Testing Simple loom 2
Emtron — SL4
⚠ NOT CHECKED. Don't build from this.
Drawn by [email protected] · Rev 0 · draft · 2026-10-08
Before you start
| Status | draft · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | 1: read the Findings page before cutting any wire |
| Size of the job | 67 wires · 31 connectors · 13 part lines |
| Tools | Crimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink |
| Terminals | 3-1447221-4 |
| 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 | CKP-VCC | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | CMP-A-VCC | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | CMP-B-VCC | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | COIL1-12V | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | COIL2-12V | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | COIL3-12V | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | COIL4-12V | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | IACV-12V | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | INJ1-12V | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | INJ2-12V | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | INJ3-12V | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | INJ4-12V | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | O2-HTR+ | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | VTEC-12V | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-14V-1 | SL4-A-34 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-14V-1 | SL4-B-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | COIL1-GND | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | COIL2-GND | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | COIL3-GND | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | COIL4-GND | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | SP-GND-1 | SL4-B-18 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | SP-GND-1 | SL4-B-26 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | CKP-GND | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | CMP-A-GND | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | CMP-B-GND | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | ECT-GND | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | IAT-GND | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | MAP-GND | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | O2-GND | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | TPS-GND | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | VTPSW-GND | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | SP-0V-1 | SL4-B-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | MAP-VCC | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | TPS-VCC | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | SP-5V1-1 | SL4-B-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | CKP-SIG | SL4-B-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | SP-0V-1 | SL4-B-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | CMP-A-SIG | SL4-B-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | SP-0V-1 | SL4-B-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | KS-SIG | SL4-B-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | COIL1-TRG | SL4-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | COIL2-TRG | SL4-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | COIL3-TRG | SL4-A-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | COIL4-TRG | SL4-A-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | INJ1-SIG | SL4-A-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | INJ2-SIG | SL4-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | INJ3-SIG | SL4-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | INJ4-SIG | SL4-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | VTC-B | SL4-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W51 | VTC-A | SL4-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W52 | NEW-IGN-1 | SL4-B-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W53 | RLY-COIL- | SL4-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W54 | O2-HTR | SL4-A-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W55 | IACV-A | SL4-A-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W56 | VTEC-SIG | SL4-A-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W57 | MAP-SIG | SL4-B-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W58 | TPS-SIG | SL4-B-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W59 | O2-SIG | SL4-B-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W60 | ECT-SIG | SL4-B-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W61 | IAT-SIG | SL4-B-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W62 | VTPSW-SIG | SL4-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W63 | CMP-B-SIG | SL4-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W64 | BAT-+ | F1-1 | 3.0 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W65 | F1-2 | RLY-IN | 3.0 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W66 | RLY-OUT | SP-14V-1 | 3.0 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W67 | BAT-- | SP-GND-1 | 3.0 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W68 | NEW-IGN-1 | RLY-COIL+ | 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 | CKP-VCC | BAT-- | open (OL) | +12 V supply must not touch power ground | |
| 2 | CKP-VCC | CKP-GND | open (OL) | +12 V supply must not touch sensor ground | |
| 3 | MAP-VCC | BAT-- | open (OL) | 5 V sensor reference must not touch power ground | |
| 4 | MAP-VCC | CKP-GND | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 5 | NEW-IGN-1 | BAT-- | open (OL) | +12 V supply must not touch power ground | |
| 6 | NEW-IGN-1 | CKP-GND | open (OL) | +12 V supply must not touch sensor ground | |
| 7 | BAT-- | F1-1 | open (OL) | power ground must not touch +12 V supply | |
| 8 | BAT-- | F1-2 | open (OL) | power ground must not touch +12 V supply | |
| 9 | CKP-GND | F1-1 | open (OL) | sensor ground must not touch +12 V supply | |
| 10 | CKP-GND | F1-2 | open (OL) | sensor ground must not touch +12 V supply | |
| 11 | CKP-VCC | MAP-VCC | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 12 | MAP-VCC | F1-1 | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 13 | MAP-VCC | F1-2 | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 14 | MAP-VCC | NEW-IGN-1 | open (OL) | 5 V sensor reference must not touch +12 V supply |
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
BAT
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| + | Battery positive | — | W64 | — | 3.0 | F1-1 | — | — | — |
| - | Battery negative / chassis ground | — | W67 | — | 3.0 | SP-GND-1 | — | — | — |
CKP
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | CKP signal | — | W37 | — | 0.5 | SL4-B-5 | — | — | — |
| VCC | CKP +12V | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| GND | CKP sensor ground | — | W23 | — | 0.5 | SP-0V-1 | — | — | — |
CMP-A
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | CMP signal | — | W39 | — | 0.5 | SL4-B-7 | — | — | — |
| VCC | CMP +12V | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| GND | CMP sensor ground | — | W24 | — | 0.5 | SP-0V-1 | — | — | — |
CMP-B
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | CMP signal | — | W63 | — | 0.5 | SL4-A-21 | — | — | — |
| VCC | CMP +12V | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| GND | CMP sensor ground | — | W25 | — | 0.5 | SP-0V-1 | — | — | — |
COIL1
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| TRG | Igniter trigger | — | W42 | — | 0.5 | SL4-A-26 | — | — | — |
| 12V | Coil +12V | — | W4 | — | 0.85 | SP-14V-1 | — | — | — |
| GND | Coil ground | — | W17 | — | 0.85 | SP-GND-1 | — | — | — |
COIL2
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| TRG | Igniter trigger | — | W43 | — | 0.5 | SL4-A-27 | — | — | — |
