Mazda RX-7 FD 1992-2002 (13B-REW twin-turbo) → generic Main relay (EFI) (auto)
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.
| Status | draft · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | 23: read the Findings page before cutting any wire |
| Size of the job | 6 wires · 6 connectors · 0 part lines |
| Tools | Crimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink |
| Order of work | 1. 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.
| Wire | From | To | Gauge | Colour | Cut | Label | Crimp A | Crimp B | Pin A | Pin B | Continuity |
|---|---|---|---|---|---|---|---|---|---|---|---|
| W1 | OEM-D-4A | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-D-4E | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | MAINRELAYEFI-R-COIL+ | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-A-1AF | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-A-1AJ | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-A-1L | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ |
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 A | Probe B | Expect | Why | Reading |
|---|---|---|---|---|---|
| 1 | OEM-A-1AF | MAINRELAYEFI-R-COIL+ | open (OL) | power ground must not touch +12 V supply |
If any reading doesn't match, stop and get help before powering up.
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
MAINRELAYEFI-R
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| COIL+ | Relay coil positive (ignition-switched +12V) | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| COIL- | Relay coil negative (ECU low-side driver) | — | — | — | — | — | — | — | — |
| IN | Relay contact input (battery + via main fuse) | — | — | — | — | — | — | — | — |
| OUT | Relay contact output (switched +12V bus) | — | — | — | — | — | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1AA | OMP stepper phase B1 | — | — | — | — | — | — | — | — |
| 1AB | Sensor ground | — | — | — | — | — | — | — | — |
| 1AC | Injector 4 (rear secondary) | — | — | — | — | — | — | — | — |
| 1AE | OMP stepper phase A1 | — | — | — | — | — | — | — | — |
| 1AF | Power ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| 1AJ | Power ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 1C | Idle speed control (ISC) solenoid | — | — | — | — | — | — | — | — |
| 1E | Turbo charge control solenoid | — | — | — | — | — | — | — | — |
| 1G | Purge solenoid | — | — | — | — | — | — | — | — |
| 1H | Cooling fan relay (low speed) | — | — | — | — | — | — | — | — |
| 1I | Turbo charge relief solenoid | — | — | — | — | — | — | — | — |
| 1K | Turbo pre-control solenoid | — | — | — | — | — | — | — | — |
| 1L | Power ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 1M | Turbo control solenoid | — | — | — | — | — | — | — | — |
| 1O | Boost control solenoid | — | — | — | — | — | — | — | — |
| 1Q | Injector 1 (front primary) | — | — | — | — | — | — | — | — |
| 1S | OMP stepper phase B2 | — | — | — | — | — | — | — | — |
| 1U | Injector 2 (rear primary) | — | — | — | — | — | — | — | — |
| 1W | OMP stepper phase A2 | — | — | — | — | — | — | — | — |
| 1X | Sensor ground | — | — | — | — | — | — | — | — |
| 1Y | Injector 3 (front secondary) | — | — | — | — | — | — | — | — |
OEM-C
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 3A | +5V sensor supply | — | — | — | — | — | — | — | — |
| 3AB | Sensor ground | — | — | — | — | — | — | — | — |
| 3D | O2 sensor (narrowband) | — | — | — | — | — | — | — | — |
| 3G | Fuel pressure regulator control (PRC) solenoid | — | — | — | — | — | — | — | — |
| 3H | OMP position sensor | — | — | — | — | — | — | — | — |
| 3I | Throttle position (TPS, full range) | — | — | — | — | — | — | — | — |
| 3O | Knock sensor | — | — | — | — | — | — | — | — |
| 3R | Crank position (CAS NE) | — | — | — | — | — | — | — | — |
| 3S | Sensor ground (CAS) | — | — | — | — | — | — | — | — |
| 3T | Intake air temperature (IAT) | — | — | — | — | — | — | — | — |
| 3U | Home position (CAS G) | — | — | — | — | — | — | — | — |
| 3V | Fuel temperature | — | — | — | — | — | — | — | — |
| 3W | Coolant temperature (ECT) | — | — | — | — | — | — | — | — |
OEM-D
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 4A | ECU main power (+12V via main relay/ECR) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 4AA | Brake pedal switch | — | — | — | — | — | — | — | — |
