Honda NSX NA1 1991-2005 (C30A) → DTAFast T4 (auto)
Honda NSX NA1 1991-2005 (C30A) — DTAFast — T4
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-11
Before you start
Not confident with automotive wiring? Have a professional harness builder or tuner do it, or check your work before first power-up. A wiring mistake can damage the ECU, the engine or the car, or start a fire.
| Status | draft · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | 6: read the Findings page before cutting any wire |
| Size of the job | 65 wires · 14 connectors · 2 part lines |
| Tools | Crimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink |
| Order of work | 1. Check every part against the parts list. 2. Cut and label every wire (labels: Export → Wire labels). 3. Crimp and pin connector by connector, ticking the build checklist. 4. Run the bench test with nothing plugged in and the battery disconnected. 5. Only then connect the ECU and power up. |
Build checklist
Tick each box as you go. Continuity: meter from end to end, expect under 1 Ω.
| Wire | From | To | Gauge | Colour | Cut | Label | Crimp A | Crimp B | Pin A | Pin B | Continuity |
|---|---|---|---|---|---|---|---|---|---|---|---|
| W1 | OEM-A-25 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-C-1 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | T4-C1-31 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-D-1 | T4-C3-26 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-A-23 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-A-24 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-B-2 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | T4-C1-13 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | T4-C1-14 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-A-26 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-B-10 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-B-12 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-B-14 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-B-16 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-D-21 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-D-22 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | SP-0V-1 | T4-C2-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | SP-0V-1 | T4-C2-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-D-18 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-D-19 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-D-20 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | SP-5V1-1 | T4-C2-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-B-15 | T4-C2-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-B-13 | T4-C2-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-B-11 | T4-C2-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-A-21 | T4-C1-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-A-22 | T4-C1-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-B-8 | T4-C1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-B-6 | T4-C1-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-A-1 | T4-C1-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-A-3 | T4-C1-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-A-5 | T4-C1-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-A-2 | T4-C1-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-A-4 | T4-C1-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-A-6 | T4-C1-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-D-17 | T4-C2-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-D-11 | T4-C2-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-D-13 | T4-C2-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-A-8 | T4-C1-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-A-15 | T4-C1-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-A-18 | T4-C1-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-A-7 | T4-C3-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-5-F5 | RLY1-R-OUT | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | SP-14V-1 | RLY1-R-IN | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | SP-14V-1 | RLY1-R-COIL+ | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | RLY1-R-COIL- | T4-C3-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-5-F7 | RLY2-R-OUT | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | SP-14V-1 | RLY2-R-IN | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | SP-14V-1 | RLY2-R-COIL+ | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | RLY2-R-COIL- | T4-C3-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W51 | OEM-A-10 | T4-C3-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W52 | OEM-A-12 | T4-C3-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W53 | OEM-A-11 | T4-C3-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W54 | OEM-D-14 | T4-C2-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W55 | OEM-D-16 | T4-C2-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W56 | OEM-D-15 | T4-C2-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W57 | OEM-D-12 | T4-C2-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W58 | OEM-C-2 | T4-C2-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W59 | OEM-D-9 | T4-C2-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W60 | OEM-5-F2 | T4-C2-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W61 | OEM-5-F4 | T4-C3-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W62 | OEM-B-7 | T4-C3-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W63 | OEM-C-11 | T4-C2-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W64 | OEM-C-3 | T4-C2-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W65 | OEM-C-5 | T4-C2-16 | 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 | RLY1-R-COIL+ | T4-C2-21 | open (OL) | +12 V supply must not touch sensor ground | |
| 2 | RLY1-R-COIL+ | T4-C2-24 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 3 | T4-C1-13 | RLY1-R-COIL+ | open (OL) | power ground must not touch +12 V supply | |
| 4 | T4-C1-13 | RLY1-R-OUT | open (OL) | power ground must not touch +12 V supply | |
| 5 | T4-C1-13 | RLY2-R-OUT | open (OL) | power ground must not touch +12 V supply | |
| 6 | T4-C1-13 | T4-C2-24 | open (OL) | power ground must not touch 5 V sensor reference | |
| 7 | T4-C1-13 | T4-C3-26 | open (OL) | power ground must not touch +12 V supply | |
| 8 | T4-C2-21 | RLY1-R-OUT | open (OL) | sensor ground must not touch +12 V supply | |
| 9 | T4-C2-21 | RLY2-R-OUT | open (OL) | sensor ground must not touch +12 V supply | |
| 10 | T4-C2-21 | T4-C2-24 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 11 | T4-C2-21 | T4-C3-26 | open (OL) | sensor ground must not touch +12 V supply | |
| 12 | T4-C2-24 | RLY1-R-OUT | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 13 | T4-C2-24 | RLY2-R-OUT | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 14 | T4-C3-26 | T4-C2-24 | open (OL) | +12 V supply must not touch 5 V sensor reference |
If any reading doesn't match, stop and get help before powering up.
