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MX-5 Miata NA8 1996-97 (BP-ZE, 1.8, OBD-II) → rusEFI Proteus (auto)

MX-5 Miata NA8 1996-97 (BP-ZE, 1.8, OBD-II) — rusEFI — Proteus
Drawn by Michael Gnankou · Rev 0 · proposal · 2026-10-11

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.

Statusproposal · not yet verified: nobody has reported building and running this harness
Open errorsnone
Size of the job63 wires · 9 connectors · 0 part lines
ToolsCrimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink
Order of work1. 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.

WireFromToGaugeColourCutLabelCrimp ACrimp BPin APin BContinuity
W1OEM-4-BSP-14V-10.85☐☐☐☐☐☐☐
W2SP-14V-1PROTEUS-Black23-230.85☐☐☐☐☐☐☐
W3OEM-4-ASP-GND-10.85☐☐☐☐☐☐☐
W4OEM-4-CSP-GND-10.85☐☐☐☐☐☐☐
W5OEM-4-DSP-GND-10.85☐☐☐☐☐☐☐
W6OEM-4-KSP-GND-10.85☐☐☐☐☐☐☐
W7SP-GND-1PROTEUS-Black23-140.85☐☐☐☐☐☐☐
W8SP-GND-1PROTEUS-Black23-190.85☐☐☐☐☐☐☐
W9SP-GND-1PROTEUS-Black23-200.85☐☐☐☐☐☐☐
W10SP-GND-1PROTEUS-Black35-170.85☐☐☐☐☐☐☐
W11SP-GND-1PROTEUS-Black35-180.85☐☐☐☐☐☐☐
W12SP-GND-1PROTEUS-Black35-240.85☐☐☐☐☐☐☐
W13OEM-3-OSP-0V-10.5☐☐☐☐☐☐☐
W14OEM-4-HSP-0V-10.5☐☐☐☐☐☐☐
W15SP-0V-1PROTEUS-White35-10.5☐☐☐☐☐☐☐
W16SP-0V-1PROTEUS-White35-20.5☐☐☐☐☐☐☐
W17SP-0V-1PROTEUS-White35-230.5☐☐☐☐☐☐☐
W18SP-0V-1PROTEUS-White35-290.5☐☐☐☐☐☐☐
W19SP-0V-1PROTEUS-White35-30.5☐☐☐☐☐☐☐
W20SP-0V-1PROTEUS-White35-40.5☐☐☐☐☐☐☐
W21SP-0V-1PROTEUS-White35-50.5☐☐☐☐☐☐☐
W22SP-0V-1PROTEUS-White35-60.5☐☐☐☐☐☐☐
W23SP-0V-1PROTEUS-White35-70.5☐☐☐☐☐☐☐
W24SP-0V-1PROTEUS-White35-80.5☐☐☐☐☐☐☐
W25OEM-3-IPROTEUS-White35-100.5☐☐☐☐☐☐☐
W26OEM-4-EPROTEUS-Black23-50.5☐☐☐☐☐☐☐
W27SP-0V-1PROTEUS-Black23-130.5☐☐☐☐☐☐☐
W28OEM-4-GPROTEUS-Black23-10.5☐☐☐☐☐☐☐
W29OEM-4-FPROTEUS-Black23-40.5☐☐☐☐☐☐☐
W30SP-0V-1PROTEUS-Black23-120.5☐☐☐☐☐☐☐
W31OEM-4-NPROTEUS-Black35-350.5☐☐☐☐☐☐☐
W32OEM-4-RPROTEUS-Black35-340.5☐☐☐☐☐☐☐
W33OEM-4-UPROTEUS-Black35-30.5☐☐☐☐☐☐☐
W34OEM-4-VPROTEUS-Black35-150.5☐☐☐☐☐☐☐
W35OEM-4-WPROTEUS-Black35-40.5☐☐☐☐☐☐☐
W36OEM-4-XPROTEUS-Black35-160.5☐☐☐☐☐☐☐
W37OEM-3-BPROTEUS-White35-130.5☐☐☐☐☐☐☐
W38OEM-3-FPROTEUS-White35-240.5☐☐☐☐☐☐☐
W39OEM-3-GPROTEUS-White35-200.5☐☐☐☐☐☐☐
W40OEM-1-APROTEUS-Black35-200.5☐☐☐☐☐☐☐
W41OEM-1-BPROTEUS-Black35-90.5☐☐☐☐☐☐☐
W42OEM-1-GPROTEUS-Black35-210.5☐☐☐☐☐☐☐
W43OEM-1-UPROTEUS-Black35-100.5☐☐☐☐☐☐☐
W44OEM-3-MPROTEUS-Black35-110.5☐☐☐☐☐☐☐
W45OEM-1-EPROTEUS-Black35-120.5☐☐☐☐☐☐☐
W46OEM-4-JPROTEUS-Black35-230.5☐☐☐☐☐☐☐
W47OEM-4-OPROTEUS-Black35-50.5☐☐☐☐☐☐☐
W48OEM-4-PPROTEUS-Black35-60.5☐☐☐☐☐☐☐
W49OEM-4-QPROTEUS-Black35-70.5☐☐☐☐☐☐☐
W50OEM-4-TPROTEUS-Black35-190.5☐☐☐☐☐☐☐
W51OEM-3-HPROTEUS-White35-140.5☐☐☐☐☐☐☐
W52OEM-3-NPROTEUS-White35-250.5☐☐☐☐☐☐☐
W53OEM-3-CPROTEUS-White35-150.5☐☐☐☐☐☐☐
W54OEM-3-DPROTEUS-White35-260.5☐☐☐☐☐☐☐
W55OEM-3-KPROTEUS-White35-300.5☐☐☐☐☐☐☐
W56OEM-3-JPROTEUS-White35-160.5☐☐☐☐☐☐☐
W57OEM-1-MPROTEUS-Black23-20.5☐☐☐☐☐☐☐
W58OEM-1-CPROTEUS-Black23-100.5☐☐☐☐☐☐☐
W59OEM-1-KPROTEUS-Black23-30.5☐☐☐☐☐☐☐
W60OEM-1-LPROTEUS-Black23-90.5☐☐☐☐☐☐☐
W61OEM-1-QPROTEUS-Black23-110.5☐☐☐☐☐☐☐
W62OEM-3-LPROTEUS-White35-270.5☐☐☐☐☐☐☐
W63OEM-3-PPROTEUS-White35-170.5☐☐☐☐☐☐☐