| 12V | Coil +12V | — | W5 | — | 0.85 | SP-14V-1 | — | — | — |
| GND | Coil ground | — | W18 | — | 0.85 | SP-GND-1 | — | — | — |
COIL3
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| TRG | Igniter trigger | — | W44 | — | 0.5 | SL4-A-28 | — | — | — |
| 12V | Coil +12V | — | W6 | — | 0.85 | SP-14V-1 | — | — | — |
| GND | Coil ground | — | W19 | — | 0.85 | SP-GND-1 | — | — | — |
COIL4
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| TRG | Igniter trigger | — | W45 | — | 0.5 | SL4-A-29 | — | — | — |
| 12V | Coil +12V | — | W7 | — | 0.85 | SP-14V-1 | — | — | — |
| GND | Coil ground | — | W20 | — | 0.85 | SP-GND-1 | — | — | — |
ECT
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | ECT signal | — | W60 | — | 0.5 | SL4-B-14 | — | — | — |
| GND | ECT sensor ground | — | W26 | — | 0.5 | SP-0V-1 | — | — | — |
F1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W64 | — | 3.0 | BAT-+ | — | — | — |
| 2 | — | — | W65 | — | 3.0 | RLY-IN | — | — | — |
IACV
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | IACV low side (coil A) | — | W55 | — | 0.5 | SL4-A-17 | — | — | — |
| 12V | IACV +12V | — | W8 | — | 0.85 | SP-14V-1 | — | — | — |
| B | IACV low side (coil B) | — | — | — | — | — | — | — | — |
IAT
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | IAT signal | — | W61 | — | 0.5 | SL4-B-15 | — | — | — |
| GND | IAT sensor ground | — | W27 | — | 0.5 | SP-0V-1 | — | — | — |
INJ1
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | Injector low side | — | W46 | — | 0.5 | SL4-A-1 | — | — | — |
| 12V | Injector +12V (main relay) | — | W9 | — | 0.85 | SP-14V-1 | — | — | — |
INJ2
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | Injector low side | — | W47 | — | 0.5 | SL4-A-2 | — | — | — |
| 12V | Injector +12V (main relay) | — | W10 | — | 0.85 | SP-14V-1 | — | — | — |
INJ3
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | Injector low side | — | W48 | — | 0.5 | SL4-A-3 | — | — | — |
| 12V | Injector +12V (main relay) | — | W11 | — | 0.85 | SP-14V-1 | — | — | — |
INJ4
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | Injector low side | — | W49 | — | 0.5 | SL4-A-4 | — | — | — |
| 12V | Injector +12V (main relay) | — | W12 | — | 0.85 | SP-14V-1 | — | — | — |
KS
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | Knock signal | — | W41 | — | 0.5 | SL4-B-16 | — | — | — |
MAP
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | MAP signal | — | W57 | — | 0.5 | SL4-B-11 | — | — | — |
| VCC | MAP 5V supply | — | W34 | — | 0.5 | SP-5V1-1 | — | — | — |
| GND | MAP sensor ground | — | W29 | — | 0.5 | SP-0V-1 | — | — | — |
NEW-IGN
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W52 | — | 0.5 | SL4-B-4 | — | — | — |
| 1 | — | — | W68 | — | 0.5 | RLY-COIL+ | — | — | — |
O2
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | Secondary O2 signal | — | W59 | — | 0.5 | SL4-B-13 | — | — | — |
| GND | O2 signal ground | — | W30 | — | 0.5 | SP-0V-1 | — | — | — |
| HTR | O2 heater low side | — | W54 | — | 0.5 | SL4-A-16 | — | — | — |
| HTR+ | O2 heater supply | — | W13 | — | 0.85 | SP-14V-1 | — | — | — |
RLY
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| COIL+ | Relay coil positive (ignition-switched +12V) | — | W68 | — | 0.5 | NEW-IGN-1 | — | — | — |
| COIL- | Relay coil negative (ECU low-side driver) | — | W53 | — | 0.5 | SL4-A-14 | — | — | — |
| IN | Relay contact input (battery + via main fuse) | — | W65 | — | 3.0 | F1-2 | — | — | — |
| OUT | Relay contact output (switched +12V bus) | — | W66 | — | 3.0 | SP-14V-1 | — | — | — |
SL4-A
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injection channel 1 | — | W46 | — | 0.5 | INJ1-SIG | — | — | — |
| 2 | Injection channel 2 | — | W47 | — | 0.5 | INJ2-SIG | — | — | — |
| 3 | Injection channel 3 | — | W48 | — | 0.5 | INJ3-SIG | — | — | — |
