MX-5 Miata NB2 2001-05 (BP-Z3, VVT; excludes Mazdaspeed) → Emtron KV8 (auto)
MX-5 Miata NB2 2001-05 (BP-Z3, VVT; excludes Mazdaspeed) — Emtron — KV8
Drawn by Michael Gnankou · Rev 0 · proposal · 2026-10-09
Before you start
Not confident with automotive wiring? Have a professional harness builder or tuner do it, or check your work before first power-up. A wiring mistake can damage the ECU, the engine or the car, or start a fire.
Install modifications
Steps on the car itself, outside the harness. Every harness for this car inherits them.
- Re-route the pressure-sensor vacuum hose to the intake manifoldrequired
Re-route the pressure sensor's (Mazda "EGR boost sensor", pin 4AE) vacuum hose directly to the intake manifold, bypassing the EGR boost solenoid. The stock ECU multiplexes baro + MAP through that solenoid: with it off the sensor reads atmosphere, with it energized it reads manifold. After re-routing the sensor reads MAP only, so the standalone needs its own barometric source — its onboard baro sensor if fitted, or a separate baro sensor on a spare analog input. (Alternative, not recommended: keep the hose stock and have the ECU energize the solenoid permanently via a low-side output switched with ignition; this costs an output.)
Why: With the solenoid off (its default) the sensor reads atmospheric pressure, not manifold pressure, so a standalone that uses this sensor as its MAP input would read the wrong value.
Where: EGR boost solenoid and the pressure sensor's vacuum hose (sensor signal 4AE).
Source: Justin Barrera — Miata NA/NB wiring corrections
| Status | proposal · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | none |
| Size of the job | 61 wires · 10 connectors · 5 part lines |
| Tools | Crimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink |
| Terminals | 3-1447221-4 |
| Order of work | 1. Check every part against the parts list. 2. Cut and label every wire (labels: Export → Wire labels). 3. Crimp and pin connector by connector, ticking the build checklist. 4. Run the bench test with nothing plugged in and the battery disconnected. 5. Only then connect the ECU and power up. |
Build checklist
Tick each box as you go. Continuity: meter from end to end, expect under 1 Ω.
| Wire | From | To | Gauge | Colour | Cut | Label | Crimp A | Crimp B | Pin A | Pin B | Continuity |
|---|---|---|---|---|---|---|---|---|---|---|---|
| W1 | OEM-2-P | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-4-AF | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | KV8-D-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | SP-14V-1 | KV8-D-2 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | SP-14V-1 | KV8-D-20 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-3-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-3-B | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-4-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | KV8-B-34 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | KV8-B-9 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-GND-1 | KV8-C-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-GND-1 | KV8-C-26 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-4-O | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | SP-0V-1 | KV8-C-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-0V-1 | KV8-C-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-4-L | KV8-D-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-3-Y | KV8-D-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | SP-0V-1 | KV8-D-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-3-V | KV8-D-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | SP-0V-1 | KV8-D-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-4-M | KV8-D-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-3-F | KV8-B-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-3-I | KV8-B-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-2-A | KV8-B-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-2-D | KV8-B-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-2-G | KV8-B-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-2-J | KV8-B-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-2-B | KV8-D-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-2-C | KV8-B-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-2-K | KV8-B-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-2-M | KV8-B-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-3-H | KV8-B-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-3-J | KV8-A-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-3-P | KV8-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-2-Q | KV8-B-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-2-E | KV8-B-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-2-F | KV8-B-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-2-H | KV8-B-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-2-I | KV8-B-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-2-N | KV8-B-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-2-R | KV8-B-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-3-E | KV8-B-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-3-M | KV8-B-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-3-U | KV8-B-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-4-D | KV8-B-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-4-X | KV8-C-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-4-AE | KV8-C-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-4-V | KV8-C-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-4-AA | KV8-C-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | OEM-4-W | KV8-C-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W51 | OEM-4-P | KV8-C-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W52 | OEM-4-N | KV8-C-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W53 | OEM-4-AD | KV8-C-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W54 | OEM-3-T | KV8-C-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W55 | OEM-3-S | KV8-C-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W56 | OEM-4-B | KV8-C-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W57 | OEM-4-C | KV8-C-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W58 | OEM-4-F | KV8-C-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W59 | OEM-4-H | KV8-C-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W60 | OEM-4-I | KV8-C-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W61 | OEM-4-J | KV8-C-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ |
Bench test (before first power-up)
Pre-power install steps (make these cuts/modifications on the car first, then verify the checks below): Re-route the pressure-sensor vacuum hose to the intake manifold.