Bench test (before first power-up)

Battery disconnected, ECU and every sensor unplugged. Meter on resistance. Each pair below must read open (OL): a reading means a pinched wire, a stray strand or a mis-pinned cavity. Then check continuity of every wire (last column of the build checklist).

#Probe AProbe BExpectWhyReading
1PROTEUS-White35-10PROTEUS-Black23-12open (OL)5 V sensor reference must not touch sensor ground
2PROTEUS-White35-10PROTEUS-Black23-14open (OL)5 V sensor reference must not touch power ground
3PROTEUS-Black23-12PROTEUS-Black23-23open (OL)sensor ground must not touch +12 V supply
4PROTEUS-Black23-14PROTEUS-Black23-23open (OL)power ground must not touch +12 V supply
5PROTEUS-White35-10PROTEUS-Black23-23open (OL)5 V sensor reference must not touch +12 V supply

If any reading doesn't match, stop and get help before powering up.

Revisions

RevLabelByDate
No revisions yet.

Schematic

OEM-1OEM-3OEM-4PROTEUS-Black23PROTEUS-Black35PROTEUS-White35SP-0VSP-14VSP-GND

Connectors

OEM-1

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
ACooling fan relay (low-side)—W40—0.5PROTEUS-Black35-20———
BA/C condenser fan relay—W41—0.5PROTEUS-Black35-9———
CStarter input (12V while cranking)—W58—0.5PROTEUS-Black23-10———
ECheck engine light (MIL)—W45—0.5PROTEUS-Black35-12———
GA/C clutch relay—W42—0.5PROTEUS-Black35-21———
KA/C pressure switch (A/C request)—W59—0.5PROTEUS-Black23-3———
LClutch switch—W60—0.5PROTEUS-Black23-9———
MVehicle speed sensor (VSS)—W57—0.5PROTEUS-Black23-2———
QBrake switch—W61—0.5PROTEUS-Black23-11———
UFuel pump relay (low-side)—W43—0.5PROTEUS-Black35-10———

