AP2 2004–05 (F22C1, cable) → AMP EFI Microsquirt (auto)
AP2 2004–05 (F22C1, cable) — AMP EFI — Microsquirt
⚠ 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 | 4: read the Findings page before cutting any wire |
| Size of the job | 48 wires · 10 connectors · 4 part lines |
| Tools | Crimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink |
| Order of work | 1. Check every part against the parts list. 2. Cut and label every wire (labels: Export → Wire labels). 3. Crimp and pin connector by connector, ticking the build checklist. 4. Run the bench test with nothing plugged in and the battery disconnected. 5. Only then connect the ECU and power up. |
Build checklist
Tick each box as you go. Continuity: meter from end to end, expect under 1 Ω.
| Wire | From | To | Gauge | Colour | Cut | Label | Crimp A | Crimp B | Pin A | Pin B | Continuity |
|---|---|---|---|---|---|---|---|---|---|---|---|
| W1 | OEM-B-1 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-B-9 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | MICROSQUIRT-A-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-B-10 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-B-2 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-B-20 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-B-22 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | MICROSQUIRT-A-22 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | MICROSQUIRT-A-23 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-C-18 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-C-30 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-C-31 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-C-7 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | SP-0V-1 | MICROSQUIRT-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-0V-1 | MICROSQUIRT-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-0V-1 | MICROSQUIRT-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-C-19 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-C-28 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | SP-5V1-1 | MICROSQUIRT-A-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-C-8 | MICROSQUIRT-A-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-C-9 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-C-20 | MICROSQUIRT-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-C-21 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-C-29 | MICROSQUIRT-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-C-4 | MICROSQUIRT-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-C-12 | MICROSQUIRT-A-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-B-11 | MICROSQUIRT-A-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-B-3 | MICROSQUIRT-A-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-B-4 | MICROSQUIRT-A-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-B-5 | MICROSQUIRT-A-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-A-15 | MICROSQUIRT-A-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-B-12 | RLY1-R-OUT | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | SP-14V-1 | RLY1-R-IN | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | SP-14V-1 | RLY1-R-COIL+ | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | RLY1-R-COIL- | MICROSQUIRT-A-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-C-17 | MICROSQUIRT-A-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-C-27 | MICROSQUIRT-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-C-26 | MICROSQUIRT-A-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-A-16 | MICROSQUIRT-A-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-A-17 | MICROSQUIRT-A-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-A-19 | MICROSQUIRT-A-35 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-A-23 | MICROSQUIRT-A-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-C-15 | MICROSQUIRT-A-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-C-16 | MICROSQUIRT-A-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-C-25 | MICROSQUIRT-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-A-9 | MICROSQUIRT-A-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-C-5 | MICROSQUIRT-A-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-A-24 | MICROSQUIRT-A-6 | 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 | MICROSQUIRT-A-1 | MICROSQUIRT-A-18 | open (OL) | +12 V supply must not touch sensor ground | |
| 2 | MICROSQUIRT-A-1 | MICROSQUIRT-A-22 | open (OL) | +12 V supply must not touch power ground | |
