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Mazda RX-7 FD 1992-2002 (13B-REW twin-turbo) → Link G4X XtremeX 109-4000 (auto)

Mazda RX-7 FD 1992-2002 (13B-REW twin-turbo) — Link — G4X XtremeX
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 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.

Statusdraft · not yet verified: nobody has reported building and running this harness
Open errorsnone
Size of the job54 wires · 8 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-D-4ASP-14V-10.85☐☐☐☐☐☐☐
W2OEM-D-4ESP-14V-10.85☐☐☐☐☐☐☐
W3SP-14V-1G4XXTREMEX-A-A50.85☐☐☐☐☐☐☐
W4SP-14V-1G4XXTREMEX-B-B50.85☐☐☐☐☐☐☐
W5OEM-A-1AFSP-GND-10.85☐☐☐☐☐☐☐
W6OEM-A-1AJSP-GND-10.85☐☐☐☐☐☐☐
W7OEM-A-1LSP-GND-10.85☐☐☐☐☐☐☐
W8SP-GND-1G4XXTREMEX-A-A250.85☐☐☐☐☐☐☐
W9SP-GND-1G4XXTREMEX-A-A340.85☐☐☐☐☐☐☐
W10SP-GND-1G4XXTREMEX-B-B250.85☐☐☐☐☐☐☐
W11SP-GND-1G4XXTREMEX-B-B340.85☐☐☐☐☐☐☐
W12OEM-A-1ABSP-0V-10.5☐☐☐☐☐☐☐
W13OEM-A-1XSP-0V-10.5☐☐☐☐☐☐☐
W14OEM-C-3ABSP-0V-10.5☐☐☐☐☐☐☐
W15OEM-C-3SSP-0V-10.5☐☐☐☐☐☐☐
W16SP-0V-1G4XXTREMEX-A-A240.5☐☐☐☐☐☐☐
W17SP-0V-1G4XXTREMEX-B-B220.5☐☐☐☐☐☐☐
W18OEM-C-3AG4XXTREMEX-A-A320.5☐☐☐☐☐☐☐
W19OEM-C-3RG4XXTREMEX-A-A80.5☐☐☐☐☐☐☐
W20OEM-C-3UG4XXTREMEX-A-A90.5☐☐☐☐☐☐☐
W21OEM-C-3OG4XXTREMEX-B-B90.5☐☐☐☐☐☐☐
W22OEM-D-4AFG4XXTREMEX-A-A130.5☐☐☐☐☐☐☐
W23OEM-D-4AJG4XXTREMEX-A-A120.5☐☐☐☐☐☐☐
W24OEM-D-4ANG4XXTREMEX-A-A110.5☐☐☐☐☐☐☐
W25OEM-A-1QG4XXTREMEX-A-A40.5☐☐☐☐☐☐☐
W26OEM-A-1UG4XXTREMEX-A-A30.5☐☐☐☐☐☐☐
W27OEM-A-1YG4XXTREMEX-A-A20.5☐☐☐☐☐☐☐
W28OEM-A-1ACG4XXTREMEX-A-A10.5☐☐☐☐☐☐☐
W29OEM-A-1AAG4XXTREMEX-B-B180.5☐☐☐☐☐☐☐
W30OEM-A-1AEG4XXTREMEX-B-B260.5☐☐☐☐☐☐☐
W31OEM-A-1HG4XXTREMEX-A-A210.5☐☐☐☐☐☐☐
W32OEM-D-4DG4XXTREMEX-A-A200.5☐☐☐☐☐☐☐
W33OEM-D-4FG4XXTREMEX-A-A190.5☐☐☐☐☐☐☐
W34OEM-D-4GG4XXTREMEX-A-A180.5☐☐☐☐☐☐☐
W35OEM-D-4IG4XXTREMEX-A-A290.5☐☐☐☐☐☐☐
W36OEM-D-4KG4XXTREMEX-A-A280.5☐☐☐☐☐☐☐
W37OEM-D-4LG4XXTREMEX-A-A270.5☐☐☐☐☐☐☐
W38OEM-A-1CG4XXTREMEX-A-A260.5☐☐☐☐☐☐☐
W39OEM-A-1EG4XXTREMEX-B-B40.5☐☐☐☐☐☐☐
W40OEM-A-1GG4XXTREMEX-B-B30.5☐☐☐☐☐☐☐
W41OEM-A-1IG4XXTREMEX-B-B20.5☐☐☐☐☐☐☐
W42OEM-A-1KG4XXTREMEX-B-B10.5☐☐☐☐☐☐☐
W43OEM-D-4AHG4XXTREMEX-A-A170.5☐☐☐☐☐☐☐
W44OEM-C-3IG4XXTREMEX-A-A220.5☐☐☐☐☐☐☐
W45OEM-C-3DG4XXTREMEX-A-A330.5☐☐☐☐☐☐☐
W46OEM-C-3WG4XXTREMEX-A-A150.5☐☐☐☐☐☐☐
W47OEM-C-3TG4XXTREMEX-A-A160.5☐☐☐☐☐☐☐
W48OEM-C-3VG4XXTREMEX-B-B60.5☐☐☐☐☐☐☐
W49OEM-C-3HG4XXTREMEX-A-A140.5☐☐☐☐☐☐☐
W50OEM-D-4QG4XXTREMEX-A-A300.5☐☐☐☐☐☐☐
W51OEM-D-4AAG4XXTREMEX-A-A310.5☐☐☐☐☐☐☐
W52OEM-D-4SG4XXTREMEX-A-A230.5☐☐☐☐☐☐☐
W53OEM-D-4VG4XXTREMEX-B-B210.5☐☐☐☐☐☐☐
W54OEM-D-4WG4XXTREMEX-B-B200.5☐☐☐☐☐☐☐

