Honda NSX NA1 1991-2005 (C30A) → Motorsport Electronics ME221 (auto)
Honda NSX NA1 1991-2005 (C30A) — Motorsport Electronics — ME221
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-12
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 | 5: read the Findings page before cutting any wire |
| Size of the job | 65 wires · 12 connectors · 0 part lines |
| Tools | Crimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink |
| Order of work | 1. Check every part against the parts list. 2. Cut and label every wire (labels: Export → Wire labels). 3. Crimp and pin connector by connector, ticking the build checklist. 4. Run the bench test with nothing plugged in and the battery disconnected. 5. Only then connect the ECU and power up. |
Build checklist
Tick each box as you go. Continuity: meter from end to end, expect under 1 Ω.
| Wire | From | To | Gauge | Colour | Cut | Label | Crimp A | Crimp B | Pin A | Pin B | Continuity |
|---|---|---|---|---|---|---|---|---|---|---|---|
| W1 | OEM-A-25 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-C-1 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | ME221-C1-15 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | SP-14V-1 | ME221-C1-64 | 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 | ME221-C1-10 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | ME221-C1-61 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | ME221-C1-89 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-GND-1 | ME221-C1-90 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-A-26 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-B-10 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-B-12 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-B-14 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-B-16 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-D-21 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-D-22 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | SP-0V-1 | ME221-C1-52 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | SP-0V-1 | ME221-C1-84 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-D-18 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-D-19 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-D-20 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | SP-5V1-1 | ME221-C1-45 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-B-15 | ME221-C1-80 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-B-13 | ME221-C1-81 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-B-11 | ME221-C1-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-B-9 | ME221-C1-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-D-4 | ME221-C1-53 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-A-21 | ME221-C1-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-A-22 | ME221-C1-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-B-8 | ME221-C1-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-B-6 | ME221-C1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-A-1 | ME221-C1-63 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-A-3 | ME221-C1-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-A-5 | ME221-C1-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-A-2 | ME221-C1-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-A-4 | ME221-C1-63 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-A-6 | ME221-C1-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-D-17 | ME221-C1-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-D-11 | ME221-C1-56 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-D-13 | ME221-C1-86 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-A-8 | ME221-C1-37 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-A-15 | ME221-C1-42 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-A-18 | ME221-C1-72 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-A-7 | ME221-C1-43 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-5-F5 | RLY1-R-OUT | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | SP-14V-1 | RLY1-R-IN | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | SP-14V-1 | RLY1-R-COIL+ | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | RLY1-R-COIL- | ME221-C1-73 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W51 | OEM-5-F7 | RLY2-R-OUT | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W52 | SP-14V-1 | RLY2-R-IN | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W53 | SP-14V-1 | RLY2-R-COIL+ | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W54 | RLY2-R-COIL- | ME221-C1-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W55 | OEM-A-10 | ME221-C1-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W56 | OEM-A-12 | ME221-C1-74 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W57 | OEM-A-11 | ME221-C1-44 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W58 | OEM-A-13 | ME221-C1-69 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W59 | OEM-A-14 | ME221-C1-39 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W60 | OEM-C-4 | ME221-C1-79 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W61 | OEM-D-14 | ME221-C1-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W62 | OEM-D-16 | ME221-C1-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W63 | OEM-D-15 | ME221-C1-57 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W64 | OEM-C-2 | ME221-C1-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W65 | OEM-D-9 | ME221-C1-7 | 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 | ME221-C1-15 | ME221-C1-52 | open (OL) | +12 V supply must not touch sensor ground | |
| 2 | ME221-C1-10 | ME221-C1-15 | open (OL) | power ground must not touch +12 V supply | |
| 3 | ME221-C1-10 | ME221-C1-45 | open (OL) | power ground must not touch 5 V sensor reference | |
| 4 | ME221-C1-10 | RLY1-R-OUT | open (OL) | power ground must not touch +12 V supply | |
| 5 | ME221-C1-10 | RLY2-R-OUT | open (OL) | power ground must not touch +12 V supply | |
| 6 | ME221-C1-15 | ME221-C1-45 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 7 | ME221-C1-45 | RLY1-R-OUT | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 8 | ME221-C1-45 | RLY2-R-OUT | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 9 | ME221-C1-52 | ME221-C1-45 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 10 | ME221-C1-52 | RLY1-R-OUT | open (OL) | sensor ground must not touch +12 V supply | |
| 11 | ME221-C1-52 | RLY2-R-OUT | open (OL) | sensor ground must not touch +12 V supply |
If any reading doesn't match, stop and get help before powering up.