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
OEM-5
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| F2 | Front VTEC pressure switch | — | W60 | — | 0.5 | T4-C2-15 | — | — | — |
| F4 | Rear VTEC pressure switch | — | W61 | — | 0.5 | T4-C3-17 | — | — | — |
| F5 | Front VTEC solenoid valve | — | W43 | — | 0.5 | RLY1-R-OUT | — | — | — |
| F7 | Rear VTEC solenoid valve | — | W47 | — | 0.5 | RLY2-R-OUT | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injector 1 | — | W30 | — | 0.5 | T4-C1-9 | — | — | — |
| 10 | Front O2 sensor heater (HTCNTF) | — | W51 | — | 0.5 | T4-C3-9 | — | — | — |
| 11 | EGR control solenoid | — | W53 | — | 0.5 | T4-C3-10 | — | — | — |
| 12 | Rear O2 sensor heater (HTCNTR) | — | W52 | — | 0.5 | T4-C3-25 | — | — | — |
| 13 | Check engine light (WARN) | — | — | — | — | — | — | — | — |
| 14 | Chamber volume control solenoid (BPS) | — | — | — | — | — | — | — | — |
| 15 | A/C clutch relay (ACC) | — | W40 | — | 0.5 | T4-C1-4 | — | — | — |
| 18 | Radiator fan control (FANCNTR) | — | W41 | — | 0.5 | T4-C1-3 | — | — | — |
| 2 | Injector 4 | — | W33 | — | 0.5 | T4-C1-25 | — | — | — |
| 20 | EVAP purge cut-off solenoid (PGS) | — | — | — | — | — | — | — | — |
| 21 | Ignition coil 1 | — | W26 | — | 0.5 | T4-C1-10 | — | — | — |
| 22 | Ignition coil 2 | — | W27 | — | 0.5 | T4-C1-18 | — | — | — |
| 23 | Power ground (PG1) | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 24 | Power ground (PG2) | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 25 | ECU power (IGP1) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 26 | Sensor ground (LG1) | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 3 | Injector 2 | — | W31 | — | 0.5 | T4-C1-17 | — | — | — |
| 4 | Injector 5 | — | W34 | — | 0.5 | T4-C1-9 | — | — | — |
| 5 | Injector 3 | — | W32 | — | 0.5 | T4-C1-34 | — | — | — |
| 6 | Injector 6 | — | W35 | — | 0.5 | T4-C1-17 | — | — | — |
| 7 | Main relay | — | W42 | — | 0.5 | T4-C3-22 | — | — | — |
| 8 | Fuel pump relay 2 (FLR2) | — | W39 | — | 0.5 | T4-C1-5 | — | — | — |
| 9 | Idle air control valve (IACV) | — | — | — | — | — | — | — | — |
OEM-B
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 10 | CYL 2M — CYP sensor 2 return | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 11 | CYL 1P — CYP sensor 1 signal | — | W25 | — | 0.5 | T4-C2-22 | — | — | — |
| 12 | CYL 1M — CYP sensor 1 return | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 13 | CRNK 2P — TDC sensor signal | — | W24 | — | 0.5 | T4-C2-2 | — | — | — |
| 14 | CRNK 2M — TDC sensor return | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 15 | CRNK 1P — crank sensor signal | — | W23 | — | 0.5 | T4-C2-12 | — | — | — |
| 16 | CRNK 1M — crank sensor return | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 2 | Chassis ground (LG2) | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 3 | Ignition coil 6 | — | — | — | — | — | — | — | — |
| 4 | Ignition coil 5 | — | — | — | — | — | — | — | — |
| 6 | Ignition coil 4 | — | W29 | — | 0.5 | T4-C1-26 | — | — | — |
| 7 | Neutral switch (M/T) / gear position (A/T) | — | W62 | — | 0.5 | T4-C3-18 | — | — | — |
| 8 | Ignition coil 3 | — | W28 | — | 0.5 | T4-C1-1 | — | — | — |
| 9 | CYL 2P — CYP sensor 2 signal | — | — | — | — | — | — | — | — |
OEM-C
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | ECU power (IGP2) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 10 | Traction control | — | — | — | — | — | — | — | — |
| 11 | Starter switch (STS) | — | W63 | — | 0.5 | T4-C2-34 | — | — | — |
| 12 | Traction control | — | — | — | — | — | — | — | — |
| 2 | Vehicle speed sensor (VSS) | — | W58 | — | 0.5 | T4-C2-4 | — | — | — |
| 3 | A/C switch (ACS) | — | W64 | — | 0.5 | T4-C2-3 | — | — | — |
| 4 | Tachometer output (NEP) | — | — | — | — | — | — | — | — |
| 5 | A/C pressure switch (PDSW) | — | W65 | — | 0.5 | T4-C2-16 | — | — | — |
| 6 | Traction control | — | — | — | — | — | — | — | — |
| 7 | Clutch switch (M/T) | — | — | — | — | — | — | — | — |
| 8 | Traction control | — | — | — | — | — | — | — | — |
| 9 | Service check connector (SCS) | — | — | — | — | — | — | — | — |
OEM-D
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Battery backup (VBU) | — | W4 | — | 0.85 | T4-C3-26 | — | — | — |
| 11 | Throttle position sensor (TPS) | — | W37 | — | 0.5 | T4-C2-1 | — | — | — |
| 12 | EGR lift sensor (EGRL) | — | W57 | — | 0.5 | T4-C2-19 | — | — | — |
| 13 | Engine coolant temperature (ECT) | — | W38 | — | 0.5 | T4-C2-7 | — | — | — |
| 14 | Primary O2 sensor | — | W54 | — | 0.5 | T4-C2-5 | — | — | — |
| 15 | Intake air temperature (IAT) | — | W56 | — | 0.5 | T4-C2-25 | — | — | — |
| 16 | Secondary O2 sensor | — | W55 | — | 0.5 | T4-C2-6 | — | — | — |
| 17 | MAP sensor | — | W36 | — | 0.5 | T4-C2-10 | — | — | — |