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 | KV8-D-1 | KV8-B-34 | open (OL) | +12 V supply must not touch power ground | |
| 2 | KV8-D-1 | KV8-C-17 | open (OL) | +12 V supply must not touch sensor ground | |
| 3 | KV8-D-21 | KV8-C-17 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 4 | KV8-B-34 | KV8-D-21 | open (OL) | power ground must not touch 5 V sensor reference | |
| 5 | KV8-D-1 | KV8-D-21 | open (OL) | +12 V supply must not touch 5 V sensor reference |
If any reading doesn't match, stop and get help before powering up.
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
KV8-A
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | — | — | — | — | — | — | — |
| 2 | — | — | — | — | — | — | — | — | — |
| 3 | — | — | — | — | — | — | — | — | — |
| 4 | — | — | — | — | — | — | — | — | — |
| 5 | — | — | — | — | — | — | — | — | — |
| 6 | — | — | — | — | — | — | — | — | — |
| 7 | — | — | — | — | — | — | — | — | — |
| 8 | — | — | — | — | — | — | — | — | — |
| 9 | — | — | — | — | — | — | — | — | — |
| 10 | Lambda 1 heater − | — | W33 | — | 0.5 | OEM-3-J | — | — | — |
| 11 | Lambda 2 heater − | — | W34 | — | 0.5 | OEM-3-P | — | — | — |
| 12 | — | — | — | — | — | — | — | — | — |
| 13 | — | — | — | — | — | — | — | — | — |
| 14 | — | — | — | — | — | — | — | — | — |
| 15 | — | — | — | — | — | — | — | — | — |
| 16 | Lambda 1 heater + | — | — | — | — | — | — | — | — |
| 17 | Lambda 2 heater + | — | — | — | — | — | — | — | — |
| 18 | Lambda 1 Nernst cell (Vs) | — | — | — | — | — | — | — | — |
| 19 | — | — | — | — | — | — | — | — | — |
| 20 | Lambda 2 cal resistor | — | — | — | — | — | — | — | — |
| 21 | Lambda 2 Nernst cell (Vs) | — | — | — | — | — | — | — | — |
| 22 | Lambda 2 pump cell (Ip) | — | — | — | — | — | — | — | — |
| 23 | Lambda 2 virtual ground | — | — | — | — | — | — | — | — |
| 24 | Lambda 1 cal resistor | — | — | — | — | — | — | — | — |
| 25 | Lambda 1 pump cell (Ip) | — | — | — | — | — | — | — | — |
| 26 | Lambda 1 virtual ground | — | — | — | — | — | — | — | — |
KV8-B
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injection 1 | — | W24 | — | 0.5 | OEM-2-A | — | — | — |
| 2 | Injection 2 | — | W25 | — | 0.5 | OEM-2-D | — | — | — |
| 3 | Injection 3 | — | W26 | — | 0.5 | OEM-2-G | — | — | — |
| 4 | Injection 4 | — | W27 | — | 0.5 | OEM-2-J | — | — | — |
| 5 | Injection 5 | — | W39 | — | 0.5 | OEM-2-I | — | — | — |
| 6 | Injection 6 | — | W40 | — | 0.5 | OEM-2-N | — | — | — |
| 7 | Injection 7 | — | W41 | — | 0.5 | OEM-2-R | — | — | — |
| 8 | Injection 8 | — | W42 | — | 0.5 | OEM-3-E | — | — | — |
| 9 | ECU ground | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| 10 | Aux 1 | — | W35 | — | 0.5 | OEM-2-Q | — | — | — |
| 11 | Aux 2 | — | W36 | — | 0.5 | OEM-2-E | — | — | — |
| 12 | Aux 3 | — | W37 | — | 0.5 | OEM-2-F | — | — | — |
| 13 | Aux 4 | — | W38 | — | 0.5 | OEM-2-H | — | — | — |
| 14 | Aux 5 | — | W29 | — | 0.5 | OEM-2-C | — | — | — |
| 15 | Aux 6 | — | W30 | — | 0.5 | OEM-2-K | — | — | — |
| 16 | Aux 7 | — | W31 | — | 0.5 | OEM-2-M | — | — | — |
| 17 | Aux 8 | — | W32 | — | 0.5 | OEM-3-H | — | — | — |
| 18 | Aux 9 | — | W43 | — | 0.5 | OEM-3-M | — | — | — |
| 19 | Aux 10 | — | W44 | — | 0.5 | OEM-3-U | — | — | — |
| 20 | Aux 11 | — | W45 | — | 0.5 | OEM-4-D | — | — | — |
| 21 | Aux 12 | — | — | — | — | — | — | — | — |
| 22 | Aux 13 | — | — | — | — | — | — | — | — |
| 23 | Aux 14 | — | — | — | — | — | — | — | — |
| 24 | Aux 15 | — | — | — | — | — | — | — | — |
| 25 | Aux 16 | — | — | — | — | — | — | — | — |
| 26 | Ignition 1 | — | W22 | — | 0.5 | OEM-3-F | — | — | — |
| 27 | Ignition 2 | — | W23 | — | 0.5 | OEM-3-I | — | — | — |
