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MX-5 Miata NA6 1990-93 (B6-ZE, 1.6) → rusEFI Proteus (auto)

MX-5 Miata NA6 1990-93 (B6-ZE, 1.6) — rusEFI — Proteus
Drawn by Michael Gnankou · Rev 0 · proposal · 2026-10-05

Revisions

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Schematic

OEM-1OEM-2PROTEUS-Black23PROTEUS-Black35PROTEUS-White35SP-0VSP-14VSP-GND

Connectors

OEM-1

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
AConstant +12V————————
BECU power +14V (main relay)—W1—0.85SP-14V-1———
CStart signal—W40—0.5PROTEUS-Black23-10———
EMalfunction indicator lamp (MIL)—W34—0.5PROTEUS-Black35-20———
GIgnition 1 (coils 1+4, wasted spark)—W28—0.5PROTEUS-Black35-35———
HIgnition 2 (coils 2+3, wasted spark)—W29—0.5PROTEUS-Black35-34———
NWide-open throttle switch—W41—0.5PROTEUS-Black23-3———
PPower steering pressure switch—W42—0.5PROTEUS-Black23-9———
QA/C request—W43—0.5PROTEUS-Black23-11———
VNeutral/clutch switch—W44—0.5PROTEUS-Black23-2———

OEM-2

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
APower ground—W3—0.85SP-GND-1———
BPower ground—W4—0.85SP-GND-1———
CPower ground—W5—0.85SP-GND-1———
DPower ground—W6—0.85SP-GND-1———
ECrank position (CAS NE)—W25—0.5PROTEUS-Black23-5———
FAFM ground—W13—0.5SP-0V-1———
GCam position (CAS G)—W27—0.5PROTEUS-Black23-1———
ITachometer output—W35—0.5PROTEUS-Black35-9———
K+5V sensor supply—W24—0.5PROTEUS-White35-10———
LIdle switch (TPS)—W45—0.5PROTEUS-White35-14———
NO2 sensor—W37—0.5PROTEUS-White35-24———
OAir flow meter (AFM)—W36—0.5PROTEUS-White35-13———
PIntake air temperature (IAT)—W39—0.5PROTEUS-White35-30———
QCoolant temperature (ECT)—W38—0.5PROTEUS-White35-20———
UInjector 1—W30—0.5PROTEUS-Black35-3———
VInjector 2—W31—0.5PROTEUS-Black35-15———
YInjector 3—W32—0.5PROTEUS-Black35-4———
ZInjector 4—W33—0.5PROTEUS-Black35-16———

PROTEUS-Black23

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1Digital 2—W27—0.5OEM-2-G———
10Digital 1—W40—0.5OEM-1-C———
11Digital 6—W43—0.5OEM-1-Q———
12VR 2 negative————————
13VR 1 negative—W26—0.5SP-0V-1———
14Power ground—W7—0.85SP-GND-1———
15ETB 2 positive————————
16CAN 1 Low————————
17CAN 1 High————————
18Ignition switch in————————
19Power ground—W8—0.85SP-GND-1———
2Digital 3—W44—0.5OEM-1-V———
20Power ground—W9—0.85SP-GND-1———
21CAN 2 Low————————
22CAN 2 High————————
23Main relay feed—W2—0.85SP-14V-1———
3Digital 4—W41—0.5OEM-1-N———
4VR 2 positive————————
5VR 1 positive—W25—0.5OEM-2-E———
6ETB 1 negative————————
7ETB 1 positive————————
8ETB 2 negative————————
9Digital 5—W42—0.5OEM-1-P———

PROTEUS-Black35

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1Highside 2————————
10Lowside 13————————
11Lowside 14————————
12Lowside 15————————
13Highside 3————————
14Highside 4————————
15Injector 2—W31—0.5OEM-2-V———
16Injector 4—W33—0.5OEM-2-Z———
17Power ground—W10—0.85SP-GND-1———
18Power ground—W11—0.85SP-GND-1———
19Injector 8————————
2Highside 1————————
20Lowside 10—W34—0.5OEM-1-E———
21Lowside 12————————
22Ignition 3————————
23Lowside 16————————
24Power ground—W12—0.85SP-GND-1———
25Ignition 12————————
26Ignition 11————————
27Ignition 10————————
28Ignition 9————————
29Ignition 8————————
3Injector 1—W30—0.5OEM-2-U———
30Ignition 7————————
31Ignition 6————————
32Ignition 5————————
33Ignition 4————————
34Ignition 2—W29—0.5OEM-1-H———
35Ignition 1—W28—0.5OEM-1-G———
4Injector 3—W32—0.5OEM-2-Y———
5Injector 5————————
6Injector 6————————
7Injector 7————————
8Injector 9————————
9Lowside 11—W35—0.5OEM-2-I———

