← Back

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

MX-5 Miata NA6 1990-93 (B6-ZE, 1.6) — AMP EFI — MS3Pro EVO+ HC
Drawn by Michael Gnankou · Rev 0 · proposal · 2026-10-04

Revisions

RevLabelByDate
No revisions yet.

Schematic

MS3PROEVOHC-AMS3PROEVOHC-BMS3PROEVOHC-COEM-1OEM-2SP-0VSP-14VSP-GND

Connectors

MS3PROEVOHC-A

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1High current out 1————————
10MAT in—W34—0.5OEM-2-Q———
11CLT in—W35—0.5OEM-2-P———
12Analog In 6————————
13Logic Ground—W12—0.5SP-0V-1———
14PWM / Idle Out 1—W30—0.5OEM-1-E———
15CKP−—W21—0.5SP-0V-1———
16Ground Shield Drain————————
17Analog In 7————————
18Sensor return—W13—0.5SP-0V-1———
19Analog in 1—W32—0.5OEM-2-O———
2High current out 2————————
20Analog in 2————————
21Analog in 3————————
22Analog In 4————————
23Analog In 5————————
24Tach out—W31—0.5OEM-2-I———
25O2 in—W33—0.5OEM-2-N———
26CMP+—W22—0.5OEM-2-G———
27CMP−—W23—0.5SP-0V-1———
28Fuel pump relay out————————
29PWM out 2————————
3Injector out J—W26—0.5OEM-2-U———
30PWM out 3————————
31Knock in 1————————
32Digital switched in 1—W36—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————————

MS3PROEVOHC-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—W37—0.5OEM-1-N———
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)—W41—0.5OEM-2-L———
29Digital switched in 3—W38—0.5OEM-1-P———
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———

MS3PROEVOHC-C

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1PWM out 5————————
10Digital switched in 5—W40—0.5OEM-1-V———
11Digital switched in 4—W39—0.5OEM-1-Q———
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————————
20Sensor return—W17—0.5SP-0V-1———
21Sensor return—W18—0.5SP-0V-1———
225V+ VREF out 1————————
3Digital out 2————————
4Digital out 1————————
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—W36—0.5MS3PROEVOHC-A-32———
EMalfunction indicator lamp (MIL)—W30—0.5MS3PROEVOHC-A-14———
GIgnition 1 (coils 1+4, wasted spark)—W24—0.5MS3PROEVOHC-B-13———
HIgnition 2 (coils 2+3, wasted spark)—W25—0.5MS3PROEVOHC-B-14———
NWide-open throttle switch—W37—0.5MS3PROEVOHC-B-20———
PPower steering pressure switch—W38—0.5MS3PROEVOHC-B-29———
QA/C request—W39—0.5MS3PROEVOHC-C-11———
VNeutral/clutch switch—W40—0.5MS3PROEVOHC-C-10———

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—0.5MS3PROEVOHC-A-6———
FAFM ground—W11—0.5SP-0V-1———
GCam position (CAS G)—W22—0.5MS3PROEVOHC-A-26———
ITachometer output—W31—0.5MS3PROEVOHC-A-24———
K+5V sensor supply—W19—0.5MS3PROEVOHC-A-8———
LIdle switch (TPS)—W41—0.5MS3PROEVOHC-B-28———
NO2 sensor—W33—0.5MS3PROEVOHC-A-25———
OAir flow meter (AFM)—W32—0.5MS3PROEVOHC-A-19———
PIntake air temperature (IAT)—W35—0.5MS3PROEVOHC-A-11———
QCoolant temperature (ECT)—W34—0.5MS3PROEVOHC-A-10———
UInjector 1—W26—0.5MS3PROEVOHC-A-3———
VInjector 2—W27—0.5MS3PROEVOHC-A-4———
YInjector 3—W28—0.5MS3PROEVOHC-B-1———
ZInjector 4—W29—0.5MS3PROEVOHC-B-10———

SP-0V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W11—0.5OEM-2-F———
1——W12—0.5MS3PROEVOHC-A-13———
1——W13—0.5MS3PROEVOHC-A-18———
1——W14—0.5MS3PROEVOHC-C-17———
1——W15—0.5MS3PROEVOHC-C-18———
1——W16—0.5MS3PROEVOHC-C-19———
1——W17—0.5MS3PROEVOHC-C-20———
1——W18—0.5MS3PROEVOHC-C-21———
1——W21—0.5MS3PROEVOHC-A-15———
1——W23—0.5MS3PROEVOHC-A-27———

