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MX-5 Miata NA6 1990-93 (B6-ZE, 1.6) → AMP EFI MS3Pro Mini (auto)

MX-5 Miata NA6 1990-93 (B6-ZE, 1.6) — AMP EFI — MS3Pro Mini
Drawn by Michael Gnankou · Rev 0 · proposal · 2026-10-08

Before you start

Statusproposal · not yet verified: nobody has reported building and running this harness
Open errorsnone
Size of the job29 wires · 6 connectors · 2 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-1-BSP-14V-10.85☐☐☐☐☐☐☐
W2SP-14V-1MS3PROMINI-A-10.85☐☐☐☐☐☐☐
W3OEM-2-ASP-GND-10.85☐☐☐☐☐☐☐
W4OEM-2-BSP-GND-10.85☐☐☐☐☐☐☐
W5OEM-2-CSP-GND-10.85☐☐☐☐☐☐☐
W6OEM-2-DSP-GND-10.85☐☐☐☐☐☐☐
W7SP-GND-1MS3PROMINI-A-220.85☐☐☐☐☐☐☐
W8SP-GND-1MS3PROMINI-A-230.85☐☐☐☐☐☐☐
W9OEM-2-FSP-0V-10.5☐☐☐☐☐☐☐
W10SP-0V-1MS3PROMINI-A-210.5☐☐☐☐☐☐☐
W11OEM-2-KMS3PROMINI-A-20.5☐☐☐☐☐☐☐
W12OEM-2-EMS3PROMINI-A-300.5☐☐☐☐☐☐☐
W13OEM-2-GMS3PROMINI-A-320.5☐☐☐☐☐☐☐
W14OEM-1-GMS3PROMINI-A-170.5☐☐☐☐☐☐☐
W15OEM-1-HMS3PROMINI-A-180.5☐☐☐☐☐☐☐
W16OEM-2-UMS3PROMINI-A-100.5☐☐☐☐☐☐☐
W17OEM-2-VMS3PROMINI-A-110.5☐☐☐☐☐☐☐
W18OEM-2-YMS3PROMINI-A-120.5☐☐☐☐☐☐☐
W19OEM-2-ZMS3PROMINI-A-50.5☐☐☐☐☐☐☐
W20OEM-1-EMS3PROMINI-A-30.5☐☐☐☐☐☐☐
W21OEM-2-OMS3PROMINI-A-130.5☐☐☐☐☐☐☐
W22OEM-2-NMS3PROMINI-A-140.5☐☐☐☐☐☐☐
W23OEM-2-QMS3PROMINI-A-260.5☐☐☐☐☐☐☐
W24OEM-2-PMS3PROMINI-A-270.5☐☐☐☐☐☐☐
W25OEM-1-CMS3PROMINI-A-290.5☐☐☐☐☐☐☐
W26OEM-1-NMS3PROMINI-A-340.5☐☐☐☐☐☐☐
W27OEM-1-PMS3PROMINI-A-350.5☐☐☐☐☐☐☐
W28OEM-1-QMS3PROMINI-A-150.5☐☐☐☐☐☐☐
W29OEM-1-VMS3PROMINI-A-160.5☐☐☐☐☐☐☐

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
1MS3PROMINI-A-1MS3PROMINI-A-21open (OL)+12 V supply must not touch sensor ground
2MS3PROMINI-A-1MS3PROMINI-A-22open (OL)+12 V supply must not touch power ground
3MS3PROMINI-A-1MS3PROMINI-A-2open (OL)+12 V supply must not touch 5 V sensor reference
4MS3PROMINI-A-21MS3PROMINI-A-2open (OL)sensor ground must not touch 5 V sensor reference
5MS3PROMINI-A-22MS3PROMINI-A-2open (OL)power ground must not touch 5 V sensor reference

Revisions

RevLabelByDate
No revisions yet.

Schematic

MS3PROMINI-AOEM-1OEM-2SP-0VSP-14VSP-GND

Connectors

MS3PROMINI-A

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
112V+ switched power in—W2—0.85SP-14V-1———
10Injector out F—W16—0.5OEM-2-U———
11Injector out G—W17—0.5OEM-2-V———
12Injector out H—W18—0.5OEM-2-Y———
13Analog in 1—W21—0.5OEM-2-O———
14Analog in 2—W22—0.5OEM-2-N———
15Analog in 3—W28—0.5OEM-1-Q———
16Analog in 4—W29—0.5OEM-1-V———
17Spark out A—W14—0.5OEM-1-G———
18Spark out B—W15—0.5OEM-1-H———
19Spark out C————————
2+5V VREF out—W11—0.5OEM-2-K———
20Spark out D————————
21Sensor ground—W10—0.5SP-0V-1———
22Power ground—W7—0.85SP-GND-1———
23Power ground—W8—0.85SP-GND-1———
24CAN Low————————
25CAN High————————
26CLT in—W23—0.5OEM-2-Q———
27IAT in—W24—0.5OEM-2-P———
28TPS in————————
29Digital switched in 1 / Flex fuel—W25—0.5OEM-1-C———
3PWM out 1 / Idle—W20—0.5OEM-1-E———
30CKP+—W12—0.5OEM-2-E———
31CKP-————————
32CMP+—W13—0.5OEM-2-G———
33CMP-————————
34Digital frequency in 1 (Hall)—W26—0.5OEM-1-N———
35Digital frequency in 2 (Hall)—W27—0.5OEM-1-P———
4Fuel pump out————————
5Injector out A—W19—0.5OEM-2-Z———
6Injector out B————————
7Injector out C————————
8Injector out D————————
9Injector out E————————