| 4 | Injection channel 4 | — | W49 | — | 0.5 | INJ4-SIG | — | — | — |
| 5 | NC | — | — | — | — | — | — | — | — |
| 6 | NC | — | — | — | — | — | — | — | — |
| 7 | NC | — | — | — | — | — | — | — | — |
| 8 | NC | — | — | — | — | — | — | — | — |
| 9 | Sensor supply 8V | — | — | — | — | — | — | — | — |
| 10 | Auxiliary output 1 | — | W56 | — | 0.5 | VTEC-SIG | — | — | — |
| 11 | Auxiliary output 2 | — | — | — | — | — | — | — | — |
| 12 | Auxiliary output 3 | — | — | — | — | — | — | — | — |
| 13 | Auxiliary output 4 | — | — | — | — | — | — | — | — |
| 14 | Auxiliary output 5 | — | W53 | — | 0.5 | RLY-COIL- | — | — | — |
| 15 | Auxiliary output 6 | — | — | — | — | — | — | — | — |
| 16 | Auxiliary output 7 | — | W54 | — | 0.5 | O2-HTR | — | — | — |
| 17 | Auxiliary output 8 | — | W55 | — | 0.5 | IACV-A | — | — | — |
| 18 | Auxiliary output 9 | — | W51 | — | 0.5 | VTC-A | — | — | — |
| 19 | Auxiliary output 10 | — | W50 | — | 0.5 | VTC-B | — | — | — |
| 20 | Digital input 1 | — | W62 | — | 0.5 | VTPSW-SIG | — | — | — |
| 21 | Digital input 2 | — | W63 | — | 0.5 | CMP-B-SIG | — | — | — |
| 22 | Digital input 3 | — | — | — | — | — | — | — | — |
| 23 | Digital input 4 | — | — | — | — | — | — | — | — |
| 24 | Digital input 5 | — | — | — | — | — | — | — | — |
| 25 | Digital input 6 | — | — | — | — | — | — | — | — |
| 26 | Ignition channel 1 | — | W42 | — | 0.5 | COIL1-TRG | — | — | — |
| 27 | Ignition channel 2 | — | W43 | — | 0.5 | COIL2-TRG | — | — | — |
| 28 | Ignition channel 3 | — | W44 | — | 0.5 | COIL3-TRG | — | — | — |
| 29 | Ignition channel 4 | — | W45 | — | 0.5 | COIL4-TRG | — | — | — |
| 30 | NC | — | — | — | — | — | — | — | — |
| 31 | NC | — | — | — | — | — | — | — | — |
| 32 | NC | — | — | — | — | — | — | — | — |
| 33 | NC | — | — | — | — | — | — | — | — |
| 34 | Aux 9–10 14V supply | — | W15 | — | 0.85 | SP-14V-1 | — | — | — |
SL4-B
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | ECU 14V supply | — | W16 | — | 0.85 | SP-14V-1 | — | — | — |
| 2 | Sensor supply Vref1 5.0V | — | W36 | — | 0.5 | SP-5V1-1 | — | — | — |
| 3 | EFI relay output (low side, 200 mA) | — | — | — | — | — | — | — | — |
| 4 | Ignition switch input | — | W52 | — | 0.5 | NEW-IGN-1 | — | — | — |
| 5 | Crank index sensor + | — | W37 | — | 0.5 | CKP-SIG | — | — | — |
| 6 | Crank index sensor − | — | W38 | — | 0.5 | SP-0V-1 | — | — | — |
| 7 | Sync sensor + | — | W39 | — | 0.5 | CMP-A-SIG | — | — | — |
| 8 | Sync sensor − | — | W40 | — | 0.5 | SP-0V-1 | — | — | — |
| 9 | Shield (crank/sync/knock) | — | — | — | — | — | — | — | — |
| 10 | Analog sensor 0V reference | — | W33 | — | 0.5 | SP-0V-1 | — | — | — |
| 11 | Analog input 1 | — | W57 | — | 0.5 | MAP-SIG | — | — | — |
| 12 | Analog input 2 | — | W58 | — | 0.5 | TPS-SIG | — | — | — |
| 13 | Analog input 3 | — | W59 | — | 0.5 | O2-SIG | — | — | — |
| 14 | Analog input 4 | — | W60 | — | 0.5 | ECT-SIG | — | — | — |
| 15 | Analog input 5 | — | W61 | — | 0.5 | IAT-SIG | — | — | — |
| 16 | Knock 1 + | — | W41 | — | 0.5 | KS-SIG | — | — | — |
| 17 | Knock 1 − | — | — | — | — | — | — | — | — |
| 18 | ECU ground | — | W21 | — | 0.85 | SP-GND-1 | — | — | — |
| 19 | Analog input 6 | — | — | — | — | — | — | — | — |
| 20 | Analog input 7 (switchable 1k pull-up) | — | — | — | — | — | — | — | — |
| 21 | Analog input 8 (switchable 1k pull-up) | — | — | — | — | — | — | — | — |
| 22 | Analog input 9 (switchable 1k pull-up) | — | — | — | — | — | — | — | — |
| 23 | Analog input 10 (switchable 1k pull-up) | — | — | — | — | — | — | — | — |
| 24 | Knock 2 + | — | — | — | — | — | — | — | — |
| 25 | Knock 2 − | — | — | — | — | — | — | — | — |
| 26 | ECU ground | — | W22 | — | 0.85 | SP-GND-1 | — | — | — |
| 27 | CAN 1 H | — | — | — | — | — | — | — | — |
| 28 | CAN 1 L | — | — | — | — | — | — | — | — |
| 29 | NC | — | — | — | — | — | — | — | — |
| 30 | NC | — | — | — | — | — | — | — | — |
