MX-5 Miata NB1 1999-00 (BP-4W) → Emtron KV12 (auto)
MX-5 Miata NB1 1999-00 (BP-4W) — Emtron — KV12
Drawn by Michael Gnankou · Rev 0 · proposal · 2026-10-05
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
KV12-A
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injection Channel 9 | — | W44 | — | 0.5 | OEM-3-Q | — | — | — |
| 2 | Injection Channel 10 | — | W45 | — | 0.5 | OEM-3-T | — | — | — |
| 3 | Injection Channel 11 | — | W46 | — | 0.5 | OEM-3-U | — | — | — |
| 4 | Injection Channel 12 | — | — | — | — | — | — | — | — |
| 5 | — | — | — | — | — | — | — | — | — |
| 6 | — | — | — | — | — | — | — | — | — |
| 7 | — | — | — | — | — | — | — | — | — |
| 8 | Ignition Channel 9 | — | — | — | — | — | — | — | — |
| 9 | Ignition Channel 10 | — | — | — | — | — | — | — | — |
| 10 | Lambda 1 Heater - | — | W33 | — | 0.5 | OEM-1-U | — | — | — |
| 11 | Lambda 2 Heater - | — | W34 | — | 0.5 | OEM-3-V | — | — | — |
| 12 | — | — | — | — | — | — | — | — | — |
| 13 | — | — | — | — | — | — | — | — | — |
| 14 | Ignition Channel 11 | — | — | — | — | — | — | — | — |
| 15 | Ignition Channel 12 | — | — | — | — | — | — | — | — |
| 16 | Lambda 1 Heater + | — | — | — | — | — | — | — | — |
| 17 | Lambda 2 Heater + | — | — | — | — | — | — | — | — |
| 18 | Lambda 1 Nernst Cell (Vs) | — | — | — | — | — | — | — | — |
| 19 | ECU Ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 20 | Lambda 2 Cal Resistor (CalR) | — | — | — | — | — | — | — | — |
| 21 | Lambda 2 Nernst Cell (Vs) | — | — | — | — | — | — | — | — |
| 22 | Lambda 2 Pump Cell (Ip) | — | — | — | — | — | — | — | — |
| 23 | Lambda 2 Virtual Ground (VGnd) | — | — | — | — | — | — | — | — |
| 24 | Lambda 1 Cal Resistor (CalR) | — | — | — | — | — | — | — | — |
| 25 | Lambda 1 Pump Cell (Ip) | — | — | — | — | — | — | — | — |
| 26 | Lambda 1 Virtual Ground (VGnd) | — | — | — | — | — | — | — | — |
KV12-B
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injection Channel 1 | — | W25 | — | 0.5 | OEM-3-W | — | — | — |
| 2 | Injection Channel 2 | — | W26 | — | 0.5 | OEM-3-X | — | — | — |
| 3 | Injection Channel 3 | — | W27 | — | 0.5 | OEM-3-Y | — | — | — |
| 4 | Injection Channel 4 | — | W28 | — | 0.5 | OEM-3-Z | — | — | — |
| 5 | Injection Channel 5 | — | W40 | — | 0.5 | OEM-2-N | — | — | — |
| 6 | Injection Channel 6 | — | W41 | — | 0.5 | OEM-2-O | — | — | — |
| 7 | Injection Channel 7 | — | W42 | — | 0.5 | OEM-2-P | — | — | — |
| 8 | Injection Channel 8 | — | W43 | — | 0.5 | OEM-3-L | — | — | — |
| 9 | ECU Ground | — | W11 | — | 0.85 | SP-GND-1 | — | — | — |
| 10 | Auxiliary Output 1 | — | W36 | — | 0.5 | OEM-1-E | — | — | — |
| 11 | Auxiliary Output 2 | — | W37 | — | 0.5 | OEM-1-O | — | — | — |
| 12 | Auxiliary Output 3 | — | W38 | — | 0.5 | OEM-1-Q | — | — | — |
| 13 | Auxiliary Output 4 | — | W39 | — | 0.5 | OEM-2-M | — | — | — |
| 14 | Auxiliary Output 5 | — | W30 | — | 0.5 | OEM-1-R | — | — | — |
| 15 | Auxiliary Output 6 | — | W31 | — | 0.5 | OEM-1-S | — | — | — |
| 16 | Auxiliary Output 7 | — | W32 | — | 0.5 | OEM-3-N | — | — | — |
| 17 | Auxiliary Output 8 | — | W35 | — | 0.5 | OEM-3-O | — | — | — |
| 18 | Auxiliary Output 9 | — | — | — | — | — | — | — | — |
| 19 | Auxiliary Output 10 | — | — | — | — | — | — | — | — |
| 20 | Auxiliary Output 11 | — | — | — | — | — | — | — | — |
| 21 | Auxiliary Output 12 | — | — | — | — | — | — | — | — |
