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MX-5 Miata NA6 1990-93 (B6-ZE, 1.6) → MaxxECU MaxxECU MINI REV10+ (auto)

MX-5 Miata NA6 1990-93 (B6-ZE, 1.6) — MaxxECU — MaxxECU MINI
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-08

Before you start

Statusdraft · not yet verified: nobody has reported building and running this harness
Open errors1: read the Findings page before cutting any wire
Size of the job28 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-1MAXXECUMINI-C1-H40.85☐☐☐☐☐☐☐
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-1MAXXECUMINI-C1-G40.85☐☐☐☐☐☐☐
W8OEM-2-FSP-0V-10.5☐☐☐☐☐☐☐
W9SP-0V-1MAXXECUMINI-C1-A20.5☐☐☐☐☐☐☐
W10SP-0V-1MAXXECUMINI-C1-B30.5☐☐☐☐☐☐☐
W11SP-0V-1MAXXECUMINI-C1-B40.5☐☐☐☐☐☐☐
W12SP-0V-1MAXXECUMINI-C1-D40.5☐☐☐☐☐☐☐
W13OEM-2-KMAXXECUMINI-C1-E20.5☐☐☐☐☐☐☐
W14OEM-2-EMAXXECUMINI-C1-A10.5☐☐☐☐☐☐☐
W15OEM-1-GMAXXECUMINI-C1-F10.5☐☐☐☐☐☐☐
W16OEM-1-HMAXXECUMINI-C1-F20.5☐☐☐☐☐☐☐
W17OEM-2-UMAXXECUMINI-C1-G30.5☐☐☐☐☐☐☐
W18OEM-2-VMAXXECUMINI-C1-H10.5☐☐☐☐☐☐☐
W19OEM-2-YMAXXECUMINI-C1-H20.5☐☐☐☐☐☐☐
W20OEM-2-ZMAXXECUMINI-C1-H30.5☐☐☐☐☐☐☐
W21OEM-1-EMAXXECUMINI-C1-G20.5☐☐☐☐☐☐☐
W22OEM-2-IMAXXECUMINI-C1-G10.5☐☐☐☐☐☐☐
W23OEM-2-OMAXXECUMINI-C1-C30.5☐☐☐☐☐☐☐
W24OEM-2-NMAXXECUMINI-C1-C40.5☐☐☐☐☐☐☐
W25OEM-2-QMAXXECUMINI-C1-C10.5☐☐☐☐☐☐☐
W26OEM-2-PMAXXECUMINI-C1-C20.5☐☐☐☐☐☐☐
W27OEM-1-CMAXXECUMINI-C1-B10.5☐☐☐☐☐☐☐
W28OEM-1-NMAXXECUMINI-C1-B20.5☐☐☐☐☐☐☐

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
1MAXXECUMINI-C1-H4MAXXECUMINI-C1-A2open (OL)+12 V supply must not touch sensor ground
2MAXXECUMINI-C1-H4MAXXECUMINI-C1-G4open (OL)+12 V supply must not touch power ground
3MAXXECUMINI-C1-A2MAXXECUMINI-C1-E2open (OL)sensor ground must not touch 5 V sensor reference
4MAXXECUMINI-C1-G4MAXXECUMINI-C1-E2open (OL)power ground must not touch 5 V sensor reference
5MAXXECUMINI-C1-H4MAXXECUMINI-C1-E2open (OL)+12 V supply must not touch 5 V sensor reference

Revisions

RevLabelByDate
No revisions yet.

Schematic

MAXXECUMINI-C1OEM-1OEM-2SP-0VSP-14VSP-GND

Connectors

MAXXECUMINI-C1

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
A1TRIGGER—W14—0.5OEM-2-E———
A2TRIGGER GND—W9—0.5SP-0V-1———
B1DIN 1 (Hall only)—W27—0.5OEM-1-C———
B2DIN 2 (Hall only)—W28—0.5OEM-1-N———
B3SENSOR GND—W10—0.5SP-0V-1———
B4SENSOR GND—W11—0.5SP-0V-1———
C1CLT—W25—0.5OEM-2-Q———
C2IAT—W26—0.5OEM-2-P———
C3AIN 3 (0-5V)—W23—0.5OEM-2-O———
C4AIN 4 (0-5V)—W24—0.5OEM-2-N———
D1GPO 8/TACHO————————
D2TPS————————
D3GND Shield————————
D4SENSOR GND—W12—0.5SP-0V-1———
E1GPO 3————————
E2+5V sensor supply—W13—0.5OEM-2-K———
E3CAN L————————
E4CAN H————————
F1IGN 1—W15—0.5OEM-1-G———
F2IGN 2—W16—0.5OEM-1-H———
F3IGN 3————————
F4IGN 4————————
G1GPO 2—W22—0.5OEM-2-I———
G2GPO 1—W21—0.5OEM-1-E———
G3INJ 1—W17—0.5OEM-2-U———
G4ENGINE GND—W7—0.85SP-GND-1———
H1INJ 2—W18—0.5OEM-2-V———
H2INJ 3—W19—0.5OEM-2-Y———
H3INJ 4—W20—0.5OEM-2-Z———
H4+12V (ECU power supply)—W2—0.85SP-14V-1———