| 31 | Ethernet Tx + | — | — | — | — | — | — | — | — |
| 32 | Ethernet Tx − | — | — | — | — | — | — | — | — |
| 33 | Ethernet Rx + | — | — | — | — | — | — | — | — |
| 34 | Ethernet Rx − | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W27 | — | 0.5 | IAT-GND | — | — | — |
| 1 | — | — | W29 | — | 0.5 | MAP-GND | — | — | — |
| 1 | — | — | W30 | — | 0.5 | O2-GND | — | — | — |
| 1 | — | — | W31 | — | 0.5 | TPS-GND | — | — | — |
| 1 | — | — | W32 | — | 0.5 | VTPSW-GND | — | — | — |
| 1 | — | — | W33 | — | 0.5 | SL4-B-10 | — | — | — |
| 1 | — | — | W38 | — | 0.5 | SL4-B-6 | — | — | — |
| 1 | — | — | W40 | — | 0.5 | SL4-B-8 | — | — | — |
| 1 | — | — | W23 | — | 0.5 | CKP-GND | — | — | — |
| 1 | — | — | W24 | — | 0.5 | CMP-A-GND | — | — | — |
| 1 | — | — | W25 | — | 0.5 | CMP-B-GND | — | — | — |
| 1 | — | — | W26 | — | 0.5 | ECT-GND | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W16 | — | 0.85 | SL4-B-1 | — | — | — |
| 1 | — | — | W1 | — | 0.85 | CKP-VCC | — | — | — |
| 1 | — | — | W2 | — | 0.85 | CMP-A-VCC | — | — | — |
| 1 | — | — | W3 | — | 0.85 | CMP-B-VCC | — | — | — |
| 1 | — | — | W4 | — | 0.85 | COIL1-12V | — | — | — |
| 1 | — | — | W5 | — | 0.85 | COIL2-12V | — | — | — |
| 1 | — | — | W6 | — | 0.85 | COIL3-12V | — | — | — |
| 1 | — | — | W7 | — | 0.85 | COIL4-12V | — | — | — |
| 1 | — | — | W8 | — | 0.85 | IACV-12V | — | — | — |
| 1 | — | — | W9 | — | 0.85 | INJ1-12V | — | — | — |
| 1 | — | — | W10 | — | 0.85 | INJ2-12V | — | — | — |
| 1 | — | — | W11 | — | 0.85 | INJ3-12V | — | — | — |
| 1 | — | — | W12 | — | 0.85 | INJ4-12V | — | — | — |
| 1 | — | — | W13 | — | 0.85 | O2-HTR+ | — | — | — |
| 1 | — | — | W14 | — | 0.85 | VTEC-12V | — | — | — |
| 1 | — | — | W15 | — | 0.85 | SL4-A-34 | — | — | — |
| 1 | — | — | W66 | — | 3.0 | RLY-OUT | — | — | — |
SP-5V1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W35 | — | 0.5 | TPS-VCC | — | — | — |
| 1 | — | — | W36 | — | 0.5 | SL4-B-2 | — | — | — |
| 1 | — | — | W34 | — | 0.5 | MAP-VCC | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W19 | — | 0.85 | COIL3-GND | — | — | — |
| 1 | — | — | W20 | — | 0.85 | COIL4-GND | — | — | — |
| 1 | — | — | W21 | — | 0.85 | SL4-B-18 | — | — | — |
| 1 | — | — | W22 | — | 0.85 | SL4-B-26 | — | — | — |
| 1 | — | — | W67 | — | 3.0 | BAT-- | — | — | — |
| 1 | — | — | W17 | — | 0.85 | COIL1-GND | — | — | — |
| 1 | — | — | W18 | — | 0.85 | COIL2-GND | — | — | — |
TPS
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | TPS signal | — | W58 | — | 0.5 | SL4-B-12 | — | — | — |
| VCC | TPS 5V supply | — | W35 | — | 0.5 | SP-5V1-1 | — | — | — |
| GND | TPS sensor ground | — | W31 | — | 0.5 | SP-0V-1 | — | — | — |
VTC
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | VTC solenoid + | — | W51 | — | 0.5 | SL4-A-18 | — | — | — |
| B | VTC solenoid - | — | W50 | — | 0.5 | SL4-A-19 | — | — | — |
VTEC
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | VTEC solenoid low side | — | W56 | — | 0.5 | SL4-A-10 | — | — | — |
| 12V | VTEC solenoid +12V | — | W14 | — | 0.85 | SP-14V-1 | — | — | — |
VTPSW
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | VTEC pressure switch | — | W62 | — | 0.5 | SL4-A-20 | — | — | — |
| GND | Switch ground | — | W32 | — | 0.5 | SP-0V-1 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| No mapped pins. | |||||||
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | CKP-VCC | SP-14V-1 | 0.85 | no route | CKP +12V | — | |
| W2 | CMP-A-VCC | SP-14V-1 | 0.85 | no route | CMP +12V | — | |
| W3 | CMP-B-VCC | SP-14V-1 | 0.85 | no route | CMP +12V | — | |
| W4 | COIL1-12V | SP-14V-1 | 0.85 | no route | Coil +12V | — | |
| W5 | COIL2-12V | SP-14V-1 | 0.85 | no route | Coil +12V | — | |
| W6 | COIL3-12V | SP-14V-1 | 0.85 | no route | Coil +12V | — | |
| W7 | COIL4-12V | SP-14V-1 | 0.85 | no route | Coil +12V | — | |
| W8 | IACV-12V | SP-14V-1 | 0.85 | no route | IACV +12V | — | |
