K20A2 → Emtron SL8 (bulkhead)
Emtron — SL8
Drawn by Michael Gnankou · Rev 0 · proposal · 2026-10-04
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
BATT-P
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| + | Battery positive | — | P1 | — | 0.85 | RELAY-R-IN | — | — | — |
| - | Battery negative / chassis ground | — | P21 | — | 0.85 | SP-GND-1 | — | — | — |
BHD
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | E1 | — | 0.5 | INJ1-SIG | — | — | — |
| 1 | — | — | C33 | — | 0.5 | SL8-A-1 | — | — | — |
| 2 | — | — | C34 | — | 0.5 | SL8-A-2 | — | — | — |
| 2 | — | — | E2 | — | 0.5 | INJ2-SIG | — | — | — |
| 3 | — | — | E3 | — | 0.5 | INJ3-SIG | — | — | — |
| 3 | — | — | C35 | — | 0.5 | SL8-A-3 | — | — | — |
| 4 | — | — | E4 | — | 0.5 | INJ4-SIG | — | — | — |
| 4 | — | — | C36 | — | 0.5 | SL8-A-4 | — | — | — |
| 5 | — | — | C37 | — | 0.5 | SL8-A-26 | — | — | — |
| 5 | — | — | E5 | — | 0.5 | COIL1-TRG | — | — | — |
| 6 | — | — | E6 | — | 0.5 | COIL2-TRG | — | — | — |
| 6 | — | — | C38 | — | 0.5 | SL8-A-27 | — | — | — |
| 7 | — | — | E7 | — | 0.5 | COIL3-TRG | — | — | — |
| 7 | — | — | C39 | — | 0.5 | SL8-A-28 | — | — | — |
| 8 | — | — | E8 | — | 0.5 | COIL4-TRG | — | — | — |
| 8 | — | — | C40 | — | 0.5 | SL8-A-29 | — | — | — |
| 9 | — | — | C41 | — | 0.5 | SL8-B-5 | — | — | — |
| 9 | — | — | E9 | — | 0.5 | CKP-SIG | — | — | — |
| 10 | — | — | C42 | — | 0.5 | SL8-B-10 | — | — | — |
| 10 | — | — | E10 | — | 0.5 | CKP-GND | — | — | — |
| 11 | — | — | C43 | — | 0.5 | SL8-B-7 | — | — | — |
| 11 | — | — | E11 | — | 0.5 | CMPA-SIG | — | — | — |
| 12 | — | — | E12 | — | 0.5 | CMPA-GND | — | — | — |
| 12 | — | — | C44 | — | 0.5 | SL8-B-10 | — | — | — |
| 13 | — | — | E13 | — | 0.5 | CMPB-SIG | — | — | — |
| 13 | — | — | C45 | — | 0.5 | SL8-A-20 | — | — | — |
| 14 | — | — | E14 | — | 0.5 | CMPB-GND | — | — | — |
| 14 | — | — | C46 | — | 0.5 | SL8-B-10 | — | — | — |
| 15 | — | — | C47 | — | 0.5 | SL8-B-11 | — | — | — |
| 15 | — | — | E15 | — | 0.5 | TPS-SIG | — | — | — |
| 16 | — | — | E16 | — | 0.5 | TPS-VCC | — | — | — |
| 16 | — | — | C48 | — | 0.5 | SL8-B-2 | — | — | — |
| 17 | — | — | C49 | — | 0.5 | SL8-B-10 | — | — | — |
| 17 | — | — | E17 | — | 0.5 | TPS-GND | — | — | — |
| 18 | — | — | E18 | — | 0.5 | MAP-SIG | — | — | — |
| 18 | — | — | C50 | — | 0.5 | SL8-B-12 | — | — | — |
| 19 | — | — | C51 | — | 0.5 | SL8-B-2 | — | — | — |
| 19 | — | — | E19 | — | 0.5 | MAP-VCC | — | — | — |
| 20 | — | — | C52 | — | 0.5 | SL8-B-10 | — | — | — |
| 20 | — | — | E20 | — | 0.5 | MAP-GND | — | — | — |
| 21 | — | — | C53 | — | 0.5 | SL8-B-20 | — | — | — |
| 21 | — | — | E21 | — | 0.5 | IAT-SIG | — | — | — |
| 22 | — | — | E22 | — | 0.5 | IAT-GND | — | — | — |
| 22 | — | — | C54 | — | 0.5 | SL8-B-10 | — | — | — |
| 23 | — | — | C55 | — | 0.5 | SL8-B-21 | — | — | — |
| 23 | — | — | E23 | — | 0.5 | ECT-SIG | — | — | — |
| 24 | — | — | E24 | — | 0.5 | ECT-GND | — | — | — |
| 24 | — | — | C56 | — | 0.5 | SL8-B-10 | — | — | — |
| 25 | — | — | E25 | — | 0.5 | KNOCK-SIG | — | — | — |
| 25 | — | — | C57 | — | 0.5 | SL8-B-16 | — | — | — |
| 26 | — | — | C58 | — | 0.5 | SL8-B-10 | — | — | — |
| 26 | — | — | E26 | — | 0.5 | KNOCK-GND | — | — | — |
| 27 | — | — | C59 | — | 0.5 | SL8-A-18 | — | — | — |
| 27 | — | — | E27 | — | 0.5 | VTC-A | — | — | — |
| 28 | — | — | E28 | — | 0.5 | VTC-B | — | — | — |
| 28 | — | — | C60 | — | 0.5 | SL8-A-19 | — | — | — |