| 3 | RLY1-R-OUT | MICROSQUIRT-A-18 | open (OL) | +12 V supply must not touch sensor ground | |
| 4 | MICROSQUIRT-A-1 | MICROSQUIRT-A-28 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 5 | MICROSQUIRT-A-18 | MICROSQUIRT-A-28 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 6 | MICROSQUIRT-A-22 | MICROSQUIRT-A-28 | open (OL) | power ground must not touch 5 V sensor reference | |
| 7 | MICROSQUIRT-A-22 | RLY1-R-OUT | open (OL) | power ground must not touch +12 V supply | |
| 8 | RLY1-R-OUT | MICROSQUIRT-A-28 | 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
MICROSQUIRT-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | +12V In | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 10 | INJ 2 | — | W28 | — | 0.5 | OEM-B-3 | — | — | — |
| 10 | INJ 2 | — | W30 | — | 0.5 | OEM-B-5 | — | — | — |
| 11 | SPK B (IGN2) | — | W25 | — | 0.5 | OEM-C-4 | — | — | — |
| 12 | SPK A (IGN 1) | — | W26 | — | 0.5 | OEM-C-12 | — | — | — |
| 13 | RX | — | — | — | — | — | — | — | — |
| 14 | TX | — | — | — | — | — | — | — | — |
| 15 | BOOT LOAD | — | — | — | — | — | — | — | — |
| 16 | ALED | — | W35 | — | 0.5 | RLY1-R-COIL- | — | — | — |
| 17 | WLED | — | W39 | — | 0.5 | OEM-A-16 | — | — | — |
| 18 | Sensor Ground | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | Serial Ground | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 2 | CANH | — | — | — | — | — | — | — | — |
| 20 | Sensor Ground | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 21 | VR2- | — | W24 | — | 0.5 | OEM-C-29 | — | — | — |
| 22 | POWER GROUND | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 23 | POWER GROUND | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 24 | MAP | — | W36 | — | 0.5 | OEM-C-17 | — | — | — |
| 25 | CLT | — | W38 | — | 0.5 | OEM-C-26 | — | — | — |
| 26 | MAT | — | W45 | — | 0.5 | OEM-C-25 | — | — | — |
| 27 | TPS | — | W37 | — | 0.5 | OEM-C-27 | — | — | — |
| 28 | TPS VREF (5V) | — | W19 | — | 0.5 | SP-5V1-1 | — | — | — |
| 29 | SPAREADC | — | W44 | — | 0.5 | OEM-C-16 | — | — | — |
| 3 | CANL | — | — | — | — | — | — | — | — |
| 30 | OPTO+ | — | W46 | — | 0.5 | OEM-A-9 | — | — | — |
| 31 | OPTO- | — | W47 | — | 0.5 | OEM-C-5 | — | — | — |
| 32 | VR1+ | — | W20 | — | 0.5 | OEM-C-8 | — | — | — |
| 33 | VR1- | — | — | — | — | — | — | — | — |
| 34 | O2 | — | W42 | — | 0.5 | OEM-A-23 | — | — | — |
| 35 | TACHO | — | W41 | — | 0.5 | OEM-A-19 | — | — | — |
| 4 | VR2+ | — | W22 | — | 0.5 | OEM-C-20 | — | — | — |
| 5 | SPAREADC2 (MAF) | — | W43 | — | 0.5 | OEM-C-15 | — | — | — |
| 6 | FLEX | — | W48 | — | 0.5 | OEM-A-24 | — | — | — |
| 7 | FIDLE | — | W40 | — | 0.5 | OEM-A-17 | — | — | — |
| 8 | FP (pump) | — | W31 | — | 0.5 | OEM-A-15 | — | — | — |
| 9 | INJ 1 | — | W27 | — | 0.5 | OEM-B-11 | — | — | — |
| 9 | INJ 1 | — | W29 | — | 0.5 | OEM-B-4 | — | — | — |
OEM-A
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Coolant temp gauge drive | — | — | — | — | — | — | — | — |
| 2 | Air control valve solenoid | — | — | — | — | — | — | — | — |
| 3 | Evap bypass solenoid | — | — | — | — | — | — | — | — |
| 4 | Evap canister vent shut valve | — | — | — | — | — | — | — | — |
| 5 | NC | — | — | — | — | — | — | — | — |
| 6 | Evap canister purge valve | — | — | — | — | — | — | — | — |
| 7 | NC | — | — | — | — | — | — | — | — |
| 8 | NC | — | — | — | — | — | — | — | — |
| 9 | Vehicle speed sensor | — | W46 | — | 0.5 | MICROSQUIRT-A-30 | — | — | — |
| 10 | Service check signal | — | — | — | — | — | — | — | — |
| 11 | NC | — | — | — | — | — | — | — | — |
| 12 | Immobilizer indicator light | — | — | — | — | — | — | — | — |
| 13 | Immobilizer enable signal | — | — | — | — | — | — | — | — |
| 14 | NC | — | — | — | — | — | — | — | — |
| 15 | Fuel pump relay (USDM) | — | W31 | — | 0.5 | MICROSQUIRT-A-8 | — | — | — |
| 16 | Fuel pump relay (JDM) | — | W39 | — | 0.5 | MICROSQUIRT-A-17 | — | — | — |
| 17 | A/C clutch relay | — | W40 | — | 0.5 | MICROSQUIRT-A-7 | — | — | — |
| 18 | Check engine light (MIL) | — | — | — | — | — | — | — | — |
| 19 | Tacho output | — | W41 | — | 0.5 | MICROSQUIRT-A-35 | — | — | — |
| 20 | Radiator fan relay | — | — | — | — | — | — | — | — |
| 21 | K-Line | — | — | — | — | — | — | — | — |
| 22 | NC | — | — | — | — | — | — | — | — |
| 23 | Secondary O2 sensor | — | W42 | — | 0.5 | MICROSQUIRT-A-34 | — | — | — |
| 24 | Starter switch signal | — | W48 | — | 0.5 | MICROSQUIRT-A-6 | — | — | — |
| 25 | Immobilizer code | — | — | — | — | — | — | — | — |
| 26 | Power steering load detect | — | — | — | — | — | — | — | — |