| 18 | +5V sensor supply (VCC) | — | W19 | — | 0.5 | SP-5V1-1 | — | — | — |
| 19 | +5V sensor supply (VCC) | — | W20 | — | 0.5 | SP-5V1-1 | — | — | — |
| 20 | +5V sensor supply (VCC) | — | W21 | — | 0.5 | SP-5V1-1 | — | — | — |
| 21 | Sensor ground (SG) | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 22 | Sensor ground (SG) | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 3 | Knock sensor — rear | — | — | — | — | — | — | — | — |
| 4 | Knock sensor — front | — | — | — | — | — | — | — | — |
| 5 | Traction control | — | — | — | — | — | — | — | — |
| 6 | Fuel pump voltage monitor (VFP) | — | — | — | — | — | — | — | — |
| 8 | Ignition timing adjuster (IGADJ) | — | — | — | — | — | — | — | — |
| 9 | Alternator FR signal | — | W59 | — | 0.5 | T4-C2-14 | — | — | — |
RLY1-R
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| COIL+ | Relay coil positive (switched +12 V) | — | W45 | — | 0.5 | SP-14V-1 | — | — | — |
| COIL- | Relay coil negative (ECU low-side driver) | — | W46 | — | 0.5 | T4-C3-23 | — | — | — |
| IN | Relay contact input (switched +12 V) | — | W44 | — | 0.5 | SP-14V-1 | — | — | — |
| OUT | Relay contact output (switched +12 V to load) | — | W43 | — | 0.5 | OEM-5-F5 | — | — | — |
RLY2-R
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| COIL+ | Relay coil positive (switched +12 V) | — | W49 | — | 0.5 | SP-14V-1 | — | — | — |
| COIL- | Relay coil negative (ECU low-side driver) | — | W50 | — | 0.5 | T4-C3-24 | — | — | — |
| IN | Relay contact input (switched +12 V) | — | W48 | — | 0.5 | SP-14V-1 | — | — | — |
| OUT | Relay contact output (switched +12 V to load) | — | W47 | — | 0.5 | OEM-5-F7 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W10 | — | 0.5 | OEM-A-26 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-B-10 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-B-12 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-B-14 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | OEM-B-16 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | OEM-D-21 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | OEM-D-22 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | T4-C2-21 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | T4-C2-33 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-A-25 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-C-1 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | T4-C1-31 | — | — | — |
| 1 | — | — | W44 | — | 0.5 | RLY1-R-IN | — | — | — |
| 1 | — | — | W45 | — | 0.5 | RLY1-R-COIL+ | — | — | — |
| 1 | — | — | W48 | — | 0.5 | RLY2-R-IN | — | — | — |
| 1 | — | — | W49 | — | 0.5 | RLY2-R-COIL+ | — | — | — |
SP-5V1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W19 | — | 0.5 | OEM-D-18 | — | — | — |
| 1 | — | — | W20 | — | 0.5 | OEM-D-19 | — | — | — |
| 1 | — | — | W21 | — | 0.5 | OEM-D-20 | — | — | — |
| 1 | — | — | W22 | — | 0.5 | T4-C2-24 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W9 | — | 0.85 | T4-C1-14 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-A-23 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-A-24 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-B-2 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | T4-C1-13 | — | — | — |
T4-C1
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Coil 3 | — | W28 | — | 0.5 | OEM-B-8 | — | — | — |
| 2 | — | — | — | — | — | — | — | — | — |
| 3 | PWM 3 | — | W41 | — | 0.5 | OEM-A-18 | — | — | — |
| 4 | PWM 2 | — | W40 | — | 0.5 | OEM-A-15 | — | — | — |
| 5 | PWM 1 | — | W39 | — | 0.5 | OEM-A-8 | — | — | — |
| 6 | — | — | — | — | — | — | — | — | — |
| 7 | — | — | — | — | — | — | — | — | — |
| 8 | — | — | — | — | — | — | — | — | — |
| 9 | Injector 1 | — | W34 | — | 0.5 | OEM-A-4 | — | — | — |
| 9 | Injector 1 | — | W30 | — | 0.5 | OEM-A-1 | — | — | — |
| 10 | Coil 1 | — | W26 | — | 0.5 | OEM-A-21 | — | — | — |
| 11 | — | — | — | — | — | — | — | — | — |
| 12 | — | — | — | — | — | — | — | — | — |
| 13 | Power Ground 1 | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 14 | Power Ground 2 | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 15 | — | — | — | — | — | — | — | — | — |
| 16 | — | — | — | — | — | — | — | — | — |
| 17 | Injector 2 | — | W31 | — | 0.5 | OEM-A-3 | — | — | — |
| 17 | Injector 2 | — | W35 | — | 0.5 | OEM-A-6 | — | — | — |
| 18 | Coil 2 | — | W27 | — | 0.5 | OEM-A-22 | — | — | — |
| 19 | — | — | — | — | — | — | — | — | — |
| 20 | — | — | — | — | — | — | — | — | — |
| 21 | — | — | — | — | — | — | — | — | — |
| 22 | — | — | — | — | — | — | — | — | — |
| 23 | — | — | — | — | — | — | — | — | — |
| 24 | — | — | — | — | — | — | — | — | — |
| 25 | Injector 4 | — | W33 | — | 0.5 | OEM-A-2 | — | — | — |
| 26 | Coil 4 | — | W29 | — | 0.5 | OEM-B-6 | — | — | — |
| 27 | — | — | — | — | — | — | — | — | — |