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
ME221-C1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | COIL 4 | — | W33 | — | 0.5 | OEM-B-6 | — | — | — |
| 10 | GROUND CHASSIS | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 12 | LOW SIDE 2 | — | W54 | — | 0.5 | RLY2-R-COIL- | — | — | — |
| 14 | LSU +12V | — | — | — | — | — | — | — | — |
| 15 | IGN +12V | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 16 | LSU HEATER -VE | — | W55 | — | 0.5 | OEM-A-10 | — | — | — |
| 17 | ANA VOLT 3 | — | W61 | — | 0.5 | OEM-D-14 | — | — | — |
| 18 | ANA VOLT 4 | — | W62 | — | 0.5 | OEM-D-16 | — | — | — |
| 19 | LSU UN | — | — | — | — | — | — | — | — |
| 2 | COIL 3 | — | W32 | — | 0.5 | OEM-B-8 | — | — | — |
| 20 | LSU VM | — | — | — | — | — | — | — | — |
| 21 | CAN 1 HIGH | — | — | — | — | — | — | — | — |
| 22 | CAM A VR+ | — | W27 | — | 0.5 | OEM-B-11 | — | — | — |
| 23 | CAM A VR- | — | W28 | — | 0.5 | OEM-B-9 | — | — | — |
| 24 | SERIAL 1 GROUND | — | — | — | — | — | — | — | — |
| 25 | SERIAL 1 TX | — | — | — | — | — | — | — | — |
| 26 | ANA VOLT 1 | — | W40 | — | 0.5 | OEM-D-17 | — | — | — |
| 3 | INJECTOR 4 | — | W37 | — | 0.5 | OEM-A-2 | — | — | — |
| 31 | COIL 2 | — | W31 | — | 0.5 | OEM-A-22 | — | — | — |
| 32 | COIL 1 | — | W30 | — | 0.5 | OEM-A-21 | — | — | — |
| 33 | INJECTOR 3 | — | W36 | — | 0.5 | OEM-A-5 | — | — | — |
| 35 | USB D+ | — | — | — | — | — | — | — | — |
| 36 | USB D- | — | — | — | — | — | — | — | — |
| 37 | LOW SIDE RELAY 11 | — | W43 | — | 0.5 | OEM-A-8 | — | — | — |
| 38 | USB VBUS | — | — | — | — | — | — | — | — |
| 39 | LOW SIDE 6 | — | W59 | — | 0.5 | OEM-A-14 | — | — | — |
| 4 | INJECTOR 2 | — | W35 | — | 0.5 | OEM-A-3 | — | — | — |
| 4 | INJECTOR 2 | — | W39 | — | 0.5 | OEM-A-6 | — | — | — |
| 41 | USB GROUND | — | — | — | — | — | — | — | — |
| 42 | LOW SIDE RELAY 12 | — | W44 | — | 0.5 | OEM-A-15 | — | — | — |
| 43 | LOW SIDE RELAY 14 | — | W46 | — | 0.5 | OEM-A-7 | — | — | — |
| 44 | LOW SIDE 4 | — | W57 | — | 0.5 | OEM-A-11 | — | — | — |
| 45 | 5V REF | — | W24 | — | 0.5 | SP-5V1-1 | — | — | — |
| 46 | 5V REF | — | — | — | — | — | — | — | — |
| 49 | LSU IA | — | — | — | — | — | — | — | — |
| 50 | LSU IP | — | — | — | — | — | — | — | — |
| 51 | CAN 1 LOW | — | — | — | — | — | — | — | — |
| 52 | SENSORS GROUND | — | W19 | — | 0.5 | SP-0V-1 | — | — | — |
| 53 | KNOCK 1 SIGNAL | — | W29 | — | 0.5 | OEM-D-4 | — | — | — |
| 55 | SERIAL 1 RX | — | — | — | — | — | — | — | — |
| 56 | ANA VOLT 2 | — | W41 | — | 0.5 | OEM-D-11 | — | — | — |
| 57 | ANA TEMP 2 | — | W63 | — | 0.5 | OEM-D-15 | — | — | — |
| 6 | DIG_IN 1 | — | W64 | — | 0.5 | OEM-C-2 | — | — | — |
| 61 | GROUND | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 63 | INJECTOR 1 | — | W34 | — | 0.5 | OEM-A-1 | — | — | — |
| 63 | INJECTOR 1 | — | W38 | — | 0.5 | OEM-A-4 | — | — | — |
| 64 | VBAT | — | W4 | — | 0.85 | SP-14V-1 | — | — | — |
| 67 | Stepper 1 / A1 | — | — | — | — | — | — | — | — |
| 68 | Stepper 2 / A2 | — | — | — | — | — | — | — | — |
| 69 | LOW SIDE 5 | — | W58 | — | 0.5 | OEM-A-13 | — | — | — |
| 7 | DIG_IN 2 | — | W65 | — | 0.5 | OEM-D-9 | — | — | — |
| 70 | Stepper 3 / B1 | — | — | — | — | — | — | — | — |
| 71 | Stepper 4 / B2 | — | — | — | — | — | — | — | — |
| 72 | LOW SIDE RELAY 13 | — | W45 | — | 0.5 | OEM-A-18 | — | — | — |
| 73 | LOW SIDE 1 | — | W50 | — | 0.5 | RLY1-R-COIL- | — | — | — |
| 74 | LOW SIDE 3 | — | W56 | — | 0.5 | OEM-A-12 | — | — | — |
| 76 | 5V REF | — | — | — | — | — | — | — | — |
| 79 | TACHOMETER | — | W60 | — | 0.5 | OEM-C-4 | — | — | — |
| 80 | CRANK VR+ | — | W25 | — | 0.5 | OEM-B-15 | — | — | — |
| 81 | CRANK VR- | — | W26 | — | 0.5 | OEM-B-13 | — | — | — |