| 28 | Ignition 3 | — | — | — | — | — | — | — | — |
| 29 | Ignition 4 | — | — | — | — | — | — | — | — |
| 30 | Ignition 5 | — | — | — | — | — | — | — | — |
| 31 | Ignition 6 | — | — | — | — | — | — | — | — |
| 32 | Ignition 7 | — | — | — | — | — | — | — | — |
| 33 | Ignition 8 | — | — | — | — | — | — | — | — |
| 34 | ECU ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
KV8-C
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | ECU ground | — | W11 | — | 0.85 | SP-GND-1 | — | — | — |
| 2 | Analog in 1 | — | W46 | — | 0.5 | OEM-4-X | — | — | — |
| 3 | Analog in 2 | — | W47 | — | 0.5 | OEM-4-AE | — | — | — |
| 4 | Analog in 3 | — | W48 | — | 0.5 | OEM-4-V | — | — | — |
| 5 | Analog in 4 | — | W49 | — | 0.5 | OEM-4-AA | — | — | — |
| 6 | Analog in 5 | — | W50 | — | 0.5 | OEM-4-W | — | — | — |
| 7 | Analog in 6 | — | W51 | — | 0.5 | OEM-4-P | — | — | — |
| 8 | Analog in 7 | — | W52 | — | 0.5 | OEM-4-N | — | — | — |
| 9 | Analog in 8 | — | W53 | — | 0.5 | OEM-4-AD | — | — | — |
| 10 | Analog in 9 | — | — | — | — | — | — | — | — |
| 11 | Analog in 10 | — | — | — | — | — | — | — | — |
| 12 | Analog in 11 | — | — | — | — | — | — | — | — |
| 13 | Analog in 12 | — | — | — | — | — | — | — | — |
| 14 | Analog in 13 | — | — | — | — | — | — | — | — |
| 15 | Analog in 14 | — | — | — | — | — | — | — | — |
| 16 | Analog in 15 | — | — | — | — | — | — | — | — |
| 17 | Analog sensor 0V reference | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 18 | Digital in 9 | — | — | — | — | — | — | — | — |
| 19 | Digital in 10 | — | — | — | — | — | — | — | — |
| 20 | Digital in 11 | — | — | — | — | — | — | — | — |
| 21 | Digital in 12 | — | — | — | — | — | — | — | — |
| 22 | Digital in 13 | — | — | — | — | — | — | — | — |
| 23 | Digital in 14 | — | — | — | — | — | — | — | — |
| 24 | Analog in 16 | — | — | — | — | — | — | — | — |
| 25 | Analog sensor 0V reference | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 26 | ECU ground | — | W12 | — | 0.85 | SP-GND-1 | — | — | — |
| 27 | Digital in 1 | — | W54 | — | 0.5 | OEM-3-T | — | — | — |
| 28 | Digital in 2 | — | W55 | — | 0.5 | OEM-3-S | — | — | — |
| 29 | Digital in 3 | — | W56 | — | 0.5 | OEM-4-B | — | — | — |
| 30 | Digital in 4 | — | W57 | — | 0.5 | OEM-4-C | — | — | — |
| 31 | Digital in 5 | — | W58 | — | 0.5 | OEM-4-F | — | — | — |
| 32 | Digital in 6 | — | W59 | — | 0.5 | OEM-4-H | — | — | — |
| 33 | Digital in 7 | — | W60 | — | 0.5 | OEM-4-I | — | — | — |
| 34 | Digital in 8 | — | W61 | — | 0.5 | OEM-4-J | — | — | — |
KV8-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 | Aux 13–16 14V supply | — | W4 | — | 0.85 | SP-14V-1 | — | — | — |
| 3 | Sensor supply 8V | — | — | — | — | — | — | — | — |
| 4 | Crank index sensor + | — | W17 | — | 0.5 | OEM-3-Y | — | — | — |
| 5 | Crank index sensor − | — | W18 | — | 0.5 | SP-0V-1 | — | — | — |
| 6 | Sync sensor + | — | W19 | — | 0.5 | OEM-3-V | — | — | — |
| 7 | Sync sensor − | — | W20 | — | 0.5 | SP-0V-1 | — | — | — |
| 8 | CAN 1 H | — | — | — | — | — | — | — | — |
| 9 | EFI relay output (low side, 200 mA) | — | W28 | — | 0.5 | OEM-2-B | — | — | — |
| 10 | CAN 2 H | — | — | — | — | — | — | — | — |
| 11 | Knock 1 + | — | W21 | — | 0.5 | OEM-4-M | — | — | — |
| 12 | Knock 1 − | — | — | — | — | — | — | — | — |
| 13 | Shield (crank/cam/knock) | — | — | — | — | — | — | — | — |
| 14 | CAN 1 L | — | — | — | — | — | — | — | — |
| 15 | Ignition switch input | — | — | — | — | — | — | — | — |
| 16 | CAN 2 L | — | — | — | — | — | — | — | — |
| 17 | Knock 2 + | — | — | — | — | — | — | — | — |
| 18 | Knock 2 − | — | — | — | — | — | — | — | — |
| 19 | Analog output 0–5V | — | — | — | — | — | — | — | — |
