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MX-5 Miata NA8 1994-97 (BP-ZE, 1.8) → AMP EFI MS3Pro EVO+ (auto)

MX-5 Miata NA8 1994-97 (BP-ZE, 1.8) — AMP EFI — MS3Pro EVO+
Drawn by Michael Gnankou · Rev 0 · proposal · 2026-10-05

Revisions

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Schematic

MS3PROEVO-AMS3PROEVO-BMS3PROEVO-COEM-1OEM-2SP-0VSP-14VSP-GND

Connectors

MS3PROEVO-A

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1High current out 1————————
10MAT in—W42—0.5OEM-2-Q———
11CLT in—W43—0.5OEM-2-P———
12Analog In 6————————
13Logic Ground—W12—0.5SP-0V-1———
14PWM / Idle Out 1—W31—0.5OEM-1-R———
15CKP−—W21—0.5SP-0V-1———
16Ground Shield Drain————————
17Analog In 7————————
18Sensor return—W13—0.5SP-0V-1———
19Analog in 1—W39—0.5OEM-2-O———
2High current out 2————————
20Analog in 2————————
21Analog in 3————————
22Analog In 4————————
23Analog In 5————————
24Tach out—W38—0.5OEM-2-I———
25O2 in—W41—0.5OEM-2-N———
26CMP+—W22—0.5OEM-2-G———
27CMP−—W23—0.5SP-0V-1———
28Fuel pump relay out—W30—0.5OEM-1-J———
29PWM out 2—W33—0.5OEM-2-T———
3Injector out J—W26—0.5OEM-2-U———
30PWM out 3—W35—0.5OEM-1-E———
31Knock in 1————————
32Digital switched in 1—W45—0.5OEM-1-C———
33CAN L————————
34CAN H————————
3512V+ switched power in—W2—0.85SP-14V-1———
4Injector out I—W27—0.5OEM-2-V———
5High current out 3————————
6CKP+—W20—0.5OEM-2-E———
7Knock In 2————————
85V+ VREF out—W19—0.5OEM-2-K———
9TPS in—W40—0.5OEM-2-M———

MS3PROEVO-B

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1Injector out A—W28—0.5OEM-2-Y———
10Injector out F—W29—0.5OEM-2-Z———
11Injector out G————————
12Injector out H————————
13Spark out G—W24—0.5OEM-1-G———
14Spark out E—W25—0.5OEM-1-H———
15Spark out C————————
16Spark out H————————
17Digital frequency in 2 (Hall)————————
18Ground Shield Drain————————
19Digital switched 12V in————————
2Injector out B————————
20Digital switched in 2—W46—0.5OEM-1-P———
21Digital frequency in 3 (unconditioned)————————
22Digital Frequency in 3 (VR+)————————
23Digital Frequency In 3 (VR−)————————
24Spark out F————————
25Spark out B————————
26Spark out D————————
27Spark out A————————
28Digital frequency in 1 (unconditioned)—W44—0.5OEM-1-M———
29Digital switched in 3—W47—0.5OEM-1-Q———
3Ground—W7—0.85SP-GND-1———
30Stepper IAC out 1B————————
31Stepper IAC out 1A————————
32Stepper IAC out 2A————————
33Stepper IAC out 2B————————
34Digital Frequency in 1 (VR+)————————
35Digital Frequency in 1 (VR−)————————
4Injector out C————————
5Ground—W8—0.85SP-GND-1———
6Injector out D————————
7Ground—W9—0.85SP-GND-1———
8Injector out E————————
9Ground—W10—0.85SP-GND-1———

MS3PROEVO-C

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1PWM out 5—W37—0.5OEM-2-X———
10Digital switched in 5————————
11Digital switched in 4—W48—0.5OEM-1-V———
12Digital I/O 5————————
13Digital I/O 3————————
14Digital I/O 1————————
155V+ VREF out 2————————
17Sensor return—W14—0.5SP-0V-1———
18Sensor return—W15—0.5SP-0V-1———
19Sensor return—W16—0.5SP-0V-1———
2PWM out 4—W36—0.5OEM-2-R———
20Sensor return—W17—0.5SP-0V-1———
21Sensor return—W18—0.5SP-0V-1———
225V+ VREF out 1————————
3Digital out 2—W34—0.5OEM-2-W———
4Digital out 1—W32—0.5OEM-2-S———
5Digital I/O 4————————
6Digital I/O 2————————
7Analog in 8————————

