Ls
AMP EFI — Microsquirt
⚠ NOT CHECKED. Don't build from this.
Drawn by [email protected] · Rev 1 · draft · 2026-10-08
Before you start
| Status | draft · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | 20: read the Findings page before cutting any wire |
| Size of the job | 71 wires · 35 connectors · 11 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 | COIL1-12V | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | COIL2-12V | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | COIL3-12V | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | COIL4-12V | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | COIL5-12V | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | COIL6-12V | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | COIL7-12V | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | COIL8-12V | 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 | INJ5-12V | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | INJ6-12V | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | INJ7-12V | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | INJ8-12V | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | MAF-12V | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | O2-HTR+ | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | SP-14V-1 | MICROSQUIRT-A-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | COIL1-GND | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | COIL2-GND | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | COIL3-GND | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | COIL4-GND | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | COIL5-GND | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | COIL6-GND | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | COIL7-GND | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | COIL8-GND | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | MAF-GND | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | SP-GND-1 | MICROSQUIRT-A-22 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | SP-GND-1 | MICROSQUIRT-A-23 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | APP-GND1 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | APP-GND2 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | CKP-GND | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | CMP-GND | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | ECT-GND | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | KS1-GND | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | KS2-GND | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | MAF-IATGND | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | MAP-GND | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | O2-GND | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | TB-GND | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | SP-0V-1 | MICROSQUIRT-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | SP-0V-1 | MICROSQUIRT-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | SP-0V-1 | MICROSQUIRT-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | APP-VCC1 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | APP-VCC2 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | CKP-VCC | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | CMP-VCC | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | MAP-VCC | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | TB-VCC | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W51 | SP-5V1-1 | MICROSQUIRT-A-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W52 | CKP-SIG | MICROSQUIRT-A-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W53 | CMP-SIG | MICROSQUIRT-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W54 | COIL1-CTRL | MICROSQUIRT-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W55 | COIL2-CTRL | MICROSQUIRT-A-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W56 | INJ1-SIG | MICROSQUIRT-A-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W57 | INJ2-SIG | MICROSQUIRT-A-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W58 | RLY-COIL- | MICROSQUIRT-A-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W59 | O2-HTR | MICROSQUIRT-A-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W60 | MAF-SIG | MICROSQUIRT-A-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W61 | MAP-SIG | MICROSQUIRT-A-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W62 | APP-SIG1 | MICROSQUIRT-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W63 | APP-SIG2 | MICROSQUIRT-A-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W64 | O2-SIG | MICROSQUIRT-A-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W65 | ECT-SIG | MICROSQUIRT-A-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W66 | MAF-IAT | MICROSQUIRT-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W67 | BAT-+ | F1-1 | 3.0 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W68 | F1-2 | RLY-IN | 3.0 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W69 | RLY-OUT | SP-14V-1 | 3.0 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W70 | BAT-- | SP-GND-1 | 3.0 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W71 | 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 | COIL1-12V | APP-GND1 | open (OL) | +12 V supply must not touch sensor ground | |
| 2 | COIL1-12V | BAT-- | open (OL) | +12 V supply must not touch power ground | |
| 3 | APP-GND1 | APP-VCC1 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 4 | APP-GND1 | F1-1 | open (OL) | sensor ground must not touch +12 V supply | |
| 5 | APP-GND1 | F1-2 | open (OL) | sensor ground must not touch +12 V supply | |
| 6 | APP-GND1 | NEW-IGN-1 | open (OL) | sensor ground must not touch +12 V supply | |
| 7 | APP-VCC1 | F1-1 | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 8 | APP-VCC1 | F1-2 | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 9 | APP-VCC1 | NEW-IGN-1 | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 10 | BAT-- | APP-VCC1 | open (OL) | power ground must not touch 5 V sensor reference | |
| 11 | BAT-- | F1-1 | open (OL) | power ground must not touch +12 V supply | |
| 12 | BAT-- | F1-2 | open (OL) | power ground must not touch +12 V supply | |
| 13 | BAT-- | NEW-IGN-1 | open (OL) | power ground must not touch +12 V supply | |
| 14 | COIL1-12V | APP-VCC1 | open (OL) | +12 V supply must not touch 5 V sensor reference |
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| 1 | Before edits | [email protected] | 2026-10-08 |
Schematic
Connectors
APP
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG1 | Pedal position 1 | — | W62 | — | 0.5 | MICROSQUIRT-A-27 | — | — | — |
| VCC1 | Pedal 1 5V supply | — | W45 | — | 0.5 | SP-5V1-1 | — | — | — |
| GND1 | Pedal 1 low ref | — | W31 | — | 0.5 | SP-0V-1 | — | — | — |
| SIG2 | Pedal position 2 | — | W63 | — | 0.5 | MICROSQUIRT-A-29 | — | — | — |
| VCC2 | Pedal 2 5V supply | — | W46 | — | 0.5 | SP-5V1-1 | — | — | — |
| GND2 | Pedal 2 low ref | — | W32 | — | 0.5 | SP-0V-1 | — | — | — |
BAT
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| + | Battery positive | — | W67 | — | 3.0 | F1-1 | — | — | — |
| - | Battery negative / chassis ground | — | W70 | — | 3.0 | SP-GND-1 | — | — | — |
CKP
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | Crank signal (58x) | — | W52 | — | 0.5 | MICROSQUIRT-A-32 | — | — | — |
| VCC | Crank 5V supply | — | W47 | — | 0.5 | SP-5V1-1 | — | — | — |
| GND | Crank sensor ground | — | W33 | — | 0.5 | SP-0V-1 | — | — | — |
CMP
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | Cam signal (4x) | — | W53 | — | 0.5 | MICROSQUIRT-A-4 | — | — | — |
| VCC | Cam 5V supply | — | W48 | — | 0.5 | SP-5V1-1 | — | — | — |
| GND | Cam sensor ground | — | W34 | — | 0.5 | SP-0V-1 | — | — | — |
COIL1
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| CTRL | Coil trigger low side | — | W54 | — | 0.5 | MICROSQUIRT-A-11 | — | — | — |
| 12V | Coil +12V | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| GND | Coil ground | — | W20 | — | 0.85 | SP-GND-1 | — | — | — |
COIL2
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| CTRL | Coil trigger low side | — | W55 | — | 0.5 | MICROSQUIRT-A-12 | — | — | — |
| 12V | Coil +12V | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| GND | Coil ground | — | W21 | — | 0.85 | SP-GND-1 | — | — | — |