OEM-1

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
AConstant +12V————————
BECU power +14V (main relay)—W1—0.85SP-14V-1———
CStart signal—W27—0.5MAXXECUMINI-C1-B1———
EMalfunction indicator lamp (MIL)—W21—0.5MAXXECUMINI-C1-G2———
GIgnition 1 (coils 1+4, wasted spark)—W15—0.5MAXXECUMINI-C1-F1———
HIgnition 2 (coils 2+3, wasted spark)—W16—0.5MAXXECUMINI-C1-F2———
NWide-open throttle switch—W28—0.5MAXXECUMINI-C1-B2———
PPower steering pressure switch————————
QA/C request————————
VNeutral/clutch switch————————

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)—W14—0.5MAXXECUMINI-C1-A1———
FAFM ground—W8—0.5SP-0V-1———
GCam position (CAS G)————————
ITachometer output—W22—0.5MAXXECUMINI-C1-G1———
K+5V sensor supply—W13—0.5MAXXECUMINI-C1-E2———
LIdle switch (TPS)————————
NO2 sensor—W24—0.5MAXXECUMINI-C1-C4———
OAir flow meter (AFM)—W23—0.5MAXXECUMINI-C1-C3———
PIntake air temperature (IAT)—W26—0.5MAXXECUMINI-C1-C2———
QCoolant temperature (ECT)—W25—0.5MAXXECUMINI-C1-C1———
UInjector 1—W17—0.5MAXXECUMINI-C1-G3———
VInjector 2—W18—0.5MAXXECUMINI-C1-H1———
YInjector 3—W19—0.5MAXXECUMINI-C1-H2———
ZInjector 4—W20—0.5MAXXECUMINI-C1-H3———

SP-0V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W8—0.5OEM-2-F———
1——W9—0.5MAXXECUMINI-C1-A2———
1——W10—0.5MAXXECUMINI-C1-B3———
1——W11—0.5MAXXECUMINI-C1-B4———
1——W12—0.5MAXXECUMINI-C1-D4———

SP-14V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W1—0.85OEM-1-B———
1——W2—0.85MAXXECUMINI-C1-H4———

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—0.85MAXXECUMINI-C1-G4———

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_inMAXXECUMINI-C1-H4+12V (ECU power supply)power_insingle_source
OEM-1-CStart signaldigital_inMAXXECUMINI-C1-B1DIN 1 (Hall only)digital_insingle_source
OEM-1-EMalfunction indicator lamp (MIL)low_side_outMAXXECUMINI-C1-G2GPO 1low_side_outsingle_source
OEM-1-GIgnition 1 (coils 1+4, wasted spark)ignition_outMAXXECUMINI-C1-F1IGN 1ignition_outsingle_source
OEM-1-HIgnition 2 (coils 2+3, wasted spark)ignition_outMAXXECUMINI-C1-F2IGN 2ignition_outsingle_source
OEM-1-NWide-open throttle switchdigital_inMAXXECUMINI-C1-B2DIN 2 (Hall only)digital_insingle_source
OEM-1-PPower steering pressure switchdigital_in———single_source
OEM-1-QA/C requestdigital_in———single_source
OEM-1-VNeutral/clutch switchdigital_in———single_source
OEM-2-APower groundgroundMAXXECUMINI-C1-G4ENGINE GNDgroundsingle_source
OEM-2-BPower groundgroundMAXXECUMINI-C1-G4ENGINE GNDgroundsingle_source
OEM-2-CPower groundgroundMAXXECUMINI-C1-G4ENGINE GNDgroundsingle_source
OEM-2-DPower groundgroundMAXXECUMINI-C1-G4ENGINE GNDgroundsingle_source
OEM-2-ECrank position (CAS NE)trigger_inMAXXECUMINI-C1-A1TRIGGERtrigger_insingle_source
OEM-2-FAFM groundsensor_groundMAXXECUMINI-C1-A2 + MAXXECUMINI-C1-B3 + MAXXECUMINI-C1-B4 + MAXXECUMINI-C1-D4TRIGGER GND + SENSOR GND + SENSOR GND + SENSOR GNDsensor_groundsingle_source
OEM-2-GCam position (CAS G)trigger_in———single_source
OEM-2-ITachometer outputtacho_outMAXXECUMINI-C1-G1GPO 2low_side_outsingle_source
OEM-2-K+5V sensor supplyvrefMAXXECUMINI-C1-E2+5V sensor supplyvrefsingle_source
OEM-2-LIdle switch (TPS)digital_in———single_source
OEM-2-NO2 sensorlambda_nb_inMAXXECUMINI-C1-C4AIN 4 (0-5V)analog_insingle_source
OEM-2-OAir flow meter (AFM)analog_inMAXXECUMINI-C1-C3AIN 3 (0-5V)analog_insingle_source
OEM-2-PIntake air temperature (IAT)temp_inMAXXECUMINI-C1-C2IATtemp_insingle_source
OEM-2-QCoolant temperature (ECT)temp_inMAXXECUMINI-C1-C1CLTtemp_insingle_source
OEM-2-UInjector 1injector_outMAXXECUMINI-C1-G3INJ 1injector_outsingle_source
OEM-2-VInjector 2injector_outMAXXECUMINI-C1-H1INJ 2injector_outsingle_source
OEM-2-YInjector 3injector_outMAXXECUMINI-C1-H2INJ 3injector_outsingle_source
OEM-2-ZInjector 4injector_outMAXXECUMINI-C1-H3INJ 4injector_outsingle_source