OEM-1

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
AConstant +12V————————
BECU power +14V (main relay)—W1—0.85SP-14V-1———
CStart signal—W45—0.5MS3PROEVO-A-32———
EMalfunction indicator lamp (MIL)—W35—0.5MS3PROEVO-A-30———
GIgnition 1 (coils 1+4, wasted spark)—W24—0.5MS3PROEVO-B-13———
HIgnition 2 (coils 2+3, wasted spark)—W25—0.5MS3PROEVO-B-14———
JA/C relay—W30—0.5MS3PROEVO-A-28———
MVehicle speed—W44—0.5MS3PROEVO-B-28———
PPower steering pressure switch—W46—0.5MS3PROEVO-B-20———
QA/C request—W47—0.5MS3PROEVO-B-29———
RCooling fan relay—W31—0.5MS3PROEVO-A-14———
VNeutral/clutch switch—W48—0.5MS3PROEVO-C-11———

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)—W20—0.5MS3PROEVO-A-6———
FMAF ground—W11—0.5SP-0V-1———
GCam position (CAS G)—W22—0.5MS3PROEVO-A-26———
ITachometer output—W38—0.5MS3PROEVO-A-24———
K+5V sensor supply—W19—0.5MS3PROEVO-A-8———
MThrottle position (TPS)—W40—0.5MS3PROEVO-A-9———
NO2 sensor—W41—0.5MS3PROEVO-A-25———
OMass air flow (MAF)—W39—0.5MS3PROEVO-A-19———
PIntake air temperature (IAT)—W43—0.5MS3PROEVO-A-11———
QCoolant temperature (ECT)—W42—0.5MS3PROEVO-A-10———
RPRC solenoid (fuel pressure regulator)—W36—0.5MS3PROEVO-C-2———
SCondenser fan relay—W32—0.5MS3PROEVO-C-4———
TFuel pump relay—W33—0.5MS3PROEVO-A-29———
UInjector 1—W26—0.5MS3PROEVO-A-3———
VInjector 2—W27—0.5MS3PROEVO-A-4———
WISC solenoid—W34—0.5MS3PROEVO-C-3———
XEvap purge solenoid—W37—0.5MS3PROEVO-C-1———
YInjector 3—W28—0.5MS3PROEVO-B-1———
ZInjector 4—W29—0.5MS3PROEVO-B-10———

SP-0V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W11—0.5OEM-2-F———
1——W12—0.5MS3PROEVO-A-13———
1——W13—0.5MS3PROEVO-A-18———
1——W14—0.5MS3PROEVO-C-17———
1——W15—0.5MS3PROEVO-C-18———
1——W16—0.5MS3PROEVO-C-19———
1——W17—0.5MS3PROEVO-C-20———
1——W18—0.5MS3PROEVO-C-21———
1——W21—0.5MS3PROEVO-A-15———
1——W23—0.5MS3PROEVO-A-27———

SP-14V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W1—0.85OEM-1-B———
1——W2—0.85MS3PROEVO-A-35———

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—0.85MS3PROEVO-B-3———
1——W8—0.85MS3PROEVO-B-5———
1——W9—0.85MS3PROEVO-B-7———
1——W10—0.85MS3PROEVO-B-9———