SP-14V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W1—0.85OEM-1-B———
1——W2—0.85MS3PROEVOHC-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—0.85MS3PROEVOHC-B-3———
1——W8—0.85MS3PROEVOHC-B-5———
1——W9—0.85MS3PROEVOHC-B-7———
1——W10—0.85MS3PROEVOHC-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_inMS3PROEVOHC-A-3512V+ switched power inpower_insingle_source
OEM-1-CStart signaldigital_inMS3PROEVOHC-A-32Digital switched in 1digital_insingle_source
OEM-1-EMalfunction indicator lamp (MIL)low_side_outMS3PROEVOHC-A-14PWM / Idle Out 1low_side_outsingle_source
OEM-1-GIgnition 1 (coils 1+4, wasted spark)ignition_outMS3PROEVOHC-B-13Spark out Gignition_outsingle_source
OEM-1-HIgnition 2 (coils 2+3, wasted spark)ignition_outMS3PROEVOHC-B-14Spark out Eignition_outsingle_source
OEM-1-NWide-open throttle switchdigital_inMS3PROEVOHC-B-20Digital switched in 2digital_insingle_source
OEM-1-PPower steering pressure switchdigital_inMS3PROEVOHC-B-29Digital switched in 3digital_insingle_source
OEM-1-QA/C requestdigital_inMS3PROEVOHC-C-11Digital switched in 4digital_insingle_source
OEM-1-VNeutral/clutch switchdigital_inMS3PROEVOHC-C-10Digital switched in 5digital_insingle_source
OEM-2-APower groundgroundMS3PROEVOHC-B-3 + MS3PROEVOHC-B-5 + MS3PROEVOHC-B-7 + MS3PROEVOHC-B-9Ground + Ground + Ground + Groundgroundsingle_source
OEM-2-BPower groundgroundMS3PROEVOHC-B-3 + MS3PROEVOHC-B-5 + MS3PROEVOHC-B-7 + MS3PROEVOHC-B-9Ground + Ground + Ground + Groundgroundsingle_source
OEM-2-CPower groundgroundMS3PROEVOHC-B-3 + MS3PROEVOHC-B-5 + MS3PROEVOHC-B-7 + MS3PROEVOHC-B-9Ground + Ground + Ground + Groundgroundsingle_source
OEM-2-DPower groundgroundMS3PROEVOHC-B-3 + MS3PROEVOHC-B-5 + MS3PROEVOHC-B-7 + MS3PROEVOHC-B-9Ground + Ground + Ground + Groundgroundsingle_source
OEM-2-ECrank position (CAS NE)trigger_inMS3PROEVOHC-A-6CKP+trigger_insingle_source
OEM-2-FAFM groundsensor_groundMS3PROEVOHC-A-13 + MS3PROEVOHC-A-15 + MS3PROEVOHC-A-18 + MS3PROEVOHC-A-27 + MS3PROEVOHC-C-17 + MS3PROEVOHC-C-18 + MS3PROEVOHC-C-19 + MS3PROEVOHC-C-20 + MS3PROEVOHC-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_inMS3PROEVOHC-A-26CMP+trigger_insingle_source
OEM-2-ITachometer outputtacho_outMS3PROEVOHC-A-24Tach outtacho_outsingle_source
OEM-2-K+5V sensor supplyvrefMS3PROEVOHC-A-85V+ VREF outvrefsingle_source
OEM-2-LIdle switch (TPS)digital_inMS3PROEVOHC-B-28Digital frequency in 1 (unconditioned)digital_insingle_source
OEM-2-NO2 sensorlambda_nb_inMS3PROEVOHC-A-25O2 inlambda_nb_insingle_source
OEM-2-OAir flow meter (AFM)analog_inMS3PROEVOHC-A-19Analog in 1analog_insingle_source
OEM-2-PIntake air temperature (IAT)temp_inMS3PROEVOHC-A-11CLT intemp_insingle_source
OEM-2-QCoolant temperature (ECT)temp_inMS3PROEVOHC-A-10MAT intemp_insingle_source
OEM-2-UInjector 1injector_outMS3PROEVOHC-A-3Injector out Jinjector_outsingle_source
OEM-2-VInjector 2injector_outMS3PROEVOHC-A-4Injector out Iinjector_outsingle_source
OEM-2-YInjector 3injector_outMS3PROEVOHC-B-1Injector out Ainjector_outsingle_source
OEM-2-ZInjector 4injector_outMS3PROEVOHC-B-10Injector out Finjector_outsingle_source