PROTEUS-White35

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1Sensor ground—W14—0.5SP-0V-1———
105V supply #2—W24—0.5OEM-2-K———
1112V sensor supply————————
1212V sensor supply————————
13Analog Volt 1—W36—0.5OEM-2-O———
14Analog Volt 3—W45—0.5OEM-2-L———
15Analog Volt 5————————
16Analog Volt 7————————
17Analog Volt 9————————
18Analog Volt 11————————
19Thermistor 1————————
2Sensor ground—W15—0.5SP-0V-1———
20Coolant temp (CLT)—W38—0.5OEM-2-Q———
215V supply #1————————
225V supply #2————————
23Sensor ground—W16—0.5SP-0V-1———
24Analog Volt 2—W37—0.5OEM-2-N———
25Analog Volt 4————————
26Analog Volt 6————————
27Analog Volt 8————————
28Analog Volt 10————————
29Sensor ground—W17—0.5SP-0V-1———
3Sensor ground—W18—0.5SP-0V-1———
30Intake air temp (IAT)—W39—0.5OEM-2-P———
31Thermistor 4————————
325V supply #1————————
335V supply #2————————
34Knock 1————————
35Knock 2————————
4Sensor ground—W19—0.5SP-0V-1———
5Sensor ground—W20—0.5SP-0V-1———
6Sensor ground—W21—0.5SP-0V-1———
7Sensor ground—W22—0.5SP-0V-1———
8Sensor ground—W23—0.5SP-0V-1———
95V supply #1————————

SP-0V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W13—0.5OEM-2-F———
1——W14—0.5PROTEUS-White35-1———
1——W15—0.5PROTEUS-White35-2———
1——W16—0.5PROTEUS-White35-23———
1——W17—0.5PROTEUS-White35-29———
1——W18—0.5PROTEUS-White35-3———
1——W19—0.5PROTEUS-White35-4———
1——W20—0.5PROTEUS-White35-5———
1——W21—0.5PROTEUS-White35-6———
1——W22—0.5PROTEUS-White35-7———
1——W23—0.5PROTEUS-White35-8———
1——W26—0.5PROTEUS-Black23-13———

SP-14V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W1—0.85OEM-1-B———
1——W2—0.85PROTEUS-Black23-23———

SP-GND

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W3—0.85OEM-2-A———
1——W4—0.85OEM-2-B———
1——W5—0.85OEM-2-C———
1——W6—0.85OEM-2-D———
1——W7—0.85PROTEUS-Black23-14———
1——W8—0.85PROTEUS-Black23-19———
1——W9—0.85PROTEUS-Black23-20———
1——W10—0.85PROTEUS-Black35-17———
1——W11—0.85PROTEUS-Black35-18———
1——W12—0.85PROTEUS-Black35-24———