OEM-1

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
AConstant +12V————————
BECU power +14V (main relay)—W1—0.85SP-14V-1———
CStart signal—W25—0.5MS3PROMINI-A-29———
EMalfunction indicator lamp (MIL)—W20—0.5MS3PROMINI-A-3———
GIgnition 1 (coils 1+4, wasted spark)—W14—0.5MS3PROMINI-A-17———
HIgnition 2 (coils 2+3, wasted spark)—W15—0.5MS3PROMINI-A-18———
NWide-open throttle switch—W26—0.5MS3PROMINI-A-34———
PPower steering pressure switch—W27—0.5MS3PROMINI-A-35———
QA/C request—W28—0.5MS3PROMINI-A-15———
VNeutral/clutch switch—W29—0.5MS3PROMINI-A-16———

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)—W12—0.5MS3PROMINI-A-30———
FAFM ground—W9—0.5SP-0V-1———
GCam position (CAS G)—W13—0.5MS3PROMINI-A-32———
ITachometer output————————
K+5V sensor supply—W11—0.5MS3PROMINI-A-2———
LIdle switch (TPS)————————
NO2 sensor—W22—0.5MS3PROMINI-A-14———
OAir flow meter (AFM)—W21—0.5MS3PROMINI-A-13———
PIntake air temperature (IAT)—W24—0.5MS3PROMINI-A-27———
QCoolant temperature (ECT)—W23—0.5MS3PROMINI-A-26———
UInjector 1—W16—0.5MS3PROMINI-A-10———
VInjector 2—W17—0.5MS3PROMINI-A-11———
YInjector 3—W18—0.5MS3PROMINI-A-12———
ZInjector 4—W19—0.5MS3PROMINI-A-5———

SP-0V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W9—0.5OEM-2-F———
1——W10—0.5MS3PROMINI-A-21———

SP-14V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W1—0.85OEM-1-B———
1——W2—0.85MS3PROMINI-A-1———

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—0.85MS3PROMINI-A-22———
1——W8—0.85MS3PROMINI-A-23———

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_inMS3PROMINI-A-112V+ switched power inpower_insingle_source
OEM-1-CStart signaldigital_inMS3PROMINI-A-29Digital switched in 1 / Flex fueldigital_insingle_source
OEM-1-EMalfunction indicator lamp (MIL)low_side_outMS3PROMINI-A-3PWM out 1 / Idlelow_side_outsingle_source
OEM-1-GIgnition 1 (coils 1+4, wasted spark)ignition_outMS3PROMINI-A-17Spark out Aignition_outsingle_source
OEM-1-HIgnition 2 (coils 2+3, wasted spark)ignition_outMS3PROMINI-A-18Spark out Bignition_outsingle_source
OEM-1-NWide-open throttle switchdigital_inMS3PROMINI-A-34Digital frequency in 1 (Hall)digital_insingle_source
OEM-1-PPower steering pressure switchdigital_inMS3PROMINI-A-35Digital frequency in 2 (Hall)digital_insingle_source
OEM-1-QA/C requestdigital_inMS3PROMINI-A-15Analog in 3analog_insingle_source
OEM-1-VNeutral/clutch switchdigital_inMS3PROMINI-A-16Analog in 4analog_insingle_source
OEM-2-APower groundgroundMS3PROMINI-A-22 + MS3PROMINI-A-23Power ground + Power groundgroundsingle_source
OEM-2-BPower groundgroundMS3PROMINI-A-22 + MS3PROMINI-A-23Power ground + Power groundgroundsingle_source
OEM-2-CPower groundgroundMS3PROMINI-A-22 + MS3PROMINI-A-23Power ground + Power groundgroundsingle_source
OEM-2-DPower groundgroundMS3PROMINI-A-22 + MS3PROMINI-A-23Power ground + Power groundgroundsingle_source
OEM-2-ECrank position (CAS NE)trigger_inMS3PROMINI-A-30CKP+trigger_insingle_source
OEM-2-FAFM groundsensor_groundMS3PROMINI-A-21Sensor groundsensor_groundsingle_source
OEM-2-GCam position (CAS G)trigger_inMS3PROMINI-A-32CMP+trigger_insingle_source
OEM-2-ITachometer outputtacho_out———single_source
OEM-2-K+5V sensor supplyvrefMS3PROMINI-A-2+5V VREF outvrefsingle_source
OEM-2-LIdle switch (TPS)digital_in———single_source
OEM-2-NO2 sensorlambda_nb_inMS3PROMINI-A-14Analog in 2analog_insingle_source
OEM-2-OAir flow meter (AFM)analog_inMS3PROMINI-A-13Analog in 1analog_insingle_source
OEM-2-PIntake air temperature (IAT)temp_inMS3PROMINI-A-27IAT intemp_insingle_source
OEM-2-QCoolant temperature (ECT)temp_inMS3PROMINI-A-26CLT intemp_insingle_source
OEM-2-UInjector 1injector_outMS3PROMINI-A-10Injector out Finjector_outsingle_source
OEM-2-VInjector 2injector_outMS3PROMINI-A-11Injector out Ginjector_outsingle_source
OEM-2-YInjector 3injector_outMS3PROMINI-A-12Injector out Hinjector_outsingle_source
OEM-2-ZInjector 4injector_outMS3PROMINI-A-5Injector out Ainjector_outsingle_source