| 4AF | Ignition front trailing | — | — | — | — | — | — | — | — |
| 4AH | MAP sensor (PIM) | — | — | — | — | — | — | — | — |
| 4AJ | Ignition rear trailing | — | — | — | — | — | — | — | — |
| 4AN | Ignition leading (wasted spark) | — | — | — | — | — | — | — | — |
| 4B | Battery constant (+12V) | — | — | — | — | — | — | — | — |
| 4C | Start signal (STA) | — | — | — | — | — | — | — | — |
| 4D | Air pump clutch relay | — | — | — | — | — | — | — | — |
| 4E | ECU main power (+12V via main relay/ECR) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 4F | Fuel pump speed relay | — | — | — | — | — | — | — | — |
| 4G | Fuel pump relay | — | — | — | — | — | — | — | — |
| 4I | A/C relay | — | — | — | — | — | — | — | — |
| 4K | Cooling fan relay (low speed) | — | — | — | — | — | — | — | — |
| 4L | Cooling fan relay (high speed) | — | — | — | — | — | — | — | — |
| 4M | Tachometer output | — | — | — | — | — | — | — | — |
| 4Q | Vehicle speed sensor | — | — | — | — | — | — | — | — |
| 4S | Clutch switch | — | — | — | — | — | — | — | — |
| 4V | A/C request | — | — | — | — | — | — | — | — |
| 4W | Power steering pressure switch | — | — | — | — | — | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-D-4A | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-D-4E | — | — | — |
| 1 | — | — | W3 | — | 0.85 | MAINRELAYEFI-R-COIL+ | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 0.85 | OEM-A-1AF | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-A-1AJ | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-A-1L | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-A-1AA | OMP stepper phase B1 | hbridge_out | — | — | — | single_source | |
| OEM-A-1AB | Sensor ground | sensor_ground | — | — | — | single_source | |
| OEM-A-1AC | Injector 4 (rear secondary) | injector_out | — | — | — | single_source | |
| OEM-A-1AE | OMP stepper phase A1 | hbridge_out | — | — | — | single_source | |
| OEM-A-1AF | Power ground | ground | — | — | — | single_source | |
| OEM-A-1AJ | Power ground | ground | — | — | — | single_source | |
| OEM-A-1C | Idle speed control (ISC) solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-1E | Turbo charge control solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-1G | Purge solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-1H | Cooling fan relay (low speed) | low_side_out | — | — | — | single_source | |
| OEM-A-1I | Turbo charge relief solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-1K | Turbo pre-control solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-1L | Power ground | ground | — | — | — | single_source | |
| OEM-A-1M | Turbo control solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-1O | Boost control solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-1Q | Injector 1 (front primary) | injector_out | — | — | — | single_source | |
| OEM-A-1S | OMP stepper phase B2 | hbridge_out | — | — | — | single_source | |
| OEM-A-1U | Injector 2 (rear primary) | injector_out | — | — | — | single_source | |
| OEM-A-1W | OMP stepper phase A2 | hbridge_out | — | — | — | single_source | |
| OEM-A-1X | Sensor ground | sensor_ground | — | — | — | single_source | |
| OEM-A-1Y | Injector 3 (front secondary) | injector_out | — | — | — | single_source | |
| OEM-C-3A | +5V sensor supply | vref | — | — | — | single_source | |
| OEM-C-3AB | Sensor ground | sensor_ground | — | — | — | single_source | |
| OEM-C-3D | O2 sensor (narrowband) | lambda_nb_in | — | — | — | single_source | |
| OEM-C-3G | Fuel pressure regulator control (PRC) solenoid | low_side_out | — | — | — | single_source | |
| OEM-C-3H | OMP position sensor | analog_in | — | — | — | single_source | |
| OEM-C-3I | Throttle position (TPS, full range) | analog_in | — | — | — | single_source | |
| OEM-C-3O | Knock sensor | knock_in | — | — | — | single_source | |
| OEM-C-3R | Crank position (CAS NE) | trigger_in | — | — | — | single_source | |
| OEM-C-3S | Sensor ground (CAS) | sensor_ground | — | — | — | single_source | |
| OEM-C-3T | Intake air temperature (IAT) | temp_in | — | — | — | single_source | |
| OEM-C-3U | Home position (CAS G) | trigger_in | — | — | — | single_source | |
| OEM-C-3V | Fuel temperature | temp_in | — | — | — | single_source | |