OEM-3

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
BMAF sensor input—W37—0.5PROTEUS-White35-13———
CFront O2 sensor input—W53—0.5PROTEUS-White35-15———
DRear O2 sensor input—W54—0.5PROTEUS-White35-26———
FThrottle position (TPS)—W38—0.5PROTEUS-White35-24———
GEngine coolant temp (CLT)—W39—0.5PROTEUS-White35-20———
HEGR boost sensor—W51—0.5PROTEUS-White35-14———
I+5V sensor reference—W25—0.5PROTEUS-White35-10———
JEGR valve position sensor—W56—0.5PROTEUS-White35-16———
KIntake air temp (IAT)—W55—0.5PROTEUS-White35-30———
LIdle switch (closed throttle)—W62—0.5PROTEUS-White35-27———
MFront O2 heater control—W44—0.5PROTEUS-Black35-11———
NEGR boost sensor (2nd channel)—W52—0.5PROTEUS-White35-25———
OSensor ground—W13—0.5SP-0V-1———
PPower steering pressure switch—W63—0.5PROTEUS-White35-17———

OEM-4

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
AChassis ground—W3—0.85SP-GND-1———
BECU power +12V (main relay)—W1—0.85SP-14V-1———
CChassis ground—W4—0.85SP-GND-1———
DChassis ground—W5—0.85SP-GND-1———
ECrank position (CKP) sensor—W26—0.5PROTEUS-Black23-5———
FCAS SGT (cam trigger)—W29—0.5PROTEUS-Black23-4———
GCAS SGC (cam sync)—W28—0.5PROTEUS-Black23-1———
HCrank pickup timing ground (CKP gnd)—W14—0.5SP-0V-1———
IPermanent +12V (battery)————————
JPRC solenoid (FPR control)—W46—0.5PROTEUS-Black35-23———
KChassis ground—W6—0.85SP-GND-1———
LTachometer output————————
NIgnition coil trigger (cyl 1&4)—W31—0.5PROTEUS-Black35-35———
OEGR vent solenoid—W47—0.5PROTEUS-Black35-5———
PEGR vacuum solenoid—W48—0.5PROTEUS-Black35-6———
QIdle air control (IAC) valve—W49—0.5PROTEUS-Black35-7———
RIgnition coil trigger (cyl 2&3)—W32—0.5PROTEUS-Black35-34———
TEVAP purge solenoid—W50—0.5PROTEUS-Black35-19———
UInjector 1 (cyl 1)—W33—0.5PROTEUS-Black35-3———
VInjector 2 (cyl 2)—W34—0.5PROTEUS-Black35-15———
WInjector 3 (cyl 3)—W35—0.5PROTEUS-Black35-4———
XInjector 4 (cyl 4)—W36—0.5PROTEUS-Black35-16———

PROTEUS-Black23

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1Digital 2—W28—0.5OEM-4-G———
10Digital 1—W58—0.5OEM-1-C———
11Digital 6—W61—0.5OEM-1-Q———
12VR 2 negative—W30—0.5SP-0V-1———
13VR 1 negative—W27—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—W57—0.5OEM-1-M———
20Power ground—W9—0.85SP-GND-1———
21CAN 2 Low————————
22CAN 2 High————————
23Main relay feed—W2—0.85SP-14V-1———
3Digital 4—W59—0.5OEM-1-K———
4VR 2 positive—W29—0.5OEM-4-F———
5VR 1 positive—W26—0.5OEM-4-E———
6ETB 1 negative————————
7ETB 1 positive————————
8ETB 2 negative————————
9Digital 5—W60—0.5OEM-1-L———

PROTEUS-Black35

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1Highside 2————————
10Lowside 13—W43—0.5OEM-1-U———
11Lowside 14—W44—0.5OEM-3-M———
12Lowside 15—W45—0.5OEM-1-E———
13Highside 3————————
14Highside 4————————
15Injector 2—W34—0.5OEM-4-V———
16Injector 4—W36—0.5OEM-4-X———
17Power ground—W10—0.85SP-GND-1———
18Power ground—W11—0.85SP-GND-1———
19Injector 8—W50—0.5OEM-4-T———
2Highside 1————————
20Lowside 10—W40—0.5OEM-1-A———
21Lowside 12—W42—0.5OEM-1-G———
22Ignition 3————————
23Lowside 16—W46—0.5OEM-4-J———
24Power ground—W12—0.85SP-GND-1———
25Ignition 12————————
26Ignition 11————————
27Ignition 10————————
28Ignition 9————————
29Ignition 8————————
3Injector 1—W33—0.5OEM-4-U———
30Ignition 7————————
31Ignition 6————————
32Ignition 5————————
33Ignition 4————————
34Ignition 2—W32—0.5OEM-4-R———
35Ignition 1—W31—0.5OEM-4-N———
4Injector 3—W35—0.5OEM-4-W———
5Injector 5—W47—0.5OEM-4-O———
6Injector 6—W48—0.5OEM-4-P———
7Injector 7—W49—0.5OEM-4-Q———
8Injector 9————————
9Lowside 11—W41—0.5OEM-1-B———