| 22 | Auxiliary Output 13 | — | — | — | — | — | — | — | — |
| 23 | Auxiliary Output 14 | — | — | — | — | — | — | — | — |
| 24 | Auxiliary Output 15 | — | — | — | — | — | — | — | — |
| 25 | Auxiliary Output 16 | — | — | — | — | — | — | — | — |
| 26 | Ignition Channel 1 | — | W23 | — | 0.5 | OEM-3-G | — | — | — |
| 27 | Ignition Channel 2 | — | W24 | — | 0.5 | OEM-3-H | — | — | — |
| 28 | Ignition Channel 3 | — | — | — | — | — | — | — | — |
| 29 | Ignition Channel 4 | — | — | — | — | — | — | — | — |
| 30 | Ignition Channel 5 | — | — | — | — | — | — | — | — |
| 31 | Ignition Channel 6 | — | — | — | — | — | — | — | — |
| 32 | Ignition Channel 7 | — | — | — | — | — | — | — | — |
| 33 | Ignition Channel 8 | — | — | — | — | — | — | — | — |
| 34 | ECU Ground | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
KV12-C
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | ECU Ground | — | W12 | — | 0.85 | SP-GND-1 | — | — | — |
| 2 | Analog Input Channel 1 | — | W47 | — | 0.5 | OEM-2-L | — | — | — |
| 3 | Analog Input Channel 2 | — | W48 | — | 0.5 | OEM-3-E | — | — | — |
| 4 | Analog Input Channel 3 | — | W49 | — | 0.5 | OEM-2-C | — | — | — |
| 5 | Analog Input Channel 4 | — | W50 | — | 0.5 | OEM-3-J | — | — | — |
| 6 | Analog Input Channel 5 | — | W51 | — | 0.5 | OEM-2-E | — | — | — |
| 7 | Analog Input Channel 6 | — | W52 | — | 0.5 | OEM-2-B | — | — | — |
| 8 | Analog Input Channel 7 | — | W53 | — | 0.5 | OEM-2-A | — | — | — |
| 9 | Analog Input Channel 8 | — | W54 | — | 0.5 | OEM-3-K | — | — | — |
| 10 | Analog Input Channel 9 | — | W55 | — | 0.5 | OEM-3-S | — | — | — |
| 11 | Analog Input Channel 10 | — | — | — | — | — | — | — | — |
| 12 | Analog Input Channel 11 | — | — | — | — | — | — | — | — |
| 13 | Analog Input Channel 12 | — | — | — | — | — | — | — | — |
| 14 | Analog Input Channel 13 | — | — | — | — | — | — | — | — |
| 15 | Analog Input Channel 14 | — | — | — | — | — | — | — | — |
| 16 | Analog Input Channel 15 | — | — | — | — | — | — | — | — |
| 17 | Analog Sensor 0V Reference | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 18 | Digital Input 9 | — | — | — | — | — | — | — | — |
| 19 | Digital Input 10 | — | — | — | — | — | — | — | — |
| 20 | Digital Input 11 | — | — | — | — | — | — | — | — |
| 21 | Digital Input 12 | — | — | — | — | — | — | — | — |
| 22 | Digital Input 13 | — | — | — | — | — | — | — | — |
| 23 | Digital Input 14 | — | — | — | — | — | — | — | — |
| 24 | Analog Input Channel 16 | — | — | — | — | — | — | — | — |
| 25 | Analog Sensor 0V Reference | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 26 | ECU Ground | — | W13 | — | 0.85 | SP-GND-1 | — | — | — |
| 27 | Digital Input 1 | — | W56 | — | 0.5 | OEM-2-D | — | — | — |
| 28 | Digital Input 2 | — | W57 | — | 0.5 | OEM-1-F | — | — | — |
| 29 | Digital Input 3 | — | W58 | — | 0.5 | OEM-1-G | — | — | — |
| 30 | Digital Input 4 | — | W59 | — | 0.5 | OEM-1-P | — | — | — |
| 31 | Digital Input 5 | — | W60 | — | 0.5 | OEM-1-V | — | — | — |
| 32 | Digital Input 6 | — | W61 | — | 0.5 | OEM-3-I | — | — | — |
| 33 | Digital Input 7 | — | — | — | — | — | — | — | — |
| 34 | Digital Input 8 | — | — | — | — | — | — | — | — |
KV12-D
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | ECU 14V Supply | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 2 | Auxiliary Output 13-16 14V Supply | — | W4 | — | 0.85 | SP-14V-1 | — | — | — |