| 27 | A/C switch (request) | — | — | — | — | — | — | — | — |
| 28 | Air pump relay | — | — | — | — | — | — | — | — |
| 29 | Fuel tank pressure sensor | — | — | — | — | — | — | — | — |
| 30 | Electrical load detector | — | — | — | — | — | — | — | — |
| 31 | NC | — | — | — | — | — | — | — | — |
| 32 | Brake switch | — | — | — | — | — | — | — | — |
OEM-B
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Power source 1 (main relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 2 | Power ground 1 | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 3 | Injector 2 | — | W28 | — | 0.5 | MICROSQUIRT-A-10 | — | — | — |
| 4 | Injector 3 | — | W29 | — | 0.5 | MICROSQUIRT-A-9 | — | — | — |
| 5 | Injector 4 | — | W30 | — | 0.5 | MICROSQUIRT-A-10 | — | — | — |
| 6 | NC | — | — | — | — | — | — | — | — |
| 7 | NC | — | — | — | — | — | — | — | — |
| 8 | NC | — | — | — | — | — | — | — | — |
| 9 | Power source 2 (main relay) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 10 | Power ground 2 | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| 11 | Injector 1 | — | W27 | — | 0.5 | MICROSQUIRT-A-9 | — | — | — |
| 12 | VTEC solenoid | — | W32 | — | 0.5 | RLY1-R-OUT | — | — | — |
| 13 | NC | — | — | — | — | — | — | — | — |
| 14 | NC | — | — | — | — | — | — | — | — |
| 15 | NC | — | — | — | — | — | — | — | — |
| 16 | NC | — | — | — | — | — | — | — | — |
| 17 | NC | — | — | — | — | — | — | — | — |
| 18 | NC | — | — | — | — | — | — | — | — |
| 19 | NC | — | — | — | — | — | — | — | — |
| 20 | Ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 21 | Backup power (battery constant) | — | — | — | — | — | — | — | — |
| 22 | Ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 23 | Idle air control valve | — | — | — | — | — | — | — | — |
| 24 | NC | — | — | — | — | — | — | — | — |
| 25 | NC | — | — | — | — | — | — | — | — |
OEM-C
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Primary O2 heater | — | — | — | — | — | — | — | — |
| 2 | Alternator control | — | — | — | — | — | — | — | — |
| 3 | Knock sensor | — | — | — | — | — | — | — | — |
| 4 | Ignition coil 1 | — | W25 | — | 0.5 | MICROSQUIRT-A-11 | — | — | — |
| 5 | Alternator FR signal | — | W47 | — | 0.5 | MICROSQUIRT-A-31 | — | — | — |
| 6 | NC | — | — | — | — | — | — | — | — |
| 7 | Sensor ground 1 | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 8 | Crank sensor + (CKP+) | — | W20 | — | 0.5 | MICROSQUIRT-A-32 | — | — | — |
| 9 | Crank sensor − (CKP−) | — | W21 | — | 0.5 | SP-0V-1 | — | — | — |
| 10 | VTEC pressure switch | — | — | — | — | — | — | — | — |
| 11 | Secondary O2 heater control | — | — | — | — | — | — | — | — |
| 12 | Ignition coil 2 | — | W26 | — | 0.5 | MICROSQUIRT-A-12 | — | — | — |
| 13 | Ignition coil 3 | — | — | — | — | — | — | — | — |
| 14 | Ignition coil 4 | — | — | — | — | — | — | — | — |
| 15 | Secondary O2 sensor | — | W43 | — | 0.5 | MICROSQUIRT-A-5 | — | — | — |
| 16 | Primary O2 sensor | — | W44 | — | 0.5 | MICROSQUIRT-A-29 | — | — | — |
| 17 | MAP sensor | — | W36 | — | 0.5 | MICROSQUIRT-A-24 | — | — | — |
| 18 | Sensor ground 2 | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | Sensor 5V supply 1 (MAP) | — | W17 | — | 0.5 | SP-5V1-1 | — | — | — |
| 20 | Cam (TDC1) sensor + | — | W22 | — | 0.5 | MICROSQUIRT-A-4 | — | — | — |
| 21 | Cam (TDC1) sensor − | — | W23 | — | 0.5 | SP-0V-1 | — | — | — |
| 22 | Knock sensor | — | — | — | — | — | — | — | — |
| 23 | NC | — | — | — | — | — | — | — | — |
| 24 | Air pump electric current sensor | — | — | — | — | — | — | — | — |
| 25 | Intake air temp sensor | — | W45 | — | 0.5 | MICROSQUIRT-A-26 | — | — | — |
| 26 | Coolant temp sensor | — | W38 | — | 0.5 | MICROSQUIRT-A-25 | — | — | — |
| 27 | Throttle position sensor | — | W37 | — | 0.5 | MICROSQUIRT-A-27 | — | — | — |
| 28 | Sensor 5V supply 2 | — | W18 | — | 0.5 | SP-5V1-1 | — | — | — |
| 29 | Cam (TDC2) sensor + | — | W24 | — | 0.5 | MICROSQUIRT-A-21 | — | — | — |
| 30 | Cam (TDC2) sensor − | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 31 | Timing ground | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
OEM-D
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | NC | — | — | — | — | — | — | — | — |
| 2 | NC | — | — | — | — | — | — | — | — |
| 3 | NC | — | — | — | — | — | — | — | — |
| 4 | NC | — | — | — | — | — | — | — | — |
| 5 | NC | — | — | — | — | — | — | — | — |
| 6 | NC | — | — | — | — | — | — | — | — |
| 7 | NC | — | — | — | — | — | — | — | — |
| 8 | NC | — | — | — | — | — | — | — | — |