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_inMS3PROEVO-A-3512V+ switched power inpower_insingle_source
OEM-1-CStart signaldigital_inMS3PROEVO-A-32Digital switched in 1digital_insingle_source
OEM-1-EMalfunction indicator lamp (MIL)low_side_outMS3PROEVO-A-30PWM out 3low_side_outsingle_source
OEM-1-GIgnition 1 (coils 1+4, wasted spark)ignition_outMS3PROEVO-B-13Spark out Gignition_outsingle_source
OEM-1-HIgnition 2 (coils 2+3, wasted spark)ignition_outMS3PROEVO-B-14Spark out Eignition_outsingle_source
OEM-1-JA/C relaylow_side_outMS3PROEVO-A-28Fuel pump relay outlow_side_outsingle_source
OEM-1-MVehicle speeddigital_inMS3PROEVO-B-28Digital frequency in 1 (unconditioned)digital_insingle_source
OEM-1-PPower steering pressure switchdigital_inMS3PROEVO-B-20Digital switched in 2digital_insingle_source
OEM-1-QA/C requestdigital_inMS3PROEVO-B-29Digital switched in 3digital_insingle_source
OEM-1-RCooling fan relaylow_side_outMS3PROEVO-A-14PWM / Idle Out 1low_side_outsingle_source
OEM-1-VNeutral/clutch switchdigital_inMS3PROEVO-C-11Digital switched in 4digital_insingle_source
OEM-2-APower groundgroundMS3PROEVO-B-3 + MS3PROEVO-B-5 + MS3PROEVO-B-7 + MS3PROEVO-B-9Ground + Ground + Ground + Groundgroundsingle_source
OEM-2-BPower groundgroundMS3PROEVO-B-3 + MS3PROEVO-B-5 + MS3PROEVO-B-7 + MS3PROEVO-B-9Ground + Ground + Ground + Groundgroundsingle_source
OEM-2-CPower groundgroundMS3PROEVO-B-3 + MS3PROEVO-B-5 + MS3PROEVO-B-7 + MS3PROEVO-B-9Ground + Ground + Ground + Groundgroundsingle_source
OEM-2-DPower groundgroundMS3PROEVO-B-3 + MS3PROEVO-B-5 + MS3PROEVO-B-7 + MS3PROEVO-B-9Ground + Ground + Ground + Groundgroundsingle_source
OEM-2-ECrank position (CAS NE)trigger_inMS3PROEVO-A-6CKP+trigger_insingle_source
OEM-2-FMAF groundsensor_groundMS3PROEVO-A-13 + MS3PROEVO-A-15 + MS3PROEVO-A-18 + MS3PROEVO-A-27 + MS3PROEVO-C-17 + MS3PROEVO-C-18 + MS3PROEVO-C-19 + MS3PROEVO-C-20 + MS3PROEVO-C-21Logic Ground + CKP− + Sensor return + CMP− + Sensor return + Sensor return + Sensor return + Sensor return + Sensor returnsensor_ground + trigger_insingle_source
OEM-2-GCam position (CAS G)trigger_inMS3PROEVO-A-26CMP+trigger_insingle_source
OEM-2-ITachometer outputtacho_outMS3PROEVO-A-24Tach outtacho_outsingle_source
OEM-2-K+5V sensor supplyvrefMS3PROEVO-A-85V+ VREF outvrefsingle_source
OEM-2-MThrottle position (TPS)analog_inMS3PROEVO-A-9TPS inanalog_insingle_source
OEM-2-NO2 sensorlambda_nb_inMS3PROEVO-A-25O2 inlambda_nb_insingle_source
OEM-2-OMass air flow (MAF)analog_inMS3PROEVO-A-19Analog in 1analog_insingle_source
OEM-2-PIntake air temperature (IAT)temp_inMS3PROEVO-A-11CLT intemp_insingle_source
OEM-2-QCoolant temperature (ECT)temp_inMS3PROEVO-A-10MAT intemp_insingle_source
OEM-2-RPRC solenoid (fuel pressure regulator)low_side_outMS3PROEVO-C-2PWM out 4low_side_outsingle_source
OEM-2-SCondenser fan relaylow_side_outMS3PROEVO-C-4Digital out 1low_side_outsingle_source
OEM-2-TFuel pump relaylow_side_outMS3PROEVO-A-29PWM out 2low_side_outsingle_source
OEM-2-UInjector 1injector_outMS3PROEVO-A-3Injector out Jinjector_outsingle_source
OEM-2-VInjector 2injector_outMS3PROEVO-A-4Injector out Iinjector_outsingle_source
OEM-2-WISC solenoidlow_side_outMS3PROEVO-C-3Digital out 2low_side_outsingle_source
OEM-2-XEvap purge solenoidlow_side_outMS3PROEVO-C-1PWM out 5low_side_outsingle_source
OEM-2-YInjector 3injector_outMS3PROEVO-B-1Injector out Ainjector_outsingle_source
OEM-2-ZInjector 4injector_outMS3PROEVO-B-10Injector out Finjector_outsingle_source