COIL3
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| CTRL | Coil trigger low side | — | — | — | — | — | — | — | — |
| 12V | Coil +12V | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| GND | Coil ground | — | W22 | — | 0.85 | SP-GND-1 | — | — | — |
COIL4
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| CTRL | Coil trigger low side | — | — | — | — | — | — | — | — |
| 12V | Coil +12V | — | W4 | — | 0.85 | SP-14V-1 | — | — | — |
| GND | Coil ground | — | W23 | — | 0.85 | SP-GND-1 | — | — | — |
COIL5
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| CTRL | Coil trigger low side | — | — | — | — | — | — | — | — |
| 12V | Coil +12V | — | W5 | — | 0.85 | SP-14V-1 | — | — | — |
| GND | Coil ground | — | W24 | — | 0.85 | SP-GND-1 | — | — | — |
COIL6
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| CTRL | Coil trigger low side | — | — | — | — | — | — | — | — |
| 12V | Coil +12V | — | W6 | — | 0.85 | SP-14V-1 | — | — | — |
| GND | Coil ground | — | W25 | — | 0.85 | SP-GND-1 | — | — | — |
COIL7
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| CTRL | Coil trigger low side | — | — | — | — | — | — | — | — |
| 12V | Coil +12V | — | W7 | — | 0.85 | SP-14V-1 | — | — | — |
| GND | Coil ground | — | W26 | — | 0.85 | SP-GND-1 | — | — | — |
COIL8
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| CTRL | Coil trigger low side | — | — | — | — | — | — | — | — |
| 12V | Coil +12V | — | W8 | — | 0.85 | SP-14V-1 | — | — | — |
| GND | Coil ground | — | W27 | — | 0.85 | SP-GND-1 | — | — | — |
ECT
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | ECT signal | — | W65 | — | 0.5 | MICROSQUIRT-A-25 | — | — | — |
| GND | ECT sensor ground | — | W35 | — | 0.5 | SP-0V-1 | — | — | — |
F1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W67 | — | 3.0 | BAT-+ | — | — | — |
| 2 | — | — | W68 | — | 3.0 | RLY-IN | — | — | — |
INJ1
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | Injector low side | — | W56 | — | 0.5 | MICROSQUIRT-A-9 | — | — | — |
| 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 | — | W57 | — | 0.5 | MICROSQUIRT-A-10 | — | — | — |
| 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 | — | — | — | — | — | — | — | — |
| 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 | — | — | — | — | — | — | — | — |
| 12V | Injector +12V (main relay) | — | W12 | — | 0.85 | SP-14V-1 | — | — | — |
INJ5
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | Injector low side | — | — | — | — | — | — | — | — |
| 12V | Injector +12V (main relay) | — | W13 | — | 0.85 | SP-14V-1 | — | — | — |
INJ6
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | Injector low side | — | — | — | — | — | — | — | — |
| 12V | Injector +12V (main relay) | — | W14 | — | 0.85 | SP-14V-1 | — | — | — |
INJ7
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | Injector low side | — | — | — | — | — | — | — | — |
| 12V | Injector +12V (main relay) | — | W15 | — | 0.85 | SP-14V-1 | — | — | — |
INJ8
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | Injector low side | — | — | — | — | — | — | — | — |
| 12V | Injector +12V (main relay) | — | W16 | — | 0.85 | SP-14V-1 | — | — | — |
KS1
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | Knock signal | — | — | — | — | — | — | — | — |
| GND | Knock shield/return | — | W36 | — | 0.5 | SP-0V-1 | — | — | — |
KS2
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | Knock signal | — | — | — | — | — | — | — | — |
| GND | Knock shield/return | — | W37 | — | 0.5 | SP-0V-1 | — | — | — |
MAF
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | MAF signal (frequency) | — | W60 | — | 0.5 | MICROSQUIRT-A-5 | — | — | — |
| 12V | MAF +12V | — | W17 | — | 0.85 | SP-14V-1 | — | — | — |
| GND | MAF ground | — | W28 | — | 0.85 | SP-GND-1 | — | — | — |
| IAT | IAT signal | — | W66 | — | 0.5 | MICROSQUIRT-A-26 | — | — | — |
| IATGND | IAT ground | — | W38 | — | 0.5 | SP-0V-1 | — | — | — |
MAP
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | MAP signal | — | W61 | — | 0.5 | MICROSQUIRT-A-24 | — | — | — |
| VCC | MAP 5V supply | — | W49 | — | 0.5 | SP-5V1-1 | — | — | — |