| 29 | — | — | E29 | — | 0.5 | VTEC-SIG | — | — | — |
| 29 | — | — | C61 | — | 0.5 | SL8-A-10 | — | — | — |
| 30 | — | — | C62 | — | 0.5 | SL8-A-11 | — | — | — |
| 30 | — | — | E30 | — | 0.5 | IACV-SIG | — | — | — |
| 31 | — | — | C63 | — | 0.5 | SL8-A-21 | — | — | — |
| 31 | — | — | E31 | — | 0.5 | VTPSW-SIG | — | — | — |
| 32 | — | — | C64 | — | 0.5 | SL8-B-10 | — | — | — |
| 32 | — | — | E32 | — | 0.5 | VTPSW-GND | — | — | — |
CKP
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | CKP signal | — | E9 | — | 0.5 | BHD-9 | — | — | — |
| 12V | CKP +12V | — | P16 | — | 0.85 | SP-12V-1 | — | — | — |
| VCC | — | — | — | — | — | — | — | — | — |
| GND | CKP sensor ground | — | E10 | — | 0.5 | BHD-10 | — | — | — |
CMPA
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | CMP signal | — | E11 | — | 0.5 | BHD-11 | — | — | — |
| 12V | CMP +12V | — | P17 | — | 0.85 | SP-12V-1 | — | — | — |
| VCC | — | — | — | — | — | — | — | — | — |
| GND | CMP sensor ground | — | E12 | — | 0.5 | BHD-12 | — | — | — |
CMPB
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | CMP signal | — | E13 | — | 0.5 | BHD-13 | — | — | — |
| 12V | CMP +12V | — | P18 | — | 0.85 | SP-12V-1 | — | — | — |
| VCC | — | — | — | — | — | — | — | — | — |
| GND | CMP sensor ground | — | E14 | — | 0.5 | BHD-14 | — | — | — |
COIL1
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| TRG | Igniter trigger | — | E5 | — | 0.5 | BHD-5 | — | — | — |
| 12V | Coil +12V | — | P12 | — | 0.85 | SP-12V-1 | — | — | — |
| GND | Coil ground | — | P22 | — | 0.85 | SP-GND-1 | — | — | — |
COIL2
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| TRG | Igniter trigger | — | E6 | — | 0.5 | BHD-6 | — | — | — |
| 12V | Coil +12V | — | P13 | — | 0.85 | SP-12V-1 | — | — | — |
| GND | Coil ground | — | P23 | — | 0.85 | SP-GND-1 | — | — | — |
COIL3
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| TRG | Igniter trigger | — | E7 | — | 0.5 | BHD-7 | — | — | — |
| 12V | Coil +12V | — | P14 | — | 0.85 | SP-12V-1 | — | — | — |
| GND | Coil ground | — | P24 | — | 0.85 | SP-GND-1 | — | — | — |
COIL4
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| TRG | Igniter trigger | — | E8 | — | 0.5 | BHD-8 | — | — | — |
| 12V | Coil +12V | — | P15 | — | 0.85 | SP-12V-1 | — | — | — |
| GND | Coil ground | — | P25 | — | 0.85 | SP-GND-1 | — | — | — |
ECT
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | ECT signal | — | E23 | — | 0.5 | BHD-23 | — | — | — |
| GND | ECT sensor ground | — | E24 | — | 0.5 | BHD-24 | — | — | — |
IACV
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | IACV low side | — | E30 | — | 0.5 | BHD-30 | — | — | — |
| 12V | IACV +12V | — | P20 | — | 0.85 | SP-12V-1 | — | — | — |
IAT
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | IAT signal | — | E21 | — | 0.5 | BHD-21 | — | — | — |
| GND | IAT sensor ground | — | E22 | — | 0.5 | BHD-22 | — | — | — |
IGN
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | P2 | — | 0.5 | RELAY-R-COIL+ | — | — | — |
| 1 | — | — | P3 | — | 0.5 | SL8-B-4 | — | — | — |
INJ1
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | Injector low side | — | E1 | — | 0.5 | BHD-1 | — | — | — |
| 12V | Injector +12V (main relay) | — | P8 | — | 0.85 | SP-12V-1 | — | — | — |
INJ2
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | Injector low side | — | E2 | — | 0.5 | BHD-2 | — | — | — |
| 12V | Injector +12V (main relay) | — | P9 | — | 0.85 | SP-12V-1 | — | — | — |