| 20 | Aux 9–12 14V supply | — | W5 | — | 0.85 | SP-14V-1 | — | — | — |
| 21 | Sensor supply Vref1 5.0V | — | W16 | — | 0.5 | OEM-4-L | — | — | — |
| 22 | Sensor supply Vref2 5.0V | — | — | — | — | — | — | — | — |
| 23 | Ethernet Tx+ | — | — | — | — | — | — | — | — |
| 24 | Ethernet Tx− | — | — | — | — | — | — | — | — |
| 25 | Ethernet Rx+ | — | — | — | — | — | — | — | — |
| 26 | Ethernet Rx− | — | — | — | — | — | — | — | — |
OEM-2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Injector 1 | — | W24 | — | 0.5 | KV8-B-1 | — | — | — |
| B | Cooling fan relay | — | W28 | — | 0.5 | KV8-D-9 | — | — | — |
| C | Condenser fan relay | — | W29 | — | 0.5 | KV8-B-14 | — | — | — |
| D | Injector 2 | — | W25 | — | 0.5 | KV8-B-2 | — | — | — |
| E | EGR valve | — | W36 | — | 0.5 | KV8-B-11 | — | — | — |
| F | EGR valve | — | W37 | — | 0.5 | KV8-B-12 | — | — | — |
| G | Injector 3 | — | W26 | — | 0.5 | KV8-B-3 | — | — | — |
| H | EGR valve | — | W38 | — | 0.5 | KV8-B-13 | — | — | — |
| I | EGR valve | — | W39 | — | 0.5 | KV8-B-5 | — | — | — |
| J | Injector 4 | — | W27 | — | 0.5 | KV8-B-4 | — | — | — |
| K | A/C clutch relay | — | W30 | — | 0.5 | KV8-B-15 | — | — | — |
| M | Fuel pump relay | — | W31 | — | 0.5 | KV8-B-16 | — | — | — |
| N | VTCS solenoid (intake butterflies) | — | W40 | — | 0.5 | KV8-B-6 | — | — | — |
| P | ISC valve +14V feed | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| Q | ISC valve low side | — | W35 | — | 0.5 | KV8-B-10 | — | — | — |
| R | Malfunction indicator lamp (MIL) | — | W41 | — | 0.5 | KV8-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 | — | — | — |
| D | EGR boost solenoid | — | — | — | — | — | — | — | — |
| E | Charcoal canister purge | — | W42 | — | 0.5 | KV8-B-8 | — | — | — |
| F | Ignition 1 (coils 1+4, wasted spark) | — | W22 | — | 0.5 | KV8-B-26 | — | — | — |
| H | Main relay | — | W32 | — | 0.5 | KV8-B-17 | — | — | — |
| I | Ignition 2 (coils 2+3, wasted spark) | — | W23 | — | 0.5 | KV8-B-27 | — | — | — |
| J | Front O2 heater | — | W33 | — | 0.5 | KV8-A-10 | — | — | — |
| M | Alternator control | — | W43 | — | 0.5 | KV8-B-18 | — | — | — |
| O | Tachometer output | — | — | — | — | — | — | — | — |
| P | Rear O2 heater | — | W34 | — | 0.5 | KV8-A-11 | — | — | — |
| S | Immobiliser | — | W55 | — | 0.5 | KV8-C-28 | — | — | — |
| T | Vehicle speed | — | W54 | — | 0.5 | KV8-C-27 | — | — | — |
| U | Charge lamp | — | W44 | — | 0.5 | KV8-B-19 | — | — | — |
| V | Cam position (CMP) | — | W19 | — | 0.5 | KV8-D-6 | — | — | — |
| Y | Crank position (CKP) | — | W17 | — | 0.5 | KV8-D-4 | — | — | — |
OEM-4
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Power ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| AA | Rear O2 signal | — | W49 | — | 0.5 | KV8-C-5 | — | — | — |
| AD | Fuel level | — | W53 | — | 0.5 | KV8-C-9 | — | — | — |
| AE | Pressure sensor (Mazda: EGR boost sensor) | — | W47 | — | 0.5 | KV8-C-3 | — | — | — |
| AF | ECU power +14V (main relay) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| AG | Constant +12V | — | — | — | — | — | — | — | — |
| B | Brake switch | — | W56 | — | 0.5 | KV8-C-29 | — | — | — |
| C | Power steering pressure switch | — | W57 | — | 0.5 | KV8-C-30 | — | — | — |
| D | VVT oil-control solenoid | — | W45 | — | 0.5 | KV8-B-20 | — | — | — |
| F | A/C request | — | W58 | — | 0.5 | KV8-C-31 | — | — | — |
| H | Neutral switch | — | W59 | — | 0.5 | KV8-C-32 | — | — | — |
| I | Clutch switch | — | W60 | — | 0.5 | KV8-C-33 | — | — | — |
| J | VTCS vacuum switch | — | W61 | — | 0.5 | KV8-C-34 | — | — | — |
| L | +5V sensor supply | — | W16 | — | 0.5 | KV8-D-21 | — | — | — |