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
1G4XXTREMEX-A-A24G4XXTREMEX-A-A32open (OL)sensor ground must not touch 5 V sensor reference
2G4XXTREMEX-A-A24G4XXTREMEX-A-A5open (OL)sensor ground must not touch +12 V supply
3G4XXTREMEX-A-A25G4XXTREMEX-A-A32open (OL)power ground must not touch 5 V sensor reference
4G4XXTREMEX-A-A25G4XXTREMEX-A-A5open (OL)power ground must not touch +12 V supply
5G4XXTREMEX-A-A32G4XXTREMEX-A-A5open (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

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Schematic

G4XXTREMEX-AG4XXTREMEX-BOEM-AOEM-BOEM-COEM-DSP-0VSP-14VSP-GND

Connectors

G4XXTREMEX-A

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
A1Injector 4—W28—0.5OEM-A-1AC———
A10Ignition 4————————
A11Ignition 3—W24—0.5OEM-D-4AN———
A12Ignition 2—W23—0.5OEM-D-4AJ———
A13Ignition 1—W22—0.5OEM-D-4AF———
A14Analog Volt 4—W49—0.5OEM-C-3H———
A15Analog Temp 1—W46—0.5OEM-C-3W———
A16Analog Temp 2—W47—0.5OEM-C-3T———
A17Analog Volt 1—W43—0.5OEM-D-4AH———
A18Aux 4—W34—0.5OEM-D-4G———
A19Aux 3—W33—0.5OEM-D-4F———
A2Injector 3—W27—0.5OEM-A-1Y———
A20Aux 2—W32—0.5OEM-D-4D———
A21Aux 1—W31—0.5OEM-A-1H———
A22Analog Volt 2—W44—0.5OEM-C-3I———
A23Digital Input 3—W52—0.5OEM-D-4S———
A24Sensor Ground—W16—0.5SP-0V-1———
A25System Ground—W8—0.85SP-GND-1———
A26Aux 8—W38—0.5OEM-A-1C———
A27Aux 7—W37—0.5OEM-D-4L———
A28Aux 6—W36—0.5OEM-D-4K———
A29Aux 5—W35—0.5OEM-D-4I———
A3Injector 2—W26—0.5OEM-A-1U———
A30Digital Input 1—W50—0.5OEM-D-4Q———
A31Digital Input 2—W51—0.5OEM-D-4AA———
A32+5V Out—W18—0.5OEM-C-3A———
A33Analog Volt 3—W45—0.5OEM-C-3D———
A34System Ground—W9—0.85SP-GND-1———
A4Injector 1—W25—0.5OEM-A-1Q———
A5+14V ECU Power—W3—0.85SP-14V-1———
A6+8V Out————————
A7Shield Ground————————
A8Trigger 1—W19—0.5OEM-C-3R———
A9Trigger 2—W20—0.5OEM-C-3U———