INJ3
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | Injector low side | — | E3 | — | 0.5 | BHD-3 | — | — | — |
| 12V | Injector +12V (main relay) | — | P10 | — | 0.85 | SP-12V-1 | — | — | — |
INJ4
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | Injector low side | — | E4 | — | 0.5 | BHD-4 | — | — | — |
| 12V | Injector +12V (main relay) | — | P11 | — | 0.85 | SP-12V-1 | — | — | — |
KNOCK
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | Knock signal | — | E25 | — | 0.5 | BHD-25 | — | — | — |
| GND | Knock shield/return | — | E26 | — | 0.5 | BHD-26 | — | — | — |
LAF
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| IP | LAF pump current (Ip) | — | — | — | — | — | — | — | — |
| VS | LAF Nernst cell (Vs) | — | — | — | — | — | — | — | — |
| HTR | LAF heater low side | — | — | — | — | — | — | — | — |
| HTR+ | LAF heater supply | — | — | — | — | — | — | — | — |
MAP
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | MAP signal | — | E18 | — | 0.5 | BHD-18 | — | — | — |
| VCC | MAP 5V supply | — | E19 | — | 0.5 | BHD-19 | — | — | — |
| GND | MAP sensor ground | — | E20 | — | 0.5 | BHD-20 | — | — | — |
O2
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | Secondary O2 signal | — | — | — | — | — | — | — | — |
| GND | O2 signal ground | — | — | — | — | — | — | — | — |
| HTR | O2 heater low side | — | — | — | — | — | — | — | — |
| HTR+ | O2 heater supply | — | — | — | — | — | — | — | — |
RELAY-R
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| COIL+ | Relay coil positive (ignition-switched +12V) | — | P2 | — | 0.5 | IGN-1 | — | — | — |
| COIL- | Relay coil negative (ECU low-side driver) | — | P4 | — | 0.5 | SL8-B-3 | — | — | — |
| IN | Relay contact input (battery + via main fuse) | — | P1 | — | 0.85 | BATT-P-+ | — | — | — |
| OUT | Relay contact output (switched +12V bus) | — | P5 | — | 0.85 | SP-12V-1 | — | — | — |
SL8-A
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injection channel 1 | — | C33 | — | 0.5 | BHD-1 | — | — | — |
| 2 | Injection channel 2 | — | C34 | — | 0.5 | BHD-2 | — | — | — |
| 3 | Injection channel 3 | — | C35 | — | 0.5 | BHD-3 | — | — | — |
| 4 | Injection channel 4 | — | C36 | — | 0.5 | BHD-4 | — | — | — |
| 5 | Injection channel 5 | — | — | — | — | — | — | — | — |
| 6 | Injection channel 6 | — | — | — | — | — | — | — | — |
| 7 | Injection channel 7 | — | — | — | — | — | — | — | — |
| 8 | Injection channel 8 | — | — | — | — | — | — | — | — |
| 9 | Sensor supply 8V | — | — | — | — | — | — | — | — |
| 10 | Auxiliary output 1 | — | C61 | — | 0.5 | BHD-29 | — | — | — |
| 11 | Auxiliary output 2 | — | C62 | — | 0.5 | BHD-30 | — | — | — |
| 12 | Auxiliary output 3 | — | — | — | — | — | — | — | — |
| 13 | Auxiliary output 4 | — | — | — | — | — | — | — | — |
| 14 | Auxiliary output 5 | — | — | — | — | — | — | — | — |
| 15 | Auxiliary output 6 | — | — | — | — | — | — | — | — |
| 16 | Auxiliary output 7 | — | — | — | — | — | — | — | — |
| 17 | Auxiliary output 8 | — | — | — | — | — | — | — | — |
| 18 | Auxiliary output 9 | — | C59 | — | 0.5 | BHD-27 | — | — | — |
| 19 | Auxiliary output 10 | — | C60 | — | 0.5 | BHD-28 | — | — | — |
| 20 | Digital input 1 | — | C45 | — | 0.5 | BHD-13 | — | — | — |
| 21 | Digital input 2 | — | C63 | — | 0.5 | BHD-31 | — | — | — |
| 22 | Digital input 3 | — | — | — | — | — | — | — | — |
| 23 | Digital input 4 | — | — | — | — | — | — | — | — |