| GND | MAP sensor ground | — | W39 | — | 0.5 | SP-0V-1 | — | — | — |
MICROSQUIRT-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | +12V In | — | W19 | — | 0.85 | SP-14V-1 | — | — | — |
| 10 | INJ 2 | — | W57 | — | 0.5 | INJ2-SIG | — | — | — |
| 11 | SPK B (IGN2) | — | W54 | — | 0.5 | COIL1-CTRL | — | — | — |
| 12 | SPK A (IGN 1) | — | W55 | — | 0.5 | COIL2-CTRL | — | — | — |
| 13 | RX | — | — | — | — | — | — | — | — |
| 14 | TX | — | — | — | — | — | — | — | — |
| 15 | BOOT LOAD | — | — | — | — | — | — | — | — |
| 16 | ALED | — | — | — | — | — | — | — | — |
| 17 | WLED | — | W59 | — | 0.5 | O2-HTR | — | — | — |
| 18 | Sensor Ground | — | W42 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | Serial Ground | — | W43 | — | 0.5 | SP-0V-1 | — | — | — |
| 2 | CANH | — | — | — | — | — | — | — | — |
| 20 | Sensor Ground | — | W44 | — | 0.5 | SP-0V-1 | — | — | — |
| 21 | VR2- | — | — | — | — | — | — | — | — |
| 22 | POWER GROUND | — | W29 | — | 0.85 | SP-GND-1 | — | — | — |
| 23 | POWER GROUND | — | W30 | — | 0.85 | SP-GND-1 | — | — | — |
| 24 | MAP | — | W61 | — | 0.5 | MAP-SIG | — | — | — |
| 25 | CLT | — | W65 | — | 0.5 | ECT-SIG | — | — | — |
| 26 | MAT | — | W66 | — | 0.5 | MAF-IAT | — | — | — |
| 27 | TPS | — | W62 | — | 0.5 | APP-SIG1 | — | — | — |
| 28 | TPS VREF (5V) | — | W51 | — | 0.5 | SP-5V1-1 | — | — | — |
| 29 | SPAREADC | — | W63 | — | 0.5 | APP-SIG2 | — | — | — |
| 3 | CANL | — | — | — | — | — | — | — | — |
| 30 | OPTO+ | — | — | — | — | — | — | — | — |
| 31 | OPTO- | — | — | — | — | — | — | — | — |
| 32 | VR1+ | — | W52 | — | 0.5 | CKP-SIG | — | — | — |
| 33 | VR1- | — | — | — | — | — | — | — | — |
| 34 | O2 | — | W64 | — | 0.5 | O2-SIG | — | — | — |
| 35 | TACHO | — | — | — | — | — | — | — | — |
| 4 | VR2+ | — | W53 | — | 0.5 | CMP-SIG | — | — | — |
| 5 | SPAREADC2 (MAF) | — | W60 | — | 0.5 | MAF-SIG | — | — | — |
| 6 | FLEX | — | — | — | — | — | — | — | — |
| 7 | FIDLE | — | — | — | — | — | — | — | — |
| 8 | FP (pump) | — | W58 | — | 0.5 | RLY-COIL- | — | — | — |
| 9 | INJ 1 | — | W56 | — | 0.5 | INJ1-SIG | — | — | — |
NEW-IGN
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W71 | — | 0.5 | RLY-COIL+ | — | — | — |
O2
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | O2 signal | — | W64 | — | 0.5 | MICROSQUIRT-A-34 | — | — | — |
| GND | O2 signal ground | — | W40 | — | 0.5 | SP-0V-1 | — | — | — |
| HTR | O2 heater low side | — | W59 | — | 0.5 | MICROSQUIRT-A-17 | — | — | — |
| HTR+ | O2 heater supply | — | W18 | — | 0.85 | SP-14V-1 | — | — | — |
RLY
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| COIL+ | Relay coil positive (ignition-switched +12V) | — | W71 | — | 0.5 | NEW-IGN-1 | — | — | — |
| COIL- | Relay coil negative (ECU low-side driver) | — | W58 | — | 0.5 | MICROSQUIRT-A-8 | — | — | — |
| IN | Relay contact input (battery + via main fuse) | — | W68 | — | 3.0 | F1-2 | — | — | — |
| OUT | Relay contact output (switched +12V bus) | — | W69 | — | 3.0 | SP-14V-1 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W31 | — | 0.5 | APP-GND1 | — | — | — |
| 1 | — | — | W32 | — | 0.5 | APP-GND2 | — | — | — |
| 1 | — | — | W33 | — | 0.5 | CKP-GND | — | — | — |
| 1 | — | — | W34 | — | 0.5 | CMP-GND | — | — | — |
| 1 | — | — | W35 | — | 0.5 | ECT-GND | — | — | — |
| 1 | — | — | W36 | — | 0.5 | KS1-GND | — | — | — |
| 1 | — | — | W37 | — | 0.5 | KS2-GND | — | — | — |
| 1 | — | — | W38 | — | 0.5 | MAF-IATGND | — | — | — |
| 1 | — | — | W39 | — | 0.5 | MAP-GND | — | — | — |
| 1 | — | — | W40 | — | 0.5 | O2-GND | — | — | — |
| 1 | — | — | W41 | — | 0.5 | TB-GND | — | — | — |
| 1 | — | — | W42 | — | 0.5 | MICROSQUIRT-A-18 | — | — | — |
| 1 | — | — | W43 | — | 0.5 | MICROSQUIRT-A-19 | — | — | — |
| 1 | — | — | W44 | — | 0.5 | MICROSQUIRT-A-20 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W13 | — | 0.85 | INJ5-12V | — | — | — |
| 1 | — | — | W1 | — | 0.85 | COIL1-12V | — | — | — |
| 1 | — | — | W2 | — | 0.85 | COIL2-12V | — | — | — |
| 1 | — | — | W3 | — | 0.85 | COIL3-12V | — | — | — |
| 1 | — | — | W4 | — | 0.85 | COIL4-12V | — | — | — |
| 1 | — | — | W5 | — | 0.85 | COIL5-12V | — | — | — |