| 84 | Sensor Ground | — | W20 | — | 0.5 | SP-0V-1 | — | — | — |
| 86 | ANA TEMP 1 | — | W42 | — | 0.5 | OEM-D-13 | — | — | — |
| 89 | GROUND | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| 90 | GROUND | — | W11 | — | 0.85 | SP-GND-1 | — | — | — |
OEM-5
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| F2 | Front VTEC pressure switch | — | — | — | — | — | — | — | — |
| F4 | Rear VTEC pressure switch | — | — | — | — | — | — | — | — |
| F5 | Front VTEC solenoid valve | — | W47 | — | 0.5 | RLY1-R-OUT | — | — | — |
| F7 | Rear VTEC solenoid valve | — | W51 | — | 0.5 | RLY2-R-OUT | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injector 1 | — | W34 | — | 0.5 | ME221-C1-63 | — | — | — |
| 10 | Front O2 sensor heater (HTCNTF) | — | W55 | — | 0.5 | ME221-C1-16 | — | — | — |
| 11 | EGR control solenoid | — | W57 | — | 0.5 | ME221-C1-44 | — | — | — |
| 12 | Rear O2 sensor heater (HTCNTR) | — | W56 | — | 0.5 | ME221-C1-74 | — | — | — |
| 13 | Check engine light (WARN) | — | W58 | — | 0.5 | ME221-C1-69 | — | — | — |
| 14 | Chamber volume control solenoid (BPS) | — | W59 | — | 0.5 | ME221-C1-39 | — | — | — |
| 15 | A/C clutch relay (ACC) | — | W44 | — | 0.5 | ME221-C1-42 | — | — | — |
| 18 | Radiator fan control (FANCNTR) | — | W45 | — | 0.5 | ME221-C1-72 | — | — | — |
| 2 | Injector 4 | — | W37 | — | 0.5 | ME221-C1-3 | — | — | — |
| 20 | EVAP purge cut-off solenoid (PGS) | — | — | — | — | — | — | — | — |
| 21 | Ignition coil 1 | — | W30 | — | 0.5 | ME221-C1-32 | — | — | — |
| 22 | Ignition coil 2 | — | W31 | — | 0.5 | ME221-C1-31 | — | — | — |
| 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) | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 3 | Injector 2 | — | W35 | — | 0.5 | ME221-C1-4 | — | — | — |
| 4 | Injector 5 | — | W38 | — | 0.5 | ME221-C1-63 | — | — | — |
| 5 | Injector 3 | — | W36 | — | 0.5 | ME221-C1-33 | — | — | — |
| 6 | Injector 6 | — | W39 | — | 0.5 | ME221-C1-4 | — | — | — |
| 7 | Main relay | — | W46 | — | 0.5 | ME221-C1-43 | — | — | — |
| 8 | Fuel pump relay 2 (FLR2) | — | W43 | — | 0.5 | ME221-C1-37 | — | — | — |
| 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 | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 11 | CYL 1P — CYP sensor 1 signal | — | W27 | — | 0.5 | ME221-C1-22 | — | — | — |
| 12 | CYL 1M — CYP sensor 1 return | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 13 | CRNK 2P — TDC sensor signal | — | W26 | — | 0.5 | ME221-C1-81 | — | — | — |
| 14 | CRNK 2M — TDC sensor return | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 15 | CRNK 1P — crank sensor signal | — | W25 | — | 0.5 | ME221-C1-80 | — | — | — |
| 16 | CRNK 1M — crank sensor return | — | W16 | — | 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 | — | W33 | — | 0.5 | ME221-C1-1 | — | — | — |
| 7 | Neutral switch (M/T) / gear position (A/T) | — | — | — | — | — | — | — | — |
| 8 | Ignition coil 3 | — | W32 | — | 0.5 | ME221-C1-2 | — | — | — |
| 9 | CYL 2P — CYP sensor 2 signal | — | W28 | — | 0.5 | ME221-C1-23 | — | — | — |
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) | — | — | — | — | — | — | — | — |
| 12 | Traction control | — | — | — | — | — | — | — | — |
| 2 | Vehicle speed sensor (VSS) | — | W64 | — | 0.5 | ME221-C1-6 | — | — | — |
| 3 | A/C switch (ACS) | — | — | — | — | — | — | — | — |
| 4 | Tachometer output (NEP) | — | W60 | — | 0.5 | ME221-C1-79 | — | — | — |
| 5 | A/C pressure switch (PDSW) | — | — | — | — | — | — | — | — |
| 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) | — | — | — | — | — | — | — | — |
| 11 | Throttle position sensor (TPS) | — | W41 | — | 0.5 | ME221-C1-56 | — | — | — |
| 12 | EGR lift sensor (EGRL) | — | — | — | — | — | — | — | — |