| 9 | NC | — | — | — | — | — | — | — | — |
| 10 | NC | — | — | — | — | — | — | — | — |
| 11 | NC | — | — | — | — | — | — | — | — |
| 12 | NC | — | — | — | — | — | — | — | — |
| 13 | NC | — | — | — | — | — | — | — | — |
| 14 | NC | — | — | — | — | — | — | — | — |
| 15 | NC | — | — | — | — | — | — | — | — |
| 16 | NC | — | — | — | — | — | — | — | — |
RLY1-R
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| COIL+ | Relay coil positive (switched +12 V) | — | W34 | — | 0.5 | SP-14V-1 | — | — | — |
| COIL- | Relay coil negative (ECU low-side driver) | — | W35 | — | 0.5 | MICROSQUIRT-A-16 | — | — | — |
| IN | Relay contact input (switched +12 V) | — | W33 | — | 0.5 | SP-14V-1 | — | — | — |
| OUT | Relay contact output (switched +12 V to load) | — | W32 | — | 0.5 | OEM-B-12 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W15 | — | 0.5 | MICROSQUIRT-A-19 | — | — | — |
| 1 | — | — | W10 | — | 0.5 | OEM-C-18 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-C-30 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-C-31 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-C-7 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | MICROSQUIRT-A-18 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | MICROSQUIRT-A-20 | — | — | — |
| 1 | — | — | W21 | — | 0.5 | OEM-C-9 | — | — | — |
| 1 | — | — | W23 | — | 0.5 | OEM-C-21 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-B-1 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-B-9 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | MICROSQUIRT-A-1 | — | — | — |
| 1 | — | — | W33 | — | 0.5 | RLY1-R-IN | — | — | — |
| 1 | — | — | W34 | — | 0.5 | RLY1-R-COIL+ | — | — | — |
SP-5V1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W17 | — | 0.5 | OEM-C-19 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | OEM-C-28 | — | — | — |
| 1 | — | — | W19 | — | 0.5 | MICROSQUIRT-A-28 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 0.85 | OEM-B-10 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-B-2 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-B-20 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-B-22 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | MICROSQUIRT-A-22 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | MICROSQUIRT-A-23 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-A-1 | Coolant temp gauge drive | low_side_out | — | — | — | corroborated | |
| OEM-A-10 | Service check signal | — | — | — | — | single_source | |
| OEM-A-11 | NC | — | — | — | — | unverified | |
| OEM-A-12 | Immobilizer indicator light | low_side_out | — | — | — | single_source | |
| OEM-A-13 | Immobilizer enable signal | — | — | — | — | single_source | |
| OEM-A-14 | NC | — | — | — | — | unverified | |
| OEM-A-15 | Fuel pump relay (USDM) | low_side_out | MICROSQUIRT-A-8 | FP (pump) | low_side_out | corroborated | |
| OEM-A-16 | Fuel pump relay (JDM) | low_side_out | MICROSQUIRT-A-17 | WLED | low_side_out | single_source | |
| OEM-A-17 | A/C clutch relay | low_side_out | MICROSQUIRT-A-7 | FIDLE | low_side_out | corroborated | |
| OEM-A-18 | Check engine light (MIL) | low_side_out | — | — | — | corroborated | |
| OEM-A-19 | Tacho output | tacho_out | MICROSQUIRT-A-35 | TACHO | tacho_out | corroborated | |
| OEM-A-2 | Air control valve solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-20 | Radiator fan relay | low_side_out | — | — | — | corroborated | |
| OEM-A-21 | K-Line | serial | — | — | — | single_source | |
| OEM-A-22 | NC | — | — | — | — | unverified | |
| OEM-A-23 | Secondary O2 sensor | lambda_nb_in | MICROSQUIRT-A-34 | O2 | lambda_nb_in | single_source | |
| OEM-A-24 | Starter switch signal | digital_in | MICROSQUIRT-A-6 | FLEX | digital_in | corroborated | |
| OEM-A-25 | Immobilizer code | — | — | — | — | single_source | |
| OEM-A-26 | Power steering load detect | digital_in | — | — | — | corroborated | |
| OEM-A-27 | A/C switch (request) | digital_in | — | — | — | corroborated | |
| OEM-A-28 | Air pump relay | low_side_out | — | — | — | corroborated | |
| OEM-A-29 | Fuel tank pressure sensor | analog_in | — | — | — | corroborated | |
| OEM-A-3 | Evap bypass solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-30 | Electrical load detector | analog_in | — | — | — | corroborated | |
| OEM-A-31 | NC | — | — | — | — | unverified | |
| OEM-A-32 | Brake switch | digital_in | — | — | — | corroborated | |
| OEM-A-4 | Evap canister vent shut valve | low_side_out | — | — | — | single_source | |