| 24 | Digital input 5 | — | — | — | — | — | — | — | — |
| 25 | Digital input 6 | — | — | — | — | — | — | — | — |
| 26 | Ignition channel 1 | — | C37 | — | 0.5 | BHD-5 | — | — | — |
| 27 | Ignition channel 2 | — | C38 | — | 0.5 | BHD-6 | — | — | — |
| 28 | Ignition channel 3 | — | C39 | — | 0.5 | BHD-7 | — | — | — |
| 29 | Ignition channel 4 | — | C40 | — | 0.5 | BHD-8 | — | — | — |
| 30 | Ignition channel 5 | — | — | — | — | — | — | — | — |
| 31 | Ignition channel 6 | — | — | — | — | — | — | — | — |
| 32 | Ignition channel 7 | — | — | — | — | — | — | — | — |
| 33 | Ignition channel 8 | — | — | — | — | — | — | — | — |
| 34 | Aux 9–10 14V supply | — | P7 | — | 0.85 | SP-12V-1 | — | — | — |
SL8-B
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | ECU 14V supply | — | P6 | — | 0.85 | SP-12V-1 | — | — | — |
| 2 | Sensor supply Vref1 5.0V | — | C48 | — | 0.5 | BHD-16 | — | — | — |
| 2 | Sensor supply Vref1 5.0V | — | C51 | — | 0.5 | BHD-19 | — | — | — |
| 3 | EFI relay output (low side, 200 mA) | — | P4 | — | 0.5 | RELAY-R-COIL- | — | — | — |
| 4 | Ignition switch input | — | P3 | — | 0.5 | IGN-1 | — | — | — |
| 5 | Crank index sensor + | — | C41 | — | 0.5 | BHD-9 | — | — | — |
| 6 | Crank index sensor − | — | — | — | — | — | — | — | — |
| 7 | Sync sensor + | — | C43 | — | 0.5 | BHD-11 | — | — | — |
| 8 | Sync sensor − | — | — | — | — | — | — | — | — |
| 9 | Shield (crank/sync/knock) | — | — | — | — | — | — | — | — |
| 10 | Analog sensor 0V reference | — | C52 | — | 0.5 | BHD-20 | — | — | — |
| 10 | Analog sensor 0V reference | — | C54 | — | 0.5 | BHD-22 | — | — | — |
| 10 | Analog sensor 0V reference | — | C56 | — | 0.5 | BHD-24 | — | — | — |
| 10 | Analog sensor 0V reference | — | C58 | — | 0.5 | BHD-26 | — | — | — |
| 10 | Analog sensor 0V reference | — | C64 | — | 0.5 | BHD-32 | — | — | — |
| 10 | Analog sensor 0V reference | — | C49 | — | 0.5 | BHD-17 | — | — | — |
| 10 | Analog sensor 0V reference | — | C46 | — | 0.5 | BHD-14 | — | — | — |
| 10 | Analog sensor 0V reference | — | C44 | — | 0.5 | BHD-12 | — | — | — |
| 10 | Analog sensor 0V reference | — | C42 | — | 0.5 | BHD-10 | — | — | — |
| 11 | Analog input 1 | — | C47 | — | 0.5 | BHD-15 | — | — | — |
| 12 | Analog input 2 | — | C50 | — | 0.5 | BHD-18 | — | — | — |
| 13 | Analog input 3 | — | — | — | — | — | — | — | — |
| 14 | Analog input 4 | — | — | — | — | — | — | — | — |
| 15 | Analog input 5 | — | — | — | — | — | — | — | — |
| 16 | Knock 1 + | — | C57 | — | 0.5 | BHD-25 | — | — | — |
| 17 | Knock 1 − | — | — | — | — | — | — | — | — |
| 18 | ECU ground | — | P26 | — | 0.85 | SP-GND-1 | — | — | — |
| 19 | Analog input 6 | — | — | — | — | — | — | — | — |
| 20 | Analog input 7 (switchable 1k pull-up) | — | C53 | — | 0.5 | BHD-21 | — | — | — |
| 21 | Analog input 8 (switchable 1k pull-up) | — | C55 | — | 0.5 | BHD-23 | — | — | — |
| 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 | — | P27 | — | 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-12V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | P20 | — | 0.85 | IACV-12V | — | — | — |
| 1 | — | — | P18 | — | 0.85 | CMPB-12V | — | — | — |
| 1 | — | — | P5 | — | 0.85 | RELAY-R-OUT | — | — | — |
| 1 | — | — | P6 | — | 0.85 | SL8-B-1 | — | — | — |
| 1 | — | — | P7 | — | 0.85 | SL8-A-34 | — | — | — |
| 1 | — | — | P8 | — | 0.85 | INJ1-12V | — | — | — |
| 1 | — | — | P9 | — | 0.85 | INJ2-12V | — | — | — |
| 1 | — | — | P10 | — | 0.85 | INJ3-12V | — | — | — |