| 28 | — | — | — | — | — | — | — | — | — |
| 29 | — | — | — | — | — | — | — | — | — |
| 30 | — | — | — | — | — | — | — | — | — |
| 31 | Ignition 12v In | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 32 | — | — | — | — | — | — | — | — | — |
| 33 | — | — | — | — | — | — | — | — | — |
| 34 | Injector 3 | — | W32 | — | 0.5 | OEM-A-5 | — | — | — |
T4-C2
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Analogue 2 | — | W37 | — | 0.5 | OEM-D-11 | — | — | — |
| 2 | Wheel 1 | — | W24 | — | 0.5 | OEM-B-13 | — | — | — |
| 3 | Analogue 10 | — | W64 | — | 0.5 | OEM-C-3 | — | — | — |
| 4 | Digital 1 | — | W58 | — | 0.5 | OEM-C-2 | — | — | — |
| 5 | Analogue 3 | — | W54 | — | 0.5 | OEM-D-14 | — | — | — |
| 6 | Analogue 4 | — | W55 | — | 0.5 | OEM-D-16 | — | — | — |
| 7 | Thermistor 1 | — | W38 | — | 0.5 | OEM-D-13 | — | — | — |
| 8 | — | — | — | — | — | — | — | — | — |
| 9 | 5v Output | — | — | — | — | — | — | — | — |
| 10 | Analogue 1 | — | W36 | — | 0.5 | OEM-D-17 | — | — | — |
| 11 | — | — | — | — | — | — | — | — | — |
| 12 | Crank | — | W23 | — | 0.5 | OEM-B-15 | — | — | — |
| 13 | — | — | — | — | — | — | — | — | — |
| 14 | Digital 4 | — | W59 | — | 0.5 | OEM-D-9 | — | — | — |
| 15 | Digital 5 | — | W60 | — | 0.5 | OEM-5-F2 | — | — | — |
| 16 | Analogue 11 | — | W65 | — | 0.5 | OEM-C-5 | — | — | — |
| 17 | Thermistor 3 | — | — | — | — | — | — | — | — |
| 18 | — | — | — | — | — | — | — | — | — |
| 19 | Analogue 6 | — | W57 | — | 0.5 | OEM-D-12 | — | — | — |
| 20 | — | — | — | — | — | — | — | — | — |
| 21 | Sensor Ground | — | W17 | — | 0.5 | SP-0V-1 | — | — | — |
| 22 | Cam 1 | — | W25 | — | 0.5 | OEM-B-11 | — | — | — |
| 23 | — | — | — | — | — | — | — | — | — |
| 24 | 5v Output | — | W22 | — | 0.5 | SP-5V1-1 | — | — | — |
| 25 | Thermistor 2 | — | W56 | — | 0.5 | OEM-D-15 | — | — | — |
| 26 | CAN High | — | — | — | — | — | — | — | — |
| 27 | — | — | — | — | — | — | — | — | — |
| 28 | CAN Low | — | — | — | — | — | — | — | — |
| 29 | — | — | — | — | — | — | — | — | — |
| 30 | — | — | — | — | — | — | — | — | — |
| 31 | — | — | — | — | — | — | — | — | — |
| 32 | — | — | — | — | — | — | — | — | — |
| 33 | Sensor Ground | — | W18 | — | 0.5 | SP-0V-1 | — | — | — |
| 34 | Analogue 9 | — | W63 | — | 0.5 | OEM-C-11 | — | — | — |
T4-C3
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | — | — | — | — | — | — | — |
| 2 | — | — | — | — | — | — | — | — | — |
| 3 | — | — | — | — | — | — | — | — | — |
| 4 | — | — | — | — | — | — | — | — | — |
| 5 | — | — | — | — | — | — | — | — | — |
| 6 | — | — | — | — | — | — | — | — | — |
| 7 | Lambda 1 Pump Current | — | — | — | — | — | — | — | — |
| 8 | Lambda 1 VGND | — | — | — | — | — | — | — | — |
| 9 | Lambda 1 Heater Negative | — | W51 | — | 0.5 | OEM-A-10 | — | — | — |
| 10 | PWM 8 | — | W53 | — | 0.5 | OEM-A-11 | — | — | — |
| 11 | Lambda 1 Trim Resistor | — | — | — | — | — | — | — | — |
| 12 | Lambda 1 Nernst Voltage | — | — | — | — | — | — | — | — |
| 13 | — | — | — | — | — | — | — | — | — |
| 14 | — | — | — | — | — | — | — | — | — |
| 15 | — | — | — | — | — | — | — | — | — |
| 16 | — | — | — | — | — | — | — | — | — |
| 17 | Analogue 7 | — | W61 | — | 0.5 | OEM-5-F4 | — | — | — |
| 18 | Analogue 8 | — | W62 | — | 0.5 | OEM-B-7 | — | — | — |
| 19 | — | — | — | — | — | — | — | — | — |
| 20 | — | — | — | — | — | — | — | — | — |
| 21 | — | — | — | — | — | — | — | — | — |
| 22 | PWM 4 | — | W42 | — | 0.5 | OEM-A-7 | — | — | — |
| 23 | PWM 5 | — | W46 | — | 0.5 | RLY1-R-COIL- | — | — | — |
| 24 | PWM 6 | — | W50 | — | 0.5 | RLY2-R-COIL- | — | — | — |
| 25 | PWM 7 | — | W52 | — | 0.5 | OEM-A-12 | — | — | — |
| 26 | Permanent 12v | — | W4 | — | 0.85 | OEM-D-1 | — | — | — |
| 27 | Permanent 12v | — | — | — | — | — | — | — | — |
| 28 | — | — | — | — | — | — | — | — | — |
| 29 | — | — | — | — | — | — | — | — | — |
| 30 | — | — | — | — | — | — | — | — | — |
| 31 | — | — | — | — | — | — | — | — | — |
| 32 | — | — | — | — | — | — | — | — | — |
| 33 | — | — | — | — | — | — | — | — | — |
| 34 | — | — | — | — | — | — | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-5-F2 | Front VTEC pressure switch | digital_in | T4-C2-15 | Digital 5 | digital_in | single_source | |
| OEM-5-F4 | Rear VTEC pressure switch | digital_in | T4-C3-17 | Analogue 7 | analog_in | single_source | |
| OEM-5-F5 | Front VTEC solenoid valve | high_side_out | RLY1-R-OUT | Relay contact output (switched +12 V to load) | power_out | single_source | |
| OEM-5-F7 | Rear VTEC solenoid valve | high_side_out | RLY2-R-OUT | Relay contact output (switched +12 V to load) | power_out | single_source | |
| OEM-A-1 | Injector 1 | injector_out | T4-C1-9 | Injector 1 | injector_out | single_source | |
| OEM-A-10 | Front O2 sensor heater (HTCNTF) | low_side_out | T4-C3-9 | Lambda 1 Heater Negative | low_side_out | single_source | |