| 3 | Sensor Supply 8V | — | — | — | — | — | — | — | — |
| 4 | Crank Index Sensor + | — | W18 | — | 0.5 | OEM-2-J | — | — | — |
| 5 | Crank Index Sensor - | — | W19 | — | 0.5 | SP-0V-1 | — | — | — |
| 6 | Sync Sensor + | — | W20 | — | 0.5 | OEM-2-H | — | — | — |
| 7 | Sync Sensor - | — | W21 | — | 0.5 | SP-0V-1 | — | — | — |
| 8 | CAN 1H | — | — | — | — | — | — | — | — |
| 9 | EFI Relay Output (Low Side 200mA) | — | W29 | — | 0.5 | OEM-1-I | — | — | — |
| 10 | CAN 2H | — | — | — | — | — | — | — | — |
| 11 | Knock 1 + | — | W22 | — | 0.5 | OEM-2-F | — | — | — |
| 12 | Knock 1 - | — | — | — | — | — | — | — | — |
| 13 | Shield (Crank/Cam/ Knock) | — | — | — | — | — | — | — | — |
| 14 | CAN 1L | — | — | — | — | — | — | — | — |
| 15 | Ignition Switch Input | — | — | — | — | — | — | — | — |
| 16 | CAN 2L | — | — | — | — | — | — | — | — |
| 17 | Knock 2 + | — | — | — | — | — | — | — | — |
| 18 | Knock 2 - | — | — | — | — | — | — | — | — |
| 19 | Analog Output (0.0 - 5.0V) | — | — | — | — | — | — | — | — |
| 20 | Auxiliary Output 9-12 14V Supply | — | W5 | — | 0.85 | SP-14V-1 | — | — | — |
| 21 | Sensor Supply Vref1: 5.0V | — | W17 | — | 0.5 | OEM-2-I | — | — | — |
| 22 | Sensor Supply Vref2: 5.0V | — | — | — | — | — | — | — | — |
| 23 | Ethernet Tx + | — | — | — | — | — | — | — | — |
| 24 | Ethernet Tx - | — | — | — | — | — | — | — | — |
| 25 | Ethernet Rx + | — | — | — | — | — | — | — | — |
| 26 | Ethernet Rx - | — | — | — | — | — | — | — | — |
OEM-1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Constant +12V | — | — | — | — | — | — | — | — |
| B | ECU power +14V (main relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| E | Malfunction indicator lamp (MIL) | — | W36 | — | 0.5 | KV12-B-10 | — | — | — |
| F | Brake switch | — | W57 | — | 0.5 | KV12-C-28 | — | — | — |
| G | Power steering pressure switch | — | W58 | — | 0.5 | KV12-C-29 | — | — | — |
| I | Condenser fan relay | — | W29 | — | 0.5 | KV12-D-9 | — | — | — |
| O | Alternator control | — | W37 | — | 0.5 | KV12-B-11 | — | — | — |
| P | A/C request | — | W59 | — | 0.5 | KV12-C-30 | — | — | — |
| Q | Charge lamp | — | W38 | — | 0.5 | KV12-B-12 | — | — | — |
| R | Cooling fan relay | — | W30 | — | 0.5 | KV12-B-14 | — | — | — |
| S | A/C clutch relay | — | W31 | — | 0.5 | KV12-B-15 | — | — | — |
| U | Front O2 heater | — | W33 | — | 0.5 | KV12-A-10 | — | — | — |
| V | Neutral switch | — | W60 | — | 0.5 | KV12-C-31 | — | — | — |
OEM-2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Fuel tank pressure | — | W53 | — | 0.5 | KV12-C-8 | — | — | — |
| B | Intake air temperature (IAT) | — | W52 | — | 0.5 | KV12-C-7 | — | — | — |
| C | Front O2 signal | — | W49 | — | 0.5 | KV12-C-4 | — | — | — |
| D | Vehicle speed | — | W56 | — | 0.5 | KV12-C-27 | — | — | — |
| E | Coolant temperature (ECT) | — | W51 | — | 0.5 | KV12-C-6 | — | — | — |
| F | Knock sensor | — | W22 | — | 0.5 | KV12-D-11 | — | — | — |
| H | Cam position (CMP) | — | W20 | — | 0.5 | KV12-D-6 | — | — | — |
| I | +5V sensor supply | — | W17 | — | 0.5 | KV12-D-21 | — | — | — |
| J | Crank position (CKP) | — | W18 | — | 0.5 | KV12-D-4 | — | — | — |
| K | Tachometer output | — | — | — | — | — | — | — | — |
| L | Mass air flow (MAF) | — | W47 | — | 0.5 | KV12-C-2 | — | — | — |
| M | EGR valve | — | W39 | — | 0.5 | KV12-B-13 | — | — | — |
| N | EGR valve | — | W40 | — | 0.5 | KV12-B-5 | — | — | — |