| 13 | Engine coolant temperature (ECT) | — | W42 | — | 0.5 | ME221-C1-86 | — | — | — |
| 14 | Primary O2 sensor | — | W61 | — | 0.5 | ME221-C1-17 | — | — | — |
| 15 | Intake air temperature (IAT) | — | W63 | — | 0.5 | ME221-C1-57 | — | — | — |
| 16 | Secondary O2 sensor | — | W62 | — | 0.5 | ME221-C1-18 | — | — | — |
| 17 | MAP sensor | — | W40 | — | 0.5 | ME221-C1-26 | — | — | — |
| 18 | +5V sensor supply (VCC) | — | W21 | — | 0.5 | SP-5V1-1 | — | — | — |
| 19 | +5V sensor supply (VCC) | — | W22 | — | 0.5 | SP-5V1-1 | — | — | — |
| 20 | +5V sensor supply (VCC) | — | W23 | — | 0.5 | SP-5V1-1 | — | — | — |
| 21 | Sensor ground (SG) | — | W17 | — | 0.5 | SP-0V-1 | — | — | — |
| 22 | Sensor ground (SG) | — | W18 | — | 0.5 | SP-0V-1 | — | — | — |
| 3 | Knock sensor — rear | — | — | — | — | — | — | — | — |
| 4 | Knock sensor — front | — | W29 | — | 0.5 | ME221-C1-53 | — | — | — |
| 5 | Traction control | — | — | — | — | — | — | — | — |
| 6 | Fuel pump voltage monitor (VFP) | — | — | — | — | — | — | — | — |
| 8 | Ignition timing adjuster (IGADJ) | — | — | — | — | — | — | — | — |
| 9 | Alternator FR signal | — | W65 | — | 0.5 | ME221-C1-7 | — | — | — |
RLY1-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 | ME221-C1-73 | — | — | — |
| 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-F5 | — | — | — |
RLY2-R
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| COIL+ | Relay coil positive (switched +12 V) | — | W53 | — | 0.5 | SP-14V-1 | — | — | — |
| COIL- | Relay coil negative (ECU low-side driver) | — | W54 | — | 0.5 | ME221-C1-12 | — | — | — |
| IN | Relay contact input (switched +12 V) | — | W52 | — | 0.5 | SP-14V-1 | — | — | — |
| OUT | Relay contact output (switched +12 V to load) | — | W51 | — | 0.5 | OEM-5-F7 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W12 | — | 0.5 | OEM-A-26 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-B-10 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | OEM-B-12 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | OEM-B-14 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | OEM-B-16 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | OEM-D-21 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | OEM-D-22 | — | — | — |
| 1 | — | — | W19 | — | 0.5 | ME221-C1-52 | — | — | — |
| 1 | — | — | W20 | — | 0.5 | ME221-C1-84 | — | — | — |
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 | ME221-C1-15 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | ME221-C1-64 | — | — | — |
| 1 | — | — | W48 | — | 0.5 | RLY1-R-IN | — | — | — |
| 1 | — | — | W49 | — | 0.5 | RLY1-R-COIL+ | — | — | — |
| 1 | — | — | W52 | — | 0.5 | RLY2-R-IN | — | — | — |
| 1 | — | — | W53 | — | 0.5 | RLY2-R-COIL+ | — | — | — |
SP-5V1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W21 | — | 0.5 | OEM-D-18 | — | — | — |
| 1 | — | — | W22 | — | 0.5 | OEM-D-19 | — | — | — |
| 1 | — | — | W23 | — | 0.5 | OEM-D-20 | — | — | — |
| 1 | — | — | W24 | — | 0.5 | ME221-C1-45 | — | — | — |
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-B-2 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | ME221-C1-10 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | ME221-C1-61 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | ME221-C1-89 | — | — | — |
| 1 | — | — | W11 | — | 0.85 | ME221-C1-90 | — | — | — |
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 | — | — | — | single_source | |
| OEM-5-F4 | Rear VTEC pressure switch | digital_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 | ME221-C1-63 | INJECTOR 1 | injector_out | single_source | |
| OEM-A-10 | Front O2 sensor heater (HTCNTF) | low_side_out | ME221-C1-16 | LSU HEATER -VE | low_side_out | single_source | |