| M | Knock sensor | — | W21 | — | 0.5 | KV8-D-11 | — | — | — |
| N | Intake air temperature (IAT) | — | W52 | — | 0.5 | KV8-C-8 | — | — | — |
| O | Signal ground | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| P | Coolant temperature (ECT) | — | W51 | — | 0.5 | KV8-C-7 | — | — | — |
| V | Throttle position (TPS) | — | W48 | — | 0.5 | KV8-C-4 | — | — | — |
| W | Front O2 signal | — | W50 | — | 0.5 | KV8-C-6 | — | — | — |
| X | Mass air flow (MAF) | — | W46 | — | 0.5 | KV8-C-2 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W13 | — | 0.5 | OEM-4-O | — | — | — |
| 1 | — | — | W14 | — | 0.5 | KV8-C-17 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | KV8-C-25 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | KV8-D-5 | — | — | — |
| 1 | — | — | W20 | — | 0.5 | KV8-D-7 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-2-P | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-4-AF | — | — | — |
| 1 | — | — | W3 | — | 0.85 | KV8-D-1 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | KV8-D-2 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | KV8-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-4-A | — | — | — |
| 1 | — | — | W9 | — | 0.85 | KV8-B-34 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | KV8-B-9 | — | — | — |
| 1 | — | — | W11 | — | 0.85 | KV8-C-1 | — | — | — |
| 1 | — | — | W12 | — | 0.85 | KV8-C-26 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-2-A | Injector 1 | injector_out | KV8-B-1 | Injection 1 | injector_out | single_source | |
| OEM-2-B | Cooling fan relay | low_side_out | KV8-D-9 | EFI relay output (low side, 200 mA) | low_side_out | single_source | |
| OEM-2-C | Condenser fan relay | low_side_out | KV8-B-14 | Aux 5 | low_side_out | single_source | |
| OEM-2-D | Injector 2 | injector_out | KV8-B-2 | Injection 2 | injector_out | single_source | |
| OEM-2-E | EGR valve | low_side_out | KV8-B-11 | Aux 2 | low_side_out | single_source | |
| OEM-2-F | EGR valve | low_side_out | KV8-B-12 | Aux 3 | low_side_out | single_source | |
| OEM-2-G | Injector 3 | injector_out | KV8-B-3 | Injection 3 | injector_out | single_source | |
| OEM-2-H | EGR valve | low_side_out | KV8-B-13 | Aux 4 | low_side_out | single_source | |
| OEM-2-I | EGR valve | low_side_out | KV8-B-5 | Injection 5 | injector_out | single_source | |
| OEM-2-J | Injector 4 | injector_out | KV8-B-4 | Injection 4 | injector_out | single_source | |
| OEM-2-K | A/C clutch relay | low_side_out | KV8-B-15 | Aux 6 | low_side_out | single_source | |
| OEM-2-M | Fuel pump relay | low_side_out | KV8-B-16 | Aux 7 | low_side_out | single_source | |
| OEM-2-N | VTCS solenoid (intake butterflies) | low_side_out | KV8-B-6 | Injection 6 | injector_out | single_source | |
| OEM-2-P | ISC valve +14V feed | power_in | KV8-D-1 + KV8-D-2 + KV8-D-20 | ECU 14V supply + Aux 13–16 14V supply + Aux 9–12 14V supply | power_in | single_source | |
| OEM-2-Q | ISC valve low side | low_side_out | KV8-B-10 | Aux 1 | low_side_out | single_source | |
| OEM-2-R | Malfunction indicator lamp (MIL) | low_side_out | KV8-B-7 | Injection 7 | injector_out | single_source | |
| OEM-3-A | Power ground | ground | KV8-B-34 + KV8-B-9 + KV8-C-1 + KV8-C-26 | ECU ground + ECU ground + ECU ground + ECU ground | ground | single_source | |
| OEM-3-B | Power ground | ground | KV8-B-34 + KV8-B-9 + KV8-C-1 + KV8-C-26 | ECU ground + ECU ground + ECU ground + ECU ground | ground | single_source | |
| OEM-3-D | EGR boost solenoid | — | — | — | — | single_source | |
| OEM-3-E | Charcoal canister purge | low_side_out | KV8-B-8 | Injection 8 | injector_out | single_source | |