PROTEUS-White35

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1Sensor ground—W15—0.5SP-0V-1———
105V supply #2—W25—0.5OEM-3-I———
1112V sensor supply————————
1212V sensor supply————————
13Analog Volt 1—W37—0.5OEM-3-B———
14Analog Volt 3—W51—0.5OEM-3-H———
15Analog Volt 5—W53—0.5OEM-3-C———
16Analog Volt 7—W56—0.5OEM-3-J———
17Analog Volt 9—W63—0.5OEM-3-P———
18Analog Volt 11————————
19Thermistor 1————————
2Sensor ground—W16—0.5SP-0V-1———
20Coolant temp (CLT)—W39—0.5OEM-3-G———
215V supply #1————————
225V supply #2————————
23Sensor ground—W17—0.5SP-0V-1———
24Analog Volt 2—W38—0.5OEM-3-F———
25Analog Volt 4—W52—0.5OEM-3-N———
26Analog Volt 6—W54—0.5OEM-3-D———
27Analog Volt 8—W62—0.5OEM-3-L———
28Analog Volt 10————————
29Sensor ground—W18—0.5SP-0V-1———
3Sensor ground—W19—0.5SP-0V-1———
30Intake air temp (IAT)—W55—0.5OEM-3-K———
31Thermistor 4————————
325V supply #1————————
335V supply #2————————
34Knock 1————————
35Knock 2————————
4Sensor ground—W20—0.5SP-0V-1———
5Sensor ground—W21—0.5SP-0V-1———
6Sensor ground—W22—0.5SP-0V-1———
7Sensor ground—W23—0.5SP-0V-1———
8Sensor ground—W24—0.5SP-0V-1———
95V supply #1————————

SP-0V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W13—0.5OEM-3-O———
1——W14—0.5OEM-4-H———
1——W15—0.5PROTEUS-White35-1———
1——W16—0.5PROTEUS-White35-2———
1——W17—0.5PROTEUS-White35-23———
1——W18—0.5PROTEUS-White35-29———
1——W19—0.5PROTEUS-White35-3———
1——W20—0.5PROTEUS-White35-4———
1——W21—0.5PROTEUS-White35-5———
1——W22—0.5PROTEUS-White35-6———
1——W23—0.5PROTEUS-White35-7———
1——W24—0.5PROTEUS-White35-8———
1——W27—0.5PROTEUS-Black23-13———
1——W30—0.5PROTEUS-Black23-12———

SP-14V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W1—0.85OEM-4-B———
1——W2—0.85PROTEUS-Black23-23———

