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MX-5 Miata NA8 1994-97 (BP-ZE, 1.8) → Link G4X AtomX 111-4000 (auto)

MX-5 Miata NA8 1994-97 (BP-ZE, 1.8) — Link — G4X AtomX
⚠ 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 errorsnone
Size of the job30 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-1G4XATOMX-A-A50.85☐☐☐☐☐☐☐
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-1G4XATOMX-A-A250.85☐☐☐☐☐☐☐
W8SP-GND-1G4XATOMX-A-A340.85☐☐☐☐☐☐☐
W9OEM-2-FSP-0V-10.5☐☐☐☐☐☐☐
W10SP-0V-1G4XATOMX-A-A240.5☐☐☐☐☐☐☐
W11OEM-2-KG4XATOMX-A-A320.5☐☐☐☐☐☐☐
W12OEM-2-EG4XATOMX-A-A80.5☐☐☐☐☐☐☐
W13OEM-2-GG4XATOMX-A-A90.5☐☐☐☐☐☐☐
W14OEM-1-GG4XATOMX-A-A130.5☐☐☐☐☐☐☐
W15OEM-1-HG4XATOMX-A-A120.5☐☐☐☐☐☐☐
W16OEM-2-UG4XATOMX-A-A40.5☐☐☐☐☐☐☐
W17OEM-2-VG4XATOMX-A-A30.5☐☐☐☐☐☐☐
W18OEM-2-YG4XATOMX-A-A20.5☐☐☐☐☐☐☐
W19OEM-2-ZG4XATOMX-A-A10.5☐☐☐☐☐☐☐
W20OEM-1-JG4XATOMX-A-A210.5☐☐☐☐☐☐☐
W21OEM-1-RG4XATOMX-A-A200.5☐☐☐☐☐☐☐
W22OEM-2-SG4XATOMX-A-A190.5☐☐☐☐☐☐☐
W23OEM-2-TG4XATOMX-A-A180.5☐☐☐☐☐☐☐
W24OEM-2-OG4XATOMX-A-A170.5☐☐☐☐☐☐☐
W25OEM-2-MG4XATOMX-A-A220.5☐☐☐☐☐☐☐
W26OEM-2-NG4XATOMX-A-A330.5☐☐☐☐☐☐☐
W27OEM-2-QG4XATOMX-A-A150.5☐☐☐☐☐☐☐
W28OEM-2-PG4XATOMX-A-A160.5☐☐☐☐☐☐☐
W29OEM-1-MG4XATOMX-A-A300.5☐☐☐☐☐☐☐
W30OEM-1-CG4XATOMX-A-A310.5☐☐☐☐☐☐☐

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
1G4XATOMX-A-A5G4XATOMX-A-A24open (OL)+12 V supply must not touch sensor ground
2G4XATOMX-A-A5G4XATOMX-A-A25open (OL)+12 V supply must not touch power ground
3G4XATOMX-A-A24G4XATOMX-A-A32open (OL)sensor ground must not touch 5 V sensor reference
4G4XATOMX-A-A25G4XATOMX-A-A32open (OL)power ground must not touch 5 V sensor reference
5G4XATOMX-A-A5G4XATOMX-A-A32open (OL)+12 V supply must not touch 5 V sensor reference

Revisions

RevLabelByDate
No revisions yet.