Cut list

WireFromToGauge (mm²)ColourLengthSignalIdent
W1OEM-1-BSP-14V-10.85no routeECU power +14V (main relay)—
W2SP-14V-1MS3PROEVO-A-350.85no route12V+ switched power in—
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-1MS3PROEVO-B-30.85no routeGround—
W8SP-GND-1MS3PROEVO-B-50.85no routeGround—
W9SP-GND-1MS3PROEVO-B-70.85no routeGround—
W10SP-GND-1MS3PROEVO-B-90.85no routeGround—
W11OEM-2-FSP-0V-10.5no routeMAF ground—
W12SP-0V-1MS3PROEVO-A-130.5no routeLogic Ground—
W13SP-0V-1MS3PROEVO-A-180.5no routeSensor return—
W14SP-0V-1MS3PROEVO-C-170.5no routeSensor return—
W15SP-0V-1MS3PROEVO-C-180.5no routeSensor return—
W16SP-0V-1MS3PROEVO-C-190.5no routeSensor return—
W17SP-0V-1MS3PROEVO-C-200.5no routeSensor return—
W18SP-0V-1MS3PROEVO-C-210.5no routeSensor return—
W19OEM-2-KMS3PROEVO-A-80.5no route+5V sensor supply—
W20OEM-2-EMS3PROEVO-A-60.5no routeCrank position (CAS NE)—
W21SP-0V-1MS3PROEVO-A-150.5no routeCKP−—
W22OEM-2-GMS3PROEVO-A-260.5no routeCam position (CAS G)—
W23SP-0V-1MS3PROEVO-A-270.5no routeCMP−—
W24OEM-1-GMS3PROEVO-B-130.5no routeIgnition 1 (coils 1+4, wasted spark)—
W25OEM-1-HMS3PROEVO-B-140.5no routeIgnition 2 (coils 2+3, wasted spark)—
W26OEM-2-UMS3PROEVO-A-30.5no routeInjector 1—
W27OEM-2-VMS3PROEVO-A-40.5no routeInjector 2—
W28OEM-2-YMS3PROEVO-B-10.5no routeInjector 3—
W29OEM-2-ZMS3PROEVO-B-100.5no routeInjector 4—
W30OEM-1-JMS3PROEVO-A-280.5no routeA/C relay—
W31OEM-1-RMS3PROEVO-A-140.5no routeCooling fan relay—
W32OEM-2-SMS3PROEVO-C-40.5no routeCondenser fan relay—
W33OEM-2-TMS3PROEVO-A-290.5no routeFuel pump relay—
W34OEM-2-WMS3PROEVO-C-30.5no routeISC solenoid—
W35OEM-1-EMS3PROEVO-A-300.5no routeMalfunction indicator lamp (MIL)—
W36OEM-2-RMS3PROEVO-C-20.5no routePRC solenoid (fuel pressure regulator)—
W37OEM-2-XMS3PROEVO-C-10.5no routeEvap purge solenoid—
W38OEM-2-IMS3PROEVO-A-240.5no routeTachometer output—
W39OEM-2-OMS3PROEVO-A-190.5no routeMass air flow (MAF)—
W40OEM-2-MMS3PROEVO-A-90.5no routeThrottle position (TPS)—
W41OEM-2-NMS3PROEVO-A-250.5no routeO2 sensor—
W42OEM-2-QMS3PROEVO-A-100.5no routeCoolant temperature (ECT)—
W43OEM-2-PMS3PROEVO-A-110.5no routeIntake air temperature (IAT)—
W44OEM-1-MMS3PROEVO-B-280.5no routeVehicle speed—
W45OEM-1-CMS3PROEVO-A-320.5no routeStart signal—
W46OEM-1-PMS3PROEVO-B-200.5no routePower steering pressure switch—
W47OEM-1-QMS3PROEVO-B-290.5no routeA/C request—
W48OEM-1-VMS3PROEVO-C-110.5no routeNeutral/clutch switch—

Bill of materials

CategoryPart numberManufacturerDescriptionQtyUnit

ECU setup sheet

RoleEngine refEngine signalSensorECU pointECU functionECU classSetup flag
No configured channels.

Findings

Open (1)

SeverityCodeSubjectMessage
infoNET_FAMILYMS3PROEVO-A-18 ↔ MS3PROEVO-A-27MS3PROEVO-A-18 "Sensor return" [sensor_ground] is wired to MS3PROEVO-A-27 "CMP−" [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: AMP EFI MS3Pro EVO+ has no battery-constant input; not needed - MS3PROEVO-B 19: Digital switched 12V in: not fed (the stock ECU has no ignition-sense pin); feed it from a switched-ignition source

Sources

ReliabilityKindTitleURL
4vendor_docAMP EFI: MS3Pro EVO+ / EVO+ HC manual (fw 1.6.1) pinout tableshttps://cdn.shopify.com/s/files/1/0960/0014/7754/files/MS3Pro_User_Manual_Firmware_1.6.1_EVO.pdf?v=1760643022
4vendor_docLink G4X MX5X install manual (NA 1.6/1.8)https://linkecu.com/documentation/MX5X.pdf