SP-GND

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W3—0.85OEM-4-A———
1——W4—0.85OEM-4-C———
1——W5—0.85OEM-4-D———
1——W6—0.85OEM-4-K———
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-ACooling fan relay (low-side)low_side_outPROTEUS-Black35-20Lowside 10low_side_outcorroborated
OEM-1-BA/C condenser fan relaylow_side_outPROTEUS-Black35-9Lowside 11low_side_outcorroborated
OEM-1-CStarter input (12V while cranking)digital_inPROTEUS-Black23-10Digital 1digital_incorroborated
OEM-1-ECheck engine light (MIL)low_side_outPROTEUS-Black35-12Lowside 15low_side_outcorroborated
OEM-1-GA/C clutch relaylow_side_outPROTEUS-Black35-21Lowside 12low_side_outcorroborated
OEM-1-KA/C pressure switch (A/C request)digital_inPROTEUS-Black23-3Digital 4digital_incorroborated
OEM-1-LClutch switchdigital_inPROTEUS-Black23-9Digital 5digital_incorroborated
OEM-1-MVehicle speed sensor (VSS)digital_inPROTEUS-Black23-2Digital 3digital_incorroborated
OEM-1-QBrake switchdigital_inPROTEUS-Black23-11Digital 6digital_incorroborated
OEM-1-UFuel pump relay (low-side)low_side_outPROTEUS-Black35-10Lowside 13low_side_outcorroborated
OEM-3-BMAF sensor inputanalog_inPROTEUS-White35-13Analog Volt 1analog_incorroborated
OEM-3-CFront O2 sensor inputlambda_nb_inPROTEUS-White35-15Analog Volt 5analog_incorroborated
OEM-3-DRear O2 sensor inputlambda_nb_inPROTEUS-White35-26Analog Volt 6analog_incorroborated
OEM-3-FThrottle position (TPS)analog_inPROTEUS-White35-24Analog Volt 2analog_incorroborated
OEM-3-GEngine coolant temp (CLT)temp_inPROTEUS-White35-20Coolant temp (CLT)temp_incorroborated
OEM-3-HEGR boost sensoranalog_inPROTEUS-White35-14Analog Volt 3analog_incorroborated
OEM-3-I+5V sensor referencevrefPROTEUS-White35-105V supply #2vrefcorroborated
OEM-3-JEGR valve position sensoranalog_inPROTEUS-White35-16Analog Volt 7analog_incorroborated
OEM-3-KIntake air temp (IAT)temp_inPROTEUS-White35-30Intake air temp (IAT)temp_incorroborated
OEM-3-LIdle switch (closed throttle)digital_inPROTEUS-White35-27Analog Volt 8analog_incorroborated
OEM-3-MFront O2 heater controllow_side_outPROTEUS-Black35-11Lowside 14low_side_outcorroborated
OEM-3-NEGR boost sensor (2nd channel)analog_inPROTEUS-White35-25Analog Volt 4analog_incorroborated
OEM-3-OSensor groundsensor_groundPROTEUS-Black23-12 + PROTEUS-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 2 negative + VR 1 negative + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor groundsensor_ground + trigger_incorroborated
OEM-3-PPower steering pressure switchdigital_inPROTEUS-White35-17Analog Volt 9analog_incorroborated
OEM-4-AChassis 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 groundgroundcorroborated
OEM-4-BECU power +12V (main relay)power_inPROTEUS-Black23-23Main relay feedpower_incorroborated
OEM-4-CChassis 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 groundgroundcorroborated
OEM-4-DChassis 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 groundgroundcorroborated
OEM-4-ECrank position (CKP) sensortrigger_inPROTEUS-Black23-5VR 1 positivetrigger_incorroborated
OEM-4-FCAS SGT (cam trigger)trigger_inPROTEUS-Black23-4VR 2 positivetrigger_incorroborated
OEM-4-GCAS SGC (cam sync)trigger_inPROTEUS-Black23-1Digital 2trigger_incorroborated
OEM-4-HCrank pickup timing ground (CKP gnd)sensor_groundPROTEUS-Black23-12 + PROTEUS-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 2 negative + VR 1 negative + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor groundsensor_ground + trigger_incorroborated
OEM-4-IPermanent +12V (battery)power_in———corroborated
OEM-4-JPRC solenoid (FPR control)low_side_outPROTEUS-Black35-23Lowside 16low_side_outcorroborated
OEM-4-KChassis 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 groundgroundcorroborated
OEM-4-LTachometer outputtacho_out———corroborated
OEM-4-NIgnition coil trigger (cyl 1&4)ignition_outPROTEUS-Black35-35Ignition 1ignition_outcorroborated
OEM-4-OEGR vent solenoidlow_side_outPROTEUS-Black35-5Injector 5injector_outcorroborated
OEM-4-PEGR vacuum solenoidlow_side_outPROTEUS-Black35-6Injector 6injector_outcorroborated
OEM-4-QIdle air control (IAC) valvelow_side_outPROTEUS-Black35-7Injector 7injector_outcorroborated
OEM-4-RIgnition coil trigger (cyl 2&3)ignition_outPROTEUS-Black35-34Ignition 2ignition_outcorroborated
OEM-4-TEVAP purge solenoidlow_side_outPROTEUS-Black35-19Injector 8injector_outcorroborated
OEM-4-UInjector 1 (cyl 1)injector_outPROTEUS-Black35-3Injector 1injector_outcorroborated
OEM-4-VInjector 2 (cyl 2)injector_outPROTEUS-Black35-15Injector 2injector_outcorroborated
OEM-4-WInjector 3 (cyl 3)injector_outPROTEUS-Black35-4Injector 3injector_outcorroborated
OEM-4-XInjector 4 (cyl 4)injector_outPROTEUS-Black35-16Injector 4injector_outcorroborated