Pin map

OEM pointOEM functionOEM familyTarget pointTarget functionTarget familyWire colourEvidence
OEM-1-AConstant +12Vpower_in———single_source
OEM-1-BECU power +14V (main relay)power_inPROTEUS-Black23-23Main relay feedpower_insingle_source
OEM-1-CStart signaldigital_inPROTEUS-Black23-10Digital 1digital_insingle_source
OEM-1-EMalfunction indicator lamp (MIL)low_side_outPROTEUS-Black35-20Lowside 10low_side_outsingle_source
OEM-1-GIgnition 1 (coils 1+4, wasted spark)ignition_outPROTEUS-Black35-35Ignition 1ignition_outsingle_source
OEM-1-HIgnition 2 (coils 2+3, wasted spark)ignition_outPROTEUS-Black35-34Ignition 2ignition_outsingle_source
OEM-1-NWide-open throttle switchdigital_inPROTEUS-Black23-3Digital 4digital_insingle_source
OEM-1-PPower steering pressure switchdigital_inPROTEUS-Black23-9Digital 5digital_insingle_source
OEM-1-QA/C requestdigital_inPROTEUS-Black23-11Digital 6digital_insingle_source
OEM-1-VNeutral/clutch switchdigital_inPROTEUS-Black23-2Digital 3digital_insingle_source
OEM-2-APower groundgroundPROTEUS-Black23-14 + PROTEUS-Black23-19 + PROTEUS-Black23-20 + PROTEUS-Black35-17 + PROTEUS-Black35-18 + PROTEUS-Black35-24Power ground + Power ground + Power ground + Power ground + Power ground + Power groundgroundsingle_source
OEM-2-BPower groundgroundPROTEUS-Black23-14 + PROTEUS-Black23-19 + PROTEUS-Black23-20 + PROTEUS-Black35-17 + PROTEUS-Black35-18 + PROTEUS-Black35-24Power ground + Power ground + Power ground + Power ground + Power ground + Power groundgroundsingle_source
OEM-2-CPower groundgroundPROTEUS-Black23-14 + PROTEUS-Black23-19 + PROTEUS-Black23-20 + PROTEUS-Black35-17 + PROTEUS-Black35-18 + PROTEUS-Black35-24Power ground + Power ground + Power ground + Power ground + Power ground + Power groundgroundsingle_source
OEM-2-DPower groundgroundPROTEUS-Black23-14 + PROTEUS-Black23-19 + PROTEUS-Black23-20 + PROTEUS-Black35-17 + PROTEUS-Black35-18 + PROTEUS-Black35-24Power ground + Power ground + Power ground + Power ground + Power ground + Power groundgroundsingle_source
OEM-2-ECrank position (CAS NE)trigger_inPROTEUS-Black23-5VR 1 positivetrigger_insingle_source
OEM-2-FAFM groundsensor_groundPROTEUS-Black23-13 + PROTEUS-White35-1 + PROTEUS-White35-2 + PROTEUS-White35-23 + PROTEUS-White35-29 + PROTEUS-White35-3 + PROTEUS-White35-4 + PROTEUS-White35-5 + PROTEUS-White35-6 + PROTEUS-White35-7 + PROTEUS-White35-8VR 1 negative + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor groundsensor_ground + trigger_insingle_source
OEM-2-GCam position (CAS G)trigger_inPROTEUS-Black23-1Digital 2trigger_insingle_source
OEM-2-ITachometer outputtacho_outPROTEUS-Black35-9Lowside 11low_side_outsingle_source
OEM-2-K+5V sensor supplyvrefPROTEUS-White35-105V supply #2vrefsingle_source
OEM-2-LIdle switch (TPS)digital_inPROTEUS-White35-14Analog Volt 3analog_insingle_source
OEM-2-NO2 sensorlambda_nb_inPROTEUS-White35-24Analog Volt 2analog_insingle_source
OEM-2-OAir flow meter (AFM)analog_inPROTEUS-White35-13Analog Volt 1analog_insingle_source
OEM-2-PIntake air temperature (IAT)temp_inPROTEUS-White35-30Intake air temp (IAT)temp_insingle_source
OEM-2-QCoolant temperature (ECT)temp_inPROTEUS-White35-20Coolant temp (CLT)temp_insingle_source
OEM-2-UInjector 1injector_outPROTEUS-Black35-3Injector 1injector_outsingle_source
OEM-2-VInjector 2injector_outPROTEUS-Black35-15Injector 2injector_outsingle_source
OEM-2-YInjector 3injector_outPROTEUS-Black35-4Injector 3injector_outsingle_source
OEM-2-ZInjector 4injector_outPROTEUS-Black35-16Injector 4injector_outsingle_source