| OEM-A-11 | EGR control solenoid | low_side_out | ME221-C1-44 | LOW SIDE 4 | low_side_out | single_source | |
| OEM-A-12 | Rear O2 sensor heater (HTCNTR) | low_side_out | ME221-C1-74 | LOW SIDE 3 | low_side_out | single_source | |
| OEM-A-13 | Check engine light (WARN) | low_side_out | ME221-C1-69 | LOW SIDE 5 | low_side_out | single_source | |
| OEM-A-14 | Chamber volume control solenoid (BPS) | low_side_out | ME221-C1-39 | LOW SIDE 6 | low_side_out | single_source | |
| OEM-A-15 | A/C clutch relay (ACC) | low_side_out | ME221-C1-42 | LOW SIDE RELAY 12 | low_side_out | single_source | |
| OEM-A-18 | Radiator fan control (FANCNTR) | low_side_out | ME221-C1-72 | LOW SIDE RELAY 13 | low_side_out | single_source | |
| OEM-A-2 | Injector 4 | injector_out | ME221-C1-3 | 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 | ME221-C1-32 | COIL 1 | ignition_out | single_source | |
| OEM-A-22 | Ignition coil 2 | ignition_out | ME221-C1-31 | COIL 2 | ignition_out | single_source | |
| OEM-A-23 | Power ground (PG1) | ground | ME221-C1-10 + ME221-C1-61 + ME221-C1-89 + ME221-C1-90 | GROUND CHASSIS + GROUND + GROUND + GROUND | ground | single_source | |
| OEM-A-24 | Power ground (PG2) | ground | ME221-C1-10 + ME221-C1-61 + ME221-C1-89 + ME221-C1-90 | GROUND CHASSIS + GROUND + GROUND + GROUND | ground | single_source | |
| OEM-A-25 | ECU power (IGP1) | power_in | ME221-C1-15 + ME221-C1-64 + RLY1-R-COIL+ + RLY1-R-IN + RLY2-R-COIL+ + RLY2-R-IN | IGN +12V + VBAT + Relay coil positive (switched +12 V) + Relay contact input (switched +12 V) + Relay coil positive (switched +12 V) + Relay contact input (switched +12 V) | power_in + power_out | single_source | |
| OEM-A-26 | Sensor ground (LG1) | sensor_ground | ME221-C1-52 + ME221-C1-84 | SENSORS GROUND + Sensor Ground | sensor_ground | single_source | |
| OEM-A-3 | Injector 2 | injector_out | ME221-C1-4 | INJECTOR 2 | injector_out | single_source | |
| OEM-A-4 | Injector 5 | injector_out | ME221-C1-63 | INJECTOR 1 | injector_out | corroborated | |
| OEM-A-5 | Injector 3 | injector_out | ME221-C1-33 | INJECTOR 3 | injector_out | single_source | |
| OEM-A-6 | Injector 6 | injector_out | ME221-C1-4 | INJECTOR 2 | injector_out | single_source | |
| OEM-A-7 | Main relay | low_side_out | ME221-C1-43 | LOW SIDE RELAY 14 | low_side_out | single_source | |
| OEM-A-8 | Fuel pump relay 2 (FLR2) | low_side_out | ME221-C1-37 | LOW SIDE RELAY 11 | 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 | ME221-C1-52 + ME221-C1-84 | SENSORS GROUND + Sensor Ground | sensor_ground | single_source | |
| OEM-B-11 | CYL 1P — CYP sensor 1 signal | trigger_in | ME221-C1-22 | CAM A VR+ | trigger_in | single_source | |
| OEM-B-12 | CYL 1M — CYP sensor 1 return | sensor_ground | ME221-C1-52 + ME221-C1-84 | SENSORS GROUND + Sensor Ground | sensor_ground | single_source | |
| OEM-B-13 | CRNK 2P — TDC sensor signal | trigger_in | ME221-C1-81 | CRANK VR- | trigger_in | single_source | |
| OEM-B-14 | CRNK 2M — TDC sensor return | sensor_ground | ME221-C1-52 + ME221-C1-84 | SENSORS GROUND + Sensor Ground | sensor_ground | single_source | |
| OEM-B-15 | CRNK 1P — crank sensor signal | trigger_in | ME221-C1-80 | CRANK VR+ | trigger_in | single_source | |
| OEM-B-16 | CRNK 1M — crank sensor return | sensor_ground | ME221-C1-52 + ME221-C1-84 | SENSORS GROUND + Sensor Ground | sensor_ground | single_source | |
| OEM-B-2 | Chassis ground (LG2) | ground | ME221-C1-10 + ME221-C1-61 + ME221-C1-89 + ME221-C1-90 | GROUND CHASSIS + GROUND + GROUND + GROUND | 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 | ME221-C1-1 | COIL 4 | ignition_out | single_source | |
| OEM-B-7 | Neutral switch (M/T) / gear position (A/T) | digital_in | — | — | — | single_source | |