| OEM-A-5 | NC | — | — | — | — | unverified | |
| OEM-A-6 | Evap canister purge valve | low_side_out | — | — | — | single_source | |
| OEM-A-7 | NC | — | — | — | — | unverified | |
| OEM-A-8 | NC | — | — | — | — | unverified | |
| OEM-A-9 | Vehicle speed sensor | digital_in | MICROSQUIRT-A-30 | OPTO+ | digital_in | corroborated | |
| OEM-B-1 | Power source 1 (main relay) | power_in | MICROSQUIRT-A-1 + RLY1-R-COIL+ + RLY1-R-IN | +12V In + Relay coil positive (switched +12 V) + Relay contact input (switched +12 V) | power_in + power_out | corroborated | |
| OEM-B-10 | Power ground 2 | ground | MICROSQUIRT-A-22 + MICROSQUIRT-A-23 | POWER GROUND + POWER GROUND | ground | single_source | |
| OEM-B-11 | Injector 1 | injector_out | MICROSQUIRT-A-9 | INJ 1 | injector_out | corroborated | |
| OEM-B-12 | VTEC solenoid | high_side_out | RLY1-R-OUT | Relay contact output (switched +12 V to load) | power_out | corroborated | |
| OEM-B-13 | NC | — | — | — | — | unverified | |
| OEM-B-14 | NC | — | — | — | — | unverified | |
| OEM-B-15 | NC | — | — | — | — | unverified | |
| OEM-B-16 | NC | — | — | — | — | unverified | |
| OEM-B-17 | NC | — | — | — | — | unverified | |
| OEM-B-18 | NC | — | — | — | — | unverified | |
| OEM-B-19 | NC | — | — | — | — | unverified | |
| OEM-B-2 | Power ground 1 | ground | MICROSQUIRT-A-22 + MICROSQUIRT-A-23 | POWER GROUND + POWER GROUND | ground | corroborated | |
| OEM-B-20 | Ground | ground | MICROSQUIRT-A-22 + MICROSQUIRT-A-23 | POWER GROUND + POWER GROUND | ground | single_source | |
| OEM-B-21 | Backup power (battery constant) | power_in | — | — | — | single_source | |
| OEM-B-22 | Ground | ground | MICROSQUIRT-A-22 + MICROSQUIRT-A-23 | POWER GROUND + POWER GROUND | ground | single_source | |
| OEM-B-23 | Idle air control valve | low_side_out | — | — | — | corroborated | |
| OEM-B-24 | NC | — | — | — | — | unverified | |
| OEM-B-25 | NC | — | — | — | — | unverified | |
| OEM-B-3 | Injector 2 | injector_out | MICROSQUIRT-A-10 | INJ 2 | injector_out | corroborated | |
| OEM-B-4 | Injector 3 | injector_out | MICROSQUIRT-A-9 | INJ 1 | injector_out | corroborated | |
| OEM-B-5 | Injector 4 | injector_out | MICROSQUIRT-A-10 | INJ 2 | injector_out | corroborated | |
| OEM-B-6 | NC | — | — | — | — | unverified | |
| OEM-B-7 | NC | — | — | — | — | unverified | |
| OEM-B-8 | NC | — | — | — | — | unverified | |
| OEM-B-9 | Power source 2 (main relay) | power_in | MICROSQUIRT-A-1 + RLY1-R-COIL+ + RLY1-R-IN | +12V In + Relay coil positive (switched +12 V) + Relay contact input (switched +12 V) | power_in + power_out | corroborated | |
| OEM-C-1 | Primary O2 heater | low_side_out | — | — | — | corroborated | |
| OEM-C-10 | VTEC pressure switch | digital_in | — | — | — | corroborated | |
| OEM-C-11 | Secondary O2 heater control | low_side_out | — | — | — | single_source | |
| OEM-C-12 | Ignition coil 2 | ignition_out | MICROSQUIRT-A-12 | SPK A (IGN 1) | ignition_out | corroborated | |
| OEM-C-13 | Ignition coil 3 | ignition_out | — | — | — | corroborated | |
| OEM-C-14 | Ignition coil 4 | ignition_out | — | — | — | corroborated | |
| OEM-C-15 | Secondary O2 sensor | lambda_nb_in | MICROSQUIRT-A-5 | SPAREADC2 (MAF) | analog_in | corroborated | |
| OEM-C-16 | Primary O2 sensor | lambda_nb_in | MICROSQUIRT-A-29 | SPAREADC | analog_in | corroborated | |
| OEM-C-17 | MAP sensor | analog_in | MICROSQUIRT-A-24 | MAP | analog_in | corroborated | |
| OEM-C-18 | Sensor ground 2 | sensor_ground | MICROSQUIRT-A-18 + MICROSQUIRT-A-19 + MICROSQUIRT-A-20 | Sensor Ground + Serial Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-C-19 | Sensor 5V supply 1 (MAP) | vref | MICROSQUIRT-A-28 | TPS VREF (5V) | vref | corroborated | |
| OEM-C-2 | Alternator control | low_side_out | — | — | — | single_source | |
| OEM-C-20 | Cam (TDC1) sensor + | trigger_in | MICROSQUIRT-A-4 | VR2+ | trigger_in | corroborated | |
| OEM-C-21 | Cam (TDC1) sensor − | trigger_in | MICROSQUIRT-A-18 + MICROSQUIRT-A-19 + MICROSQUIRT-A-20 | Sensor Ground + Serial Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-C-22 | Knock sensor | knock_in | — | — | — | conflict | |
| OEM-C-23 | NC | — | — | — | — | unverified | |
| OEM-C-24 | Air pump electric current sensor | analog_in | — | — | — | single_source | |
| OEM-C-25 | Intake air temp sensor | temp_in | MICROSQUIRT-A-26 | MAT | temp_in | corroborated | |
| OEM-C-26 | Coolant temp sensor | temp_in | MICROSQUIRT-A-25 | CLT | temp_in | corroborated | |