| 1 | — | — | W6 | — | 0.85 | COIL6-12V | — | — | — |
| 1 | — | — | W7 | — | 0.85 | COIL7-12V | — | — | — |
| 1 | — | — | W8 | — | 0.85 | COIL8-12V | — | — | — |
| 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 | — | — | W14 | — | 0.85 | INJ6-12V | — | — | — |
| 1 | — | — | W15 | — | 0.85 | INJ7-12V | — | — | — |
| 1 | — | — | W16 | — | 0.85 | INJ8-12V | — | — | — |
| 1 | — | — | W17 | — | 0.85 | MAF-12V | — | — | — |
| 1 | — | — | W18 | — | 0.85 | O2-HTR+ | — | — | — |
| 1 | — | — | W19 | — | 0.85 | MICROSQUIRT-A-1 | — | — | — |
| 1 | — | — | W69 | — | 3.0 | RLY-OUT | — | — | — |
SP-5V1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W45 | — | 0.5 | APP-VCC1 | — | — | — |
| 1 | — | — | W51 | — | 0.5 | MICROSQUIRT-A-28 | — | — | — |
| 1 | — | — | W46 | — | 0.5 | APP-VCC2 | — | — | — |
| 1 | — | — | W47 | — | 0.5 | CKP-VCC | — | — | — |
| 1 | — | — | W48 | — | 0.5 | CMP-VCC | — | — | — |
| 1 | — | — | W49 | — | 0.5 | MAP-VCC | — | — | — |
| 1 | — | — | W50 | — | 0.5 | TB-VCC | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W27 | — | 0.85 | COIL8-GND | — | — | — |
| 1 | — | — | W28 | — | 0.85 | MAF-GND | — | — | — |
| 1 | — | — | W29 | — | 0.85 | MICROSQUIRT-A-22 | — | — | — |
| 1 | — | — | W30 | — | 0.85 | MICROSQUIRT-A-23 | — | — | — |
| 1 | — | — | W70 | — | 3.0 | BAT-- | — | — | — |
| 1 | — | — | W25 | — | 0.85 | COIL6-GND | — | — | — |
| 1 | — | — | W20 | — | 0.85 | COIL1-GND | — | — | — |
| 1 | — | — | W21 | — | 0.85 | COIL2-GND | — | — | — |
| 1 | — | — | W22 | — | 0.85 | COIL3-GND | — | — | — |
| 1 | — | — | W23 | — | 0.85 | COIL4-GND | — | — | — |
| 1 | — | — | W24 | — | 0.85 | COIL5-GND | — | — | — |
| 1 | — | — | W26 | — | 0.85 | COIL7-GND | — | — | — |
TB
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| TPS1 | Throttle position 1 | — | — | — | — | — | — | — | — |
| TPS2 | Throttle position 2 | — | — | — | — | — | — | — | — |
| VCC | Throttle 5V supply | — | W50 | — | 0.5 | SP-5V1-1 | — | — | — |
| GND | Throttle sensor ground | — | W41 | — | 0.5 | SP-0V-1 | — | — | — |
| M+ | Throttle motor + | — | — | — | — | — | — | — | — |
| M- | Throttle motor − | — | — | — | — | — | — | — | — |
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 | COIL1-12V | SP-14V-1 | 0.85 | no route | Coil +12V | — | |
| W2 | COIL2-12V | SP-14V-1 | 0.85 | no route | Coil +12V | — | |
| W3 | COIL3-12V | SP-14V-1 | 0.85 | no route | Coil +12V | — | |
| W4 | COIL4-12V | SP-14V-1 | 0.85 | no route | Coil +12V | — | |
| W5 | COIL5-12V | SP-14V-1 | 0.85 | no route | Coil +12V | — | |
| W6 | COIL6-12V | SP-14V-1 | 0.85 | no route | Coil +12V | — | |
| W7 | COIL7-12V | SP-14V-1 | 0.85 | no route | Coil +12V | — | |
| W8 | COIL8-12V | SP-14V-1 | 0.85 | no route | Coil +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 | INJ5-12V | SP-14V-1 | 0.85 | no route | Injector +12V (main relay) | — | |
| W14 | INJ6-12V | SP-14V-1 | 0.85 | no route | Injector +12V (main relay) | — | |
| W15 | INJ7-12V | SP-14V-1 | 0.85 | no route | Injector +12V (main relay) | — | |
| W16 | INJ8-12V | SP-14V-1 | 0.85 | no route | Injector +12V (main relay) | — | |
| W17 | MAF-12V | SP-14V-1 | 0.85 | no route | MAF +12V | — | |
| W18 | O2-HTR+ | SP-14V-1 | 0.85 | no route | O2 heater supply | — | |
| W19 | SP-14V-1 | MICROSQUIRT-A-1 | 0.85 | no route | +12V In | — | |
| W20 | COIL1-GND | SP-GND-1 | 0.85 | no route | Coil ground | — | |
| W21 | COIL2-GND | SP-GND-1 | 0.85 | no route | Coil ground | — | |
| W22 | COIL3-GND | SP-GND-1 | 0.85 | no route | Coil ground | — | |
| W23 | COIL4-GND | SP-GND-1 | 0.85 | no route | Coil ground | — | |
| W24 | COIL5-GND | SP-GND-1 | 0.85 | no route | Coil ground | — | |
| W25 | COIL6-GND | SP-GND-1 | 0.85 | no route | Coil ground | — | |
| W26 | COIL7-GND | SP-GND-1 | 0.85 | no route | Coil ground | — | |
| W27 | COIL8-GND | SP-GND-1 | 0.85 | no route | Coil ground | — | |
| W28 | MAF-GND | SP-GND-1 | 0.85 | no route | MAF ground | — | |
| W29 | SP-GND-1 | MICROSQUIRT-A-22 | 0.85 | no route | POWER GROUND | — | |
| W30 | SP-GND-1 | MICROSQUIRT-A-23 | 0.85 | no route | POWER GROUND | — | |
| W31 | APP-GND1 | SP-0V-1 | 0.5 | no route | Pedal 1 low ref | — | |