| OEM-C-3W | Coolant temperature (ECT) | temp_in | — | — | — | single_source | |
| OEM-D-4A | ECU main power (+12V via main relay/ECR) | power_in | MAINRELAYEFI-R-COIL+ | Relay coil positive (ignition-switched +12V) | power_in | single_source | |
| OEM-D-4AA | Brake pedal switch | digital_in | — | — | — | single_source | |
| OEM-D-4AF | Ignition front trailing | ignition_out | — | — | — | single_source | |
| OEM-D-4AH | MAP sensor (PIM) | analog_in | — | — | — | single_source | |
| OEM-D-4AJ | Ignition rear trailing | ignition_out | — | — | — | single_source | |
| OEM-D-4AN | Ignition leading (wasted spark) | ignition_out | — | — | — | single_source | |
| OEM-D-4B | Battery constant (+12V) | power_in | — | — | — | single_source | |
| OEM-D-4C | Start signal (STA) | digital_in | — | — | — | single_source | |
| OEM-D-4D | Air pump clutch relay | low_side_out | — | — | — | single_source | |
| OEM-D-4E | ECU main power (+12V via main relay/ECR) | power_in | MAINRELAYEFI-R-COIL+ | Relay coil positive (ignition-switched +12V) | power_in | single_source | |
| OEM-D-4F | Fuel pump speed relay | low_side_out | — | — | — | single_source | |
| OEM-D-4G | Fuel pump relay | low_side_out | — | — | — | single_source | |
| OEM-D-4I | A/C relay | low_side_out | — | — | — | single_source | |
| OEM-D-4K | Cooling fan relay (low speed) | low_side_out | — | — | — | single_source | |
| OEM-D-4L | Cooling fan relay (high speed) | low_side_out | — | — | — | single_source | |
| OEM-D-4M | Tachometer output | tacho_out | — | — | — | single_source | |
| OEM-D-4Q | Vehicle speed sensor | digital_in | — | — | — | single_source | |
| OEM-D-4S | Clutch switch | digital_in | — | — | — | single_source | |
| OEM-D-4V | A/C request | digital_in | — | — | — | single_source | |
| OEM-D-4W | Power steering pressure switch | digital_in | — | — | — | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-D-4A | SP-14V-1 | 0.85 | no route | ECU main power (+12V via main relay/ECR) | — | |
| W2 | OEM-D-4E | SP-14V-1 | 0.85 | no route | ECU main power (+12V via main relay/ECR) | — | |
| W3 | SP-14V-1 | MAINRELAYEFI-R-COIL+ | 0.85 | no route | Relay coil positive (ignition-switched +12V) | — | |
| W4 | OEM-A-1AF | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W5 | OEM-A-1AJ | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W6 | OEM-A-1L | SP-GND-1 | 0.85 | no route | Power ground | — |
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 (24)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | PHYS_REQUIRED_OPEN | MAINRELAYEFI-R-COIL- | MAINRELAYEFI-R-COIL- "Relay coil negative (ECU low-side driver)" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | MAINRELAYEFI-R-IN | MAINRELAYEFI-R-IN "Relay contact input (battery + via main fuse)" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | MAINRELAYEFI-R-OUT | MAINRELAYEFI-R-OUT "Relay contact output (switched +12V bus)" is required but not wired. |
| error | REQUIRED_UNMAPPED | OEM-A-1AB | Required OEM function "Sensor ground" (sensor_ground) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-A-1AC | Required OEM function "Injector 4 (rear secondary)" (injector_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-A-1AF | Required OEM function "Power ground" (ground) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-A-1AJ | Required OEM function "Power ground" (ground) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-A-1L | Required OEM function "Power ground" (ground) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-A-1Q | Required OEM function "Injector 1 (front primary)" (injector_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-A-1U | Required OEM function "Injector 2 (rear primary)" (injector_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-A-1X | Required OEM function "Sensor ground" (sensor_ground) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-A-1Y | Required OEM function "Injector 3 (front secondary)" (injector_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-C-3A | Required OEM function "+5V sensor supply" (vref) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-C-3AB | Required OEM function "Sensor ground" (sensor_ground) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-C-3I | Required OEM