| OEM-C-27 | Throttle position sensor | analog_in | MICROSQUIRT-A-27 | TPS | analog_in | corroborated | |
| OEM-C-28 | Sensor 5V supply 2 | vref | MICROSQUIRT-A-28 | TPS VREF (5V) | vref | corroborated | |
| OEM-C-29 | Cam (TDC2) sensor + | trigger_in | MICROSQUIRT-A-21 | VR2- | trigger_in | corroborated | |
| OEM-C-3 | Knock sensor | knock_in | — | — | — | conflict | |
| OEM-C-30 | Cam (TDC2) sensor − | sensor_ground | MICROSQUIRT-A-18 + MICROSQUIRT-A-19 + MICROSQUIRT-A-20 | Sensor Ground + Serial Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-C-31 | Timing ground | sensor_ground | MICROSQUIRT-A-18 + MICROSQUIRT-A-19 + MICROSQUIRT-A-20 | Sensor Ground + Serial Ground + Sensor Ground | sensor_ground | single_source | |
| OEM-C-4 | Ignition coil 1 | ignition_out | MICROSQUIRT-A-11 | SPK B (IGN2) | ignition_out | corroborated | |
| OEM-C-5 | Alternator FR signal | digital_in | MICROSQUIRT-A-31 | OPTO- | digital_in | single_source | |
| OEM-C-6 | NC | — | — | — | — | unverified | |
| OEM-C-7 | Sensor ground 1 | sensor_ground | MICROSQUIRT-A-18 + MICROSQUIRT-A-19 + MICROSQUIRT-A-20 | Sensor Ground + Serial Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-C-8 | Crank sensor + (CKP+) | trigger_in | MICROSQUIRT-A-32 | VR1+ | trigger_in | corroborated | |
| OEM-C-9 | Crank sensor − (CKP−) | trigger_in | MICROSQUIRT-A-18 + MICROSQUIRT-A-19 + MICROSQUIRT-A-20 | Sensor Ground + Serial Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-D-1 | NC | — | — | — | — | unverified | |
| OEM-D-10 | NC | — | — | — | — | unverified | |
| OEM-D-11 | NC | — | — | — | — | unverified | |
| OEM-D-12 | NC | — | — | — | — | unverified | |
| OEM-D-13 | NC | — | — | — | — | unverified | |
| OEM-D-14 | NC | — | — | — | — | unverified | |
| OEM-D-15 | NC | — | — | — | — | unverified | |
| OEM-D-16 | NC | — | — | — | — | unverified | |
| OEM-D-2 | NC | — | — | — | — | unverified | |
| OEM-D-3 | NC | — | — | — | — | unverified | |
| OEM-D-4 | NC | — | — | — | — | unverified | |
| OEM-D-5 | NC | — | — | — | — | unverified | |
| OEM-D-6 | NC | — | — | — | — | unverified | |
| OEM-D-7 | NC | — | — | — | — | unverified | |
| OEM-D-8 | NC | — | — | — | — | unverified | |
| OEM-D-9 | NC | — | — | — | — | unverified |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-B-1 | SP-14V-1 | 0.85 | no route | Power source 1 (main relay) | — | |
| W2 | OEM-B-9 | SP-14V-1 | 0.85 | no route | Power source 2 (main relay) | — | |
| W3 | SP-14V-1 | MICROSQUIRT-A-1 | 0.85 | no route | +12V In | — | |
| W4 | OEM-B-10 | SP-GND-1 | 0.85 | no route | Power ground 2 | — | |
| W5 | OEM-B-2 | SP-GND-1 | 0.85 | no route | Power ground 1 | — | |
| W6 | OEM-B-20 | SP-GND-1 | 0.85 | no route | Ground | — | |
| W7 | OEM-B-22 | SP-GND-1 | 0.85 | no route | Ground | — | |
| W8 | SP-GND-1 | MICROSQUIRT-A-22 | 0.85 | no route | POWER GROUND | — | |
| W9 | SP-GND-1 | MICROSQUIRT-A-23 | 0.85 | no route | POWER GROUND | — | |
| W10 | OEM-C-18 | SP-0V-1 | 0.5 | no route | Sensor ground 2 | — | |
| W11 | OEM-C-30 | SP-0V-1 | 0.5 | no route | Cam (TDC2) sensor − | — | |
| W12 | OEM-C-31 | SP-0V-1 | 0.5 | no route | Timing ground | — | |
| W13 | OEM-C-7 | SP-0V-1 | 0.5 | no route | Sensor ground 1 | — | |
| W14 | SP-0V-1 | MICROSQUIRT-A-18 | 0.5 | no route | Sensor Ground | — | |
| W15 | SP-0V-1 | MICROSQUIRT-A-19 | 0.5 | no route | Serial Ground | — | |
| W16 | SP-0V-1 | MICROSQUIRT-A-20 | 0.5 | no route | Sensor Ground | — | |
| W17 | OEM-C-19 | SP-5V1-1 | 0.5 | no route | Sensor 5V supply 1 (MAP) | — | |
| W18 | OEM-C-28 | SP-5V1-1 | 0.5 | no route | Sensor 5V supply 2 | — | |
| W19 | SP-5V1-1 | MICROSQUIRT-A-28 | 0.5 | no route | TPS VREF (5V) | — | |
| W20 | OEM-C-8 | MICROSQUIRT-A-32 | 0.5 | no route | Crank sensor + (CKP+) | — | |
| W21 | OEM-C-9 | SP-0V-1 | 0.5 | no route | Crank sensor − (CKP−) | — | |
| W22 | OEM-C-20 | MICROSQUIRT-A-4 | 0.5 | no route | Cam (TDC1) sensor + | — | |
| W23 | OEM-C-21 | SP-0V-1 | 0.5 | no route | Cam (TDC1) sensor − | — | |
| W24 | OEM-C-29 | MICROSQUIRT-A-21 | 0.5 | no route | Cam (TDC2) sensor + | — | |
| W25 | OEM-C-4 | MICROSQUIRT-A-11 | 0.5 | no route | Ignition coil 1 | — | |
| W26 | OEM-C-12 | MICROSQUIRT-A-12 | 0.5 | no route | Ignition coil 2 | — | |
| W27 | OEM-B-11 | MICROSQUIRT-A-9 | 0.5 | no route | Injector 1 | — | |
| W28 | OEM-B-3 | MICROSQUIRT-A-10 | 0.5 | no route | Injector 2 | — | |
| W29 | OEM-B-4 | MICROSQUIRT-A-9 | 0.5 | no route | Injector 3 | — | |
| W30 | OEM-B-5 | MICROSQUIRT-A-10 | 0.5 | no route | Injector 4 | — | |