| OEM-B-8 | Ignition coil 3 | ignition_out | ME221-C1-2 | COIL 3 | ignition_out | single_source | |
| OEM-B-9 | CYL 2P — CYP sensor 2 signal | trigger_in | ME221-C1-23 | CAM A VR- | trigger_in | single_source | |
| OEM-C-1 | ECU power (IGP2) | power_in | ME221-C1-15 + ME221-C1-64 + RLY1-R-COIL+ + RLY1-R-IN + RLY2-R-COIL+ + RLY2-R-IN | IGN +12V + VBAT + Relay coil positive (switched +12 V) + Relay contact input (switched +12 V) + Relay coil positive (switched +12 V) + Relay contact input (switched +12 V) | power_in + power_out | single_source | |
| OEM-C-10 | Traction control | — | — | — | — | single_source | |
| OEM-C-11 | Starter switch (STS) | digital_in | — | — | — | single_source | |
| OEM-C-12 | Traction control | — | — | — | — | single_source | |
| OEM-C-2 | Vehicle speed sensor (VSS) | digital_in | ME221-C1-6 | DIG_IN 1 | digital_in | single_source | |
| OEM-C-3 | A/C switch (ACS) | digital_in | — | — | — | single_source | |
| OEM-C-4 | Tachometer output (NEP) | tacho_out | ME221-C1-79 | TACHOMETER | tacho_out | single_source | |
| OEM-C-5 | A/C pressure switch (PDSW) | digital_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 | — | — | — | single_source | |
| OEM-D-11 | Throttle position sensor (TPS) | analog_in | ME221-C1-56 | ANA VOLT 2 | analog_in | single_source | |
| OEM-D-12 | EGR lift sensor (EGRL) | analog_in | — | — | — | single_source | |
| OEM-D-13 | Engine coolant temperature (ECT) | temp_in | ME221-C1-86 | ANA TEMP 1 | temp_in | single_source | |
| OEM-D-14 | Primary O2 sensor | lambda_nb_in | ME221-C1-17 | ANA VOLT 3 | analog_in | single_source | |
| OEM-D-15 | Intake air temperature (IAT) | temp_in | ME221-C1-57 | ANA TEMP 2 | temp_in | single_source | |
| OEM-D-16 | Secondary O2 sensor | lambda_nb_in | ME221-C1-18 | ANA VOLT 4 | analog_in | single_source | |
| OEM-D-17 | MAP sensor | analog_in | ME221-C1-26 | ANA VOLT 1 | analog_in | single_source | |
| OEM-D-18 | +5V sensor supply (VCC) | vref | ME221-C1-45 | 5V REF | vref | single_source | |
| OEM-D-19 | +5V sensor supply (VCC) | vref | ME221-C1-45 | 5V REF | vref | single_source | |
| OEM-D-20 | +5V sensor supply (VCC) | vref | ME221-C1-45 | 5V REF | vref | single_source | |
| OEM-D-21 | Sensor ground (SG) | sensor_ground | ME221-C1-52 + ME221-C1-84 | SENSORS GROUND + Sensor Ground | sensor_ground | single_source | |
| OEM-D-22 | Sensor ground (SG) | sensor_ground | ME221-C1-52 + ME221-C1-84 | SENSORS 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 | ME221-C1-53 | KNOCK 1 SIGNAL | 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 | ME221-C1-7 | DIG_IN 2 | 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 | ME221-C1-15 | 0.85 | no route | IGN +12V | — | |
| W4 | SP-14V-1 | ME221-C1-64 | 0.85 | no route | VBAT | — | |
| 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 | ME221-C1-10 | 0.85 | no route | GROUND CHASSIS | — | |
| W9 | SP-GND-1 | ME221-C1-61 | 0.85 | no route | GROUND | — | |
| W10 | SP-GND-1 | ME221-C1-89 | 0.85 | no route | GROUND | — | |
| W11 | SP-GND-1 | ME221-C1-90 | 0.85 | no route | GROUND | — | |
| W12 | OEM-A-26 | SP-0V-1 | 0.5 | no route | Sensor ground (LG1) | — | |
| W13 | OEM-B-10 | SP-0V-1 | 0.5 | no route | CYL 2M — CYP sensor 2 return | — | |
| W14 | OEM-B-12 | SP-0V-1 | 0.5 | no route | CYL 1M — CYP sensor 1 return | — | |
| W15 | OEM-B-14 | SP-0V-1 | 0.5 | no route | CRNK 2M — TDC sensor return | — | |
| W16 | OEM-B-16 | SP-0V-1 | 0.5 | no route | CRNK 1M — crank sensor return | — | |
| W17 | OEM-D-21 | SP-0V-1 | 0.5 | no route | Sensor ground (SG) | — | |
| W18 | OEM-D-22 | SP-0V-1 | 0.5 | no route | Sensor ground (SG) | — | |
| W19 | SP-0V-1 | ME221-C1-52 | 0.5 | no route | SENSORS GROUND | — | |
