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 · 2026-10-05
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
MS3PROMINI-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 12V+ switched power in | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 10 | Injector out F | — | W16 | — | 0.5 | OEM-2-U | — | — | — |
| 11 | Injector out G | — | W17 | — | 0.5 | OEM-2-V | — | — | — |
| 12 | Injector out H | — | W18 | — | 0.5 | OEM-2-Y | — | — | — |
| 13 | Analog in 1 | — | W21 | — | 0.5 | OEM-2-O | — | — | — |
| 14 | Analog in 2 | — | W22 | — | 0.5 | OEM-2-N | — | — | — |
| 15 | Analog in 3 | — | W28 | — | 0.5 | OEM-1-Q | — | — | — |
| 16 | Analog in 4 | — | W29 | — | 0.5 | OEM-1-V | — | — | — |
| 17 | Spark out A | — | W14 | — | 0.5 | OEM-1-G | — | — | — |
| 18 | Spark out B | — | W15 | — | 0.5 | OEM-1-H | — | — | — |
| 19 | Spark out C | — | — | — | — | — | — | — | — |
| 2 | +5V VREF out | — | W11 | — | 0.5 | OEM-2-K | — | — | — |
| 20 | Spark out D | — | — | — | — | — | — | — | — |
| 21 | Sensor ground | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 22 | Power ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 23 | Power ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 24 | CAN Low | — | — | — | — | — | — | — | — |
| 25 | CAN High | — | — | — | — | — | — | — | — |
| 26 | CLT in | — | W23 | — | 0.5 | OEM-2-Q | — | — | — |
| 27 | IAT in | — | W24 | — | 0.5 | OEM-2-P | — | — | — |
| 28 | TPS in | — | — | — | — | — | — | — | — |
| 29 | Digital switched in 1 / Flex fuel | — | W25 | — | 0.5 | OEM-1-C | — | — | — |
| 3 | PWM out 1 / Idle | — | W20 | — | 0.5 | OEM-1-E | — | — | — |
| 30 | CKP+ | — | W12 | — | 0.5 | OEM-2-E | — | — | — |
| 31 | CKP- | — | — | — | — | — | — | — | — |
| 32 | CMP+ | — | W13 | — | 0.5 | OEM-2-G | — | — | — |
| 33 | CMP- | — | — | — | — | — | — | — | — |
| 34 | Digital frequency in 1 (Hall) | — | W26 | — | 0.5 | OEM-1-N | — | — | — |
| 35 | Digital frequency in 2 (Hall) | — | W27 | — | 0.5 | OEM-1-P | — | — | — |
| 4 | Fuel pump out | — | — | — | — | — | — | — | — |
| 5 | Injector out A | — | W19 | — | 0.5 | OEM-2-Z | — | — | — |
| 6 | Injector out B | — | — | — | — | — | — | — | — |
| 7 | Injector out C | — | — | — | — | — | — | — | — |
| 8 | Injector out D | — | — | — | — | — | — | — | — |
| 9 | Injector out E | — | — | — | — | — | — | — | — |
OEM-1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Constant +12V | — | — | — | — | — | — | — | — |
| B | ECU power +14V (main relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| C | Start signal | — | W25 | — | 0.5 | MS3PROMINI-A-29 | — | — | — |
| E | Malfunction indicator lamp (MIL) | — | W20 | — | 0.5 | MS3PROMINI-A-3 | — | — | — |
| G | Ignition 1 (coils 1+4, wasted spark) | — | W14 | — | 0.5 | MS3PROMINI-A-17 | — | — | — |
| H | Ignition 2 (coils 2+3, wasted spark) | — | W15 | — | 0.5 | MS3PROMINI-A-18 | — | — | — |
| N | Wide-open throttle switch | — | W26 | — | 0.5 | MS3PROMINI-A-34 | — | — | — |
| P | Power steering pressure switch | — | W27 | — | 0.5 | MS3PROMINI-A-35 | — | — | — |
| Q | A/C request | — | W28 | — | 0.5 | MS3PROMINI-A-15 | — | — | — |
| V | Neutral/clutch switch | — | W29 | — | 0.5 | MS3PROMINI-A-16 | — | — | — |
OEM-2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Power ground | — | W3 | — | 0.85 | SP-GND-1 | — | — | — |
| B | Power ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| C | Power ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| D | Power ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| E | Crank position (CAS NE) | — | W12 | — | 0.5 | MS3PROMINI-A-30 | — | — | — |
| F | AFM ground | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| G | Cam position (CAS G) | — | W13 | — | 0.5 | MS3PROMINI-A-32 | — | — | — |
| I | Tachometer output | — | — | — | — | — | — | — | — |