G4XXTREMEX-B

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
B1Injector 8—W42—0.5OEM-A-1K———
B10Ignition 8————————
B11Ignition 7————————
B12Ignition 6————————
B13Ignition 5————————
B15Analog Volt 6————————
B16Analog Volt 7————————
B17Shield Ground————————
B18Aux 9—W29—0.5OEM-A-1AA———
B19Digital Input 6————————
B2Injector 7—W41—0.5OEM-A-1I———
B20Digital Input 5—W54—0.5OEM-D-4W———
B21Digital Input 4—W53—0.5OEM-D-4V———
B22Sensor Ground—W17—0.5SP-0V-1———
B23Analog Volt 8————————
B24Analog Volt 9————————
B25System Ground—W10—0.85SP-GND-1———
B26Aux 10—W30—0.5OEM-A-1AE———
B27CAN 2 H————————
B28CAN 2 L————————
B29Digital Input 8————————
B3Injector 6—W40—0.5OEM-A-1G———
B30Digital Input 7————————
B31Analog Volt 10————————
B32Analog Volt 11————————
B33Analog Volt 5————————
B34System Ground—W11—0.85SP-GND-1———
B4Injector 5—W39—0.5OEM-A-1E———
B5Aux 9/10 E-Throttle Supply—W4—0.85SP-14V-1———
B6Analog Temp 3—W48—0.5OEM-C-3V———
B7Analog Temp 4————————
B8Knock 2————————
B9Knock 1—W21—0.5OEM-C-3O———

OEM-A

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1AAOMP stepper phase B1—W29—0.5G4XXTREMEX-B-B18———
1ABSensor ground—W12—0.5SP-0V-1———
1ACInjector 4 (rear secondary)—W28—0.5G4XXTREMEX-A-A1———
1AEOMP stepper phase A1—W30—0.5G4XXTREMEX-B-B26———
1AFPower ground—W5—0.85SP-GND-1———
1AJPower ground—W6—0.85SP-GND-1———
1CIdle speed control (ISC) solenoid—W38—0.5G4XXTREMEX-A-A26———
1ETurbo charge control solenoid—W39—0.5G4XXTREMEX-B-B4———
1GPurge solenoid—W40—0.5G4XXTREMEX-B-B3———
1HCooling fan relay (low speed)—W31—0.5G4XXTREMEX-A-A21———
1ITurbo charge relief solenoid—W41—0.5G4XXTREMEX-B-B2———
1KTurbo pre-control solenoid—W42—0.5G4XXTREMEX-B-B1———
1LPower ground—W7—0.85SP-GND-1———
1MTurbo control solenoid————————
1OBoost control solenoid————————
1QInjector 1 (front primary)—W25—0.5G4XXTREMEX-A-A4———
1SOMP stepper phase B2————————
1UInjector 2 (rear primary)—W26—0.5G4XXTREMEX-A-A3———
1WOMP stepper phase A2————————
1XSensor ground—W13—0.5SP-0V-1———
1YInjector 3 (front secondary)—W27—0.5G4XXTREMEX-A-A2———

OEM-C

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
3A+5V sensor supply—W18—0.5G4XXTREMEX-A-A32———
3ABSensor ground—W14—0.5SP-0V-1———
3DO2 sensor (narrowband)—W45—0.5G4XXTREMEX-A-A33———
3GFuel pressure regulator control (PRC) solenoid————————
3HOMP position sensor—W49—0.5G4XXTREMEX-A-A14———
3IThrottle position (TPS, full range)—W44—0.5G4XXTREMEX-A-A22———
3OKnock sensor—W21—0.5G4XXTREMEX-B-B9———
3RCrank position (CAS NE)—W19—0.5G4XXTREMEX-A-A8———
3SSensor ground (CAS)—W15—0.5SP-0V-1———
3TIntake air temperature (IAT)—W47—0.5G4XXTREMEX-A-A16———
3UHome position (CAS G)—W20—0.5G4XXTREMEX-A-A9———
3VFuel temperature—W48—0.5G4XXTREMEX-B-B6———
3WCoolant temperature (ECT)—W46—0.5G4XXTREMEX-A-A15———