| W31 | OEM-A-15 | MICROSQUIRT-A-8 | 0.5 | no route | Fuel pump relay (USDM) | — | |
| W32 | OEM-B-12 | RLY1-R-OUT | 0.5 | no route | VTEC solenoid | — | |
| W33 | SP-14V-1 | RLY1-R-IN | 0.5 | no route | Relay contact input (switched +12 V) | — | |
| W34 | SP-14V-1 | RLY1-R-COIL+ | 0.5 | no route | Relay coil positive (switched +12 V) | — | |
| W35 | RLY1-R-COIL- | MICROSQUIRT-A-16 | 0.5 | no route | Relay coil negative (ECU low-side driver) | — | |
| W36 | OEM-C-17 | MICROSQUIRT-A-24 | 0.5 | no route | MAP sensor | — | |
| W37 | OEM-C-27 | MICROSQUIRT-A-27 | 0.5 | no route | Throttle position sensor | — | |
| W38 | OEM-C-26 | MICROSQUIRT-A-25 | 0.5 | no route | Coolant temp sensor | — | |
| W39 | OEM-A-16 | MICROSQUIRT-A-17 | 0.5 | no route | Fuel pump relay (JDM) | — | |
| W40 | OEM-A-17 | MICROSQUIRT-A-7 | 0.5 | no route | A/C clutch relay | — | |
| W41 | OEM-A-19 | MICROSQUIRT-A-35 | 0.5 | no route | Tacho output | — | |
| W42 | OEM-A-23 | MICROSQUIRT-A-34 | 0.5 | no route | Secondary O2 sensor | — | |
| W43 | OEM-C-15 | MICROSQUIRT-A-5 | 0.5 | no route | Secondary O2 sensor | — | |
| W44 | OEM-C-16 | MICROSQUIRT-A-29 | 0.5 | no route | Primary O2 sensor | — | |
| W45 | OEM-C-25 | MICROSQUIRT-A-26 | 0.5 | no route | Intake air temp sensor | — | |
| W46 | OEM-A-9 | MICROSQUIRT-A-30 | 0.5 | no route | Vehicle speed sensor | — | |
| W47 | OEM-C-5 | MICROSQUIRT-A-31 | 0.5 | no route | Alternator FR signal | — | |
| W48 | OEM-A-24 | MICROSQUIRT-A-6 | 0.5 | no route | Starter switch signal | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| connector | 179679-6 | TE | S2000 2000–05 ECU harness plug B (25P, TE 040 Multi-Lock) | 1.000 | ea |
| connector | 179680-5 | TE | S2000 2000–05 ECU harness plug C (31P, TE 040 Multi-Lock) | 1.000 | ea |
| connector | 179681-6 | TE | S2000 2000–05 ECU harness plug A (32P, TE 040 Multi-Lock) | 1.000 | ea |
| connector | S2K-0005-ECU-D | Honda | S2000 2000–05 ECU plug D (P/N unknown) | 1.000 | ea |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (8)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | NET_MERGED | MICROSQUIRT-A-10 + OEM-B-3 + OEM-B-5 | 2 different OEM functions share one net: OEM-B-3 Injector 2; OEM-B-5 Injector 4 |
| error | NET_MERGED | MICROSQUIRT-A-9 + OEM-B-11 + OEM-B-4 | 2 different OEM functions share one net: OEM-B-11 Injector 1; OEM-B-4 Injector 3 |
| error | REQUIRED_UNMAPPED | OEM-C-13 | Required OEM function "Ignition coil 3" (ignition_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-C-14 | Required OEM function "Ignition coil 4" (ignition_out) is not connected to the new ECU. |
| warn | LOAD_UNKNOWN | RLY1-R-OUT | RLY1-R-OUT "Relay contact output (switched +12 V to load)" drives OEM-B-12 VTEC solenoid (load 1.0 A) but its current rating is unknown. Check the ECU manual. |
| warn | SUPPLY_GROUP | MICROSQUIRT-A-28 + OEM-C-19 + OEM-C-28 + SP-5V1-1 | Supplies meant to stay independent share one net: OEM-C-19 [s2k_vcc1], OEM-C-28 [s2k_vcc2]. The new ECU has no free 5 V reference, so they share one: normal on a standalone, but a short on any of these sensors drops them all. |
| info | NET_FAMILY | OEM-C-21 ↔ MICROSQUIRT-A-20 | OEM-C-21 "Cam (TDC1) sensor −" [trigger_in] is wired to MICROSQUIRT-A-20 "Sensor Ground" [sensor_ground]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs. |
| info | UNMAPPED | OEM | 27 optional OEM pins are not mapped: OEM-A-1 Coolant temp gauge drive; OEM-A-10 Service check signal; OEM-A-12 Immobilizer indicator light; OEM-A-13 Immobilizer enable signal; OEM-A-18 Check engine light (MIL); OEM-A-2 Air control valve solenoid; OEM-A-20 Radiator fan relay; OEM-A-21 K-Line; OEM-A-25 Immobilizer code; OEM-A-26 Power steering load detect; OEM-A-27 A/C switch (request); OEM-A-28 Air pump relay; OEM-A-29 Fuel tank pressure sensor; OEM-A-3 Evap bypass solenoid; OEM-A-30 Electrical load detector; OEM-A-32 Brake switch; OEM-A-4 Evap canister vent shut valve; OEM-A-6 Evap canister purge valve; OEM-B-21 Backup power (battery constant); OEM-B-23 Idle air control valve; OEM-C-1 Primary O2 heater; OEM-C-10 VTEC pressure switch; OEM-C-11 Secondary O2 heater control; OEM-C-2 Alternator control; OEM-C-22 Knock sensor; OEM-C-24 Air pump electric current sensor; OEM-C-3 Knock sensor |
Accepted (0)
| Code | Subject | Reason | By |
|---|
Notes