Cut list

WireFromToGauge (mm²)ColourLengthSignalIdent
W1OEM-4-BSP-14V-10.85no routeECU power +12V (main relay)—
W2SP-14V-1PROTEUS-Black23-230.85no routeMain relay feed—
W3OEM-4-ASP-GND-10.85no routeChassis ground—
W4OEM-4-CSP-GND-10.85no routeChassis ground—
W5OEM-4-DSP-GND-10.85no routeChassis ground—
W6OEM-4-KSP-GND-10.85no routeChassis 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-3-OSP-0V-10.5no routeSensor ground—
W14OEM-4-HSP-0V-10.5no routeCrank pickup timing ground (CKP gnd)—
W15SP-0V-1PROTEUS-White35-10.5no routeSensor ground—
W16SP-0V-1PROTEUS-White35-20.5no routeSensor ground—
W17SP-0V-1PROTEUS-White35-230.5no routeSensor ground—
W18SP-0V-1PROTEUS-White35-290.5no routeSensor ground—
W19SP-0V-1PROTEUS-White35-30.5no routeSensor ground—
W20SP-0V-1PROTEUS-White35-40.5no routeSensor ground—
W21SP-0V-1PROTEUS-White35-50.5no routeSensor ground—
W22SP-0V-1PROTEUS-White35-60.5no routeSensor ground—
W23SP-0V-1PROTEUS-White35-70.5no routeSensor ground—
W24SP-0V-1PROTEUS-White35-80.5no routeSensor ground—
W25OEM-3-IPROTEUS-White35-100.5no route+5V sensor reference—
W26OEM-4-EPROTEUS-Black23-50.5no routeCrank position (CKP) sensor—
W27SP-0V-1PROTEUS-Black23-130.5no routeVR 1 negative—
W28OEM-4-GPROTEUS-Black23-10.5no routeCAS SGC (cam sync)—
W29OEM-4-FPROTEUS-Black23-40.5no routeCAS SGT (cam trigger)—
W30SP-0V-1PROTEUS-Black23-120.5no routeVR 2 negative—
W31OEM-4-NPROTEUS-Black35-350.5no routeIgnition coil trigger (cyl 1&4)—
W32OEM-4-RPROTEUS-Black35-340.5no routeIgnition coil trigger (cyl 2&3)—
W33OEM-4-UPROTEUS-Black35-30.5no routeInjector 1 (cyl 1)—
W34OEM-4-VPROTEUS-Black35-150.5no routeInjector 2 (cyl 2)—
W35OEM-4-WPROTEUS-Black35-40.5no routeInjector 3 (cyl 3)—
W36OEM-4-XPROTEUS-Black35-160.5no routeInjector 4 (cyl 4)—
W37OEM-3-BPROTEUS-White35-130.5no routeMAF sensor input—
W38OEM-3-FPROTEUS-White35-240.5no routeThrottle position (TPS)—
W39OEM-3-GPROTEUS-White35-200.5no routeEngine coolant temp (CLT)—
W40OEM-1-APROTEUS-Black35-200.5no routeCooling fan relay (low-side)—
W41OEM-1-BPROTEUS-Black35-90.5no routeA/C condenser fan relay—
W42OEM-1-GPROTEUS-Black35-210.5no routeA/C clutch relay—
W43OEM-1-UPROTEUS-Black35-100.5no routeFuel pump relay (low-side)—
W44OEM-3-MPROTEUS-Black35-110.5no routeFront O2 heater control—
W45OEM-1-EPROTEUS-Black35-120.5no routeCheck engine light (MIL)—
W46OEM-4-JPROTEUS-Black35-230.5no routePRC solenoid (FPR control)—
W47OEM-4-OPROTEUS-Black35-50.5no routeEGR vent solenoid—
W48OEM-4-PPROTEUS-Black35-60.5no routeEGR vacuum solenoid—
W49OEM-4-QPROTEUS-Black35-70.5no routeIdle air control (IAC) valve—
W50OEM-4-TPROTEUS-Black35-190.5no routeEVAP purge solenoid—
W51OEM-3-HPROTEUS-White35-140.5no routeEGR boost sensor—
W52OEM-3-NPROTEUS-White35-250.5no routeEGR boost sensor (2nd channel)—
W53OEM-3-CPROTEUS-White35-150.5no routeFront O2 sensor input—
W54OEM-3-DPROTEUS-White35-260.5no routeRear O2 sensor input—
W55OEM-3-KPROTEUS-White35-300.5no routeIntake air temp (IAT)—
W56OEM-3-JPROTEUS-White35-160.5no routeEGR valve position sensor—
W57OEM-1-MPROTEUS-Black23-20.5no routeVehicle speed sensor (VSS)—
W58OEM-1-CPROTEUS-Black23-100.5no routeStarter input (12V while cranking)—
W59OEM-1-KPROTEUS-Black23-30.5no routeA/C pressure switch (A/C request)—
W60OEM-1-LPROTEUS-Black23-90.5no routeClutch switch—
W61OEM-1-QPROTEUS-Black23-110.5no routeBrake switch—
W62OEM-3-LPROTEUS-White35-270.5no routeIdle switch (closed throttle)—
W63OEM-3-PPROTEUS-White35-170.5no routePower steering pressure switch—