function "Throttle position (TPS, full range)" (analog_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-C-3R | Required OEM function "Crank position (CAS NE)" (trigger_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-C-3S | Required OEM function "Sensor ground (CAS)" (sensor_ground) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-C-3U | Required OEM function "Home position (CAS G)" (trigger_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-C-3W | Required OEM function "Coolant temperature (ECT)" (temp_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-D-4AF | Required OEM function "Ignition front trailing" (ignition_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-D-4AH | Required OEM function "MAP sensor (PIM)" (analog_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-D-4AJ | Required OEM function "Ignition rear trailing" (ignition_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-D-4AN | Required OEM function "Ignition leading (wasted spark)" (ignition_out) is not connected to the new ECU. |
| info | UNMAPPED | OEM | 31 optional OEM pins are not mapped: OEM-A-1AA OMP stepper phase B1; OEM-A-1AE OMP stepper phase A1; OEM-A-1C Idle speed control (ISC) solenoid; OEM-A-1E Turbo charge control solenoid; OEM-A-1G Purge solenoid; OEM-A-1H Cooling fan relay (low speed); OEM-A-1I Turbo charge relief solenoid; OEM-A-1K Turbo pre-control solenoid; 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-3D O2 sensor (narrowband); OEM-C-3G Fuel pressure regulator control (PRC) solenoid; OEM-C-3H OMP position sensor; OEM-C-3O Knock sensor; OEM-C-3T Intake air temperature (IAT); OEM-C-3V Fuel temperature; OEM-D-4AA Brake pedal switch; OEM-D-4C Start signal (STA); OEM-D-4D Air pump clutch relay; OEM-D-4F Fuel pump speed relay; OEM-D-4G Fuel pump relay; OEM-D-4I A/C relay; OEM-D-4K Cooling fan relay (low speed); OEM-D-4L Cooling fan relay (high speed); OEM-D-4M Tachometer output; OEM-D-4Q Vehicle speed sensor; OEM-D-4S Clutch switch; OEM-D-4V A/C request; OEM-D-4W Power steering pressure switch |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-D-4B | 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 2026-10-20. Review every wire against both manuals before building. Open items: - generic Main relay (EFI): no power-ground pins in the library - generic Main relay (EFI): no sensor-ground pin in the library - OEM-C 3A: +5V sensor supply: generic Main relay (EFI) has no 5 V reference in the library - OEM-C 3R: Crank position (CAS NE): no free crank_vr/frequency_in input on generic Main relay (EFI) - OEM-C 3U: Home position (CAS G): no free cam_vr/cam_hall/frequency_in input on generic Main relay (EFI) - OEM-D 4AF: Ignition front trailing: no free ignition output on generic Main relay (EFI) - OEM-D 4AJ: Ignition rear trailing: no free ignition output on generic Main relay (EFI) - OEM-D 4AN: Ignition leading (wasted spark): no free ignition output on generic Main relay (EFI) - OEM-A 1Q: Injector 1 (front primary): no free injector output on generic Main relay (EFI) - OEM-A 1U: Injector 2 (rear primary): no free injector output on generic Main relay (EFI) - OEM-A 1Y: Injector 3 (front secondary): no free injector output on generic Main relay (EFI) - OEM-A 1AC: Injector 4 (rear secondary): no free injector output on generic Main relay (EFI) - OEM-D 4AH: MAP sensor (PIM): no free map/analog_0_5 on generic Main relay (EFI) - OEM-C 3I: Throttle position (TPS, full range): no free tps/analog_0_5 on generic Main relay (EFI) - OEM-C 3W: Coolant temperature (ECT): no free thermistor/analog_0_5 on generic Main relay (EFI) - OEM-A 1AB: Sensor ground: no rule for class ground_sensor; wire by hand - OEM-A 1X: Sensor ground: no rule for class ground_sensor; wire by hand - OEM-C 3AB: Sensor ground: no rule for class ground_sensor; wire by hand - OEM-C 3S: Sensor ground (CAS): no rule for class ground_sensor; wire by hand - MAINRELAYEFI-R COIL-: Relay coil negative (ECU low-side driver): required by generic Main relay (EFI) but no stock pin feeds it; wire by hand - MAINRELAYEFI-R IN: Relay contact input (battery + via main fuse): required by generic Main relay (EFI) but no stock pin feeds it; wire by hand - MAINRELAYEFI-R OUT: Relay contact output (switched +12V bus): required