| O | EGR valve | — | W41 | — | 0.5 | KV12-B-6 | — | — | — |
| P | EGR valve | — | W42 | — | 0.5 | KV12-B-7 | — | — | — |
OEM-3
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Power ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| B | Power ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| C | Power ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| E | Throttle position (TPS) | — | W48 | — | 0.5 | KV12-C-3 | — | — | — |
| F | Signal ground | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| G | Ignition 1 (coils 1+4, wasted spark) | — | W23 | — | 0.5 | KV12-B-26 | — | — | — |
| H | Ignition 2 (coils 2+3, wasted spark) | — | W24 | — | 0.5 | KV12-B-27 | — | — | — |
| I | Clutch switch | — | W61 | — | 0.5 | KV12-C-32 | — | — | — |
| J | Rear O2 signal | — | W50 | — | 0.5 | KV12-C-5 | — | — | — |
| K | Fuel level | — | W54 | — | 0.5 | KV12-C-9 | — | — | — |
| L | Evap purge solenoid | — | W43 | — | 0.5 | KV12-B-8 | — | — | — |
| M | ISC valve +14V feed | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| N | Fuel pump relay | — | W32 | — | 0.5 | KV12-B-16 | — | — | — |
| O | ISC valve low side | — | W35 | — | 0.5 | KV12-B-17 | — | — | — |
| Q | VICS solenoid (intake butterflies) | — | W44 | — | 0.5 | KV12-A-1 | — | — | — |
| S | EGR boost sensor | — | W55 | — | 0.5 | KV12-C-10 | — | — | — |
| T | EGR boost solenoid | — | W45 | — | 0.5 | KV12-A-2 | — | — | — |
| U | Canister drain cut valve (CDCV) | — | W46 | — | 0.5 | KV12-A-3 | — | — | — |
| V | Rear O2 heater | — | W34 | — | 0.5 | KV12-A-11 | — | — | — |
| W | Injector 1 | — | W25 | — | 0.5 | KV12-B-1 | — | — | — |
| X | Injector 2 | — | W26 | — | 0.5 | KV12-B-2 | — | — | — |
| Y | Injector 3 | — | W27 | — | 0.5 | KV12-B-3 | — | — | — |
| Z | Injector 4 | — | W28 | — | 0.5 | KV12-B-4 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W14 | — | 0.5 | OEM-3-F | — | — | — |
| 1 | — | — | W15 | — | 0.5 | KV12-C-17 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | KV12-C-25 | — | — | — |
| 1 | — | — | W19 | — | 0.5 | KV12-D-5 | — | — | — |
| 1 | — | — | W21 | — | 0.5 | KV12-D-7 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-1-B | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-3-M | — | — | — |
| 1 | — | — | W3 | — | 0.85 | KV12-D-1 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | KV12-D-2 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | KV12-D-20 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W6 | — | 0.85 | OEM-3-A | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-3-B | — | — | — |
| 1 | — | — | W8 | — | 0.85 | OEM-3-C | — | — | — |
| 1 | — | — | W9 | — | 0.85 | KV12-A-19 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | KV12-B-34 | — | — | — |
| 1 | — | — | W11 | — | 0.85 | KV12-B-9 | — | — | — |
| 1 | — | — | W12 | — | 0.85 | KV12-C-1 | — | — | — |
| 1 | — | — | W13 | — | 0.85 | KV12-C-26 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-1-A | Constant +12V | power_in | — | — | — | single_source | |
| OEM-1-B | ECU power +14V (main relay) | power_in | KV12-D-1 + KV12-D-2 + KV12-D-20 | ECU 14V Supply + Auxiliary Output 13-16 14V Supply + Auxiliary Output 9-12 14V Supply | power_in | single_source | |
| OEM-1-E | Malfunction indicator lamp (MIL) | low_side_out | KV12-B-10 | Auxiliary Output 1 | low_side_out | single_source | |