| OEM-3-F | Ignition 1 (coils 1+4, wasted spark) | ignition_out | KV8-B-26 | Ignition 1 | ignition_out | single_source | |
| OEM-3-H | Main relay | low_side_out | KV8-B-17 | Aux 8 | low_side_out | single_source | |
| OEM-3-I | Ignition 2 (coils 2+3, wasted spark) | ignition_out | KV8-B-27 | Ignition 2 | ignition_out | single_source | |
| OEM-3-J | Front O2 heater | low_side_out | KV8-A-10 | Lambda 1 heater − | low_side_out | single_source | |
| OEM-3-M | Alternator control | low_side_out | KV8-B-18 | Aux 9 | hbridge_out | single_source | |
| OEM-3-O | Tachometer output | tacho_out | — | — | — | single_source | |
| OEM-3-P | Rear O2 heater | low_side_out | KV8-A-11 | Lambda 2 heater − | low_side_out | single_source | |
| OEM-3-S | Immobiliser | digital_in | KV8-C-28 | Digital in 2 | digital_in | single_source | |
| OEM-3-T | Vehicle speed | digital_in | KV8-C-27 | Digital in 1 | digital_in | single_source | |
| OEM-3-U | Charge lamp | low_side_out | KV8-B-19 | Aux 10 | hbridge_out | single_source | |
| OEM-3-V | Cam position (CMP) | trigger_in | KV8-D-6 | Sync sensor + | trigger_in | single_source | |
| OEM-3-Y | Crank position (CKP) | trigger_in | KV8-D-4 | Crank index sensor + | trigger_in | single_source | |
| OEM-4-A | Power ground | ground | KV8-B-34 + KV8-B-9 + KV8-C-1 + KV8-C-26 | ECU ground + ECU ground + ECU ground + ECU ground | ground | single_source | |
| OEM-4-AA | Rear O2 signal | lambda_nb_in | KV8-C-5 | Analog in 4 | analog_in | single_source | |
| OEM-4-AD | Fuel level | analog_in | KV8-C-9 | Analog in 8 | analog_in | single_source | |
| OEM-4-AE | Pressure sensor (Mazda: EGR boost sensor) | analog_in | KV8-C-3 | Analog in 2 | analog_in | corroborated | |
| OEM-4-AF | ECU power +14V (main relay) | power_in | KV8-D-1 + KV8-D-2 + KV8-D-20 | ECU 14V supply + Aux 13–16 14V supply + Aux 9–12 14V supply | power_in | single_source | |
| OEM-4-AG | Constant +12V | power_in | — | — | — | single_source | |
| OEM-4-B | Brake switch | digital_in | KV8-C-29 | Digital in 3 | digital_in | single_source | |
| OEM-4-C | Power steering pressure switch | digital_in | KV8-C-30 | Digital in 4 | digital_in | single_source | |
| OEM-4-D | VVT oil-control solenoid | low_side_out | KV8-B-20 | Aux 11 | hbridge_out | single_source | |
| OEM-4-F | A/C request | digital_in | KV8-C-31 | Digital in 5 | digital_in | single_source | |
| OEM-4-H | Neutral switch | digital_in | KV8-C-32 | Digital in 6 | digital_in | single_source | |
| OEM-4-I | Clutch switch | digital_in | KV8-C-33 | Digital in 7 | digital_in | single_source | |
| OEM-4-J | VTCS vacuum switch | digital_in | KV8-C-34 | Digital in 8 | digital_in | single_source | |
| OEM-4-L | +5V sensor supply | vref | KV8-D-21 | Sensor supply Vref1 5.0V | vref | single_source | |
| OEM-4-M | Knock sensor | knock_in | KV8-D-11 | Knock 1 + | knock_in | single_source | |
| OEM-4-N | Intake air temperature (IAT) | temp_in | KV8-C-8 | Analog in 7 | analog_in | single_source | |
| OEM-4-O | Signal ground | sensor_ground | KV8-C-17 + KV8-C-25 + KV8-D-5 + KV8-D-7 | Analog sensor 0V reference + Analog sensor 0V reference + Crank index sensor − + Sync sensor − | sensor_ground + trigger_in | single_source | |
| OEM-4-P | Coolant temperature (ECT) | temp_in | KV8-C-7 | Analog in 6 | analog_in | single_source | |
| OEM-4-V | Throttle position (TPS) | analog_in | KV8-C-4 | Analog in 3 | analog_in | single_source | |
| OEM-4-W | Front O2 signal | lambda_nb_in | KV8-C-6 | Analog in 5 | analog_in | single_source | |
| OEM-4-X | Mass air flow (MAF) | analog_in | KV8-C-2 | Analog in 1 | analog_in | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-2-P | SP-14V-1 | 0.85 | no route | ISC valve +14V feed | — | |