| W32 | APP-GND2 | SP-0V-1 | 0.5 | no route | Pedal 2 low ref | — | |
| W33 | CKP-GND | SP-0V-1 | 0.5 | no route | Crank sensor ground | — | |
| W34 | CMP-GND | SP-0V-1 | 0.5 | no route | Cam sensor ground | — | |
| W35 | ECT-GND | SP-0V-1 | 0.5 | no route | ECT sensor ground | — | |
| W36 | KS1-GND | SP-0V-1 | 0.5 | no route | Knock shield/return | — | |
| W37 | KS2-GND | SP-0V-1 | 0.5 | no route | Knock shield/return | — | |
| W38 | MAF-IATGND | SP-0V-1 | 0.5 | no route | IAT ground | — | |
| W39 | MAP-GND | SP-0V-1 | 0.5 | no route | MAP sensor ground | — | |
| W40 | O2-GND | SP-0V-1 | 0.5 | no route | O2 signal ground | — | |
| W41 | TB-GND | SP-0V-1 | 0.5 | no route | Throttle sensor ground | — | |
| W42 | SP-0V-1 | MICROSQUIRT-A-18 | 0.5 | no route | Sensor Ground | — | |
| W43 | SP-0V-1 | MICROSQUIRT-A-19 | 0.5 | no route | Serial Ground | — | |
| W44 | SP-0V-1 | MICROSQUIRT-A-20 | 0.5 | no route | Sensor Ground | — | |
| W45 | APP-VCC1 | SP-5V1-1 | 0.5 | no route | Pedal 1 5V supply | — | |
| W46 | APP-VCC2 | SP-5V1-1 | 0.5 | no route | Pedal 2 5V supply | — | |
| W47 | CKP-VCC | SP-5V1-1 | 0.5 | no route | Crank 5V supply | — | |
| W48 | CMP-VCC | SP-5V1-1 | 0.5 | no route | Cam 5V supply | — | |
| W49 | MAP-VCC | SP-5V1-1 | 0.5 | no route | MAP 5V supply | — | |
| W50 | TB-VCC | SP-5V1-1 | 0.5 | no route | Throttle 5V supply | — | |
| W51 | SP-5V1-1 | MICROSQUIRT-A-28 | 0.5 | no route | TPS VREF (5V) | — | |
| W52 | CKP-SIG | MICROSQUIRT-A-32 | 0.5 | no route | Crank signal (58x) | — | |
| W53 | CMP-SIG | MICROSQUIRT-A-4 | 0.5 | no route | Cam signal (4x) | — | |
| W54 | COIL1-CTRL | MICROSQUIRT-A-11 | 0.5 | no route | Coil trigger low side | — | |
| W55 | COIL2-CTRL | MICROSQUIRT-A-12 | 0.5 | no route | Coil trigger low side | — | |
| W56 | INJ1-SIG | MICROSQUIRT-A-9 | 0.5 | no route | Injector low side | — | |
| W57 | INJ2-SIG | MICROSQUIRT-A-10 | 0.5 | no route | Injector low side | — | |
| W58 | RLY-COIL- | MICROSQUIRT-A-8 | 0.5 | no route | Relay coil negative (ECU low-side driver) | — | |
| W59 | O2-HTR | MICROSQUIRT-A-17 | 0.5 | no route | O2 heater low side | — | |
| W60 | MAF-SIG | MICROSQUIRT-A-5 | 0.5 | no route | MAF signal (frequency) | — | |
| W61 | MAP-SIG | MICROSQUIRT-A-24 | 0.5 | no route | MAP signal | — | |
| W62 | APP-SIG1 | MICROSQUIRT-A-27 | 0.5 | no route | Pedal position 1 | — | |
| W63 | APP-SIG2 | MICROSQUIRT-A-29 | 0.5 | no route | Pedal position 2 | — | |
| W64 | O2-SIG | MICROSQUIRT-A-34 | 0.5 | no route | O2 signal | — | |
| W65 | ECT-SIG | MICROSQUIRT-A-25 | 0.5 | no route | ECT signal | — | |
| W66 | MAF-IAT | MICROSQUIRT-A-26 | 0.5 | no route | IAT signal | — | |
| W67 | BAT-+ | F1-1 | 3.0 | no route | Battery positive | — | |
| W68 | F1-2 | RLY-IN | 3.0 | no route | Relay contact input (battery + via main fuse) | — | |
| W69 | RLY-OUT | SP-14V-1 | 3.0 | no route | Relay contact output (switched +12V bus) | — | |
| W70 | BAT-- | SP-GND-1 | 3.0 | no route | Battery negative / chassis ground | — | |
| W71 | 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 | GM-LS-APP | GM | GM LS accelerator pedal plug (P/N unknown; 6-way) | 1.000 | ea |
| connector | GM-LS-CKP | GM | GM LS crank sensor plug (P/N unknown; 3-way) | 1.000 | ea |
| connector | GM-LS-CMP | GM | GM LS cam sensor plug (P/N unknown; 3-way) | 1.000 | ea |
| connector | GM-LS-COP | GM | GM LS ignition coil plug (P/N unknown; 3-way, metered) | 8.000 | ea |
| connector | GM-LS-ECT | GM | GM LS ECT sensor plug (P/N unknown; 2-way) | 1.000 | ea |
| connector | GM-LS-INJ | GM | GM LS injector plug (P/N unknown; 2-way, metered) | 8.000 | ea |
| connector | GM-LS-KS | GM | GM LS knock sensor plug (P/N unknown; 2-way) | 2.000 | ea |
| connector | GM-LS-MAF | GM | GM LS MAF/IAT sensor plug (P/N unknown; 5-way) | 1.000 | ea |
| connector | GM-LS-MAP | GM | GM LS MAP sensor plug (P/N unknown; 3-way) | 1.000 | ea |
| connector | GM-LS-O2 | GM | GM LS O2 sensor plug (P/N unknown; 4-way) | 1.000 | ea |