Cut list

WireFromToGauge (mm²)ColourLengthSignalIdent
W1OEM-1-BSP-14V-10.85no routeECU power +14V (main relay)—
W2SP-14V-1PROTEUS-Black23-230.85no routeMain relay feed—
W3OEM-2-ASP-GND-10.85no routePower ground—
W4OEM-2-BSP-GND-10.85no routePower ground—
W5OEM-2-CSP-GND-10.85no routePower ground—
W6OEM-2-DSP-GND-10.85no routePower ground—
W7SP-GND-1PROTEUS-Black23-140.85no routePower ground—
W8SP-GND-1PROTEUS-Black23-190.85no routePower ground—
W9SP-GND-1PROTEUS-Black23-200.85no routePower ground—
W10SP-GND-1PROTEUS-Black35-170.85no routePower ground—
W11SP-GND-1PROTEUS-Black35-180.85no routePower ground—
W12SP-GND-1PROTEUS-Black35-240.85no routePower ground—
W13OEM-2-FSP-0V-10.5no routeAFM ground—
W14SP-0V-1PROTEUS-White35-10.5no routeSensor ground—
W15SP-0V-1PROTEUS-White35-20.5no routeSensor ground—
W16SP-0V-1PROTEUS-White35-230.5no routeSensor ground—
W17SP-0V-1PROTEUS-White35-290.5no routeSensor ground—
W18SP-0V-1PROTEUS-White35-30.5no routeSensor ground—
W19SP-0V-1PROTEUS-White35-40.5no routeSensor ground—
W20SP-0V-1PROTEUS-White35-50.5no routeSensor ground—
W21SP-0V-1PROTEUS-White35-60.5no routeSensor ground—
W22SP-0V-1PROTEUS-White35-70.5no routeSensor ground—
W23SP-0V-1PROTEUS-White35-80.5no routeSensor ground—
W24OEM-2-KPROTEUS-White35-100.5no route+5V sensor supply—
W25OEM-2-EPROTEUS-Black23-50.5no routeCrank position (CAS NE)—
W26SP-0V-1PROTEUS-Black23-130.5no routeVR 1 negative—
W27OEM-2-GPROTEUS-Black23-10.5no routeCam position (CAS G)—
W28OEM-1-GPROTEUS-Black35-350.5no routeIgnition 1 (coils 1+4, wasted spark)—
W29OEM-1-HPROTEUS-Black35-340.5no routeIgnition 2 (coils 2+3, wasted spark)—
W30OEM-2-UPROTEUS-Black35-30.5no routeInjector 1—
W31OEM-2-VPROTEUS-Black35-150.5no routeInjector 2—
W32OEM-2-YPROTEUS-Black35-40.5no routeInjector 3—
W33OEM-2-ZPROTEUS-Black35-160.5no routeInjector 4—
W34OEM-1-EPROTEUS-Black35-200.5no routeMalfunction indicator lamp (MIL)—
W35OEM-2-IPROTEUS-Black35-90.5no routeTachometer output—
W36OEM-2-OPROTEUS-White35-130.5no routeAir flow meter (AFM)—
W37OEM-2-NPROTEUS-White35-240.5no routeO2 sensor—
W38OEM-2-QPROTEUS-White35-200.5no routeCoolant temperature (ECT)—
W39OEM-2-PPROTEUS-White35-300.5no routeIntake air temperature (IAT)—
W40OEM-1-CPROTEUS-Black23-100.5no routeStart signal—
W41OEM-1-NPROTEUS-Black23-30.5no routeWide-open throttle switch—
W42OEM-1-PPROTEUS-Black23-90.5no routePower steering pressure switch—
W43OEM-1-QPROTEUS-Black23-110.5no routeA/C request—
W44OEM-1-VPROTEUS-Black23-20.5no routeNeutral/clutch switch—
W45OEM-2-LPROTEUS-White35-140.5no routeIdle switch (TPS)—

Bill of materials

CategoryPart numberManufacturerDescriptionQtyUnit

ECU setup sheet

RoleEngine refEngine signalSensorECU pointECU functionECU classSetup flag
No configured channels.

Findings

Open (3)

SeverityCodeSubjectMessage
warnNET_FAMILYOEM-2-L ↔ PROTEUS-White35-14OEM-2-L "Idle switch (TPS)" [digital_in] is wired to PROTEUS-White35-14 "Analog Volt 3" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value.
infoNET_FAMILYOEM-2-I ↔ PROTEUS-Black35-9OEM-2-I "Tachometer output" [tacho_out] is wired to PROTEUS-Black35-9 "Lowside 11" [low_side_out]. Tacho as a low-side output: check the tach needs a pull-up.
infoNET_FAMILYPROTEUS-White35-1 ↔ PROTEUS-Black23-13PROTEUS-White35-1 "Sensor ground" [sensor_ground] is wired to PROTEUS-Black23-13 "VR 1 negative" [trigger_in]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs.

Accepted (1)

CodeSubjectReasonBy
REQUIRED_UNMAPPEDOEM-1-ABattery-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: rusEFI Proteus has no battery-constant input; not needed - PROTEUS-Black23 18: Ignition switch in: not fed (the stock ECU has no ignition-sense pin); feed it from a switched-ignition source

Sources

ReliabilityKindTitleURL
4vendor_docLink G4X MX5X install manual (NA 1.6/1.8)https://linkecu.com/documentation/MX5X.pdf
4vendor_docrusEFI Proteus — board connector definitions (Black35 / White35 / Black23)https://github.com/rusefi/rusefi/tree/master/firmware/config/boards/proteus/connectors