| W2 | OEM-4-AF | SP-14V-1 | 0.85 | no route | ECU power +14V (main relay) | — | |
| W3 | SP-14V-1 | KV8-D-1 | 0.85 | no route | ECU 14V supply | — | |
| W4 | SP-14V-1 | KV8-D-2 | 0.85 | no route | Aux 13–16 14V supply | — | |
| W5 | SP-14V-1 | KV8-D-20 | 0.85 | no route | Aux 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-4-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W9 | SP-GND-1 | KV8-B-34 | 0.85 | no route | ECU ground | — | |
| W10 | SP-GND-1 | KV8-B-9 | 0.85 | no route | ECU ground | — | |
| W11 | SP-GND-1 | KV8-C-1 | 0.85 | no route | ECU ground | — | |
| W12 | SP-GND-1 | KV8-C-26 | 0.85 | no route | ECU ground | — | |
| W13 | OEM-4-O | SP-0V-1 | 0.5 | no route | Signal ground | — | |
| W14 | SP-0V-1 | KV8-C-17 | 0.5 | no route | Analog sensor 0V reference | — | |
| W15 | SP-0V-1 | KV8-C-25 | 0.5 | no route | Analog sensor 0V reference | — | |
| W16 | OEM-4-L | KV8-D-21 | 0.5 | no route | +5V sensor supply | — | |
| W17 | OEM-3-Y | KV8-D-4 | 0.5 | no route | Crank position (CKP) | — | |
| W18 | SP-0V-1 | KV8-D-5 | 0.5 | no route | Crank index sensor − | — | |
| W19 | OEM-3-V | KV8-D-6 | 0.5 | no route | Cam position (CMP) | — | |
| W20 | SP-0V-1 | KV8-D-7 | 0.5 | no route | Sync sensor − | — | |
| W21 | OEM-4-M | KV8-D-11 | 0.5 | no route | Knock sensor | — | |
| W22 | OEM-3-F | KV8-B-26 | 0.5 | no route | Ignition 1 (coils 1+4, wasted spark) | — | |
| W23 | OEM-3-I | KV8-B-27 | 0.5 | no route | Ignition 2 (coils 2+3, wasted spark) | — | |
| W24 | OEM-2-A | KV8-B-1 | 0.5 | no route | Injector 1 | — | |
| W25 | OEM-2-D | KV8-B-2 | 0.5 | no route | Injector 2 | — | |
| W26 | OEM-2-G | KV8-B-3 | 0.5 | no route | Injector 3 | — | |
| W27 | OEM-2-J | KV8-B-4 | 0.5 | no route | Injector 4 | — | |
| W28 | OEM-2-B | KV8-D-9 | 0.5 | no route | Cooling fan relay | — | |
| W29 | OEM-2-C | KV8-B-14 | 0.5 | no route | Condenser fan relay | — | |
| W30 | OEM-2-K | KV8-B-15 | 0.5 | no route | A/C clutch relay | — | |
| W31 | OEM-2-M | KV8-B-16 | 0.5 | no route | Fuel pump relay | — | |
| W32 | OEM-3-H | KV8-B-17 | 0.5 | no route | Main relay | — | |
| W33 | OEM-3-J | KV8-A-10 | 0.5 | no route | Front O2 heater | — | |
| W34 | OEM-3-P | KV8-A-11 | 0.5 | no route | Rear O2 heater | — | |
| W35 | OEM-2-Q | KV8-B-10 | 0.5 | no route | ISC valve low side | — | |
| W36 | OEM-2-E | KV8-B-11 | 0.5 | no route | EGR valve | — | |
| W37 | OEM-2-F | KV8-B-12 | 0.5 | no route | EGR valve | — | |
| W38 | OEM-2-H | KV8-B-13 | 0.5 | no route | EGR valve | — | |
| W39 | OEM-2-I | KV8-B-5 | 0.5 | no route | EGR valve | — | |
| W40 | OEM-2-N | KV8-B-6 | 0.5 | no route | VTCS solenoid (intake butterflies) | — | |
| W41 | OEM-2-R | KV8-B-7 | 0.5 | no route | Malfunction indicator lamp (MIL) | — | |
| W42 | OEM-3-E | KV8-B-8 | 0.5 | no route | Charcoal canister purge | — | |
| W43 | OEM-3-M | KV8-B-18 | 0.5 | no route | Alternator control | — | |
| W44 | OEM-3-U | KV8-B-19 | 0.5 | no route | Charge lamp | — | |
| W45 | OEM-4-D | KV8-B-20 | 0.5 | no route | VVT oil-control solenoid | — | |
| W46 | OEM-4-X | KV8-C-2 | 0.5 | no route | Mass air flow (MAF) | — | |
| W47 | OEM-4-AE | KV8-C-3 | 0.5 | no route | Pressure sensor (Mazda: EGR boost sensor) | — | |
| W48 | OEM-4-V | KV8-C-4 | 0.5 | no route | Throttle position (TPS) | — | |
| W49 | OEM-4-AA | KV8-C-5 | 0.5 | no route | Rear O2 signal | — | |
| W50 | OEM-4-W | KV8-C-6 | 0.5 | no route | Front O2 signal | — | |
| W51 | OEM-4-P | KV8-C-7 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W52 | OEM-4-N | KV8-C-8 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W53 | OEM-4-AD | KV8-C-9 | 0.5 | no route | Fuel level | — | |