Cut list

WireFromToGauge (mm²)ColourLengthSignalIdent
W1OEM-1-BSP-14V-10.85no routeECU power +14V (main relay)—
W2SP-14V-1MS3PROEVOHC-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-1MS3PROEVOHC-B-30.85no routeGround—
W8SP-GND-1MS3PROEVOHC-B-50.85no routeGround—
W9SP-GND-1MS3PROEVOHC-B-70.85no routeGround—
W10SP-GND-1MS3PROEVOHC-B-90.85no routeGround—
W11OEM-2-FSP-0V-10.5no routeAFM ground—
W12SP-0V-1MS3PROEVOHC-A-130.5no routeLogic Ground—
W13SP-0V-1MS3PROEVOHC-A-180.5no routeSensor return—
W14SP-0V-1MS3PROEVOHC-C-170.5no routeSensor return—
W15SP-0V-1MS3PROEVOHC-C-180.5no routeSensor return—
W16SP-0V-1MS3PROEVOHC-C-190.5no routeSensor return—
W17SP-0V-1MS3PROEVOHC-C-200.5no routeSensor return—
W18SP-0V-1MS3PROEVOHC-C-210.5no routeSensor return—
W19OEM-2-KMS3PROEVOHC-A-80.5no route+5V sensor supply—
W20OEM-2-EMS3PROEVOHC-A-60.5no routeCrank position (CAS NE)—
W21SP-0V-1MS3PROEVOHC-A-150.5no routeCKP−—
W22OEM-2-GMS3PROEVOHC-A-260.5no routeCam position (CAS G)—
W23SP-0V-1MS3PROEVOHC-A-270.5no routeCMP−—
W24OEM-1-GMS3PROEVOHC-B-130.5no routeIgnition 1 (coils 1+4, wasted spark)—
W25OEM-1-HMS3PROEVOHC-B-140.5no routeIgnition 2 (coils 2+3, wasted spark)—
W26OEM-2-UMS3PROEVOHC-A-30.5no routeInjector 1—
W27OEM-2-VMS3PROEVOHC-A-40.5no routeInjector 2—
W28OEM-2-YMS3PROEVOHC-B-10.5no routeInjector 3—
W29OEM-2-ZMS3PROEVOHC-B-100.5no routeInjector 4—
W30OEM-1-EMS3PROEVOHC-A-140.5no routeMalfunction indicator lamp (MIL)—
W31OEM-2-IMS3PROEVOHC-A-240.5no routeTachometer output—
W32OEM-2-OMS3PROEVOHC-A-190.5no routeAir flow meter (AFM)—
W33OEM-2-NMS3PROEVOHC-A-250.5no routeO2 sensor—
W34OEM-2-QMS3PROEVOHC-A-100.5no routeCoolant temperature (ECT)—
W35OEM-2-PMS3PROEVOHC-A-110.5no routeIntake air temperature (IAT)—
W36OEM-1-CMS3PROEVOHC-A-320.5no routeStart signal—
W37OEM-1-NMS3PROEVOHC-B-200.5no routeWide-open throttle switch—
W38OEM-1-PMS3PROEVOHC-B-290.5no routePower steering pressure switch—
W39OEM-1-QMS3PROEVOHC-C-110.5no routeA/C request—
W40OEM-1-VMS3PROEVOHC-C-100.5no routeNeutral/clutch switch—
W41OEM-2-LMS3PROEVOHC-B-280.5no routeIdle switch (TPS)—

Bill of materials

CategoryPart numberManufacturerDescriptionQtyUnit

ECU setup sheet

RoleEngine refEngine signalSensorECU pointECU functionECU classSetup flag
No configured channels.

Findings

Open (1)

SeverityCodeSubjectMessage
infoNET_FAMILYMS3PROEVOHC-A-15 ↔ MS3PROEVOHC-C-19MS3PROEVOHC-A-15 "CKP−" [trigger_in] is wired to MS3PROEVOHC-C-19 "Sensor return" [sensor_ground]. 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+ HC has no battery-constant input; not needed - MS3PROEVOHC-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