| 1 | — | — | P11 | — | 0.85 | INJ4-12V | — | — | — |
| 1 | — | — | P12 | — | 0.85 | COIL1-12V | — | — | — |
| 1 | — | — | P13 | — | 0.85 | COIL2-12V | — | — | — |
| 1 | — | — | P14 | — | 0.85 | COIL3-12V | — | — | — |
| 1 | — | — | P15 | — | 0.85 | COIL4-12V | — | — | — |
| 1 | — | — | P16 | — | 0.85 | CKP-12V | — | — | — |
| 1 | — | — | P17 | — | 0.85 | CMPA-12V | — | — | — |
| 1 | — | — | P19 | — | 0.85 | VTEC-12V | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | P21 | — | 0.85 | BATT-P-- | — | — | — |
| 1 | — | — | P22 | — | 0.85 | COIL1-GND | — | — | — |
| 1 | — | — | P23 | — | 0.85 | COIL2-GND | — | — | — |
| 1 | — | — | P24 | — | 0.85 | COIL3-GND | — | — | — |
| 1 | — | — | P25 | — | 0.85 | COIL4-GND | — | — | — |
| 1 | — | — | P26 | — | 0.85 | SL8-B-18 | — | — | — |
| 1 | — | — | P27 | — | 0.85 | SL8-B-26 | — | — | — |
TPS
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | TPS signal | — | E15 | — | 0.5 | BHD-15 | — | — | — |
| VCC | TPS 5V supply | — | E16 | — | 0.5 | BHD-16 | — | — | — |
| GND | TPS sensor ground | — | E17 | — | 0.5 | BHD-17 | — | — | — |
VTC
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | VTC solenoid + | — | E27 | — | 0.5 | BHD-27 | — | — | — |
| B | VTC solenoid - | — | E28 | — | 0.5 | BHD-28 | — | — | — |
VTEC
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | VTEC solenoid low side | — | E29 | — | 0.5 | BHD-29 | — | — | — |
| 12V | VTEC solenoid +12V | — | P19 | — | 0.85 | SP-12V-1 | — | — | — |
VTPSW
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| SIG | VTEC pressure switch | — | E31 | — | 0.5 | BHD-31 | — | — | — |
| GND | Switch ground | — | E32 | — | 0.5 | BHD-32 | — | — | — |
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 |
|---|---|---|---|---|---|---|---|
| E1 | INJ1-SIG | BHD-1 | 0.5 | no route | Injector low side | — | |
| E2 | INJ2-SIG | BHD-2 | 0.5 | no route | Injector low side | — | |
| E3 | INJ3-SIG | BHD-3 | 0.5 | no route | Injector low side | — | |
| E4 | INJ4-SIG | BHD-4 | 0.5 | no route | Injector low side | — | |
| E5 | COIL1-TRG | BHD-5 | 0.5 | no route | Igniter trigger | — | |
| E6 | COIL2-TRG | BHD-6 | 0.5 | no route | Igniter trigger | — | |
| E7 | COIL3-TRG | BHD-7 | 0.5 | no route | Igniter trigger | — | |
| E8 | COIL4-TRG | BHD-8 | 0.5 | no route | Igniter trigger | — | |
| E9 | CKP-SIG | BHD-9 | 0.5 | no route | CKP signal | — | |
| P1 | BATT-P-+ | RELAY-R-IN | 0.85 | no route | Battery positive | — | |
| P2 | IGN-1 | RELAY-R-COIL+ | 0.5 | no route | Relay coil positive (ignition-switched +12V) | — | |
| P3 | IGN-1 | SL8-B-4 | 0.5 | no route | Ignition switch input | — | |
| P4 | RELAY-R-COIL- | SL8-B-3 | 0.5 | no route | Relay coil negative (ECU low-side driver) | — | |
| P5 | RELAY-R-OUT | SP-12V-1 | 0.85 | no route | Relay contact output (switched +12V bus) | — | |
| P6 | SP-12V-1 | SL8-B-1 | 0.85 | no route | ECU 14V supply | — | |
| P7 | SP-12V-1 | SL8-A-34 | 0.85 | no route | Aux 9–10 14V supply | — | |
| P8 | SP-12V-1 | INJ1-12V | 0.85 | no route | Injector +12V (main relay) | — | |
| P9 | SP-12V-1 | INJ2-12V | 0.85 | no route | Injector +12V (main relay) | — | |
| C33 | BHD-1 | SL8-A-1 | 0.5 | no route | Injection channel 1 | — | |
| C34 | BHD-2 | SL8-A-2 | 0.5 | no route | Injection channel 2 | — | |
| C35 | BHD-3 | SL8-A-3 | 0.5 | no route | Injection channel 3 | — | |
| C36 | BHD-4 | SL8-A-4 | 0.5 | no route | Injection channel 4 | — | |