OEM-D

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
4AECU main power (+12V via main relay/ECR)—W1—0.85SP-14V-1———
4AABrake pedal switch—W51—0.5G4XXTREMEX-A-A31———
4AFIgnition front trailing—W22—0.5G4XXTREMEX-A-A13———
4AHMAP sensor (PIM)—W43—0.5G4XXTREMEX-A-A17———
4AJIgnition rear trailing—W23—0.5G4XXTREMEX-A-A12———
4ANIgnition leading (wasted spark)—W24—0.5G4XXTREMEX-A-A11———
4BBattery constant (+12V)————————
4CIgnition switch / start signal————————
4DAir pump clutch relay—W32—0.5G4XXTREMEX-A-A20———
4EECU main power (+12V via main relay/ECR)—W2—0.85SP-14V-1———
4FFuel pump speed relay—W33—0.5G4XXTREMEX-A-A19———
4GFuel pump relay—W34—0.5G4XXTREMEX-A-A18———
4IA/C relay—W35—0.5G4XXTREMEX-A-A29———
4KCooling fan relay (low speed)—W36—0.5G4XXTREMEX-A-A28———
4LCooling fan relay (high speed)—W37—0.5G4XXTREMEX-A-A27———
4MTachometer output————————
4QVehicle speed sensor—W50—0.5G4XXTREMEX-A-A30———
4SClutch switch—W52—0.5G4XXTREMEX-A-A23———
4VA/C request—W53—0.5G4XXTREMEX-B-B21———
4WPower steering pressure switch—W54—0.5G4XXTREMEX-B-B20———

SP-0V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W12—0.5OEM-A-1AB———
1——W13—0.5OEM-A-1X———
1——W14—0.5OEM-C-3AB———
1——W15—0.5OEM-C-3S———
1——W16—0.5G4XXTREMEX-A-A24———
1——W17—0.5G4XXTREMEX-B-B22———

SP-14V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W1—0.85OEM-D-4A———
1——W2—0.85OEM-D-4E———
1——W3—0.85G4XXTREMEX-A-A5———
1——W4—0.85G4XXTREMEX-B-B5———

SP-GND

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W5—0.85OEM-A-1AF———
1——W6—0.85OEM-A-1AJ———
1——W7—0.85OEM-A-1L———
1——W8—0.85G4XXTREMEX-A-A25———
1——W9—0.85G4XXTREMEX-A-A34———
1——W10—0.85G4XXTREMEX-B-B25———
1——W11—0.85G4XXTREMEX-B-B34———

