W12 | OEM-A-10 | SP-0V-1 | 0.5 | no route | Sensor ground 2 (SG2) | — | |
| W13 | OEM-A-11 | SP-0V-1 | 0.5 | no route | Sensor ground 1 (SG1) | — | |
| W14 | OEM-E-4 | SP-0V-1 | 0.5 | no route | Sensor ground 3 (SG3) | — | |
| W15 | SP-0V-1 | NEXUSS3-C-26 | 0.5 | no route | Signal ground | — | |
| W16 | OEM-A-20 | NEXUSS3-C-25 | 0.5 | no route | Sensor 5V supply 2 (VCC2) | — | |
| W17 | OEM-A-7 | NEXUSS3-C-1 | 0.5 | no route | Crank position sensor (CKP) | — | |
| W18 | SP-0V-1 | NEXUSS3-C-2 | 0.5 | no route | Trigger - | — | |
| W19 | OEM-A-25 | NEXUSS3-C-3 | 0.5 | no route | Camshaft position A (CMP A) | — | |
| W20 | SP-0V-1 | NEXUSS3-C-4 | 0.5 | no route | Home - | — | |
| W21 | OEM-A-26 | NEXUSS3-C-5 | 0.5 | no route | Camshaft position B (CMP B) | — | |
| W22 | OEM-A-9 | NEXUSS3-C-23 | 0.5 | no route | Knock sensor (KS) | — | |
| W23 | OEM-A-30 | NEXUSS3-A-27 | 0.5 | no route | Ignition coil 1 (IGPLS1) | — | |
| W24 | OEM-A-29 | NEXUSS3-A-28 | 0.5 | no route | Ignition coil 2 (IGPLS2) | — | |
| W25 | OEM-A-28 | NEXUSS3-A-29 | 0.5 | no route | Ignition coil 3 (IGPLS3) | — | |
| W26 | OEM-A-27 | NEXUSS3-A-30 | 0.5 | no route | Ignition coil 4 (IGPLS4) | — | |
| W27 | OEM-B-5 | NEXUSS3-A-1 | 0.5 | no route | Injector 1 (INJ1) | — | |
| W28 | OEM-B-4 | NEXUSS3-A-2 | 0.5 | no route | Injector 2 (INJ2) | — | |
| W29 | OEM-B-3 | NEXUSS3-A-3 | 0.5 | no route | Injector 3 (INJ3) | — | |
| W30 | OEM-B-2 | NEXUSS3-A-4 | 0.5 | no route | Injector 4 (INJ4) | — | |
| W31 | OEM-E-9 | NEXUSS3-A-13 | 0.5 | no route | Ignition switch signal (IG1) | — | |
| W32 | OEM-E-7 | NEXUSS3-A-26 | 0.5 | no route | Main relay control (MRLY) | — | |
| W33 | OEM-B-6 | NEXUSS3-A-9 | 0.5 | no route | Radiator fan control (FANC) | — | |
| W34 | OEM-E-1 | NEXUSS3-A-12 | 0.5 | no route | Immobilizer fuel pump relay (IMO FPR) | — | |
| W35 | OEM-E-18 | NEXUSS3-A-14 | 0.5 | no route | A/C clutch relay (ACC) | — | |
| W36 | OEM-E-8 | NEXUSS3-A-15 | 0.5 | no route | A/F sensor heater relay control (AFSHTCR) | — | |
| W37 | OEM-E-6 | NEXUSS3-C-33 | 0.5 | no route | Secondary O2 heater control (SO2SHTC) | — | |
| W38 | OEM-A-1 | NEXUSS3-A-16 | 0.5 | no route | A/F sensor heater control (AFSHTC) | — | |
| W39 | OEM-A-12 | NEXUSS3-A-17 | 0.5 | no route | Idle air control valve (IACV) | — | |
| W40 | OEM-B-15 | NEXUSS3-A-5 | 0.5 | no route | VTEC solenoid (VTS) | — | |
| W41 | OEM-B-1 | NEXUSS3-A-6 | 0.5 | no route | VTC oil control solenoid (+) | — | |
| W42 | OEM-B-18 | NEXUSS3-A-7 | 0.5 | no route | Alternator control (ALTC) | — | |
| W43 | OEM-B-21 | NEXUSS3-A-8 | 0.5 | no route | Evap canister purge valve (PCS) | — | |
| W44 | OEM-B-23 | NEXUSS3-A-19 | 0.5 | no route | VTC oil control solenoid (-) | — | |
| W45 | OEM-B-7 | NEXUSS3-A-20 | 0.5 | no route | Reverse lockout solenoid (RVS, Type-S) | — | |
| W46 | OEM-E-21 | NEXUSS3-A-21 | 0.5 | no route | Evap vent shut valve (VSV) | — | |
| W47 | OEM-E-31 | NEXUSS3-A-22 | 0.5 | no route | Malfunction indicator lamp (MIL) | — | |