| W9 | INJ1-12V | SP-14V-1 | 0.85 | no route | Injector +12V (main relay) | — | |
| W10 | INJ2-12V | SP-14V-1 | 0.85 | no route | Injector +12V (main relay) | — | |
| W11 | INJ3-12V | SP-14V-1 | 0.85 | no route | Injector +12V (main relay) | — | |
| W12 | INJ4-12V | SP-14V-1 | 0.85 | no route | Injector +12V (main relay) | — | |
| W13 | O2-HTR+ | SP-14V-1 | 0.85 | no route | O2 heater supply | — | |
| W14 | VTEC-12V | SP-14V-1 | 0.85 | no route | VTEC solenoid +12V | — | |
| W15 | SP-14V-1 | SL4-A-34 | 0.85 | no route | Aux 9–10 14V supply | — | |
| W16 | SP-14V-1 | SL4-B-1 | 0.85 | no route | ECU 14V supply | — | |
| W17 | COIL1-GND | SP-GND-1 | 0.85 | no route | Coil ground | — | |
| W18 | COIL2-GND | SP-GND-1 | 0.85 | no route | Coil ground | — | |
| W19 | COIL3-GND | SP-GND-1 | 0.85 | no route | Coil ground | — | |
| W20 | COIL4-GND | SP-GND-1 | 0.85 | no route | Coil ground | — | |
| W21 | SP-GND-1 | SL4-B-18 | 0.85 | no route | ECU ground | — | |
| W22 | SP-GND-1 | SL4-B-26 | 0.85 | no route | ECU ground | — | |
| W23 | CKP-GND | SP-0V-1 | 0.5 | no route | CKP sensor ground | — | |
| W24 | CMP-A-GND | SP-0V-1 | 0.5 | no route | CMP sensor ground | — | |
| W25 | CMP-B-GND | SP-0V-1 | 0.5 | no route | CMP sensor ground | — | |
| W26 | ECT-GND | SP-0V-1 | 0.5 | no route | ECT sensor ground | — | |
| W27 | IAT-GND | SP-0V-1 | 0.5 | no route | IAT sensor ground | — | |
| W29 | MAP-GND | SP-0V-1 | 0.5 | no route | MAP sensor ground | — | |
| W30 | O2-GND | SP-0V-1 | 0.5 | no route | O2 signal ground | — | |
| W31 | TPS-GND | SP-0V-1 | 0.5 | no route | TPS sensor ground | — | |
| W32 | VTPSW-GND | SP-0V-1 | 0.5 | no route | Switch ground | — | |
| W33 | SP-0V-1 | SL4-B-10 | 0.5 | no route | Analog sensor 0V reference | — | |
| W34 | MAP-VCC | SP-5V1-1 | 0.5 | no route | MAP 5V supply | — | |
| W35 | TPS-VCC | SP-5V1-1 | 0.5 | no route | TPS 5V supply | — | |
| W36 | SP-5V1-1 | SL4-B-2 | 0.5 | no route | Sensor supply Vref1 5.0V | — | |
| W37 | CKP-SIG | SL4-B-5 | 0.5 | no route | CKP signal | — | |
| W38 | SP-0V-1 | SL4-B-6 | 0.5 | no route | Crank index sensor − | — | |
| W39 | CMP-A-SIG | SL4-B-7 | 0.5 | no route | CMP signal | — | |
| W40 | SP-0V-1 | SL4-B-8 | 0.5 | no route | Sync sensor − | — | |
| W41 | KS-SIG | SL4-B-16 | 0.5 | no route | Knock signal | — | |
| W42 | COIL1-TRG | SL4-A-26 | 0.5 | no route | Igniter trigger | — | |
| W43 | COIL2-TRG | SL4-A-27 | 0.5 | no route | Igniter trigger | — | |
| W44 | COIL3-TRG | SL4-A-28 | 0.5 | no route | Igniter trigger | — | |
| W45 | COIL4-TRG | SL4-A-29 | 0.5 | no route | Igniter trigger | — | |
| W46 | INJ1-SIG | SL4-A-1 | 0.5 | no route | Injector low side | — | |
| W47 | INJ2-SIG | SL4-A-2 | 0.5 | no route | Injector low side | — | |
| W48 | INJ3-SIG | SL4-A-3 | 0.5 | no route | Injector low side | — | |
| W49 | INJ4-SIG | SL4-A-4 | 0.5 | no route | Injector low side | — | |
| W50 | VTC-B | SL4-A-19 | 0.5 | no route | VTC solenoid - | — | |
| W51 | VTC-A | SL4-A-18 | 0.5 | no route | VTC solenoid + | — | |
| W52 | NEW-IGN-1 | SL4-B-4 | 0.5 | no route | Ignition switch input | — | |
| W53 | RLY-COIL- | SL4-A-14 | 0.5 | no route | Relay coil negative (ECU low-side driver) | — | |
| W54 | O2-HTR | SL4-A-16 | 0.5 | no route | O2 heater low side | — | |
| W55 | IACV-A | SL4-A-17 | 0.5 | no route | IACV low side (coil A) | — | |
| W56 | VTEC-SIG | SL4-A-10 | 0.5 | no route | VTEC solenoid low side | — | |
| W57 | MAP-SIG | SL4-B-11 | 0.5 | no route | MAP signal | — | |
| W58 | TPS-SIG | SL4-B-12 | 0.5 | no route | TPS signal | — | |
| W59 | O2-SIG | SL4-B-13 | 0.5 | no route | Secondary O2 signal | — | |
| W60 | ECT-SIG | SL4-B-14 | 0.5 | no route | ECT signal | — | |
| W61 | IAT-SIG | SL4-B-15 | 0.5 | no route | IAT signal | — | |
| W62 | VTPSW-SIG | SL4-A-20 | 0.5 | no route | VTEC pressure switch | — | |