| OEM-A-11 | EGR control solenoid | low_side_out | T4-C3-10 | PWM 8 | low_side_out | single_source | |
| OEM-A-12 | Rear O2 sensor heater (HTCNTR) | low_side_out | T4-C3-25 | PWM 7 | low_side_out | single_source | |
| OEM-A-13 | Check engine light (WARN) | low_side_out | — | — | — | single_source | |
| OEM-A-14 | Chamber volume control solenoid (BPS) | low_side_out | — | — | — | single_source | |
| OEM-A-15 | A/C clutch relay (ACC) | low_side_out | T4-C1-4 | PWM 2 | low_side_out | single_source | |
| OEM-A-18 | Radiator fan control (FANCNTR) | low_side_out | T4-C1-3 | PWM 3 | low_side_out | single_source | |
| OEM-A-2 | Injector 4 | injector_out | T4-C1-25 | Injector 4 | injector_out | single_source | |
| OEM-A-20 | EVAP purge cut-off solenoid (PGS) | low_side_out | — | — | — | single_source | |
| OEM-A-21 | Ignition coil 1 | ignition_out | T4-C1-10 | Coil 1 | ignition_out | single_source | |
| OEM-A-22 | Ignition coil 2 | ignition_out | T4-C1-18 | Coil 2 | ignition_out | single_source | |
| OEM-A-23 | Power ground (PG1) | ground | T4-C1-13 + T4-C1-14 | Power Ground 1 + Power Ground 2 | ground | single_source | |
| OEM-A-24 | Power ground (PG2) | ground | T4-C1-13 + T4-C1-14 | Power Ground 1 + Power Ground 2 | ground | single_source | |
| OEM-A-25 | ECU power (IGP1) | power_in | RLY1-R-COIL+ + RLY1-R-IN + RLY2-R-COIL+ + RLY2-R-IN + T4-C1-31 | Relay coil positive (switched +12 V) + Relay contact input (switched +12 V) + Relay coil positive (switched +12 V) + Relay contact input (switched +12 V) + Ignition 12v In | power_in + power_out | single_source | |
| OEM-A-26 | Sensor ground (LG1) | sensor_ground | T4-C2-21 + T4-C2-33 | Sensor Ground + Sensor Ground | sensor_ground | single_source | |
| OEM-A-3 | Injector 2 | injector_out | T4-C1-17 | Injector 2 | injector_out | single_source | |
| OEM-A-4 | Injector 5 | injector_out | T4-C1-9 | Injector 1 | injector_out | corroborated | |
| OEM-A-5 | Injector 3 | injector_out | T4-C1-34 | Injector 3 | injector_out | single_source | |
| OEM-A-6 | Injector 6 | injector_out | T4-C1-17 | Injector 2 | injector_out | single_source | |
| OEM-A-7 | Main relay | low_side_out | T4-C3-22 | PWM 4 | low_side_out | single_source | |
| OEM-A-8 | Fuel pump relay 2 (FLR2) | low_side_out | T4-C1-5 | PWM 1 | low_side_out | single_source | |
| OEM-A-9 | Idle air control valve (IACV) | low_side_out | — | — | — | single_source | |
| OEM-B-10 | CYL 2M — CYP sensor 2 return | sensor_ground | T4-C2-21 + T4-C2-33 | Sensor Ground + Sensor Ground | sensor_ground | single_source | |
| OEM-B-11 | CYL 1P — CYP sensor 1 signal | trigger_in | T4-C2-22 | Cam 1 | trigger_in | single_source | |
| OEM-B-12 | CYL 1M — CYP sensor 1 return | sensor_ground | T4-C2-21 + T4-C2-33 | Sensor Ground + Sensor Ground | sensor_ground | single_source | |
| OEM-B-13 | CRNK 2P — TDC sensor signal | trigger_in | T4-C2-2 | Wheel 1 | digital_in | single_source | |
| OEM-B-14 | CRNK 2M — TDC sensor return | sensor_ground | T4-C2-21 + T4-C2-33 | Sensor Ground + Sensor Ground | sensor_ground | single_source | |
| OEM-B-15 | CRNK 1P — crank sensor signal | trigger_in | T4-C2-12 | Crank | trigger_in | single_source | |
| OEM-B-16 | CRNK 1M — crank sensor return | sensor_ground | T4-C2-21 + T4-C2-33 | Sensor Ground + Sensor Ground | sensor_ground | single_source | |
| OEM-B-2 | Chassis ground (LG2) | ground | T4-C1-13 + T4-C1-14 | Power Ground 1 + Power Ground 2 | ground | single_source | |
| OEM-B-3 | Ignition coil 6 | ignition_out | — | — | — | single_source | |
| OEM-B-4 | Ignition coil 5 | ignition_out | — | — | — | single_source | |
| OEM-B-6 | Ignition coil 4 | ignition_out | T4-C1-26 | Coil 4 | ignition_out | single_source | |
| OEM-B-7 | Neutral switch (M/T) / gear position (A/T) | digital_in | T4-C3-18 | Analogue 8 | analog_in | single_source | |
| OEM-B-8 | Ignition coil 3 | ignition_out | T4-C1-1 | Coil 3 | ignition_out | single_source | |
| OEM-B-9 | CYL 2P — CYP sensor 2 signal | trigger_in | — | — | — | single_source | |
| OEM-C-1 | ECU power (IGP2) | power_in | RLY1-R-COIL+ + RLY1-R-IN + RLY2-R-COIL+ + RLY2-R-IN + T4-C1-31 | Relay coil positive (switched +12 V) + Relay contact input (switched +12 V) + Relay coil positive (switched +12 V) + Relay contact input (switched +12 V) + Ignition 12v In | power_in + power_out | single_source | |
| OEM-C-10 | Traction control | — | — | — | — | single_source | |
| OEM-C-11 | Starter switch (STS) | digital_in | T4-C2-34 | Analogue 9 | analog_in | single_source | |
| OEM-C-12 | Traction control | — | — | — | — | single_source | |
| OEM-C-2 | Vehicle speed sensor (VSS) | digital_in | T4-C2-4 | Digital 1 | digital_in | single_source | |
| OEM-C-3 | A/C switch (ACS) | digital_in | T4-C2-3 | Analogue 10 | analog_in | single_source | |