| OEM-1-F | Brake switch | digital_in | KV12-C-28 | Digital Input 2 | digital_in | single_source | |
| OEM-1-G | Power steering pressure switch | digital_in | KV12-C-29 | Digital Input 3 | digital_in | single_source | |
| OEM-1-I | Condenser fan relay | low_side_out | KV12-D-9 | EFI Relay Output (Low Side 200mA) | low_side_out | single_source | |
| OEM-1-O | Alternator control | low_side_out | KV12-B-11 | Auxiliary Output 2 | low_side_out | single_source | |
| OEM-1-P | A/C request | digital_in | KV12-C-30 | Digital Input 4 | digital_in | single_source | |
| OEM-1-Q | Charge lamp | low_side_out | KV12-B-12 | Auxiliary Output 3 | low_side_out | single_source | |
| OEM-1-R | Cooling fan relay | low_side_out | KV12-B-14 | Auxiliary Output 5 | low_side_out | single_source | |
| OEM-1-S | A/C clutch relay | low_side_out | KV12-B-15 | Auxiliary Output 6 | low_side_out | single_source | |
| OEM-1-U | Front O2 heater | low_side_out | KV12-A-10 | Lambda 1 Heater - | low_side_out | single_source | |
| OEM-1-V | Neutral switch | digital_in | KV12-C-31 | Digital Input 5 | digital_in | single_source | |
| OEM-2-A | Fuel tank pressure | analog_in | KV12-C-8 | Analog Input Channel 7 | analog_in | single_source | |
| OEM-2-B | Intake air temperature (IAT) | temp_in | KV12-C-7 | Analog Input Channel 6 | analog_in | single_source | |
| OEM-2-C | Front O2 signal | lambda_nb_in | KV12-C-4 | Analog Input Channel 3 | analog_in | single_source | |
| OEM-2-D | Vehicle speed | digital_in | KV12-C-27 | Digital Input 1 | digital_in | single_source | |
| OEM-2-E | Coolant temperature (ECT) | temp_in | KV12-C-6 | Analog Input Channel 5 | analog_in | single_source | |
| OEM-2-F | Knock sensor | knock_in | KV12-D-11 | Knock 1 + | knock_in | single_source | |
| OEM-2-H | Cam position (CMP) | trigger_in | KV12-D-6 | Sync Sensor + | trigger_in | single_source | |
| OEM-2-I | +5V sensor supply | vref | KV12-D-21 | Sensor Supply Vref1: 5.0V | vref | single_source | |
| OEM-2-J | Crank position (CKP) | trigger_in | KV12-D-4 | Crank Index Sensor + | trigger_in | single_source | |
| OEM-2-K | Tachometer output | tacho_out | — | — | — | single_source | |
| OEM-2-L | Mass air flow (MAF) | analog_in | KV12-C-2 | Analog Input Channel 1 | analog_in | single_source | |
| OEM-2-M | EGR valve | low_side_out | KV12-B-13 | Auxiliary Output 4 | low_side_out | single_source | |
| OEM-2-N | EGR valve | low_side_out | KV12-B-5 | Injection Channel 5 | injector_out | single_source | |
| OEM-2-O | EGR valve | low_side_out | KV12-B-6 | Injection Channel 6 | injector_out | single_source | |
| OEM-2-P | EGR valve | low_side_out | KV12-B-7 | Injection Channel 7 | injector_out | single_source | |
| OEM-3-A | Power ground | ground | KV12-A-19 + KV12-B-34 + KV12-B-9 + KV12-C-1 + KV12-C-26 | ECU Ground + ECU Ground + ECU Ground + ECU Ground + ECU Ground | ground | single_source | |
| OEM-3-B | Power ground | ground | KV12-A-19 + KV12-B-34 + KV12-B-9 + KV12-C-1 + KV12-C-26 | ECU Ground + ECU Ground + ECU Ground + ECU Ground + ECU Ground | ground | single_source | |
| OEM-3-C | Power ground | ground | KV12-A-19 + KV12-B-34 + KV12-B-9 + KV12-C-1 + KV12-C-26 | ECU Ground + ECU Ground + ECU Ground + ECU Ground + ECU Ground | ground | single_source | |
| OEM-3-E | Throttle position (TPS) | analog_in | KV12-C-3 | Analog Input Channel 2 | analog_in | single_source | |