Pin map

OEM pointOEM functionOEM familyTarget pointTarget functionTarget familyWire colourEvidence
OEM-A-1AAOMP stepper phase B1hbridge_outG4XXTREMEX-B-B18Aux 9hbridge_outsingle_source
OEM-A-1ABSensor groundsensor_groundG4XXTREMEX-A-A24 + G4XXTREMEX-B-B22Sensor Ground + Sensor Groundsensor_groundsingle_source
OEM-A-1ACInjector 4 (rear secondary)injector_outG4XXTREMEX-A-A1Injector 4injector_outsingle_source
OEM-A-1AEOMP stepper phase A1hbridge_outG4XXTREMEX-B-B26Aux 10hbridge_outsingle_source
OEM-A-1AFPower groundgroundG4XXTREMEX-A-A25 + G4XXTREMEX-A-A34 + G4XXTREMEX-B-B25 + G4XXTREMEX-B-B34System Ground + System Ground + System Ground + System Groundgroundsingle_source
OEM-A-1AJPower groundgroundG4XXTREMEX-A-A25 + G4XXTREMEX-A-A34 + G4XXTREMEX-B-B25 + G4XXTREMEX-B-B34System Ground + System Ground + System Ground + System Groundgroundsingle_source
OEM-A-1CIdle speed control (ISC) solenoidlow_side_outG4XXTREMEX-A-A26Aux 8switch_outsingle_source
OEM-A-1ETurbo charge control solenoidlow_side_outG4XXTREMEX-B-B4Injector 5injector_outsingle_source
OEM-A-1GPurge solenoidlow_side_outG4XXTREMEX-B-B3Injector 6injector_outsingle_source
OEM-A-1HCooling fan relay (low speed)low_side_outG4XXTREMEX-A-A21Aux 1low_side_outsingle_source
OEM-A-1ITurbo charge relief solenoidlow_side_outG4XXTREMEX-B-B2Injector 7injector_outsingle_source
OEM-A-1KTurbo pre-control solenoidlow_side_outG4XXTREMEX-B-B1Injector 8injector_outsingle_source
OEM-A-1LPower groundgroundG4XXTREMEX-A-A25 + G4XXTREMEX-A-A34 + G4XXTREMEX-B-B25 + G4XXTREMEX-B-B34System Ground + System Ground + System Ground + System Groundgroundsingle_source
OEM-A-1MTurbo control solenoidlow_side_out———single_source
OEM-A-1OBoost control solenoidlow_side_out———single_source
OEM-A-1QInjector 1 (front primary)injector_outG4XXTREMEX-A-A4Injector 1injector_outsingle_source
OEM-A-1SOMP stepper phase B2hbridge_out———single_source
OEM-A-1UInjector 2 (rear primary)injector_outG4XXTREMEX-A-A3Injector 2injector_outsingle_source
OEM-A-1WOMP stepper phase A2hbridge_out———single_source
OEM-A-1XSensor groundsensor_groundG4XXTREMEX-A-A24 + G4XXTREMEX-B-B22Sensor Ground + Sensor Groundsensor_groundsingle_source
OEM-A-1YInjector 3 (front secondary)injector_outG4XXTREMEX-A-A2Injector 3injector_outsingle_source
OEM-C-3A+5V sensor supplyvrefG4XXTREMEX-A-A32+5V Outvrefsingle_source
OEM-C-3ABSensor groundsensor_groundG4XXTREMEX-A-A24 + G4XXTREMEX-B-B22Sensor Ground + Sensor Groundsensor_groundsingle_source
OEM-C-3DO2 sensor (narrowband)lambda_nb_inG4XXTREMEX-A-A33Analog Volt 3analog_insingle_source
OEM-C-3GFuel pressure regulator control (PRC) solenoidlow_side_out———single_source