Bill of materials

CategoryPart numberManufacturerDescriptionQtyUnit

ECU setup sheet

RoleEngine refEngine signalSensorECU pointECU functionECU classSetup flag
No configured channels.

Findings

Open (8)

SeverityCodeSubjectMessage
warnNET_FAMILYOEM-3-L ↔ PROTEUS-White35-27OEM-3-L "Idle switch (closed throttle)" [digital_in] is wired to PROTEUS-White35-27 "Analog Volt 8" [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.
warnNET_FAMILYOEM-3-P ↔ PROTEUS-White35-17OEM-3-P "Power steering pressure switch" [digital_in] is wired to PROTEUS-White35-17 "Analog Volt 9" [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-4-O ↔ PROTEUS-Black35-5OEM-4-O "EGR vent solenoid" [low_side_out] is wired to PROTEUS-Black35-5 "Injector 5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
infoNET_FAMILYOEM-4-P ↔ PROTEUS-Black35-6OEM-4-P "EGR vacuum solenoid" [low_side_out] is wired to PROTEUS-Black35-6 "Injector 6" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
infoNET_FAMILYOEM-4-Q ↔ PROTEUS-Black35-7OEM-4-Q "Idle air control (IAC) valve" [low_side_out] is wired to PROTEUS-Black35-7 "Injector 7" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
infoNET_FAMILYOEM-4-T ↔ PROTEUS-Black35-19OEM-4-T "EVAP purge solenoid" [low_side_out] is wired to PROTEUS-Black35-19 "Injector 8" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
infoNET_FAMILYPROTEUS-White35-29 ↔ PROTEUS-Black23-13PROTEUS-White35-29 "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.
infoUNMAPPEDOEM1 optional OEM pins are not mapped: OEM-4-L Tachometer output

Accepted (1)

CodeSubjectReasonBy
REQUIRED_UNMAPPEDOEM-4-IBattery-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 2026-10-11. Review every wire against both manuals before building. Not wired: - OEM-4 I: Permanent +12V (battery): rusEFI Proteus has no battery-constant input; not needed - OEM-4 L: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on rusEFI Proteus - PROTEUS-Black23 18: Ignition switch in: not fed (the stock ECU has no ignition-sense pin); feed it from a switched-ignition source

Sources

ReliabilityKindTitleURLArchiveCapturedSHA-256
4vendor_docAEM EMS 30-1720 Plug-and-Play adapter manual (1996-97 Miata)https://static.summitracing.com/global/images/instructions/avm-30-1720.pdf———
4vendor_docrusEFI Proteus — board connector definitions (Black35 / White35 / Black23)https://github.com/rusefi/rusefi/tree/master/firmware/config/boards/proteus/connectorsarchive2026-10-05738a2ea934c0
3community_copyMellens.net: 1996 Mazda Miata wiring diagrams (FSM-derived)http://www.mellens.net/mazda/mazda_miata_extra_manual/1996_wiring.pdf———