| OEM-3-F | Signal ground | sensor_ground | KV12-C-17 + KV12-C-25 + KV12-D-5 + KV12-D-7 | Analog Sensor 0V Reference + Analog Sensor 0V Reference + Crank Index Sensor - + Sync Sensor - | sensor_ground + trigger_in | single_source | |
| OEM-3-G | Ignition 1 (coils 1+4, wasted spark) | ignition_out | KV12-B-26 | Ignition Channel 1 | ignition_out | single_source | |
| OEM-3-H | Ignition 2 (coils 2+3, wasted spark) | ignition_out | KV12-B-27 | Ignition Channel 2 | ignition_out | single_source | |
| OEM-3-I | Clutch switch | digital_in | KV12-C-32 | Digital Input 6 | digital_in | single_source | |
| OEM-3-J | Rear O2 signal | lambda_nb_in | KV12-C-5 | Analog Input Channel 4 | analog_in | single_source | |
| OEM-3-K | Fuel level | analog_in | KV12-C-9 | Analog Input Channel 8 | analog_in | single_source | |
| OEM-3-L | Evap purge solenoid | low_side_out | KV12-B-8 | Injection Channel 8 | injector_out | single_source | |
| OEM-3-M | ISC valve +14V feed | power_in | KV12-D-1 + KV12-D-2 + KV12-D-20 | ECU 14V Supply + Auxiliary Output 13-16 14V Supply + Auxiliary Output 9-12 14V Supply | power_in | single_source | |
| OEM-3-N | Fuel pump relay | low_side_out | KV12-B-16 | Auxiliary Output 7 | low_side_out | single_source | |
| OEM-3-O | ISC valve low side | low_side_out | KV12-B-17 | Auxiliary Output 8 | low_side_out | single_source | |
| OEM-3-Q | VICS solenoid (intake butterflies) | low_side_out | KV12-A-1 | Injection Channel 9 | injector_out | single_source | |
| OEM-3-S | EGR boost sensor | analog_in | KV12-C-10 | Analog Input Channel 9 | analog_in | single_source | |
| OEM-3-T | EGR boost solenoid | low_side_out | KV12-A-2 | Injection Channel 10 | injector_out | single_source | |
| OEM-3-U | Canister drain cut valve (CDCV) | low_side_out | KV12-A-3 | Injection Channel 11 | injector_out | single_source | |
| OEM-3-V | Rear O2 heater | low_side_out | KV12-A-11 | Lambda 2 Heater - | low_side_out | single_source | |
| OEM-3-W | Injector 1 | injector_out | KV12-B-1 | Injection Channel 1 | injector_out | single_source | |
| OEM-3-X | Injector 2 | injector_out | KV12-B-2 | Injection Channel 2 | injector_out | single_source | |
| OEM-3-Y | Injector 3 | injector_out | KV12-B-3 | Injection Channel 3 | injector_out | single_source | |
| OEM-3-Z | Injector 4 | injector_out | KV12-B-4 | Injection Channel 4 | injector_out | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-1-B | SP-14V-1 | 0.85 | no route | ECU power +14V (main relay) | — | |
| W2 | OEM-3-M | SP-14V-1 | 0.85 | no route | ISC valve +14V feed | — | |
| W3 | SP-14V-1 | KV12-D-1 | 0.85 | no route | ECU 14V Supply | — | |
| W4 | SP-14V-1 | KV12-D-2 | 0.85 | no route | Auxiliary Output 13-16 14V Supply | — | |
| W5 | SP-14V-1 | KV12-D-20 | 0.85 | no route | Auxiliary Output 9-12 14V Supply | — | |
| W6 | OEM-3-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W7 | OEM-3-B | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W8 | OEM-3-C | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W9 | SP-GND-1 | KV12-A-19 | 0.85 | no route | ECU Ground | — | |
| W10 | SP-GND-1 | KV12-B-34 | 0.85 | no route | ECU Ground | — | |
| W11 | SP-GND-1 | KV12-B-9 | 0.85 | no route | ECU Ground | — | |
| W12 | SP-GND-1 | KV12-C-1 | 0.85 | no route | ECU Ground | — | |
| W13 | SP-GND-1 | KV12-C-26 | 0.85 | no route | ECU Ground | — | |