| W54 | OEM-3-T | KV8-C-27 | 0.5 | no route | Vehicle speed | — | |
| W55 | OEM-3-S | KV8-C-28 | 0.5 | no route | Immobiliser | — | |
| W56 | OEM-4-B | KV8-C-29 | 0.5 | no route | Brake switch | — | |
| W57 | OEM-4-C | KV8-C-30 | 0.5 | no route | Power steering pressure switch | — | |
| W58 | OEM-4-F | KV8-C-31 | 0.5 | no route | A/C request | — | |
| W59 | OEM-4-H | KV8-C-32 | 0.5 | no route | Neutral switch | — | |
| W60 | OEM-4-I | KV8-C-33 | 0.5 | no route | Clutch switch | — | |
| W61 | OEM-4-J | KV8-C-34 | 0.5 | no route | VTCS vacuum 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 |
| terminal | 3-1447221-4 | TE | Superseal 1.0 socket terminal, 20 AWG (0.5 sq mm) | 55.000 | 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 | KV8 A | 14 of 26 cavities on KV8 A have no pin data (1,2,3,4,5,6,7,8,9,12,13,14,15,19). Anything there is invisible to these checks. |
| warn | NET_FAMILY | OEM-3-M ↔ KV8-B-18 | OEM-3-M "Alternator control" [low_side_out] is wired to KV8-B-18 "Aux 9" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-3-U ↔ KV8-B-19 | OEM-3-U "Charge lamp" [low_side_out] is wired to KV8-B-19 "Aux 10" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-4-D ↔ KV8-B-20 | OEM-4-D "VVT oil-control solenoid" [low_side_out] is wired to KV8-B-20 "Aux 11" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| info | NET_FAMILY | KV8-C-17 ↔ KV8-D-5 | KV8-C-17 "Analog sensor 0V reference" [sensor_ground] is wired to KV8-D-5 "Crank index sensor −" [trigger_in]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs. |
| info | NET_FAMILY | OEM-2-I ↔ KV8-B-5 | OEM-2-I "EGR valve" [low_side_out] is wired to KV8-B-5 "Injection 5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-2-N ↔ KV8-B-6 | OEM-2-N "VTCS solenoid (intake butterflies)" [low_side_out] is wired to KV8-B-6 "Injection 6" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-2-R ↔ KV8-B-7 | OEM-2-R "Malfunction indicator lamp (MIL)" [low_side_out] is wired to KV8-B-7 "Injection 7" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-3-E ↔ KV8-B-8 | OEM-3-E "Charcoal canister purge" [low_side_out] is wired to KV8-B-8 "Injection 8" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-4-N ↔ KV8-C-8 | OEM-4-N "Intake air temperature (IAT)" [temp_in] is wired to KV8-C-8 "Analog in 7" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-4-P ↔ KV8-C-7 | OEM-4-P "Coolant temperature (ECT)" [temp_in] is wired to KV8-C-7 "Analog in 6" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | UNMAPPED | OEM | 2 optional OEM pins are not mapped: OEM-3-D EGR boost solenoid; OEM-3-O Tachometer output |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-4-AG | 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 2026-10-09. Review every wire against both manuals before building. Not wired: - OEM-4 AG: Constant +12V: Emtron KV8 has no battery-constant input; not needed - KV8-D 12: Knock 1 − left open: the stock knock sensor has one ECU wire; check the ECU manual for single-wire knock sensors - OEM-3 O: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on Emtron KV8 - OEM-3 D: EGR boost solenoid: not classified in the library; wire by hand - KV8-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 | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | Link G4X MX5NB2X install manual (NB2 2001-05) | https://linkecu.com/documentation/MX5XNB2.pdf | archive | 2026-10-05 | 741efdd9f2c8 |
| 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 |
| 2 | expert_report | Justin Barrera — Miata NA/NB wiring corrections | — | — | — | — |
| 2 | user_dataset | Subaru ECU Matcher dataset (hiubin), vehicleId=1 | — | — | — | — |