| C37 | BHD-5 | SL8-A-26 | 0.5 | no route | Ignition channel 1 | — | |
| C38 | BHD-6 | SL8-A-27 | 0.5 | no route | Ignition channel 2 | — | |
| C39 | BHD-7 | SL8-A-28 | 0.5 | no route | Ignition channel 3 | — | |
| C40 | BHD-8 | SL8-A-29 | 0.5 | no route | Ignition channel 4 | — | |
| C41 | BHD-9 | SL8-B-5 | 0.5 | no route | Crank index sensor + | — | |
| C42 | BHD-10 | SL8-B-10 | 0.5 | no route | Analog sensor 0V reference | — | |
| C43 | BHD-11 | SL8-B-7 | 0.5 | no route | Sync sensor + | — | |
| C44 | BHD-12 | SL8-B-10 | 0.5 | no route | Analog sensor 0V reference | — | |
| C45 | BHD-13 | SL8-A-20 | 0.5 | no route | Digital input 1 | — | |
| C46 | BHD-14 | SL8-B-10 | 0.5 | no route | Analog sensor 0V reference | — | |
| C47 | BHD-15 | SL8-B-11 | 0.5 | no route | Analog input 1 | — | |
| C48 | BHD-16 | SL8-B-2 | 0.5 | no route | Sensor supply Vref1 5.0V | — | |
| C49 | BHD-17 | SL8-B-10 | 0.5 | no route | Analog sensor 0V reference | — | |
| C50 | BHD-18 | SL8-B-12 | 0.5 | no route | Analog input 2 | — | |
| C51 | BHD-19 | SL8-B-2 | 0.5 | no route | Sensor supply Vref1 5.0V | — | |
| C52 | BHD-20 | SL8-B-10 | 0.5 | no route | Analog sensor 0V reference | — | |
| C53 | BHD-21 | SL8-B-20 | 0.5 | no route | Analog input 7 (switchable 1k pull-up) | — | |
| C54 | BHD-22 | SL8-B-10 | 0.5 | no route | Analog sensor 0V reference | — | |
| C55 | BHD-23 | SL8-B-21 | 0.5 | no route | Analog input 8 (switchable 1k pull-up) | — | |
| C56 | BHD-24 | SL8-B-10 | 0.5 | no route | Analog sensor 0V reference | — | |
| C57 | BHD-25 | SL8-B-16 | 0.5 | no route | Knock 1 + | — | |
| C58 | BHD-26 | SL8-B-10 | 0.5 | no route | Analog sensor 0V reference | — | |
| C59 | BHD-27 | SL8-A-18 | 0.5 | no route | Auxiliary output 9 | — | |
| C60 | BHD-28 | SL8-A-19 | 0.5 | no route | Auxiliary output 10 | — | |
| C61 | BHD-29 | SL8-A-10 | 0.5 | no route | Auxiliary output 1 | — | |
| C62 | BHD-30 | SL8-A-11 | 0.5 | no route | Auxiliary output 2 | — | |
| C63 | BHD-31 | SL8-A-21 | 0.5 | no route | Digital input 2 | — | |
| C64 | BHD-32 | SL8-B-10 | 0.5 | no route | Analog sensor 0V reference | — | |
| E10 | CKP-GND | BHD-10 | 0.5 | no route | CKP sensor ground | — | |
| E11 | CMPA-SIG | BHD-11 | 0.5 | no route | CMP signal | — | |
| E12 | CMPA-GND | BHD-12 | 0.5 | no route | CMP sensor ground | — | |
| E13 | CMPB-SIG | BHD-13 | 0.5 | no route | CMP signal | — | |
| E14 | CMPB-GND | BHD-14 | 0.5 | no route | CMP sensor ground | — | |
| E15 | TPS-SIG | BHD-15 | 0.5 | no route | TPS signal | — | |
| E16 | TPS-VCC | BHD-16 | 0.5 | no route | TPS 5V supply | — | |
| E17 | TPS-GND | BHD-17 | 0.5 | no route | TPS sensor ground | — | |
| E18 | MAP-SIG | BHD-18 | 0.5 | no route | MAP signal | — | |
| E19 | MAP-VCC | BHD-19 | 0.5 | no route | MAP 5V supply | — | |
| E20 | MAP-GND | BHD-20 | 0.5 | no route | MAP sensor ground | — | |
| E21 | IAT-SIG | BHD-21 | 0.5 | no route | IAT signal | — | |
| E22 | IAT-GND | BHD-22 | 0.5 | no route | IAT sensor ground | — | |
| E23 | ECT-SIG | BHD-23 | 0.5 | no route | ECT signal | — | |
| E24 | ECT-GND | BHD-24 | 0.5 | no route | ECT sensor ground | — | |
| E25 | KNOCK-SIG | BHD-25 | 0.5 | no route | Knock signal | — | |
| E26 | KNOCK-GND | BHD-26 | 0.5 | no route | Knock shield/return | — | |
| E27 | VTC-A | BHD-27 | 0.5 | no route | VTC solenoid + | — | |
| E28 | VTC-B | BHD-28 | 0.5 | no route | VTC solenoid - | — | |