Fit check: unconfirmed. Confirm these before building: - Trigger pattern for Honda F22C1 not found in the ECU's docs (Confirmed absent from documented trigger/decoder list. No F22C1/AP2 decoder in MS2/Extra (RC51 mode lists AP1 only), and the F22C1 cam pattern differs from AP1. Microsquirt also has only 2 injector/2 ignition outputs.) - No knock input; the stock knock sensor would be unused - Only 2 ignition outputs for 4 cylinders: wasted spark (pair coils per firing order) - Only 2 injector outputs for 4 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-C 13: Ignition coil 3: no free ignition output on AMP EFI Microsquirt - OEM-C 14: Ignition coil 4: no free ignition output on AMP EFI Microsquirt Not wired: - OEM-B 21: Backup power (battery constant): AMP EFI Microsquirt has no battery-constant input; not needed - OEM-C 22: Knock sensor: no free knock input on AMP EFI Microsquirt - OEM-C 3: Knock sensor: no free knock input on AMP EFI Microsquirt - OEM-A 20: Radiator fan relay: no free relay_control/low_side/heater_low_side/ls_hs/injector rated ≥ 0.2 A on AMP EFI Microsquirt - OEM-A 28: Air pump relay: no free relay_control/low_side/heater_low_side/ls_hs/injector rated ≥ 0.2 A on AMP EFI Microsquirt - OEM-C 1: Primary O2 heater: no free heater_low_side/low_side/relay_control/ls_hs/injector on AMP EFI Microsquirt - OEM-C 11: Secondary O2 heater control: no free heater_low_side/low_side/relay_control/ls_hs/injector on AMP EFI Microsquirt - OEM-B 23: Idle air control valve: no free low_side/relay_control/heater_low_side/ls_hs/injector rated ≥ 1.0 A on AMP EFI Microsquirt - OEM-A 1: Coolant temp gauge drive: no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI Microsquirt - OEM-A 12: Immobilizer indicator light: no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI Microsquirt - OEM-A 18: Check engine light (MIL): no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI Microsquirt - OEM-A 2: Air control valve solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI Microsquirt - OEM-A 3: Evap bypass solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI Microsquirt - OEM-A 4: Evap canister vent shut valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI Microsquirt - OEM-A 6: Evap canister purge valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI Microsquirt - OEM-C 2: Alternator control: no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI Microsquirt - OEM-A 29: Fuel tank pressure sensor: no free analog_0_5 on AMP EFI Microsquirt - OEM-A 30: Electrical load detector: no free analog_0_5 on AMP EFI Microsquirt - OEM-C 24: Air pump electric current sensor: no free analog_0_5 on AMP EFI Microsquirt - OEM-A 26: Power steering load detect: no free switch_in/frequency_in/analog_0_5 on AMP EFI Microsquirt - OEM-A 27: A/C switch (request): no free switch_in/frequency_in/analog_0_5 on AMP EFI Microsquirt - OEM-A 32: Brake switch: no free switch_in/frequency_in/analog_0_5 on AMP EFI Microsquirt - OEM-C 10: VTEC pressure switch: no free switch_in/frequency_in/analog_0_5 on AMP EFI Microsquirt - OEM-A 21: K-Line: no free k_line on AMP EFI Microsquirt - OEM-A 10: Service check signal: not classified in the library; wire by hand - OEM-A 13: Immobilizer enable signal: not classified in the library; wire by hand - OEM-A 25: Immobilizer code: not classified in the library; wire by hand
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | AEM 30-6052 Series 2 Plug & Play EMS, 2000–2005 S2000 (original ECU pinout) | https://documents.aemelectronics.com/techlibrary_30-6052_series_2_plug___play_ems.pdf | — | 2026-10-05 | 9f79620fff5a |
| 4 | vendor_doc | 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 | Haltech KB: F20C (AP1) engine | https://support.haltech.com/portal/en/kb/articles/f20c-ap1-engine | — | 2026-10-05 | e804da29d014 |
| 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 | Link S2000 AP1 PlugIn installation manual | https://linkecu.com/documentation/S2000X.pdf | — | 2026-10-05 | d12b0ff3f006 |
| 4 | vendor_doc | MSExtra: Microsquirt hardware 3.4 | http://www.msextra.com/doc/pdf/Microsquirt_Hardware-3.4.pdf | archive | 2026-10-05 | ad920d9160de |
| 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 |
| 2 | forum | AllPinouts: 2000–2005 Honda S2000 ECU | https://allpinouts.org/pinouts/connectors/car/2000-2005-honda-s2000-ecu/ | archive | 2026-10-05 | 81d874e0385d |
| 2 | forum | Autodata blog: ECU Pinout Honda S2000 2000-2004 | http://autodatas.blogspot.com/2012/11/ecu-pinout-honda-s2000-2000-2004.html | — | 2026-10-05 | 33b93af7640e |
| 2 | derived | Typical load estimates (relay coil ~0.2 A, high-Z injector ~1.2 A, VVT solenoid ~1 A) | — | — | — | — |