| W48 | OEM-A-6 | NEXUSS3-C-31 | 0.5 | no route | A/F sensor + (AFS+, wideband Ip) | — | |
| W49 | OEM-A-16 | NEXUSS3-C-32 | 0.5 | no route | A/F sensor - (AFS-, wideband Vs) | — | |
| W50 | OEM-A-22 | NEXUSS3-C-29 | 0.5 | no route | A/F sensor heater supply (AFSHTC+) | — | |
| W51 | OEM-A-19 | NEXUSS3-C-10 | 0.5 | no route | Manifold absolute pressure (MAP) | — | |
| W52 | OEM-A-15 | NEXUSS3-C-11 | 0.5 | no route | Throttle position sensor (TPS) | — | |
| W53 | OEM-E-2 | NEXUSS3-C-12 | 0.5 | no route | Secondary heated O2 sensor (SHO2S) | — | |
| W54 | OEM-B-8 | NEXUSS3-C-13 | 0.5 | no route | Coolant temp sensor (ECT) | — | |
| W55 | OEM-B-17 | NEXUSS3-C-14 | 0.5 | no route | Intake air temp sensor (IAT) | — | |
| W56 | OEM-B-13 | NEXUSS3-C-15 | 0.5 | no route | Alternator FR signal (ALTF) | — | |
| W57 | OEM-E-14 | NEXUSS3-C-16 | 0.5 | no route | Fuel tank pressure sensor (FTP) | — | |
| W58 | OEM-E-15 | NEXUSS3-C-17 | 0.5 | no route | Electrical load detector (ELD) | — | |
| W59 | OEM-A-18 | NEXUSS3-C-6 | 0.5 | no route | Vehicle speed sensor (VSS, M/T) | — | |
| W60 | OEM-B-10 | NEXUSS3-C-7 | 0.5 | no route | Alternator L signal (ALTL) | — | |
| W61 | OEM-B-9 | NEXUSS3-C-8 | 0.5 | no route | VTEC oil pressure switch (VTPSW) | — | |
| W62 | OEM-E-16 | NEXUSS3-C-19 | 0.5 | no route | Power steering pressure switch (PSPSW) | — | |
| W63 | OEM-E-20 | NEXUSS3-C-20 | 0.5 | no route | Brake switch / interlock (2WBS) | — | |
| W64 | OEM-E-22 | NEXUSS3-C-18 | 0.5 | no route | Brake switch (BKSW) | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| connector | 1318682-6 | TE | K-series ECU harness plug A (040-3 HD plug assy, 31P) | 1.000 | ea |
| connector | 353029-1 | TE | K-series ECU harness plug B (040 H/D-3 plug HSG assy, 24P) | 1.000 | ea |
| connector | 353826-1 | TE | K-series ECU harness plug E (040 HD 31P plug HSG assy-B, 31P) | 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 (19)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | REQUIRED_UNMAPPED | OEM-A-21 | Required OEM function "Sensor 5V supply 1 (VCC1)" (vref) is not connected to the new ECU. |
| warn | DATASET_GAP | RSX ECU A | 5 of 31 cavities on RSX ECU A have no pin data (8,13,14,17,31). Anything there is invisible to these checks. |
| warn | DATASET_GAP | RSX ECU B | 8 of 24 cavities on RSX ECU B have no pin data (11,12,14,16,19,20,22,24). Anything there is invisible to these checks. |
| warn | DATASET_GAP | RSX ECU E | 8 of 31 cavities on RSX ECU E have no pin data (10,11,12,13,17,19,25,28). Anything there is invisible to these checks. |