Schematic

G4XATOMX-AOEM-1OEM-2SP-0VSP-14VSP-GND

Connectors

G4XATOMX-A

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
A1Injector 4—W19—0.5OEM-2-Z———
A10Ignition 4————————
A11Ignition 3————————
A12Ignition 2—W15—0.5OEM-1-H———
A13Ignition 1—W14—0.5OEM-1-G———
A15Analog Temp 1—W27—0.5OEM-2-Q———
A16Analog Temp 2—W28—0.5OEM-2-P———
A17Analog Volt 1—W24—0.5OEM-2-O———
A18Aux 4—W23—0.5OEM-2-T———
A19Aux 3—W22—0.5OEM-2-S———
A2Injector 3—W18—0.5OEM-2-Y———
A20Aux 2—W21—0.5OEM-1-R———
A21Aux 1—W20—0.5OEM-1-J———
A22Analog Volt 2—W25—0.5OEM-2-M———
A24Sensor Ground—W10—0.5SP-0V-1———
A25System Ground—W7—0.85SP-GND-1———
A28CAN H————————
A29CAN L————————
A3Injector 2—W17—0.5OEM-2-V———
A30Digital Input 1—W29—0.5OEM-1-M———
A31Digital Input 2—W30—0.5OEM-1-C———
A32+5V Out—W11—0.5OEM-2-K———
A33Analog Volt 3—W26—0.5OEM-2-N———
A34System Ground—W8—0.85SP-GND-1———
A4Injector 1—W16—0.5OEM-2-U———
A5+14V ECU Power—W2—0.85SP-14V-1———
A6Knock 1————————
A7Shield Ground————————
A8Trigger 1—W12—0.5OEM-2-E———
A9Trigger 2—W13—0.5OEM-2-G———

OEM-1

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
AConstant +12V————————
BECU power +14V (main relay)—W1—0.85SP-14V-1———
CStart signal—W30—0.5G4XATOMX-A-A31———
EMalfunction indicator lamp (MIL)————————
GIgnition 1 (coils 1+4, wasted spark)—W14—0.5G4XATOMX-A-A13———
HIgnition 2 (coils 2+3, wasted spark)—W15—0.5G4XATOMX-A-A12———
JA/C relay—W20—0.5G4XATOMX-A-A21———
MVehicle speed—W29—0.5G4XATOMX-A-A30———
PPower steering pressure switch————————
QA/C request————————
RCooling fan relay—W21—0.5G4XATOMX-A-A20———
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)—W12—0.5G4XATOMX-A-A8———
FMAF ground—W9—0.5SP-0V-1———
GCam position (CAS G)—W13—0.5G4XATOMX-A-A9———
ITachometer output————————
K+5V sensor supply—W11—0.5G4XATOMX-A-A32———
MThrottle position (TPS)—W25—0.5G4XATOMX-A-A22———
NO2 sensor—W26—0.5G4XATOMX-A-A33———
OMass air flow (MAF)—W24—0.5G4XATOMX-A-A17———
PIntake air temperature (IAT)—W28—0.5G4XATOMX-A-A16———
QCoolant temperature (ECT)—W27—0.5G4XATOMX-A-A15———
RPRC solenoid (fuel pressure regulator)————————
SCondenser fan relay—W22—0.5G4XATOMX-A-A19———
TFuel pump relay—W23—0.5G4XATOMX-A-A18———
UInjector 1—W16—0.5G4XATOMX-A-A4———
VInjector 2—W17—0.5G4XATOMX-A-A3———
WISC solenoid————————
XEvap purge solenoid————————
YInjector 3—W18—0.5G4XATOMX-A-A2———
ZInjector 4—W19—0.5G4XATOMX-A-A1———

SP-0V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W9—0.5OEM-2-F———
1——W10—0.5G4XATOMX-A-A24———

SP-14V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W1—0.85OEM-1-B———
1——W2—0.85G4XATOMX-A-A5———

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—0.85G4XATOMX-A-A25———
1——W8—0.85G4XATOMX-A-A34———