| W14 | OEM-3-F | SP-0V-1 | 0.5 | no route | Signal ground | — | |
| W15 | SP-0V-1 | KV12-C-17 | 0.5 | no route | Analog Sensor 0V Reference | — | |
| W16 | SP-0V-1 | KV12-C-25 | 0.5 | no route | Analog Sensor 0V Reference | — | |
| W17 | OEM-2-I | KV12-D-21 | 0.5 | no route | +5V sensor supply | — | |
| W18 | OEM-2-J | KV12-D-4 | 0.5 | no route | Crank position (CKP) | — | |
| W19 | SP-0V-1 | KV12-D-5 | 0.5 | no route | Crank Index Sensor - | — | |
| W20 | OEM-2-H | KV12-D-6 | 0.5 | no route | Cam position (CMP) | — | |
| W21 | SP-0V-1 | KV12-D-7 | 0.5 | no route | Sync Sensor - | — | |
| W22 | OEM-2-F | KV12-D-11 | 0.5 | no route | Knock sensor | — | |
| W23 | OEM-3-G | KV12-B-26 | 0.5 | no route | Ignition 1 (coils 1+4, wasted spark) | — | |
| W24 | OEM-3-H | KV12-B-27 | 0.5 | no route | Ignition 2 (coils 2+3, wasted spark) | — | |
| W25 | OEM-3-W | KV12-B-1 | 0.5 | no route | Injector 1 | — | |
| W26 | OEM-3-X | KV12-B-2 | 0.5 | no route | Injector 2 | — | |
| W27 | OEM-3-Y | KV12-B-3 | 0.5 | no route | Injector 3 | — | |
| W28 | OEM-3-Z | KV12-B-4 | 0.5 | no route | Injector 4 | — | |
| W29 | OEM-1-I | KV12-D-9 | 0.5 | no route | Condenser fan relay | — | |
| W30 | OEM-1-R | KV12-B-14 | 0.5 | no route | Cooling fan relay | — | |
| W31 | OEM-1-S | KV12-B-15 | 0.5 | no route | A/C clutch relay | — | |
| W32 | OEM-3-N | KV12-B-16 | 0.5 | no route | Fuel pump relay | — | |
| W33 | OEM-1-U | KV12-A-10 | 0.5 | no route | Front O2 heater | — | |
| W34 | OEM-3-V | KV12-A-11 | 0.5 | no route | Rear O2 heater | — | |
| W35 | OEM-3-O | KV12-B-17 | 0.5 | no route | ISC valve low side | — | |
| W36 | OEM-1-E | KV12-B-10 | 0.5 | no route | Malfunction indicator lamp (MIL) | — | |
| W37 | OEM-1-O | KV12-B-11 | 0.5 | no route | Alternator control | — | |
| W38 | OEM-1-Q | KV12-B-12 | 0.5 | no route | Charge lamp | — | |
| W39 | OEM-2-M | KV12-B-13 | 0.5 | no route | EGR valve | — | |
| W40 | OEM-2-N | KV12-B-5 | 0.5 | no route | EGR valve | — | |
| W41 | OEM-2-O | KV12-B-6 | 0.5 | no route | EGR valve | — | |
| W42 | OEM-2-P | KV12-B-7 | 0.5 | no route | EGR valve | — | |
| W43 | OEM-3-L | KV12-B-8 | 0.5 | no route | Evap purge solenoid | — | |
| W44 | OEM-3-Q | KV12-A-1 | 0.5 | no route | VICS solenoid (intake butterflies) | — | |
| W45 | OEM-3-T | KV12-A-2 | 0.5 | no route | EGR boost solenoid | — | |
| W46 | OEM-3-U | KV12-A-3 | 0.5 | no route | Canister drain cut valve (CDCV) | — | |
| W47 | OEM-2-L | KV12-C-2 | 0.5 | no route | Mass air flow (MAF) | — | |
| W48 | OEM-3-E | KV12-C-3 | 0.5 | no route | Throttle position (TPS) | — | |
| W49 | OEM-2-C | KV12-C-4 | 0.5 | no route | Front O2 signal | — | |
| W50 | OEM-3-J | KV12-C-5 | 0.5 | no route | Rear O2 signal | — | |
| W51 | OEM-2-E | KV12-C-6 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W52 | OEM-2-B | KV12-C-7 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W53 | OEM-2-A | KV12-C-8 | 0.5 | no route | Fuel tank pressure | — | |
| W54 | OEM-3-K | KV12-C-9 | 0.5 | no route | Fuel level | — | |
| W55 | OEM-3-S | KV12-C-10 | 0.5 | no route | EGR boost sensor | — | |
| W56 | OEM-2-D | KV12-C-27 | 0.5 | no route | Vehicle speed | — | |
| W57 | OEM-1-F | KV12-C-28 | 0.5 | no route | Brake switch | — | |
| W58 | OEM-1-G | KV12-C-29 | 0.5 | no route | Power steering pressure switch | — | |
| W59 | OEM-1-P | KV12-C-30 | 0.5 | no route | A/C request | — | |