Cut list

WireFromToGauge (mm²)ColourLengthSignalIdent
W1OEM-1-BSP-14V-10.85no routeECU power +14V (main relay)—
W2SP-14V-1MAXXECUMINI-C1-H40.85no route+12V (ECU power supply)—
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-1MAXXECUMINI-C1-G40.85no routeENGINE GND—
W8OEM-2-FSP-0V-10.5no routeAFM ground—
W9SP-0V-1MAXXECUMINI-C1-A20.5no routeTRIGGER GND—
W10SP-0V-1MAXXECUMINI-C1-B30.5no routeSENSOR GND—
W11SP-0V-1MAXXECUMINI-C1-B40.5no routeSENSOR GND—
W12SP-0V-1MAXXECUMINI-C1-D40.5no routeSENSOR GND—
W13OEM-2-KMAXXECUMINI-C1-E20.5no route+5V sensor supply—
W14OEM-2-EMAXXECUMINI-C1-A10.5no routeCrank position (CAS NE)—
W15OEM-1-GMAXXECUMINI-C1-F10.5no routeIgnition 1 (coils 1+4, wasted spark)—
W16OEM-1-HMAXXECUMINI-C1-F20.5no routeIgnition 2 (coils 2+3, wasted spark)—
W17OEM-2-UMAXXECUMINI-C1-G30.5no routeInjector 1—
W18OEM-2-VMAXXECUMINI-C1-H10.5no routeInjector 2—
W19OEM-2-YMAXXECUMINI-C1-H20.5no routeInjector 3—
W20OEM-2-ZMAXXECUMINI-C1-H30.5no routeInjector 4—
W21OEM-1-EMAXXECUMINI-C1-G20.5no routeMalfunction indicator lamp (MIL)—
W22OEM-2-IMAXXECUMINI-C1-G10.5no routeTachometer output—
W23OEM-2-OMAXXECUMINI-C1-C30.5no routeAir flow meter (AFM)—
W24OEM-2-NMAXXECUMINI-C1-C40.5no routeO2 sensor—
W25OEM-2-QMAXXECUMINI-C1-C10.5no routeCoolant temperature (ECT)—
W26OEM-2-PMAXXECUMINI-C1-C20.5no routeIntake air temperature (IAT)—
W27OEM-1-CMAXXECUMINI-C1-B10.5no routeStart signal—
W28OEM-1-NMAXXECUMINI-C1-B20.5no routeWide-open throttle 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
errorREQUIRED_UNMAPPEDOEM-2-GRequired OEM function "Cam position (CAS G)" (trigger_in) is not connected to the new ECU.
infoNET_FAMILYOEM-2-I ↔ MAXXECUMINI-C1-G1OEM-2-I "Tachometer output" [tacho_out] is wired to MAXXECUMINI-C1-G1 "GPO 2" [low_side_out]. Tacho as a low-side output: check the tach needs a pull-up.
infoUNMAPPEDOEM4 optional OEM pins are not mapped: OEM-1-P Power steering pressure switch; OEM-1-Q A/C request; OEM-1-V Neutral/clutch switch; 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. Open items: - OEM-2 G: Cam position (CAS G): no free cam_hall/cam_vr/frequency_in input on MaxxECU MaxxECU MINI Not wired: - OEM-1 A: Constant +12V: MaxxECU MaxxECU MINI has no battery-constant input; not needed - OEM-1 P: Power steering pressure switch: no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU MINI - OEM-1 Q: A/C request: no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU MINI - OEM-1 V: Neutral/clutch switch: no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU MINI - OEM-2 L: Idle switch (TPS): no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU MINI

Sources

ReliabilityKindTitleURLArchiveCapturedSHA-256
4vendor_docLink G4X MX5X install manual (NA 1.6/1.8)https://linkecu.com/documentation/MX5X.pdfarchive2026-10-05b7f730de9f6e
4vendor_docMaxxECU GEN1 pinout (MINI / STREET / SPORT / V1 / RACE / PRO)http://www.maxxecu.com/webhelp/wirings-maxxecu_pinout.htmlarchive2026-10-052e37b6814690