| OEM-C-4 | Tachometer output (NEP) | tacho_out | — | — | — | single_source | |
| OEM-C-5 | A/C pressure switch (PDSW) | digital_in | T4-C2-16 | Analogue 11 | analog_in | single_source | |
| OEM-C-6 | Traction control | — | — | — | — | single_source | |
| OEM-C-7 | Clutch switch (M/T) | digital_in | — | — | — | single_source | |
| OEM-C-8 | Traction control | — | — | — | — | single_source | |
| OEM-C-9 | Service check connector (SCS) | digital_in | — | — | — | single_source | |
| OEM-D-1 | Battery backup (VBU) | power_in | T4-C3-26 | Permanent 12v | power_in | single_source | |
| OEM-D-11 | Throttle position sensor (TPS) | analog_in | T4-C2-1 | Analogue 2 | analog_in | single_source | |
| OEM-D-12 | EGR lift sensor (EGRL) | analog_in | T4-C2-19 | Analogue 6 | analog_in | single_source | |
| OEM-D-13 | Engine coolant temperature (ECT) | temp_in | T4-C2-7 | Thermistor 1 | temp_in | single_source | |
| OEM-D-14 | Primary O2 sensor | lambda_nb_in | T4-C2-5 | Analogue 3 | analog_in | single_source | |
| OEM-D-15 | Intake air temperature (IAT) | temp_in | T4-C2-25 | Thermistor 2 | temp_in | single_source | |
| OEM-D-16 | Secondary O2 sensor | lambda_nb_in | T4-C2-6 | Analogue 4 | analog_in | single_source | |
| OEM-D-17 | MAP sensor | analog_in | T4-C2-10 | Analogue 1 | analog_in | single_source | |
| OEM-D-18 | +5V sensor supply (VCC) | vref | T4-C2-24 | 5v Output | vref | single_source | |
| OEM-D-19 | +5V sensor supply (VCC) | vref | T4-C2-24 | 5v Output | vref | single_source | |
| OEM-D-20 | +5V sensor supply (VCC) | vref | T4-C2-24 | 5v Output | vref | single_source | |
| OEM-D-21 | Sensor ground (SG) | sensor_ground | T4-C2-21 + T4-C2-33 | Sensor Ground + Sensor Ground | sensor_ground | single_source | |
| OEM-D-22 | Sensor ground (SG) | sensor_ground | T4-C2-21 + T4-C2-33 | Sensor Ground + Sensor Ground | sensor_ground | single_source | |
| OEM-D-3 | Knock sensor — rear | knock_in | — | — | — | single_source | |
| OEM-D-4 | Knock sensor — front | knock_in | — | — | — | single_source | |
| OEM-D-5 | Traction control | — | — | — | — | single_source | |
| OEM-D-6 | Fuel pump voltage monitor (VFP) | — | — | — | — | corroborated | |
| OEM-D-8 | Ignition timing adjuster (IGADJ) | digital_in | — | — | — | single_source | |
| OEM-D-9 | Alternator FR signal | digital_in | T4-C2-14 | Digital 4 | digital_in | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-A-25 | SP-14V-1 | 0.85 | no route | ECU power (IGP1) | — | |
| W2 | OEM-C-1 | SP-14V-1 | 0.85 | no route | ECU power (IGP2) | — | |
| W3 | SP-14V-1 | T4-C1-31 | 0.85 | no route | Ignition 12v In | — | |
| W4 | OEM-D-1 | T4-C3-26 | 0.85 | no route | Battery backup (VBU) | — | |
| W5 | OEM-A-23 | SP-GND-1 | 0.85 | no route | Power ground (PG1) | — | |
| W6 | OEM-A-24 | SP-GND-1 | 0.85 | no route | Power ground (PG2) | — | |
| W7 | OEM-B-2 | SP-GND-1 | 0.85 | no route | Chassis ground (LG2) | — | |
| W8 | SP-GND-1 | T4-C1-13 | 0.85 | no route | Power Ground 1 | — | |
| W9 | SP-GND-1 | T4-C1-14 | 0.85 | no route | Power Ground 2 | — | |
| W10 | OEM-A-26 | SP-0V-1 | 0.5 | no route | Sensor ground (LG1) | — | |
| W11 | OEM-B-10 | SP-0V-1 | 0.5 | no route | CYL 2M — CYP sensor 2 return | — | |
| W12 | OEM-B-12 | SP-0V-1 | 0.5 | no route | CYL 1M — CYP sensor 1 return | — | |
| W13 | OEM-B-14 | SP-0V-1 | 0.5 | no route | CRNK 2M — TDC sensor return | — | |
| W14 | OEM-B-16 | SP-0V-1 | 0.5 | no route | CRNK 1M — crank sensor return | — | |
| W15 | OEM-D-21 | SP-0V-1 | 0.5 | no route | Sensor ground (SG) | — | |
| W16 | OEM-D-22 | SP-0V-1 | 0.5 | no route | Sensor ground (SG) | — | |
| W17 | SP-0V-1 | T4-C2-21 | 0.5 | no route | Sensor Ground | — | |
| W18 | SP-0V-1 | T4-C2-33 | 0.5 | no route | Sensor Ground | — | |
| W19 | OEM-D-18 | SP-5V1-1 | 0.5 | no route | +5V sensor supply (VCC) | — | |
| W20 | OEM-D-19 | SP-5V1-1 | 0.5 | no route | +5V sensor supply (VCC) | — | |
| W21 | OEM-D-20 | SP-5V1-1 | 0.5 | no route | +5V sensor supply (VCC) | — | |
| W22 | SP-5V1-1 | T4-C2-24 | 0.5 | no route | 5v Output | — | |
| W23 | OEM-B-15 | T4-C2-12 | 0.5 | no route | CRNK 1P — crank sensor signal | — | |
| W24 | OEM-B-13 | T4-C2-2 | 0.5 | no route | CRNK 2P — TDC sensor signal | — | |
| W25 | OEM-B-11 | T4-C2-22 | 0.5 | no route | CYL 1P — CYP sensor 1 signal | — | |
| W26 | OEM-A-21 | T4-C1-10 | 0.5 | no route | Ignition coil 1 | — | |
| W27 | OEM-A-22 | T4-C1-18 | 0.5 | no route | Ignition coil 2 | — | |
| W28 | OEM-B-8 | T4-C1-1 | 0.5 | no route | Ignition coil 3 | — | |
| W29 | OEM-B-6 | T4-C1-26 | 0.5 | no route | Ignition coil 4 | — | |
| W30 | OEM-A-1 | T4-C1-9 | 0.5 | no route | Injector 1 | — | |
| W31 | OEM-A-3 | T4-C1-17 | 0.5 | no route | Injector 2 | — | |
| W32 | OEM-A-5 | T4-C1-34 | 0.5 | no route | Injector 3 | — | |