| E29 | VTEC-SIG | BHD-29 | 0.5 | no route | VTEC solenoid low side | — | |
| E30 | IACV-SIG | BHD-30 | 0.5 | no route | IACV low side | — | |
| E31 | VTPSW-SIG | BHD-31 | 0.5 | no route | VTEC pressure switch | — | |
| E32 | VTPSW-GND | BHD-32 | 0.5 | no route | Switch ground | — | |
| P10 | SP-12V-1 | INJ3-12V | 0.85 | no route | Injector +12V (main relay) | — | |
| P11 | SP-12V-1 | INJ4-12V | 0.85 | no route | Injector +12V (main relay) | — | |
| P12 | SP-12V-1 | COIL1-12V | 0.85 | no route | Coil +12V | — | |
| P13 | SP-12V-1 | COIL2-12V | 0.85 | no route | Coil +12V | — | |
| P14 | SP-12V-1 | COIL3-12V | 0.85 | no route | Coil +12V | — | |
| P15 | SP-12V-1 | COIL4-12V | 0.85 | no route | Coil +12V | — | |
| P16 | SP-12V-1 | CKP-12V | 0.85 | no route | CKP +12V | — | |
| P17 | SP-12V-1 | CMPA-12V | 0.85 | no route | CMP +12V | — | |
| P18 | SP-12V-1 | CMPB-12V | 0.85 | no route | CMP +12V | — | |
| P19 | SP-12V-1 | VTEC-12V | 0.85 | no route | VTEC solenoid +12V | — | |
| P20 | SP-12V-1 | IACV-12V | 0.85 | no route | IACV +12V | — | |
| P21 | BATT-P-- | SP-GND-1 | 0.85 | no route | Battery negative / chassis ground | — | |
| P22 | SP-GND-1 | COIL1-GND | 0.85 | no route | Coil ground | — | |
| P23 | SP-GND-1 | COIL2-GND | 0.85 | no route | Coil ground | — | |
| P24 | SP-GND-1 | COIL3-GND | 0.85 | no route | Coil ground | — | |
| P25 | SP-GND-1 | COIL4-GND | 0.85 | no route | Coil ground | — | |
| P26 | SP-GND-1 | SL8-B-18 | 0.85 | no route | ECU ground | — | |
| P27 | SP-GND-1 | SL8-B-26 | 0.85 | no route | ECU ground | — |
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 | 6189-0553 | 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 | HONDA-K-ECT | Honda | K-series ECT sensor plug (P/N unknown; 2-way) | 1.000 | ea |
| connector | HONDA-K-IACV | Honda | K-series IACV plug (P/N unknown; 2-way) | 1.000 | ea |
| connector | HONDA-K-IAT | Honda | K-series IAT sensor plug (P/N unknown; 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-LAF | Denso | K-series LAF O2 sensor plug (P/N unknown; 4-way) | 1.000 | ea |
| connector | HONDA-K-O2 | Denso | K-series secondary O2 sensor plug (P/N unknown; 4-way) | 1.000 | ea |
| connector | HONDA-K-VTC | Honda | K-series VTC solenoid plug (P/N unknown; 2-way) | 1.000 | ea |
| connector | HONDA-K-VTPSW | Honda | K-series VTEC oil-pressure switch plug (P/N unknown; 2-way) | 1.000 | ea |
| connector | HONDA-K-VTS | Honda | K-series VTEC solenoid plug (P/N unknown; 2-way) | 1.000 | ea |
| connector | K-BHD-01 | hx | K-swap engine bulkhead, 32-way (app-defined; physical part TBD per D2) | 1.000 | ea |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| cam | CMPA | CMP signal | hall | SL8-B-7 | Sync sensor + | cam_hall | — |
| cam | CMPB | CMP signal | hall | SL8-A-20 | Digital input 1 | 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 | — | SL8-A-26 | Ignition channel 1 | ignition | — |
| coil | COIL2 | Igniter trigger | — | SL8-A-27 | Ignition channel 2 | ignition | — |
| coil | COIL3 | Igniter trigger | — | SL8-A-28 | Ignition channel 3 | ignition | — |
| coil | COIL4 | Igniter trigger | — | SL8-A-29 | Ignition channel 4 | ignition | — |
| crank | CKP | CKP signal | hall | SL8-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 | — | SL8-A-11 | Auxiliary output 2 | ls_hs | — |
| injector | INJ1 | Injector low side | — | SL8-A-1 | Injection channel 1 | injector | — |