OEM-C-3HOMP position sensoranalog_inG4XXTREMEX-A-A14Analog Volt 4analog_insingle_source
OEM-C-3IThrottle position (TPS, full range)analog_inG4XXTREMEX-A-A22Analog Volt 2analog_insingle_source
OEM-C-3OKnock sensorknock_inG4XXTREMEX-B-B9Knock 1knock_insingle_source
OEM-C-3RCrank position (CAS NE)trigger_inG4XXTREMEX-A-A8Trigger 1trigger_insingle_source
OEM-C-3SSensor ground (CAS)sensor_groundG4XXTREMEX-A-A24 + G4XXTREMEX-B-B22Sensor Ground + Sensor Groundsensor_groundsingle_source
OEM-C-3TIntake air temperature (IAT)temp_inG4XXTREMEX-A-A16Analog Temp 2temp_insingle_source
OEM-C-3UHome position (CAS G)trigger_inG4XXTREMEX-A-A9Trigger 2trigger_insingle_source
OEM-C-3VFuel temperaturetemp_inG4XXTREMEX-B-B6Analog Temp 3temp_insingle_source
OEM-C-3WCoolant temperature (ECT)temp_inG4XXTREMEX-A-A15Analog Temp 1temp_insingle_source
OEM-D-4AECU main power (+12V via main relay/ECR)power_inG4XXTREMEX-A-A5 + G4XXTREMEX-B-B5+14V ECU Power + Aux 9/10 E-Throttle Supplypower_insingle_source
OEM-D-4AABrake pedal switchdigital_inG4XXTREMEX-A-A31Digital Input 2digital_insingle_source
OEM-D-4AFIgnition front trailingignition_outG4XXTREMEX-A-A13Ignition 1ignition_outsingle_source
OEM-D-4AHMAP sensor (PIM)analog_inG4XXTREMEX-A-A17Analog Volt 1analog_insingle_source
OEM-D-4AJIgnition rear trailingignition_outG4XXTREMEX-A-A12Ignition 2ignition_outsingle_source
OEM-D-4ANIgnition leading (wasted spark)ignition_outG4XXTREMEX-A-A11Ignition 3ignition_outsingle_source
OEM-D-4BBattery constant (+12V)power_in———single_source
OEM-D-4CIgnition switch / start signaldigital_in———single_source
OEM-D-4DAir pump clutch relaylow_side_outG4XXTREMEX-A-A20Aux 2low_side_outsingle_source
OEM-D-4EECU main power (+12V via main relay/ECR)power_inG4XXTREMEX-A-A5 + G4XXTREMEX-B-B5+14V ECU Power + Aux 9/10 E-Throttle Supplypower_insingle_source
OEM-D-4FFuel pump speed relaylow_side_outG4XXTREMEX-A-A19Aux 3low_side_outsingle_source
OEM-D-4GFuel pump relaylow_side_outG4XXTREMEX-A-A18Aux 4low_side_outsingle_source
OEM-D-4IA/C relaylow_side_outG4XXTREMEX-A-A29Aux 5switch_outsingle_source
OEM-D-4KCooling fan relay (low speed)low_side_outG4XXTREMEX-A-A28Aux 6switch_outsingle_source
OEM-D-4LCooling fan relay (high speed)low_side_outG4XXTREMEX-A-A27Aux 7switch_outsingle_source
OEM-D-4MTachometer outputtacho_out———single_source
OEM-D-4QVehicle speed sensordigital_inG4XXTREMEX-A-A30Digital Input 1digital_insingle_source
OEM-D-4SClutch switchdigital_inG4XXTREMEX-A-A23Digital Input 3digital_insingle_source
OEM-D-4VA/C requestdigital_inG4XXTREMEX-B-B21Digital Input 4digital_insingle_source
OEM-D-4WPower steering pressure switchdigital_inG4XXTREMEX-B-B20Digital Input 5digital_insingle_source