| K | +5V sensor supply | — | W11 | — | 0.5 | MS3PROMINI-A-2 | — | — | — |
| L | Idle switch (TPS) | — | — | — | — | — | — | — | — |
| N | O2 sensor | — | W22 | — | 0.5 | MS3PROMINI-A-14 | — | — | — |
| O | Air flow meter (AFM) | — | W21 | — | 0.5 | MS3PROMINI-A-13 | — | — | — |
| P | Intake air temperature (IAT) | — | W24 | — | 0.5 | MS3PROMINI-A-27 | — | — | — |
| Q | Coolant temperature (ECT) | — | W23 | — | 0.5 | MS3PROMINI-A-26 | — | — | — |
| U | Injector 1 | — | W16 | — | 0.5 | MS3PROMINI-A-10 | — | — | — |
| V | Injector 2 | — | W17 | — | 0.5 | MS3PROMINI-A-11 | — | — | — |
| Y | Injector 3 | — | W18 | — | 0.5 | MS3PROMINI-A-12 | — | — | — |
| Z | Injector 4 | — | W19 | — | 0.5 | MS3PROMINI-A-5 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W9 | — | 0.5 | OEM-2-F | — | — | — |
| 1 | — | — | W10 | — | 0.5 | MS3PROMINI-A-21 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-1-B | — | — | — |
| 1 | — | — | W2 | — | 0.85 | MS3PROMINI-A-1 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W3 | — | 0.85 | OEM-2-A | — | — | — |
| 1 | — | — | W4 | — | 0.85 | OEM-2-B | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-2-C | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-2-D | — | — | — |
| 1 | — | — | W7 | — | 0.85 | MS3PROMINI-A-22 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | MS3PROMINI-A-23 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-1-A | Constant +12V | power_in | — | — | — | single_source | |
| OEM-1-B | ECU power +14V (main relay) | power_in | MS3PROMINI-A-1 | 12V+ switched power in | power_in | single_source | |
| OEM-1-C | Start signal | digital_in | MS3PROMINI-A-29 | Digital switched in 1 / Flex fuel | digital_in | single_source | |
| OEM-1-E | Malfunction indicator lamp (MIL) | low_side_out | MS3PROMINI-A-3 | PWM out 1 / Idle | low_side_out | single_source | |
| OEM-1-G | Ignition 1 (coils 1+4, wasted spark) | ignition_out | MS3PROMINI-A-17 | Spark out A | ignition_out | single_source | |
| OEM-1-H | Ignition 2 (coils 2+3, wasted spark) | ignition_out | MS3PROMINI-A-18 | Spark out B | ignition_out | single_source | |
| OEM-1-N | Wide-open throttle switch | digital_in | MS3PROMINI-A-34 | Digital frequency in 1 (Hall) | digital_in | single_source | |
| OEM-1-P | Power steering pressure switch | digital_in | MS3PROMINI-A-35 | Digital frequency in 2 (Hall) | digital_in | single_source | |
| OEM-1-Q | A/C request | digital_in | MS3PROMINI-A-15 | Analog in 3 | analog_in | single_source | |
| OEM-1-V | Neutral/clutch switch | digital_in | MS3PROMINI-A-16 | Analog in 4 | analog_in | single_source | |
| OEM-2-A | Power ground | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | single_source | |
| OEM-2-B | Power ground | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | single_source | |
| OEM-2-C | Power ground | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | single_source | |
| OEM-2-D | Power ground | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | single_source | |
| OEM-2-E | Crank position (CAS NE) | trigger_in | MS3PROMINI-A-30 | CKP+ | trigger_in | single_source | |
| OEM-2-F | AFM ground | sensor_ground | MS3PROMINI-A-21 | Sensor ground | sensor_ground | single_source | |
| OEM-2-G | Cam position (CAS G) | trigger_in | MS3PROMINI-A-32 | CMP+ | trigger_in | single_source | |
| OEM-2-I | Tachometer output | tacho_out | — | — | — | single_source | |
| OEM-2-K | +5V sensor supply | vref | MS3PROMINI-A-2 | +5V VREF out | vref | single_source | |
| OEM-2-L | Idle switch (TPS) | digital_in | — | — | — | single_source | |
| OEM-2-N | O2 sensor | lambda_nb_in | MS3PROMINI-A-14 | Analog in 2 | analog_in | single_source | |
| OEM-2-O | Air flow meter (AFM) | analog_in | MS3PROMINI-A-13 | Analog in 1 | analog_in | single_source | |
| OEM-2-P | Intake air temperature (IAT) | temp_in | MS3PROMINI-A-27 | IAT in | temp_in | single_source | |