| W33 | OEM-A-2 | T4-C1-25 | 0.5 | no route | Injector 4 | — | |
| W34 | OEM-A-4 | T4-C1-9 | 0.5 | no route | Injector 5 | — | |
| W35 | OEM-A-6 | T4-C1-17 | 0.5 | no route | Injector 6 | — | |
| W36 | OEM-D-17 | T4-C2-10 | 0.5 | no route | MAP sensor | — | |
| W37 | OEM-D-11 | T4-C2-1 | 0.5 | no route | Throttle position sensor (TPS) | — | |
| W38 | OEM-D-13 | T4-C2-7 | 0.5 | no route | Engine coolant temperature (ECT) | — | |
| W39 | OEM-A-8 | T4-C1-5 | 0.5 | no route | Fuel pump relay 2 (FLR2) | — | |
| W40 | OEM-A-15 | T4-C1-4 | 0.5 | no route | A/C clutch relay (ACC) | — | |
| W41 | OEM-A-18 | T4-C1-3 | 0.5 | no route | Radiator fan control (FANCNTR) | — | |
| W42 | OEM-A-7 | T4-C3-22 | 0.5 | no route | Main relay | — | |
| W43 | OEM-5-F5 | RLY1-R-OUT | 0.5 | no route | Front VTEC solenoid valve | — | |
| W44 | SP-14V-1 | RLY1-R-IN | 0.5 | no route | Relay contact input (switched +12 V) | — | |
| W45 | SP-14V-1 | RLY1-R-COIL+ | 0.5 | no route | Relay coil positive (switched +12 V) | — | |
| W46 | RLY1-R-COIL- | T4-C3-23 | 0.5 | no route | Relay coil negative (ECU low-side driver) | — | |
| W47 | OEM-5-F7 | RLY2-R-OUT | 0.5 | no route | Rear VTEC solenoid valve | — | |
| W48 | SP-14V-1 | RLY2-R-IN | 0.5 | no route | Relay contact input (switched +12 V) | — | |
| W49 | SP-14V-1 | RLY2-R-COIL+ | 0.5 | no route | Relay coil positive (switched +12 V) | — | |
| W50 | RLY2-R-COIL- | T4-C3-24 | 0.5 | no route | Relay coil negative (ECU low-side driver) | — | |
| W51 | OEM-A-10 | T4-C3-9 | 0.5 | no route | Front O2 sensor heater (HTCNTF) | — | |
| W52 | OEM-A-12 | T4-C3-25 | 0.5 | no route | Rear O2 sensor heater (HTCNTR) | — | |
| W53 | OEM-A-11 | T4-C3-10 | 0.5 | no route | EGR control solenoid | — | |
| W54 | OEM-D-14 | T4-C2-5 | 0.5 | no route | Primary O2 sensor | — | |
| W55 | OEM-D-16 | T4-C2-6 | 0.5 | no route | Secondary O2 sensor | — | |
| W56 | OEM-D-15 | T4-C2-25 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W57 | OEM-D-12 | T4-C2-19 | 0.5 | no route | EGR lift sensor (EGRL) | — | |
| W58 | OEM-C-2 | T4-C2-4 | 0.5 | no route | Vehicle speed sensor (VSS) | — | |
| W59 | OEM-D-9 | T4-C2-14 | 0.5 | no route | Alternator FR signal | — | |
| W60 | OEM-5-F2 | T4-C2-15 | 0.5 | no route | Front VTEC pressure switch | — | |
| W61 | OEM-5-F4 | T4-C3-17 | 0.5 | no route | Rear VTEC pressure switch | — | |
| W62 | OEM-B-7 | T4-C3-18 | 0.5 | no route | Neutral switch (M/T) / gear position (A/T) | — | |
| W63 | OEM-C-11 | T4-C2-34 | 0.5 | no route | Starter switch (STS) | — | |
| W64 | OEM-C-3 | T4-C2-3 | 0.5 | no route | A/C switch (ACS) | — | |
| W65 | OEM-C-5 | T4-C2-16 | 0.5 | no route | A/C pressure switch (PDSW) | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| connector | 4-1437290-0 | TE | Superseal 1.0 34-way plug, Key 1 | 3.000 | ea |
| terminal | 3-1447221-4 | TE | Superseal 1.0 socket terminal, 20 AWG (0.5 sq mm) | 42.000 | ea |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (16)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | INJECTOR_BALLAST | T4 | The C30A injectors (NSX fuel injector) are low-impedance, but T4 drives saturated (high-Z) injectors only. Add a ballast resistor pack in series with each injector, or use an ECU with low-Z / peak-and-hold injector drivers. |
| error | NET_MERGED | OEM-A-1 + OEM-A-4 + T4-C1-9 | 2 different OEM functions share one net: OEM-A-1 Injector 1; OEM-A-4 Injector 5 |
| error | NET_MERGED | OEM-A-3 + OEM-A-6 + T4-C1-17 | 2 different OEM functions share one net: OEM-A-3 Injector 2; OEM-A-6 Injector 6 |
| error | PHYS_REQUIRED_OPEN | T4-C3-27 | T4-C3-27 "Permanent 12v" is required but not wired. |
| error | REQUIRED_UNMAPPED | OEM-B-3 | Required OEM function "Ignition coil 6" (ignition_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-B-4 | Required OEM function "Ignition coil 5" (ignition_out) is not connected to the new ECU. |
| warn | DATASET_GAP | T4 C1 | 20 of 34 cavities on T4 C1 have no pin data (2,6,7,8,11,12,15,16,19,20,21,22,23,24,27,28,29,30,32,33). Anything there is invisible to these checks. |
| warn | DATASET_GAP | T4 C2 | 11 of 34 cavities on T4 C2 have no pin data (8,11,13,18,20,23,27,29,30,31,32). Anything there is invisible to these checks. |
| warn | DATASET_GAP | T4 C3 | 20 of 34 cavities on T4 C3 have no pin data (1,2,3,4,5,6,13,14,15,16,19,20,21,28,29,30,31,32,33,34). Anything there is invisible to these checks. |
| warn | NET_FAMILY | OEM-5-F4 ↔ T4-C3-17 | OEM-5-F4 "Rear VTEC pressure switch" [digital_in] is wired to T4-C3-17 "Analogue 7" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value. |