| injector | INJ2 | Injector low side | — | SL8-A-2 | Injection channel 2 | injector | — |
| injector | INJ3 | Injector low side | — | SL8-A-3 | Injection channel 3 | injector | — |
| injector | INJ4 | Injector low side | — | SL8-A-4 | Injection channel 4 | injector | — |
| knock | KNOCK | Knock signal | — | SL8-B-16 | Knock 1 + | knock | — |
| map | MAP | MAP signal | 0_5v | SL8-B-12 | Analog input 2 | analog_0_5 | — |
| switch | VTPSW | VTEC pressure switch | switch | SL8-A-21 | Digital input 2 | switch_in | — |
| temp | ECT | ECT signal | thermistor | SL8-B-21 | Analog input 8 (switchable 1k pull-up) | analog_0_5 | — |
| temp | IAT | IAT signal | thermistor | SL8-B-20 | Analog input 7 (switchable 1k pull-up) | analog_0_5 | — |
| tps | TPS | TPS signal | 0_5v | SL8-B-11 | Analog input 1 | analog_0_5 | — |
| vtc | VTC | VTC solenoid + | — | SL8-A-18 | Auxiliary output 9 | hbridge | — |
| vtc | VTC | VTC solenoid - | — | SL8-A-19 | Auxiliary output 10 | hbridge | — |
| vtec | VTEC | VTEC solenoid low side | — | SL8-A-10 | Auxiliary output 1 | ls_hs | — |
Findings
Open (6)
| Severity | Code | Subject | Message |
|---|---|---|---|
| warn | DATASET_GAP | K-series CKP sensor J | 1 of 3 cavities on K-series CKP sensor J have no pin data (VCC). Anything there is invisible to these checks. |
| warn | DATASET_GAP | K-series CMP sensor J | 1 of 3 cavities on K-series CMP sensor J have no pin data (VCC). Anything there is invisible to these checks. |
| warn | NET_FAMILY | SL8-A-26 ↔ COIL1-TRG | SL8-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 | SL8-A-27 ↔ COIL2-TRG | SL8-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 | SL8-A-28 ↔ COIL3-TRG | SL8-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 | SL8-A-29 ↔ COIL4-TRG | SL8-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. |
Accepted (3)
| Code | Subject | Reason | By |
|---|---|---|---|
| PHYS_REQUIRED_OPEN | LAF-IP | Primary LAF wideband sensor needs an external wideband controller (no onboard lambda). Deferred. | mapping-proposal |
| PHYS_REQUIRED_OPEN | LAF-VS | Primary LAF wideband sensor needs an external wideband controller (no onboard lambda). Deferred. | mapping-proposal |
| NET_FAMILY | SL8-B-4 ↔ RELAY-R-COIL+ | Ignition-switch sense (SL8-B-4) also feeds the main relay coil positive. The ECU reads key-on there and holds the main relay via its EFI relay output. Intended Emtron topology. | mapping-proposal |
Notes
K20A2 engine harness to the K-BHD-01 bulkhead, plus the ECU sub-harness to SL8. The engine→bulkhead side is identical across ECUs; only the bulkhead→ECU side is regenerated. Power distribution wired (battery / main relay / switched +12V bus / power grounds). Fuse ratings and the main-feed gauge are left for the builder (K20 loads, not Honda FSM).
Sources
| Reliability | Kind | Title | URL |
|---|---|---|---|
| 4 | datasheet | Emtron SL4/SL6/SL8 ECU datasheets | https://docs.emtronaustralia.com.au/engine-management/datasheets/index.html |
| 4 | vendor_doc | Emtron SL4/SL6/SL8 pinout pages | https://docs.emtronaustralia.com.au/engine-management/wiring/index.html |
| 4 | oem_wiring_diagram | 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 |
| 3 | forum | rusEFI Mazda Miata 2002 engine wiring | https://github.com/rusefi/rusefi/wiki/Mazda-Miata-2002 |
| 2 | forum | K-series engine harness sensor/actuator connectors (KSV Looms + Hybrid Racing cross-ref) | https://www.ksvlooms.com/ |