| W63 | CMP-B-SIG | SL4-A-21 | 0.5 | no route | CMP signal | — | |
| W64 | BAT-+ | F1-1 | 3.0 | no route | Battery positive | — | |
| W65 | F1-2 | RLY-IN | 3.0 | no route | Relay contact input (battery + via main fuse) | — | |
| W66 | RLY-OUT | SP-14V-1 | 3.0 | no route | Relay contact output (switched +12V bus) | — | |
| W67 | BAT-- | SP-GND-1 | 3.0 | no route | Battery negative / chassis ground | — | |
| W68 | NEW-IGN-1 | RLY-COIL+ | 0.5 | no route | Relay coil positive (ignition-switched +12V) | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| connector | 4-1437290-0 | TE | Superseal 1.0 34-way plug, Key 1 | 1.000 | ea |
| connector | 4-1437290-1 | TE | Superseal 1.0 34-way plug, Key 2 | 1.000 | ea |
| connector | 6189-0028 | Sumitomo | K-series IACV plug (Sumitomo MT-3S-4, 3-way) | 1.000 | ea |
| connector | 6189-0156 | Sumitomo | K-series VTEC oil-pressure switch plug (Sumitomo HW-2S-2, 2-way) | 1.000 | ea |
| connector | 6189-0553 | Sumitomo | K-series fuel injector plug (HX090-2S-3, 2-way) | 4.000 | ea |
| connector | 6189-0728 | Sumitomo | K-series coil-on-plug plug (HX090-3S-2, 3-way) | 4.000 | ea |
| connector | 6189-0887 | Sumitomo | K-series sensor plug (HX040-3S-1, 3-way — MAP/CKP/CMP/TPS) | 5.000 | ea |
| connector | 6189-0890 | Sumitomo | K-series coolant/intake air temp sensor plug (Sumitomo HX040-2S-1, 2-way) | 2.000 | ea |
| connector | 6189-0891 | Sumitomo | K-series VTEC spool-valve solenoid plug (Sumitomo HX040-2S-2, 2-way) | 1.000 | ea |
| connector | HONDA-K-KS | Honda | K-series knock sensor plug (P/N unknown; 2-way) | 1.000 | ea |
| connector | HONDA-K-O2 | Denso | K-series secondary (post-cat) O2 sensor plug (P/N unconfirmed; 4-way, metered) | 1.000 | ea |
| connector | HONDA-K-VTC | Honda | K-series VTC oil-control solenoid plug (Sumitomo HX040-2S-1 / 6189-0890, 2-way; A/B polarity pins) | 1.000 | ea |
| terminal | 3-1447221-4 | TE | Superseal 1.0 socket terminal, 20 AWG (0.5 sq mm) | 33.000 | ea |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| cam | CMP-A | CMP signal | hall | SL4-B-7 | Sync sensor + | cam_hall | — |
| cam | CMP-B | CMP signal | hall | SL4-A-21 | Digital input 2 | switch_in | Hall cam/crank signal on a general digital input — confirm the input's max frequency covers the cam signal. |
| coil | COIL1 | Igniter trigger | — | SL4-A-26 | Ignition channel 1 | ignition | — |
| coil | COIL2 | Igniter trigger | — | SL4-A-27 | Ignition channel 2 | ignition | — |
| coil | COIL3 | Igniter trigger | — | SL4-A-28 | Ignition channel 3 | ignition | — |
| coil | COIL4 | Igniter trigger | — | SL4-A-29 | Ignition channel 4 | ignition | — |
| crank | CKP | CKP signal | hall | SL4-B-5 | Crank index sensor + | crank_vr | Hall sensor on a VR-classed input — verify the trigger channel accepts a Hall (digital) signal and configure it as Hall, not VR. |
| iacv | IACV | IACV low side (coil A) | — | SL4-A-17 | Auxiliary output 8 | ls_hs | — |
| iacv | IACV | IACV low side (coil B) | — | — | — | — | — |
| injector | INJ1 | Injector low side | — | SL4-A-1 | Injection channel 1 | injector | — |
| injector | INJ2 | Injector low side | — | SL4-A-2 | Injection channel 2 | injector | — |
| injector | INJ3 | Injector low side | — | SL4-A-3 | Injection channel 3 | injector | — |
| injector | INJ4 | Injector low side | — | SL4-A-4 | Injection channel 4 | injector | — |
| knock | KS | Knock signal | — | SL4-B-16 | Knock 1 + | knock | — |
| map | MAP | MAP signal | 0_5v | SL4-B-11 | Analog input 1 | analog_0_5 | — |
| switch | VTPSW | VTEC pressure switch | switch | SL4-A-20 | Digital input 1 | switch_in | — |
| temp | ECT | ECT signal | thermistor | SL4-B-14 | Analog input 4 | analog_0_5 | — |
| temp | IAT | IAT signal | thermistor | SL4-B-15 | Analog input 5 | analog_0_5 | — |
| tps | TPS | TPS signal | 0_5v | SL4-B-12 | Analog input 2 | analog_0_5 | — |