| W60 | OEM-1-V | KV12-C-31 | 0.5 | no route | Neutral switch | — | |
| W61 | OEM-3-I | KV12-C-32 | 0.5 | no route | Clutch switch | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| connector | 3-1437290-7 | TE | Superseal 1.0 26-way plug | 1.000 | ea |
| connector | 3-1437290-8 | TE | Superseal 1.0 26-way plug, Key 2 | 1.000 | ea |
| 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 |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (12)
| Severity | Code | Subject | Message |
|---|---|---|---|
| warn | DATASET_GAP | KV12 A | 5 of 26 cavities on KV12 A have no pin data (5,6,7,12,13). Anything there is invisible to these checks. |
| info | NET_FAMILY | OEM-2-B ↔ KV12-C-7 | OEM-2-B "Intake air temperature (IAT)" [temp_in] is wired to KV12-C-7 "Analog Input Channel 6" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-2-E ↔ KV12-C-6 | OEM-2-E "Coolant temperature (ECT)" [temp_in] is wired to KV12-C-6 "Analog Input Channel 5" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-2-N ↔ KV12-B-5 | OEM-2-N "EGR valve" [low_side_out] is wired to KV12-B-5 "Injection Channel 5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-2-O ↔ KV12-B-6 | OEM-2-O "EGR valve" [low_side_out] is wired to KV12-B-6 "Injection Channel 6" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-2-P ↔ KV12-B-7 | OEM-2-P "EGR valve" [low_side_out] is wired to KV12-B-7 "Injection Channel 7" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-3-F ↔ KV12-D-5 | OEM-3-F "Signal ground" [sensor_ground] is wired to KV12-D-5 "Crank Index Sensor -" [trigger_in]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs. |
| info | NET_FAMILY | OEM-3-L ↔ KV12-B-8 | OEM-3-L "Evap purge solenoid" [low_side_out] is wired to KV12-B-8 "Injection Channel 8" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-3-Q ↔ KV12-A-1 | OEM-3-Q "VICS solenoid (intake butterflies)" [low_side_out] is wired to KV12-A-1 "Injection Channel 9" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-3-T ↔ KV12-A-2 | OEM-3-T "EGR boost solenoid" [low_side_out] is wired to KV12-A-2 "Injection Channel 10" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-3-U ↔ KV12-A-3 | OEM-3-U "Canister drain cut valve (CDCV)" [low_side_out] is wired to KV12-A-3 "Injection Channel 11" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | UNMAPPED | OEM | 1 optional OEM pins are not mapped: OEM-2-K Tachometer output |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-1-A | Battery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed. | mapping-proposal |
Notes
Auto-mapped by auto_map() from the library pin data on 2026-10-04. Review every wire against both manuals before building. Not wired: - OEM-1 A: Constant +12V: Emtron KV12 has no battery-constant input; not needed - KV12-D 12: Knock 1 - left open: the stock knock sensor has one ECU wire; check the ECU manual for single-wire knock sensors - OEM-2 K: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on Emtron KV12 - KV12-D 15: Ignition Switch Input: not fed (the stock ECU has no ignition-sense pin); feed it from a switched-ignition source
Sources
| Reliability | Kind | Title | URL |
|---|---|---|---|
| 4 | vendor_doc | Emtron KV12/KV16 Pinout Rev2 | https://github.com/emtron-australia/help |
| 4 | vendor_doc | Link G4X MX5NB1X install manual (NB1 1999-00) | https://linkecu.com/documentation/MX5XNB1.pdf |