| warn | LOAD_UNKNOWN | NEXUSS3-A-26 | NEXUSS3-A-26 "ECR output" drives OEM-E-7 Main relay control (MRLY) (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | NET_FAMILY | OEM-A-26 ↔ NEXUSS3-C-5 | OEM-A-26 "Camshaft position B (CMP B)" [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 | NET_FAMILY | OEM-B-23 ↔ NEXUSS3-A-19 | OEM-B-23 "VTC oil control solenoid (-)" [low_side_out] is wired to NEXUSS3-A-19 "HBO 1" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-B-7 ↔ NEXUSS3-A-20 | OEM-B-7 "Reverse lockout solenoid (RVS, Type-S)" [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-E-21 ↔ NEXUSS3-A-21 | OEM-E-21 "Evap vent shut valve (VSV)" [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-E-22 ↔ NEXUSS3-C-18 | OEM-E-22 "Brake switch (BKSW)" [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-E-31 ↔ NEXUSS3-A-22 | OEM-E-31 "Malfunction indicator lamp (MIL)" [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. |
| info | NET_FAMILY | OEM-B-1 ↔ NEXUSS3-A-6 | OEM-B-1 "VTC oil control solenoid (+)" [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-B-15 ↔ NEXUSS3-A-5 | OEM-B-15 "VTEC solenoid (VTS)" [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-B-17 ↔ NEXUSS3-C-14 | OEM-B-17 "Intake air temp sensor (IAT)" [temp_in] is wired to NEXUSS3-C-14 "AVI 5" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-B-18 ↔ NEXUSS3-A-7 | OEM-B-18 "Alternator control (ALTC)" [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-21 ↔ NEXUSS3-A-8 | OEM-B-21 "Evap canister purge valve (PCS)" [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-B-8 ↔ NEXUSS3-C-13 | OEM-B-8 "Coolant temp sensor (ECT)" [temp_in] is wired to NEXUSS3-C-13 "AVI 4" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-E-4 ↔ NEXUSS3-C-4 | OEM-E-4 "Sensor ground 3 (SG3)" [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 | UNMAPPED | OEM | 7 optional OEM pins are not mapped: OEM-E-23 K-line (diagnostic); OEM-E-24 Multiplex communication (SEFMJ); OEM-E-26 Engine speed pulse / tacho (NEP); OEM-E-27 Immobilizer code (IMOCD); OEM-E-29 Service check signal (SCS); OEM-E-30 Write enable signal (WEN); OEM-E-5 Sensor 5V supply 3 (VCC3) |
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-A 21: Sensor 5V supply 1 (VCC1): no free 5 V reference left on Haltech Nexus S3 for supply group "k_vcc1" (groups must stay separate) - OEM-E 5: Sensor 5V supply 3 (VCC3): no free 5 V reference left on Haltech Nexus S3 for supply group "k_vcc3" (groups must stay separate) Not wired: - OEM-E 26: Engine speed pulse / tacho (NEP): no free tacho/frequency_out/low_side/ls_hs on Haltech Nexus S3 - OEM-E 23: K-line (diagnostic): no free k_line on Haltech Nexus S3 - OEM-E 24: Multiplex communication (SEFMJ): no free k_line on Haltech Nexus S3 - OEM-E 27: Immobilizer code (IMOCD): not classified in the library; wire by hand - OEM-E 29: Service check signal (SCS): not classified in the library; wire by hand - OEM-E 30: Write enable signal (WEN): not classified in the library; wire by hand
Sources
| Reliability | Kind | Title | URL |
|---|---|---|---|
| 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: CIVICLink K20X (HC20X) DC5 installation manual | https://linkecu.com/documentation/237-4000%20DC5.pdf |
| 3 | forum | FFS TechNet: K-series 02-06 RSX ECU pin diagram (Helm) | https://ff-squad.com/technet2/k-series-02-06-rsx-ecu-pin-diagram/ |