by generic Main relay (EFI) but no stock pin feeds it; wire by hand Not wired: - OEM-D 4B: Battery constant (+12V): generic Main relay (EFI) has no battery-constant memory input; not needed - OEM-C 3O: Knock sensor: no free knock input on generic Main relay (EFI) - OEM-A 1H: Cooling fan relay (low speed): no free relay_control/low_side/heater_low_side/ls_hs/injector rated ≥ 0.2 A on generic Main relay (EFI) - OEM-D 4D: Air pump clutch relay: no free relay_control/low_side/heater_low_side/ls_hs/injector rated ≥ 0.2 A on generic Main relay (EFI) - OEM-D 4F: Fuel pump speed relay: no free relay_control/low_side/heater_low_side/ls_hs/injector rated ≥ 0.2 A on generic Main relay (EFI) - OEM-D 4G: Fuel pump relay: no free relay_control/low_side/heater_low_side/ls_hs/injector rated ≥ 0.2 A on generic Main relay (EFI) - OEM-D 4I: A/C relay: no free relay_control/low_side/heater_low_side/ls_hs/injector rated ≥ 0.2 A on generic Main relay (EFI) - OEM-D 4K: Cooling fan relay (low speed): no free relay_control/low_side/heater_low_side/ls_hs/injector rated ≥ 0.2 A on generic Main relay (EFI) - OEM-D 4L: Cooling fan relay (high speed): no free relay_control/low_side/heater_low_side/ls_hs/injector rated ≥ 0.2 A on generic Main relay (EFI) - OEM-A 1C: Idle speed control (ISC) solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on generic Main relay (EFI) - OEM-A 1E: Turbo charge control solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on generic Main relay (EFI) - OEM-A 1G: Purge solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on generic Main relay (EFI) - OEM-A 1I: Turbo charge relief solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on generic Main relay (EFI) - OEM-A 1K: Turbo pre-control solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on generic Main relay (EFI) - OEM-A 1M: Turbo control solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on generic Main relay (EFI) - OEM-A 1O: Boost control solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on generic Main relay (EFI) - OEM-C 3G: Fuel pressure regulator control (PRC) solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on generic Main relay (EFI) - OEM-D 4M: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on generic Main relay (EFI) - OEM-C 3D: O2 sensor (narrowband): no free o2_narrowband/analog_0_5 on generic Main relay (EFI) - OEM-C 3T: Intake air temperature (IAT): no free thermistor/analog_0_5 on generic Main relay (EFI) - OEM-C 3V: Fuel temperature: no free thermistor/analog_0_5 on generic Main relay (EFI) - OEM-C 3H: OMP position sensor: no free analog_0_5 on generic Main relay (EFI) - OEM-D 4Q: Vehicle speed sensor: no free frequency_in/switch_in on generic Main relay (EFI) - OEM-D 4AA: Brake pedal switch: no free switch_in/frequency_in/analog_0_5 on generic Main relay (EFI) - OEM-D 4C: Start signal (STA): no free switch_in/frequency_in/analog_0_5 on generic Main relay (EFI) - OEM-D 4S: Clutch switch: no free switch_in/frequency_in/analog_0_5 on generic Main relay (EFI) - OEM-D 4V: A/C request: no free switch_in/frequency_in/analog_0_5 on generic Main relay (EFI) - OEM-D 4W: Power steering pressure switch: no free switch_in/frequency_in/analog_0_5 on generic Main relay (EFI) - OEM-A 1AA: OMP stepper phase B1: no +/− pair in the pinout (multi-phase or half-documented motor); wire by hand - OEM-A 1AE: OMP stepper phase A1: no +/− pair in the pinout (multi-phase or half-documented motor); wire by hand - OEM-A 1S: OMP stepper phase B2: no +/− pair in the pinout (multi-phase or half-documented motor); wire by hand - OEM-A 1W: OMP stepper phase A2: no +/− pair in the pinout (multi-phase or half-documented motor); wire by hand
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | Emtron SL4/SL6/SL8 pinout pages | https://docs.emtronaustralia.com.au/engine-management/wiring/index.html | archive | 2026-10-05 | e52b3da9996a |
| 4 | vendor_doc | Haltech: 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 | — | — | — |
| 3 | forum | rusEFI Mazda Miata 2002 engine wiring | https://github.com/rusefi/rusefi/wiki/Mazda-Miata-2002 | archive | 2026-10-05 | cc3cae670408 |
| 2 | forum | defreezemotorsport: MS3 FD3S 16-bit ECU pinout | https://defreezemotorsport.ru/doku.php?id=ms3:fd3s162 | — | — | — |