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_inG4XATOMX-A-A5+14V ECU Powerpower_insingle_source
OEM-1-CStart signaldigital_inG4XATOMX-A-A31Digital Input 2digital_insingle_source
OEM-1-EMalfunction indicator lamp (MIL)low_side_out———single_source
OEM-1-GIgnition 1 (coils 1+4, wasted spark)ignition_outG4XATOMX-A-A13Ignition 1ignition_outsingle_source
OEM-1-HIgnition 2 (coils 2+3, wasted spark)ignition_outG4XATOMX-A-A12Ignition 2ignition_outsingle_source
OEM-1-JA/C relaylow_side_outG4XATOMX-A-A21Aux 1low_side_outsingle_source
OEM-1-MVehicle speeddigital_inG4XATOMX-A-A30Digital Input 1digital_insingle_source
OEM-1-PPower steering pressure switchdigital_in———single_source
OEM-1-QA/C requestdigital_in———single_source
OEM-1-RCooling fan relaylow_side_outG4XATOMX-A-A20Aux 2low_side_outsingle_source
OEM-1-VNeutral/clutch switchdigital_in———single_source
OEM-2-APower groundgroundG4XATOMX-A-A25 + G4XATOMX-A-A34System Ground + System Groundgroundsingle_source
OEM-2-BPower groundgroundG4XATOMX-A-A25 + G4XATOMX-A-A34System Ground + System Groundgroundsingle_source
OEM-2-CPower groundgroundG4XATOMX-A-A25 + G4XATOMX-A-A34System Ground + System Groundgroundsingle_source
OEM-2-DPower groundgroundG4XATOMX-A-A25 + G4XATOMX-A-A34System Ground + System Groundgroundsingle_source
OEM-2-ECrank position (CAS NE)trigger_inG4XATOMX-A-A8Trigger 1trigger_insingle_source
OEM-2-FMAF groundsensor_groundG4XATOMX-A-A24Sensor Groundsensor_groundsingle_source
OEM-2-GCam position (CAS G)trigger_inG4XATOMX-A-A9Trigger 2trigger_insingle_source
OEM-2-ITachometer outputtacho_out———single_source
OEM-2-K+5V sensor supplyvrefG4XATOMX-A-A32+5V Outvrefsingle_source
OEM-2-MThrottle position (TPS)analog_inG4XATOMX-A-A22Analog Volt 2analog_insingle_source
OEM-2-NO2 sensorlambda_nb_inG4XATOMX-A-A33Analog Volt 3analog_insingle_source
OEM-2-OMass air flow (MAF)analog_inG4XATOMX-A-A17Analog Volt 1analog_insingle_source
OEM-2-PIntake air temperature (IAT)temp_inG4XATOMX-A-A16Analog Temp 2temp_insingle_source
OEM-2-QCoolant temperature (ECT)temp_inG4XATOMX-A-A15Analog Temp 1temp_insingle_source
OEM-2-RPRC solenoid (fuel pressure regulator)low_side_out———single_source
OEM-2-SCondenser fan relaylow_side_outG4XATOMX-A-A19Aux 3low_side_outsingle_source
OEM-2-TFuel pump relaylow_side_outG4XATOMX-A-A18Aux 4low_side_outsingle_source
OEM-2-UInjector 1injector_outG4XATOMX-A-A4Injector 1injector_outsingle_source
OEM-2-VInjector 2injector_outG4XATOMX-A-A3Injector 2injector_outsingle_source
OEM-2-WISC solenoidlow_side_out———single_source
OEM-2-XEvap purge solenoidlow_side_out———single_source
OEM-2-YInjector 3injector_outG4XATOMX-A-A2Injector 3injector_outsingle_source
OEM-2-ZInjector 4injector_outG4XATOMX-A-A1Injector 4injector_outsingle_source

Cut list

WireFromToGauge (mm²)ColourLengthSignalIdent
W1OEM-1-BSP-14V-10.85no routeECU power +14V (main relay)—
W2SP-14V-1G4XATOMX-A-A50.85no route+14V ECU Power—
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-1G4XATOMX-A-A250.85no routeSystem Ground—
W8SP-GND-1G4XATOMX-A-A340.85no routeSystem Ground—
W9OEM-2-FSP-0V-10.5no routeMAF ground—
W10SP-0V-1G4XATOMX-A-A240.5no routeSensor Ground—
W11OEM-2-KG4XATOMX-A-A320.5no route+5V sensor supply—
W12OEM-2-EG4XATOMX-A-A80.5no routeCrank position (CAS NE)—
W13OEM-2-GG4XATOMX-A-A90.5no routeCam position (CAS G)—
W14OEM-1-GG4XATOMX-A-A130.5no routeIgnition 1 (coils 1+4, wasted spark)—
W15OEM-1-HG4XATOMX-A-A120.5no routeIgnition 2 (coils 2+3, wasted spark)—
W16OEM-2-UG4XATOMX-A-A40.5no routeInjector 1—
W17OEM-2-VG4XATOMX-A-A30.5no routeInjector 2—
W18OEM-2-YG4XATOMX-A-A20.5no routeInjector 3—
W19OEM-2-ZG4XATOMX-A-A10.5no routeInjector 4—
W20OEM-1-JG4XATOMX-A-A210.5no routeA/C relay—
W21OEM-1-RG4XATOMX-A-A200.5no routeCooling fan relay—
W22OEM-2-SG4XATOMX-A-A190.5no routeCondenser fan relay—
W23OEM-2-TG4XATOMX-A-A180.5no routeFuel pump relay—
W24OEM-2-OG4XATOMX-A-A170.5no routeMass air flow (MAF)—
W25OEM-2-MG4XATOMX-A-A220.5no routeThrottle position (TPS)—
W26OEM-2-NG4XATOMX-A-A330.5no routeO2 sensor—
W27OEM-2-QG4XATOMX-A-A150.5no routeCoolant temperature (ECT)—
W28OEM-2-PG4XATOMX-A-A160.5no routeIntake air temperature (IAT)—
W29OEM-1-MG4XATOMX-A-A300.5no routeVehicle speed—
W30OEM-1-CG4XATOMX-A-A310.5no routeStart signal—