| connector | GM-LS-TB | GM | GM LS throttle body plug (P/N unknown; 6-way) | 1.000 | ea |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| cam | CMP | Cam signal (4x) | hall | MICROSQUIRT-A-4 | VR2+ | cam_vr | Hall sensor on a VR-classed input — verify the trigger channel accepts a Hall (digital) signal and configure it as Hall, not VR. |
| coil | COIL1 | Coil trigger low side | — | MICROSQUIRT-A-11 | SPK B (IGN2) | ignition | — |
| coil | COIL2 | Coil trigger low side | — | MICROSQUIRT-A-12 | SPK A (IGN 1) | ignition | — |
| coil | COIL3 | Coil trigger low side | — | — | — | — | — |
| coil | COIL4 | Coil trigger low side | — | — | — | — | — |
| coil | COIL5 | Coil trigger low side | — | — | — | — | — |
| coil | COIL6 | Coil trigger low side | — | — | — | — | — |
| coil | COIL7 | Coil trigger low side | — | — | — | — | — |
| coil | COIL8 | Coil trigger low side | — | — | — | — | — |
| crank | CKP | Crank signal (58x) | hall | MICROSQUIRT-A-32 | VR1+ | 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. |
| dbw_motor | TB | Throttle motor + | — | — | — | — | — |
| dbw_motor | TB | Throttle motor − | — | — | — | — | — |
| dbw_pedal | APP | Pedal position 1 | 0_5v | MICROSQUIRT-A-27 | TPS | tps | — |
| dbw_pedal | APP | Pedal position 2 | 0_5v | MICROSQUIRT-A-29 | SPAREADC | analog_0_5 | — |
| dbw_tps | TB | Throttle position 1 | 0_5v | — | — | — | — |
| dbw_tps | TB | Throttle position 2 | 0_5v | — | — | — | — |
| heater | O2 | O2 heater low side | — | MICROSQUIRT-A-17 | WLED | low_side | — |
| injector | INJ1 | Injector low side | — | MICROSQUIRT-A-9 | INJ 1 | injector | — |
| injector | INJ2 | Injector low side | — | MICROSQUIRT-A-10 | INJ 2 | injector | — |
| injector | INJ3 | Injector low side | — | — | — | — | — |
| injector | INJ4 | Injector low side | — | — | — | — | — |
| injector | INJ5 | Injector low side | — | — | — | — | — |
| injector | INJ6 | Injector low side | — | — | — | — | — |
| injector | INJ7 | Injector low side | — | — | — | — | — |
| injector | INJ8 | Injector low side | — | — | — | — | — |
| knock | KS1 | Knock signal | — | — | — | — | — |
| knock | KS2 | Knock signal | — | — | — | — | — |
| maf | MAF | MAF signal (frequency) | — | MICROSQUIRT-A-5 | SPAREADC2 (MAF) | analog_0_5 | — |
| map | MAP | MAP signal | 0_5v | MICROSQUIRT-A-24 | MAP | map | — |
| o2 | O2 | O2 signal | 0_5v | MICROSQUIRT-A-34 | O2 | o2_narrowband | — |
| temp | ECT | ECT signal | thermistor | MICROSQUIRT-A-25 | CLT | thermistor | — |
| temp | MAF | IAT signal | thermistor | MICROSQUIRT-A-26 | MAT | thermistor | — |
Findings
Open (23)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | K_DBW_UNSUPPORTED | Microsquirt | The LS3 is drive-by-wire, but Microsquirt has no electronic-throttle (H-bridge) control. Use a cable-throttle variant or an ECU with DBW. |
| error | K_TRIGGER_UNSUPPORTED | Microsquirt | Microsquirt does not list the LS3 trigger pattern (not_found). Confirm the decoder in its documentation or the engine will not run. |
| error | PHYS_REQUIRED_OPEN | COIL3-CTRL | COIL3-CTRL "Coil trigger low side" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | COIL4-CTRL | COIL4-CTRL "Coil trigger low side" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | COIL5-CTRL | COIL5-CTRL "Coil trigger low side" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | COIL6-CTRL | COIL6-CTRL "Coil trigger low side" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | COIL7-CTRL | COIL7-CTRL "Coil trigger low side" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | COIL8-CTRL | COIL8-CTRL "Coil trigger low side" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | INJ3-SIG | INJ3-SIG "Injector low side" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | INJ4-SIG | INJ4-SIG "Injector low side" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | INJ5-SIG | INJ5-SIG "Injector low side" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | INJ6-SIG | INJ6-SIG "Injector low side" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | INJ7-SIG | INJ7-SIG "Injector low side" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | INJ8-SIG | INJ8-SIG "Injector low side" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | KS1-SIG | KS1-SIG "Knock signal" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | KS2-SIG | KS2-SIG "Knock signal" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | TB-M+ | TB-M+ "Throttle motor +" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | TB-M- | TB-M- "Throttle motor −" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | TB-TPS1 | TB-TPS1 "Throttle position 1" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | TB-TPS2 | TB-TPS2 "Throttle position 2" is required but not wired. |