Cut list

WireFromToGauge (mm²)ColourLengthSignalIdent
W1OEM-1-BSP-14V-10.85no routeECU power +14V (main relay)—
W2SP-14V-1MS3PROMINI-A-10.85no 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-1MS3PROMINI-A-220.85no routePower ground—
W8SP-GND-1MS3PROMINI-A-230.85no routePower ground—
W9OEM-2-FSP-0V-10.5no routeAFM ground—
W10SP-0V-1MS3PROMINI-A-210.5no routeSensor ground—
W11OEM-2-KMS3PROMINI-A-20.5no route+5V sensor supply—
W12OEM-2-EMS3PROMINI-A-300.5no routeCrank position (CAS NE)—
W13OEM-2-GMS3PROMINI-A-320.5no routeCam position (CAS G)—
W14OEM-1-GMS3PROMINI-A-170.5no routeIgnition 1 (coils 1+4, wasted spark)—
W15OEM-1-HMS3PROMINI-A-180.5no routeIgnition 2 (coils 2+3, wasted spark)—
W16OEM-2-UMS3PROMINI-A-100.5no routeInjector 1—
W17OEM-2-VMS3PROMINI-A-110.5no routeInjector 2—
W18OEM-2-YMS3PROMINI-A-120.5no routeInjector 3—
W19OEM-2-ZMS3PROMINI-A-50.5no routeInjector 4—
W20OEM-1-EMS3PROMINI-A-30.5no routeMalfunction indicator lamp (MIL)—
W21OEM-2-OMS3PROMINI-A-130.5no routeAir flow meter (AFM)—
W22OEM-2-NMS3PROMINI-A-140.5no routeO2 sensor—
W23OEM-2-QMS3PROMINI-A-260.5no routeCoolant temperature (ECT)—
W24OEM-2-PMS3PROMINI-A-270.5no routeIntake air temperature (IAT)—
W25OEM-1-CMS3PROMINI-A-290.5no routeStart signal—
W26OEM-1-NMS3PROMINI-A-340.5no routeWide-open throttle switch—
W27OEM-1-PMS3PROMINI-A-350.5no routePower steering pressure switch—
W28OEM-1-QMS3PROMINI-A-150.5no routeA/C request—
W29OEM-1-VMS3PROMINI-A-160.5no routeNeutral/clutch switch—

Bill of materials

CategoryPart numberManufacturerDescriptionQtyUnit
connector174515-6TEAMP Multilock .040/.070 hybrid 22-pin female harness plug (Miata NA/NB ECU)1.000ea
connector174516-6TEAMP Multilock .040/.070 hybrid 26-pin female harness plug (Miata NA/NB ECU)1.000ea

ECU setup sheet

RoleEngine refEngine signalSensorECU pointECU functionECU classSetup flag
No configured channels.

Findings

Open (3)

SeverityCodeSubjectMessage
warnNET_FAMILYOEM-1-Q ↔ MS3PROMINI-A-15OEM-1-Q "A/C request" [digital_in] is wired to MS3PROMINI-A-15 "Analog in 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.
warnNET_FAMILYOEM-1-V ↔ MS3PROMINI-A-16OEM-1-V "Neutral/clutch switch" [digital_in] is wired to MS3PROMINI-A-16 "Analog in 4" [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.
infoUNMAPPEDOEM2 optional OEM pins are not mapped: OEM-2-I Tachometer output; OEM-2-L Idle switch (TPS)

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 2026-10-06. Review every wire against both manuals before building. Not wired: - OEM-1 A: Constant +12V: AMP EFI MS3Pro Mini has no battery-constant input; not needed - OEM-2 I: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on AMP EFI MS3Pro Mini - OEM-2 L: Idle switch (TPS): no free switch_in/frequency_in/analog_0_5 on AMP EFI MS3Pro Mini

Sources

ReliabilityKindTitleURLArchiveCapturedSHA-256
4vendor_docAMP EFI: MS3Pro Mini manual (fw 1.6.1) pinout & output ratingshttps://cdn.shopify.com/s/files/1/0960/0014/7754/files/MS3Pro_User_Manual_Firmware_1.6.1_Mini.pdf?v=1760643335archive2026-10-05bed7d8ae8408
4vendor_docLink G4X MX5X install manual (NA 1.6/1.8)https://linkecu.com/documentation/MX5X.pdfarchive2026-10-05b7f730de9f6e