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 (5)

SeverityCodeSubjectMessage
warnLOAD_UNKNOWNG4XATOMX-A-A18G4XATOMX-A-A18 "Aux 4" drives OEM-2-T Fuel pump relay (load 0.2 A) but its current rating is unknown. Check the ECU manual.
warnLOAD_UNKNOWNG4XATOMX-A-A19G4XATOMX-A-A19 "Aux 3" drives OEM-2-S Condenser fan relay (load 0.2 A) but its current rating is unknown. Check the ECU manual.
warnLOAD_UNKNOWNG4XATOMX-A-A20G4XATOMX-A-A20 "Aux 2" drives OEM-1-R Cooling fan relay (load 0.2 A) but its current rating is unknown. Check the ECU manual.
warnLOAD_UNKNOWNG4XATOMX-A-A21G4XATOMX-A-A21 "Aux 1" drives OEM-1-J A/C relay (load 0.2 A) but its current rating is unknown. Check the ECU manual.
infoUNMAPPEDOEM8 optional OEM pins are not mapped: OEM-1-E Malfunction indicator lamp (MIL); OEM-1-P Power steering pressure switch; OEM-1-Q A/C request; OEM-1-V Neutral/clutch switch; OEM-2-I Tachometer output; OEM-2-R PRC solenoid (fuel pressure regulator); OEM-2-W ISC solenoid; OEM-2-X Evap purge solenoid

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

Fit check: unconfirmed. Confirm these before building: - Trigger pattern for Mazda BP-ZE not found in the ECU's docs (Link's trigger-mode list is only inside PCLink, not online) 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: Link G4X AtomX has no battery-constant input; not needed - OEM-2 W: ISC solenoid: no free low_side/ls_hs/injector/hbridge rated ≥ 1.0 A on Link G4X AtomX - OEM-1 E: Malfunction indicator lamp (MIL): no free low_side/ls_hs/injector/hbridge on Link G4X AtomX - OEM-2 R: PRC solenoid (fuel pressure regulator): no free low_side/ls_hs/injector/hbridge on Link G4X AtomX - OEM-2 X: Evap purge solenoid: no free low_side/ls_hs/injector/hbridge on Link G4X AtomX - OEM-2 I: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on Link G4X AtomX - OEM-1 P: Power steering pressure switch: no free switch_in/frequency_in/analog_0_5 on Link G4X AtomX - OEM-1 Q: A/C request: no free switch_in/frequency_in/analog_0_5 on Link G4X AtomX - OEM-1 V: Neutral/clutch switch: no free switch_in/frequency_in/analog_0_5 on Link G4X AtomX

Sources

ReliabilityKindTitleURLArchiveCapturedSHA-256
4vendor_docLink G4X MX5X install manual (NA 1.6/1.8)https://linkecu.com/documentation/MX5X.pdfarchive2026-10-05b7f730de9f6e
4vendor_docLink: G4X AtomX quickstarthttps://linkecu.com/documentation/AtomXQuickstartGuide.pdfarchive2026-10-055fa903ea7bdf
3community_copyYourSpec: Link G4X AtomX ECU flying-lead harness wiring listhttps://wpm.yourspec.com/projects/view/1462———