| W20 | SP-0V-1 | ME221-C1-84 | 0.5 | no route | Sensor Ground | — | |
| W21 | OEM-D-18 | SP-5V1-1 | 0.5 | no route | +5V sensor supply (VCC) | — | |
| W22 | OEM-D-19 | SP-5V1-1 | 0.5 | no route | +5V sensor supply (VCC) | — | |
| W23 | OEM-D-20 | SP-5V1-1 | 0.5 | no route | +5V sensor supply (VCC) | — | |
| W24 | SP-5V1-1 | ME221-C1-45 | 0.5 | no route | 5V REF | — | |
| W25 | OEM-B-15 | ME221-C1-80 | 0.5 | no route | CRNK 1P — crank sensor signal | — | |
| W26 | OEM-B-13 | ME221-C1-81 | 0.5 | no route | CRNK 2P — TDC sensor signal | — | |
| W27 | OEM-B-11 | ME221-C1-22 | 0.5 | no route | CYL 1P — CYP sensor 1 signal | — | |
| W28 | OEM-B-9 | ME221-C1-23 | 0.5 | no route | CYL 2P — CYP sensor 2 signal | — | |
| W29 | OEM-D-4 | ME221-C1-53 | 0.5 | no route | Knock sensor — front | — | |
| W30 | OEM-A-21 | ME221-C1-32 | 0.5 | no route | Ignition coil 1 | — | |
| W31 | OEM-A-22 | ME221-C1-31 | 0.5 | no route | Ignition coil 2 | — | |
| W32 | OEM-B-8 | ME221-C1-2 | 0.5 | no route | Ignition coil 3 | — | |
| W33 | OEM-B-6 | ME221-C1-1 | 0.5 | no route | Ignition coil 4 | — | |
| W34 | OEM-A-1 | ME221-C1-63 | 0.5 | no route | Injector 1 | — | |
| W35 | OEM-A-3 | ME221-C1-4 | 0.5 | no route | Injector 2 | — | |
| W36 | OEM-A-5 | ME221-C1-33 | 0.5 | no route | Injector 3 | — | |
| W37 | OEM-A-2 | ME221-C1-3 | 0.5 | no route | Injector 4 | — | |
| W38 | OEM-A-4 | ME221-C1-63 | 0.5 | no route | Injector 5 | — | |
| W39 | OEM-A-6 | ME221-C1-4 | 0.5 | no route | Injector 6 | — | |
| W40 | OEM-D-17 | ME221-C1-26 | 0.5 | no route | MAP sensor | — | |
| W41 | OEM-D-11 | ME221-C1-56 | 0.5 | no route | Throttle position sensor (TPS) | — | |
| W42 | OEM-D-13 | ME221-C1-86 | 0.5 | no route | Engine coolant temperature (ECT) | — | |
| W43 | OEM-A-8 | ME221-C1-37 | 0.5 | no route | Fuel pump relay 2 (FLR2) | — | |
| W44 | OEM-A-15 | ME221-C1-42 | 0.5 | no route | A/C clutch relay (ACC) | — | |
| W45 | OEM-A-18 | ME221-C1-72 | 0.5 | no route | Radiator fan control (FANCNTR) | — | |
| W46 | OEM-A-7 | ME221-C1-43 | 0.5 | no route | Main relay | — | |
| W47 | OEM-5-F5 | RLY1-R-OUT | 0.5 | no route | Front VTEC solenoid valve | — | |
| W48 | SP-14V-1 | RLY1-R-IN | 0.5 | no route | Relay contact input (switched +12 V) | — | |
| W49 | SP-14V-1 | RLY1-R-COIL+ | 0.5 | no route | Relay coil positive (switched +12 V) | — | |
| W50 | RLY1-R-COIL- | ME221-C1-73 | 0.5 | no route | Relay coil negative (ECU low-side driver) | — | |
| W51 | OEM-5-F7 | RLY2-R-OUT | 0.5 | no route | Rear VTEC solenoid valve | — | |
| W52 | SP-14V-1 | RLY2-R-IN | 0.5 | no route | Relay contact input (switched +12 V) | — | |
| W53 | SP-14V-1 | RLY2-R-COIL+ | 0.5 | no route | Relay coil positive (switched +12 V) | — | |
| W54 | RLY2-R-COIL- | ME221-C1-12 | 0.5 | no route | Relay coil negative (ECU low-side driver) | — | |
| W55 | OEM-A-10 | ME221-C1-16 | 0.5 | no route | Front O2 sensor heater (HTCNTF) | — | |
| W56 | OEM-A-12 | ME221-C1-74 | 0.5 | no route | Rear O2 sensor heater (HTCNTR) | — | |
| W57 | OEM-A-11 | ME221-C1-44 | 0.5 | no route | EGR control solenoid | — | |
| W58 | OEM-A-13 | ME221-C1-69 | 0.5 | no route | Check engine light (WARN) | — | |
| W59 | OEM-A-14 | ME221-C1-39 | 0.5 | no route | Chamber volume control solenoid (BPS) | — | |
| W60 | OEM-C-4 | ME221-C1-79 | 0.5 | no route | Tachometer output (NEP) | — | |
| W61 | OEM-D-14 | ME221-C1-17 | 0.5 | no route | Primary O2 sensor | — | |
| W62 | OEM-D-16 | ME221-C1-18 | 0.5 | no route | Secondary O2 sensor | — | |
| W63 | OEM-D-15 | ME221-C1-57 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W64 | OEM-C-2 | ME221-C1-6 | 0.5 | no route | Vehicle speed sensor (VSS) | — | |