| warn | K_SEQUENTIAL_UNAVAILABLE | Microsquirt | Microsquirt has 2 injector channels for 8 cylinders, so it can only batch-fire. |
| warn | NET_FAMILY | MICROSQUIRT-A-11 ↔ COIL1-CTRL | MICROSQUIRT-A-11 "SPK B (IGN2)" [ignition_out] is wired to COIL1-CTRL "Coil trigger low side" [load]. Ignition outputs are often logic-level drivers for coils with built-in igniters; confirm the channel can sink this load. |
| warn | NET_FAMILY | MICROSQUIRT-A-12 ↔ COIL2-CTRL | MICROSQUIRT-A-12 "SPK A (IGN 1)" [ignition_out] is wired to COIL2-CTRL "Coil trigger low side" [load]. Ignition outputs are often logic-level drivers for coils with built-in igniters; confirm the channel can sink this load. |
Accepted (0)
| Code | Subject | Reason | By |
|---|
Notes
Engine harness for GM LS3, generated by engine_build() on 2026-10-08. 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 APP, CKP, CMP, COIL1, COIL2, COIL3, COIL4, COIL5, COIL6, COIL7, COIL8, ECT, INJ1, INJ2, INJ3, INJ4, INJ5, INJ6, INJ7, INJ8, KS1, KS2, MAF, MAP, O2, TB (loose mating plug in the parts list). Left out (optional, nothing on this ECU to wire them to): WBO (LSU 4.9). Open items: - KS1 SIG: KS1 Knock signal: no free knock input on AMP EFI Microsquirt - KS2 SIG: KS2 Knock signal: no free knock input on AMP EFI Microsquirt - COIL3 CTRL: COIL3 Coil trigger low side: no free ignition output on AMP EFI Microsquirt - COIL4 CTRL: COIL4 Coil trigger low side: no free ignition output on AMP EFI Microsquirt - COIL5 CTRL: COIL5 Coil trigger low side: no free ignition output on AMP EFI Microsquirt - COIL6 CTRL: COIL6 Coil trigger low side: no free ignition output on AMP EFI Microsquirt - COIL7 CTRL: COIL7 Coil trigger low side: no free ignition output on AMP EFI Microsquirt - COIL8 CTRL: COIL8 Coil trigger low side: no free ignition output on AMP EFI Microsquirt - INJ3 SIG: INJ3 Injector low side: no free injector output on AMP EFI Microsquirt - INJ4 SIG: INJ4 Injector low side: no free injector output on AMP EFI Microsquirt - INJ5 SIG: INJ5 Injector low side: no free injector output on AMP EFI Microsquirt - INJ6 SIG: INJ6 Injector low side: no free injector output on AMP EFI Microsquirt - INJ7 SIG: INJ7 Injector low side: no free injector output on AMP EFI Microsquirt - INJ8 SIG: INJ8 Injector low side: no free injector output on AMP EFI Microsquirt - TB M+: TB Throttle motor +: needs a paired H-bridge on AMP EFI Microsquirt (H-bridge pairing not in the library: set device_pin.bridge_pair from the ECU manual) - TB M-: TB Throttle motor −: needs a paired H-bridge on AMP EFI Microsquirt (H-bridge pairing not in the library: set device_pin.bridge_pair from the ECU manual) - TB TPS1: TB Throttle position 1: no free tps/analog_0_5 on AMP EFI Microsquirt - TB TPS2: TB Throttle position 2: no free tps/analog_0_5 on AMP EFI Microsquirt Not wired: - NEW-IGN 1: Ignition switch (key-on +12 V): key-on 12 V sense — optional in a swap (the main relay is energized from keyed 12 V, not from this pin); AMP EFI Microsquirt has no dedicated key-on input
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 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 | vendor_doc | MSExtra: Microsquirt hardware 3.4 | http://www.msextra.com/doc/pdf/Microsquirt_Hardware-3.4.pdf | archive | 2026-10-05 | ad920d9160de |
| 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 |
| 3 | forum | rusEFI Mazda Miata 2002 engine wiring | https://github.com/rusefi/rusefi/wiki/Mazda-Miata-2002 | archive | 2026-10-05 | cc3cae670408 |
| 2 | community_copy | lt1swap.com: E38 ECM Connector Pinouts | https://lt1swap.com/E38 ECM Connector Pinouts.htm | — | — | — |