Cut list

WireFromToGauge (mm²)ColourLengthSignalIdent
W1OEM-D-4ASP-14V-10.85no routeECU main power (+12V via main relay/ECR)—
W2OEM-D-4ESP-14V-10.85no routeECU main power (+12V via main relay/ECR)—
W3SP-14V-1G4XXTREMEX-A-A50.85no route+14V ECU Power—
W4SP-14V-1G4XXTREMEX-B-B50.85no routeAux 9/10 E-Throttle Supply—
W5OEM-A-1AFSP-GND-10.85no routePower ground—
W6OEM-A-1AJSP-GND-10.85no routePower ground—
W7OEM-A-1LSP-GND-10.85no routePower ground—
W8SP-GND-1G4XXTREMEX-A-A250.85no routeSystem Ground—
W9SP-GND-1G4XXTREMEX-A-A340.85no routeSystem Ground—
W10SP-GND-1G4XXTREMEX-B-B250.85no routeSystem Ground—
W11SP-GND-1G4XXTREMEX-B-B340.85no routeSystem Ground—
W12OEM-A-1ABSP-0V-10.5no routeSensor ground—
W13OEM-A-1XSP-0V-10.5no routeSensor ground—
W14OEM-C-3ABSP-0V-10.5no routeSensor ground—
W15OEM-C-3SSP-0V-10.5no routeSensor ground (CAS)—
W16SP-0V-1G4XXTREMEX-A-A240.5no routeSensor Ground—
W17SP-0V-1G4XXTREMEX-B-B220.5no routeSensor Ground—
W18OEM-C-3AG4XXTREMEX-A-A320.5no route+5V sensor supply—
W19OEM-C-3RG4XXTREMEX-A-A80.5no routeCrank position (CAS NE)—
W20OEM-C-3UG4XXTREMEX-A-A90.5no routeHome position (CAS G)—
W21OEM-C-3OG4XXTREMEX-B-B90.5no routeKnock sensor—
W22OEM-D-4AFG4XXTREMEX-A-A130.5no routeIgnition front trailing—
W23OEM-D-4AJG4XXTREMEX-A-A120.5no routeIgnition rear trailing—
W24OEM-D-4ANG4XXTREMEX-A-A110.5no routeIgnition leading (wasted spark)—
W25OEM-A-1QG4XXTREMEX-A-A40.5no routeInjector 1 (front primary)—
W26OEM-A-1UG4XXTREMEX-A-A30.5no routeInjector 2 (rear primary)—
W27OEM-A-1YG4XXTREMEX-A-A20.5no routeInjector 3 (front secondary)—
W28OEM-A-1ACG4XXTREMEX-A-A10.5no routeInjector 4 (rear secondary)—
W29OEM-A-1AAG4XXTREMEX-B-B180.5no routeOMP stepper phase B1—
W30OEM-A-1AEG4XXTREMEX-B-B260.5no routeOMP stepper phase A1—
W31OEM-A-1HG4XXTREMEX-A-A210.5no routeCooling fan relay (low speed)—
W32OEM-D-4DG4XXTREMEX-A-A200.5no routeAir pump clutch relay—
W33OEM-D-4FG4XXTREMEX-A-A190.5no routeFuel pump speed relay—
W34OEM-D-4GG4XXTREMEX-A-A180.5no routeFuel pump relay—
W35OEM-D-4IG4XXTREMEX-A-A290.5no routeA/C relay—
W36OEM-D-4KG4XXTREMEX-A-A280.5no routeCooling fan relay (low speed)—
W37OEM-D-4LG4XXTREMEX-A-A270.5no routeCooling fan relay (high speed)—
W38OEM-A-1CG4XXTREMEX-A-A260.5no routeIdle speed control (ISC) solenoid—
W39OEM-A-1EG4XXTREMEX-B-B40.5no routeTurbo charge control solenoid—
W40OEM-A-1GG4XXTREMEX-B-B30.5no routePurge solenoid—
W41OEM-A-1IG4XXTREMEX-B-B20.5no routeTurbo charge relief solenoid—
W42OEM-A-1KG4XXTREMEX-B-B10.5no routeTurbo pre-control solenoid—
W43OEM-D-4AHG4XXTREMEX-A-A170.5no routeMAP sensor (PIM)—
W44OEM-C-3IG4XXTREMEX-A-A220.5no routeThrottle position (TPS, full range)—
W45OEM-C-3DG4XXTREMEX-A-A330.5no routeO2 sensor (narrowband)—
W46OEM-C-3WG4XXTREMEX-A-A150.5no routeCoolant temperature (ECT)—
W47OEM-C-3TG4XXTREMEX-A-A160.5no routeIntake air temperature (IAT)—
W48OEM-C-3VG4XXTREMEX-B-B60.5no routeFuel temperature—
W49OEM-C-3HG4XXTREMEX-A-A140.5no routeOMP position sensor—
W50OEM-D-4QG4XXTREMEX-A-A300.5no routeVehicle speed sensor—
W51OEM-D-4AAG4XXTREMEX-A-A310.5no routeBrake pedal switch—
W52OEM-D-4SG4XXTREMEX-A-A230.5no routeClutch switch—
W53OEM-D-4VG4XXTREMEX-B-B210.5no routeA/C request—
W54OEM-D-4WG4XXTREMEX-B-B200.5no routePower steering pressure switch—