| W65 | OEM-D-9 | ME221-C1-7 | 0.5 | no route | Alternator FR signal | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (6)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | INJECTOR_BALLAST | ME221 | The C30A injectors (NSX fuel injector) are low-impedance, but ME221 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 | ME221-C1-4 + OEM-A-3 + OEM-A-6 | 2 different OEM functions share one net: OEM-A-3 Injector 2; OEM-A-6 Injector 6 |
| error | NET_MERGED | ME221-C1-63 + OEM-A-1 + OEM-A-4 | 2 different OEM functions share one net: OEM-A-1 Injector 1; OEM-A-4 Injector 5 |
| 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. |
| info | UNMAPPED | OEM | 19 optional OEM pins are not mapped: OEM-5-F2 Front VTEC pressure switch; OEM-5-F4 Rear VTEC pressure switch; OEM-A-20 EVAP purge cut-off solenoid (PGS); OEM-A-9 Idle air control valve (IACV); OEM-B-7 Neutral switch (M/T) / gear position (A/T); OEM-C-10 Traction control; OEM-C-11 Starter switch (STS); OEM-C-12 Traction control; OEM-C-3 A/C switch (ACS); OEM-C-5 A/C pressure switch (PDSW); 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-12 EGR lift sensor (EGRL); OEM-D-3 Knock sensor — rear; OEM-D-5 Traction control; OEM-D-6 Fuel pump voltage monitor (VFP); OEM-D-8 Ignition timing adjuster (IGADJ) |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-D-1 | Battery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed. | mapping-proposal |
Notes
Fit check: unconfirmed. Confirm these before building: - Trigger pattern for Honda C30A not found in the ECU's docs (Trigger-pattern list is only inside MEITE software, not published online) - 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 Motorsport Electronics ME221 - OEM-B 3: Ignition coil 6: no free ignition output on Motorsport Electronics ME221 Not wired: - OEM-D 1: Battery backup (VBU): Motorsport Electronics ME221 has no battery-constant input; not needed - OEM-D 3: Knock sensor — rear: no free knock input on Motorsport Electronics ME221 - OEM-A 20: EVAP purge cut-off solenoid (PGS): no free low_side/relay_control/heater_low_side/ls_hs/injector on Motorsport Electronics ME221 - OEM-A 9: Idle air control valve (IACV): no free low_side/relay_control/heater_low_side/ls_hs/injector on Motorsport Electronics ME221 - OEM-D 12: EGR lift sensor (EGRL): no free analog_0_5 on Motorsport Electronics ME221 - OEM-5 F2: Front VTEC pressure switch: no free switch_in/frequency_in/analog_0_5 on Motorsport Electronics ME221 - OEM-5 F4: Rear VTEC pressure switch: no free switch_in/frequency_in/analog_0_5 on Motorsport Electronics ME221 - OEM-B 7: Neutral switch (M/T) / gear position (A/T): no free switch_in/frequency_in/analog_0_5 on Motorsport Electronics ME221 - OEM-C 11: Starter switch (STS): no free switch_in/frequency_in/analog_0_5 on Motorsport Electronics ME221 - OEM-C 3: A/C switch (ACS): no free switch_in/frequency_in/analog_0_5 on Motorsport Electronics ME221 - OEM-C 5: A/C pressure switch (PDSW): no free switch_in/frequency_in/analog_0_5 on Motorsport Electronics ME221 - OEM-C 7: Clutch switch (M/T): no free switch_in/frequency_in/analog_0_5 on Motorsport Electronics ME221 - OEM-C 9: Service check connector (SCS): no free switch_in/frequency_in/analog_0_5 on Motorsport Electronics ME221 - OEM-D 8: Ignition timing adjuster (IGADJ): no free switch_in/frequency_in/analog_0_5 on Motorsport Electronics ME221 - 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 | 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 | Motorsport Electronics GEN2 ME221/ME360/ME442 wire-in pinout | https://motorsport-electronics.co.uk/onlinehelp/html/ME442ME360ME221GEN2Wire-InPinout.html | — | — | — |
| 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 |