| vtc | VTC | VTC solenoid + | — | SL4-A-18 | Auxiliary output 9 | hbridge | — |
| vtc | VTC | VTC solenoid - | — | SL4-A-19 | Auxiliary output 10 | hbridge | — |
| vtec | VTEC | VTEC solenoid low side | — | SL4-A-10 | Auxiliary output 1 | ls_hs | — |
Findings
Open (7)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | PHYS_REQUIRED_OPEN | IACV-B | IACV-B "IACV low side (coil B)" is required but not wired. |
| warn | NET_FAMILY | SL4-A-26 ↔ COIL1-TRG | SL4-A-26 "Ignition channel 1" [ignition_out] is wired to COIL1-TRG "Igniter trigger" [load]. Ignition outputs are often logic-level drivers for coils with built-in igniters; confirm the channel can sink this load. |
| warn | NET_FAMILY | SL4-A-27 ↔ COIL2-TRG | SL4-A-27 "Ignition channel 2" [ignition_out] is wired to COIL2-TRG "Igniter trigger" [load]. Ignition outputs are often logic-level drivers for coils with built-in igniters; confirm the channel can sink this load. |
| warn | NET_FAMILY | SL4-A-28 ↔ COIL3-TRG | SL4-A-28 "Ignition channel 3" [ignition_out] is wired to COIL3-TRG "Igniter trigger" [load]. Ignition outputs are often logic-level drivers for coils with built-in igniters; confirm the channel can sink this load. |
| warn | NET_FAMILY | SL4-A-29 ↔ COIL4-TRG | SL4-A-29 "Ignition channel 4" [ignition_out] is wired to COIL4-TRG "Igniter trigger" [load]. Ignition outputs are often logic-level drivers for coils with built-in igniters; confirm the channel can sink this load. |
| info | NET_FAMILY | SL4-B-4 ↔ RLY-COIL+ | SL4-B-4 "Ignition switch input" [digital_in] is wired to RLY-COIL+ "Relay coil positive (ignition-switched +12V)" [power_in]. Switched supply used as the ignition-on sense. |
| info | NET_FAMILY | SL4-B-8 ↔ MAP-GND | SL4-B-8 "Sync sensor −" [trigger_in] is wired to MAP-GND "MAP sensor ground" [sensor_ground]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs. |
Accepted (0)
| Code | Subject | Reason | By |
|---|
Notes
Engine harness for Honda K24A2, generated by engine_build() on 2026-10-06. Draft: engine-side plugs are named by function; meter each pin at the component, and confirm cylinder numbering and firing order, before crimping. Power layer to finish: size main fuse F1 for the total load, and feed NEW-IGN from the ignition switch (key-on +12 V). Pigtails: 0 plug(s) as ready-made pigtails; no pigtail sourced yet for CKP, CMP-A, CMP-B, COIL1, COIL2, COIL3, COIL4, ECT, IACV, IAT, INJ1, INJ2, INJ3, INJ4, KS, MAP, O2, TPS, VTC, VTEC, VTPSW (loose mating plug in the parts list). Left out (optional, nothing on this ECU to wire them to): WBO (LSU 4.9). Not wired: - SL4-B 17: Knock 1 − left open: the stock knock sensor has one ECU wire; check the ECU manual for single-wire knock sensors
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | Emtron SL4/SL6/SL8 ECU datasheets | https://docs.emtronaustralia.com.au/engine-management/datasheets/index.html | archive | 2026-10-05 | 1e22846cec94 |
| 4 | vendor_doc | Emtron SL4/SL6/SL8 pinout pages | https://docs.emtronaustralia.com.au/engine-management/wiring/index.html | archive | 2026-10-05 | e52b3da9996a |
| 4 | oem_manual | Mazda MX-5 NB2 (2003) wiring diagram — engine / starting / charging | https://web.archive.org/web/20191104195207/http://mellens.net/mazda/mazda_miata_extra_manual/2003_wiring.pdf | — | 2026-10-05 | 5ee0777f12c1 |
| 4 | vendor_doc | PT Motorsport — Honda K-series engine connector guide (Sumitomo part numbers) | https://www.ptmotorsport.com.au/honda-k-series-engine-connector-guide/ | archive | 2026-10-05 | 3ec344f772b0 |
| 3 | forum | rusEFI Mazda Miata 2002 engine wiring | https://github.com/rusefi/rusefi/wiki/Mazda-Miata-2002 | archive | 2026-10-05 | cc3cae670408 |
| 2 | forum | K-series engine harness sensor/actuator connectors (KSV Looms + Hybrid Racing cross-ref) | https://www.ksvlooms.com/ | archive | 2026-10-05 | bacf6b0289a6 |