Bill of materials

CategoryPart numberManufacturerDescriptionQtyUnit

ECU setup sheet

RoleEngine refEngine signalSensorECU pointECU functionECU classSetup flag
No configured channels.

Findings

Open (16)

SeverityCodeSubjectMessage
warnLOAD_UNKNOWNG4XXTREMEX-A-A18G4XXTREMEX-A-A18 "Aux 4" drives OEM-D-4G Fuel pump relay (load 0.2 A) but its current rating is unknown. Check the ECU manual.
warnLOAD_UNKNOWNG4XXTREMEX-A-A19G4XXTREMEX-A-A19 "Aux 3" drives OEM-D-4F Fuel pump speed relay (load 0.2 A) but its current rating is unknown. Check the ECU manual.
warnLOAD_UNKNOWNG4XXTREMEX-A-A20G4XXTREMEX-A-A20 "Aux 2" drives OEM-D-4D Air pump clutch relay (load 0.2 A) but its current rating is unknown. Check the ECU manual.
warnLOAD_UNKNOWNG4XXTREMEX-A-A21G4XXTREMEX-A-A21 "Aux 1" drives OEM-A-1H Cooling fan relay (low speed) (load 0.2 A) but its current rating is unknown. Check the ECU manual.
warnLOAD_UNKNOWNG4XXTREMEX-A-A27G4XXTREMEX-A-A27 "Aux 7" drives OEM-D-4L Cooling fan relay (high speed) (load 0.2 A) but its current rating is unknown. Check the ECU manual.
warnLOAD_UNKNOWNG4XXTREMEX-A-A28G4XXTREMEX-A-A28 "Aux 6" drives OEM-D-4K Cooling fan relay (low speed) (load 0.2 A) but its current rating is unknown. Check the ECU manual.
warnLOAD_UNKNOWNG4XXTREMEX-A-A29G4XXTREMEX-A-A29 "Aux 5" drives OEM-D-4I A/C relay (load 0.2 A) but its current rating is unknown. Check the ECU manual.
infoNET_FAMILYOEM-A-1C ↔ G4XXTREMEX-A-A26OEM-A-1C "Idle speed control (ISC) solenoid" [low_side_out] is wired to G4XXTREMEX-A-A26 "Aux 8" [switch_out]. Configure this output as low side.
infoNET_FAMILYOEM-A-1E ↔ G4XXTREMEX-B-B4OEM-A-1E "Turbo charge control solenoid" [low_side_out] is wired to G4XXTREMEX-B-B4 "Injector 5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
infoNET_FAMILYOEM-A-1G ↔ G4XXTREMEX-B-B3OEM-A-1G "Purge solenoid" [low_side_out] is wired to G4XXTREMEX-B-B3 "Injector 6" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
infoNET_FAMILYOEM-A-1I ↔ G4XXTREMEX-B-B2OEM-A-1I "Turbo charge relief solenoid" [low_side_out] is wired to G4XXTREMEX-B-B2 "Injector 7" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
infoNET_FAMILYOEM-A-1K ↔ G4XXTREMEX-B-B1OEM-A-1K "Turbo pre-control solenoid" [low_side_out] is wired to G4XXTREMEX-B-B1 "Injector 8" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
infoNET_FAMILYOEM-D-4I ↔ G4XXTREMEX-A-A29OEM-D-4I "A/C relay" [low_side_out] is wired to G4XXTREMEX-A-A29 "Aux 5" [switch_out]. Configure this output as low side.
infoNET_FAMILYOEM-D-4K ↔ G4XXTREMEX-A-A28OEM-D-4K "Cooling fan relay (low speed)" [low_side_out] is wired to G4XXTREMEX-A-A28 "Aux 6" [switch_out]. Configure this output as low side.
infoNET_FAMILYOEM-D-4L ↔ G4XXTREMEX-A-A27OEM-D-4L "Cooling fan relay (high speed)" [low_side_out] is wired to G4XXTREMEX-A-A27 "Aux 7" [switch_out]. Configure this output as low side.
infoUNMAPPEDOEM7 optional OEM pins are not mapped: OEM-A-1M Turbo control solenoid; OEM-A-1O Boost control solenoid; OEM-A-1S OMP stepper phase B2; OEM-A-1W OMP stepper phase A2; OEM-C-3G Fuel pressure regulator control (PRC) solenoid; OEM-D-4C Ignition switch / start signal; OEM-D-4M Tachometer output

Accepted (1)

CodeSubjectReasonBy
REQUIRED_UNMAPPEDOEM-D-4BBattery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed.mapping-proposal

Notes

Fit check: needs add-on. Resolve these before building: - Oil metering pump stepper driver needed; not documented for this ECU - Sequential twin-turbo control needed; not documented for this ECU - Trigger pattern for Mazda 13B-REW 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 2026-10-11. Review every wire against both manuals before building. Not wired: - OEM-D 4B: Battery constant (+12V): Link G4X XtremeX has no battery-constant input; not needed - OEM-D 4C: Ignition switch / start signal: key-on 12 V sense — optional in a swap (the main relay is energized from keyed 12 V, not from this pin); Link G4X XtremeX has no dedicated key-on input - OEM-A 1S: OMP stepper phase B2: no free hbridge on Link G4X XtremeX - OEM-A 1W: OMP stepper phase A2: no free hbridge on Link G4X XtremeX - OEM-A 1M: Turbo control solenoid: no free low_side/ls_hs/injector/hbridge on Link G4X XtremeX - OEM-A 1O: Boost control solenoid: no free low_side/ls_hs/injector/hbridge on Link G4X XtremeX - OEM-C 3G: Fuel pressure regulator control (PRC) solenoid: no free low_side/ls_hs/injector/hbridge on Link G4X XtremeX - OEM-D 4M: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on Link G4X XtremeX

Sources

ReliabilityKindTitleURLArchiveCapturedSHA-256
4vendor_docHaltech: RX7 FD Series 7-8 Nexus PnP adapter pinout (HT-186338)https://www.haltech.com/wp-admin/admin-ajax.php?action=ht_get_file&id=681af8c0cc78f3b6860e615e&op=1———
4vendor_docLink: G4X XtremeX quickstart guidehttps://linkecu.com/documentation/XtremeXQuickstartGuide.pdf———
3community_copyYourSpec: Link G4X XtremeX flying-lead harness wiring listhttps://wpm.yourspec.com/projects/view/1488———
2forumdefreezemotorsport: MS3 FD3S 16-bit ECU pinouthttps://defreezemotorsport.ru/doku.php?id=ms3:fd3s162———