| warn | NET_FAMILY | OEM-B-13 ↔ T4-C2-2 | OEM-B-13 "CRNK 2P — TDC sensor signal" [trigger_in] is wired to T4-C2-2 "Wheel 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-7 ↔ T4-C3-18 | OEM-B-7 "Neutral switch (M/T) / gear position (A/T)" [digital_in] is wired to T4-C3-18 "Analogue 8" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value. |
| warn | NET_FAMILY | OEM-C-11 ↔ T4-C2-34 | OEM-C-11 "Starter switch (STS)" [digital_in] is wired to T4-C2-34 "Analogue 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-C-3 ↔ T4-C2-3 | OEM-C-3 "A/C switch (ACS)" [digital_in] is wired to T4-C2-3 "Analogue 10" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value. |
| warn | NET_FAMILY | OEM-C-5 ↔ T4-C2-16 | OEM-C-5 "A/C pressure switch (PDSW)" [digital_in] is wired to T4-C2-16 "Analogue 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. |
| info | UNMAPPED | OEM | 17 optional OEM pins are not mapped: OEM-A-13 Check engine light (WARN); OEM-A-14 Chamber volume control solenoid (BPS); OEM-A-20 EVAP purge cut-off solenoid (PGS); OEM-A-9 Idle air control valve (IACV); OEM-B-9 CYL 2P — CYP sensor 2 signal; OEM-C-10 Traction control; OEM-C-12 Traction control; OEM-C-4 Tachometer output (NEP); OEM-C-6 Traction control; OEM-C-7 Clutch switch (M/T); OEM-C-8 Traction control; OEM-C-9 Service check connector (SCS); OEM-D-3 Knock sensor — rear; OEM-D-4 Knock sensor — front; OEM-D-5 Traction control; OEM-D-6 Fuel pump voltage monitor (VFP); OEM-D-8 Ignition timing adjuster (IGADJ) |
Accepted (0)
| Code | Subject | Reason | By |
|---|
Notes
Fit check: unconfirmed. Confirm these before building: - Trigger pattern for Honda C30A not found in the ECU's docs (C30A (NSX) not documented.) - No knock input; the stock knock sensor would be unused - Only 4 ignition outputs for 6 cylinders: wasted spark (pair coils per firing order) - Only 4 injector outputs for 6 injectors: batch / semi-sequential injection Auto-mapped by auto_map() from the library pin data on 2026-10-11. Review every wire against both manuals before building. Open items: - OEM-B 4: Ignition coil 5: no free ignition output on DTAFast T4 - OEM-B 3: Ignition coil 6: no free ignition output on DTAFast T4 - T4-C3 27: Permanent 12v: required by DTAFast T4 but no stock pin feeds it; wire by hand Not wired: - OEM-B 9: CYL 2P — CYP sensor 2 signal: no free cam_vr/cam_hall/frequency_in input on DTAFast T4 - OEM-D 4: Knock sensor — front: no free knock input on DTAFast T4 - OEM-D 3: Knock sensor — rear: no free knock input on DTAFast T4 - OEM-A 13: Check engine light (WARN): no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T4 - OEM-A 14: Chamber volume control solenoid (BPS): no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T4 - OEM-A 20: EVAP purge cut-off solenoid (PGS): no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T4 - OEM-A 9: Idle air control valve (IACV): no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T4 - OEM-C 4: Tachometer output (NEP): no free tacho/frequency_out/low_side/ls_hs on DTAFast T4 - OEM-C 7: Clutch switch (M/T): no free switch_in/frequency_in/analog_0_5 on DTAFast T4 - OEM-C 9: Service check connector (SCS): no free switch_in/frequency_in/analog_0_5 on DTAFast T4 - OEM-D 8: Ignition timing adjuster (IGADJ): no free switch_in/frequency_in/analog_0_5 on DTAFast T4 - OEM-C 10: Traction control: not classified in the library; wire by hand - OEM-C 12: Traction control: not classified in the library; wire by hand - OEM-C 6: Traction control: not classified in the library; wire by hand - OEM-C 8: Traction control: not classified in the library; wire by hand - OEM-D 5: Traction control: not classified in the library; wire by hand - OEM-D 6: Fuel pump voltage monitor (VFP): not classified in the library; wire by hand
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | AEM EMS 30-1042 (Series 1) plug-and-play install manual — 1991-94 NSX | https://fancy-craft.firebaseapp.com/NSX/report/ecu/EMS_-_30-1042.pdf | archive | 2026-10-05 | 0cad10bc64b5 |
| 4 | vendor_doc | Bosch relay catalogue (mini ISO relays) | https://www.bosch-ibusiness.com/media/downloads/kataloge/relay/2025_10_bosch_relay_catalogue.pdf | archive | 2026-10-05 | 20344cff1ef3 |
| 4 | vendor_doc | DTAFast T4 ECU wiring diagram | https://cdn.shopify.com/s/files/1/0848/7508/4108/files/T4_Wiring_Diagram.pdf?v=1789413067 | — | — | — |
| 4 | community_copy | Honda S2000 Service Manual 2000–2008, Fuel and Emissions Systems | https://www.s2000.wiki/view/images/7/7f/Service_Manual_2000-2008.pdf | archive | 2026-10-05 | a470cfc928e9 |
| 4 | vendor_doc | Omron G8V-RH-1C7T-R-DC12 high-current micro 280 automotive relay datasheet | https://www.alldatasheet.com/datasheet-pdf/pdf/333797/OMRON/G8V-RH-1C7T-R-DC12.html | — | 2026-10-05 | 764a0505a941 |
| 3 | vendor_doc | dodo-upgrades: Honda OBD1 V6 ECU pinout | https://dodo-upgrades.nl/index.php/obd1-v6-pinouts/ | archive | 2026-10-05 | f9539af28904 |