| OEM-2-Q | Coolant temperature (ECT) | temp_in | MS3PROMINI-A-26 | CLT in | temp_in | single_source | |
| OEM-2-U | Injector 1 | injector_out | MS3PROMINI-A-10 | Injector out F | injector_out | single_source | |
| OEM-2-V | Injector 2 | injector_out | MS3PROMINI-A-11 | Injector out G | injector_out | single_source | |
| OEM-2-Y | Injector 3 | injector_out | MS3PROMINI-A-12 | Injector out H | injector_out | single_source | |
| OEM-2-Z | Injector 4 | injector_out | MS3PROMINI-A-5 | Injector out A | injector_out | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-1-B | SP-14V-1 | 0.85 | no route | ECU power +14V (main relay) | — | |
| W2 | SP-14V-1 | MS3PROMINI-A-1 | 0.85 | no route | 12V+ switched power in | — | |
| W3 | OEM-2-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W4 | OEM-2-B | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W5 | OEM-2-C | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W6 | OEM-2-D | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W7 | SP-GND-1 | MS3PROMINI-A-22 | 0.85 | no route | Power ground | — | |
| W8 | SP-GND-1 | MS3PROMINI-A-23 | 0.85 | no route | Power ground | — | |
| W9 | OEM-2-F | SP-0V-1 | 0.5 | no route | AFM ground | — | |
| W10 | SP-0V-1 | MS3PROMINI-A-21 | 0.5 | no route | Sensor ground | — | |
| W11 | OEM-2-K | MS3PROMINI-A-2 | 0.5 | no route | +5V sensor supply | — | |
| W12 | OEM-2-E | MS3PROMINI-A-30 | 0.5 | no route | Crank position (CAS NE) | — | |
| W13 | OEM-2-G | MS3PROMINI-A-32 | 0.5 | no route | Cam position (CAS G) | — | |
| W14 | OEM-1-G | MS3PROMINI-A-17 | 0.5 | no route | Ignition 1 (coils 1+4, wasted spark) | — | |
| W15 | OEM-1-H | MS3PROMINI-A-18 | 0.5 | no route | Ignition 2 (coils 2+3, wasted spark) | — | |
| W16 | OEM-2-U | MS3PROMINI-A-10 | 0.5 | no route | Injector 1 | — | |
| W17 | OEM-2-V | MS3PROMINI-A-11 | 0.5 | no route | Injector 2 | — | |
| W18 | OEM-2-Y | MS3PROMINI-A-12 | 0.5 | no route | Injector 3 | — | |
| W19 | OEM-2-Z | MS3PROMINI-A-5 | 0.5 | no route | Injector 4 | — | |
| W20 | OEM-1-E | MS3PROMINI-A-3 | 0.5 | no route | Malfunction indicator lamp (MIL) | — | |
| W21 | OEM-2-O | MS3PROMINI-A-13 | 0.5 | no route | Air flow meter (AFM) | — | |
| W22 | OEM-2-N | MS3PROMINI-A-14 | 0.5 | no route | O2 sensor | — | |
| W23 | OEM-2-Q | MS3PROMINI-A-26 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W24 | OEM-2-P | MS3PROMINI-A-27 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W25 | OEM-1-C | MS3PROMINI-A-29 | 0.5 | no route | Start signal | — | |
| W26 | OEM-1-N | MS3PROMINI-A-34 | 0.5 | no route | Wide-open throttle switch | — | |
| W27 | OEM-1-P | MS3PROMINI-A-35 | 0.5 | no route | Power steering pressure switch | — | |
| W28 | OEM-1-Q | MS3PROMINI-A-15 | 0.5 | no route | A/C request | — | |
| W29 | OEM-1-V | MS3PROMINI-A-16 | 0.5 | no route | Neutral/clutch switch | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (3)
| Severity | Code | Subject | Message |
|---|---|---|---|
| warn | NET_FAMILY | OEM-1-Q ↔ MS3PROMINI-A-15 | OEM-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. |
| warn | NET_FAMILY | OEM-1-V ↔ MS3PROMINI-A-16 | OEM-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. |
| info | UNMAPPED | OEM | 2 optional OEM pins are not mapped: OEM-2-I Tachometer output; OEM-2-L Idle switch (TPS) |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-1-A | Battery-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 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
| Reliability | Kind | Title | URL |
|---|---|---|---|
| 4 | vendor_doc | AMP EFI: MS3Pro Mini manual (fw 1.6.1) pinout & output ratings | https://cdn.shopify.com/s/files/1/0960/0014/7754/files/MS3Pro_User_Manual_Firmware_1.6.1_Mini.pdf?v=1760643335 |
| 4 | vendor_doc | Link G4X MX5X install manual (NA 1.6/1.8) | https://linkecu.com/documentation/MX5X.pdf |