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Which ECU for the Mazda MX-5 Miata NB2 2001-05 (BP-Z3, VVT)?

Every ECU below has a harness for this car. They all run the engine basics; the difference is how many of the stock ECU's other functions each one can still wire, and how much spare I/O is left for add-ons such as boost control or a wideband. “Of 47” counts the stock functions at least one ECU here wires.

Most complete

AMP EFI MS3Pro Ultimate

Can carry 47 of 47 stock functions, with 8 spare outputs and 11 spare inputs left.

Smallest that keeps every engine function

AMP EFI MS3Pro EVO+

89 ECU pins. Gives up 1 non-engine functions: power.

Most room for add-ons

MaxxECU PRO REV10+

35 spare outputs and 22 spare inputs after the stock wiring, with every engine function kept.

“Smallest” is by pin count, not price. Picks come from harnesses with no validation errors.

What each ECU wires and gives up

  • AMP EFI MS3Pro Ultimate93 pins · proposal
    47/47
    Gives up nothing8 out · 11 inDetails ▾

    Gives up (no free pin on this ECU)

    Nothing that another ECU wires for this car.

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • MoTeC M190 13190136 pins · proposal
    46/47
    Dash & gauges 127 out · 27 inDetails ▾

    Gives up (no free pin on this ECU)

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Tachometer output

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • MoTeC M150 13150120 pins · proposal
    46/47
    Dash & gauges 115 out · 27 inDetails ▾

    Gives up (no free pin on this ECU)

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Tachometer output

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • AMP EFI MS3Pro EVO+89 pins · proposal
    46/47
    Power 18 out · 11 inDetails ▾

    Gives up (no free pin on this ECU)

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • AMP EFI MS3Pro EVO+ HC89 pins · proposal
    46/47
    Power 18 out · 11 inDetails ▾

    Gives up (no free pin on this ECU)

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • MaxxECU PRO REV10+155 pins · proposal
    45/47
    Dash & gauges 1Power 135 out · 22 inDetails ▾

    Gives up (no free pin on this ECU)

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Tachometer output

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Emtron KV16120 pins · proposal
    45/47
    Dash & gauges 1Power 123 out · 19 inDetails ▾

    Gives up (no free pin on this ECU)

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Tachometer output

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Emtron KV12115 pins · proposal
    45/47
    Dash & gauges 1Power 119 out · 19 inDetails ▾

    Gives up (no free pin on this ECU)

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Tachometer output

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • MaxxECU GEN2 RACE136 pins · proposal
    45/47
    Dash & gauges 1Power 119 out · 17 inDetails ▾

    Gives up (no free pin on this ECU)

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Tachometer output

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Emtron KV8106 pins · proposal
    45/47
    Dash & gauges 1Power 111 out · 19 inDetails ▾

    Gives up (no free pin on this ECU)

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Tachometer output

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • ECUMASTER EMU PRO 16120 pins · draft · 1 error
    44/47
    Engine 1Dash & gauges 1Power 125 out · 22 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • Cam position (CMP)

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Tachometer output

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Emtron Shadow 868 pins · draft · 1 error
    43/47
    Engine 1Charging 1Dash & gauges 26 out · 8 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • VVT oil-control solenoid

    Charging

    ECU control of the alternator. Without it the alternator charges at its own fixed setting; confirm in the service manual.

    • Alternator control

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Charge lamp
    • Tachometer output

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • rusEFI Proteus93 pins · proposal
    42/47
    Engine 1Charging 1Dash & gauges 2Power 116 out · 9 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • VVT oil-control solenoid

    Charging

    ECU control of the alternator. Without it the alternator charges at its own fixed setting; confirm in the service manual.

    • Alternator control

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Charge lamp
    • Tachometer output

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • MaxxECU GEN2 TRACK93 pins · proposal
    42/47
    Engine 1Charging 1Dash & gauges 2Power 110 out · 7 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • VVT oil-control solenoid

    Charging

    ECU control of the alternator. Without it the alternator charges at its own fixed setting; confirm in the service manual.

    • Alternator control

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Charge lamp
    • Tachometer output

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Haltech Nexus S3 HT-21300068 pins · proposal
    42/47
    Engine 1Charging 1Dash & gauges 2Power 16 out · 4 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • VVT oil-control solenoid

    Charging

    ECU control of the alternator. Without it the alternator charges at its own fixed setting; confirm in the service manual.

    • Alternator control

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Charge lamp
    • Tachometer output

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Emtron SL866 pins · proposal
    0/47
    Engine 4Power 1Engine 19 not wired yet (free pin available)+42 it could still wire on free pins14 out · 15 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • +5V sensor supply
    • Cam position (CMP)
    • Crank position (CKP)
    • Signal ground

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    No bigger ECU needed: the harness can be extended onto spare I/O.

    Engine

    • Coolant temperature (ECT)
    • Front O2 heater
    • Front O2 signal
    • Fuel pump relay — Immobiliser-dependent; some models use 2O.
    • ISC valve low side — Idle speed control, ECU-driven low side.
    • Ignition 1 (coils 1+4, wasted spark)
    • Ignition 2 (coils 2+3, wasted spark)
    • Injector 1
    • Injector 2
    • Injector 3
    • Injector 4
    • Intake air temperature (IAT)
    • Knock sensor
    • Main relay — Mazdaspeed turbo only.
    • Mass air flow (MAF)
    • Throttle position (TPS)
    • VTCS solenoid (intake butterflies)
    • VTCS vacuum switch
    • VVT oil-control solenoid — S-VT intake-cam phasing solenoid.

    Charging

    • Alternator control

    Idle & accessories

    • A/C clutch relay
    • A/C request
    • Brake switch
    • Clutch switch
    • Condenser fan relay
    • Cooling fan relay
    • Neutral switch
    • Power steering pressure switch
    • Vehicle speed

    Dash & gauges

    • Charge lamp — Alternator charge-lamp line; direction to confirm.
    • Fuel level
    • Immobiliser
    • Malfunction indicator lamp (MIL)
    • Tachometer output

    Emissions

    • Charcoal canister purge
    • EGR boost solenoid
    • EGR valve
    • EGR valve
    • EGR valve
    • EGR valve
    • Rear O2 heater
    • Rear O2 signal

    Open harness → · Spare I/O

  • MaxxECU RACE REV9+80 pins · proposal
    41/47
    Engine 2Idle & accessories 1Dash & gauges 2Power 18 out · 3 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • VTCS vacuum switch
    • VVT oil-control solenoid

    Idle & accessories

    Electrical load, A/C, fans, switches. Tune idle around them, or wire them to spare I/O later.

    • Clutch switch

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Charge lamp
    • Tachometer output

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Haltech Elite 2500 HT-15130060 pins · proposal
    41/47
    Engine 2Charging 1Dash & gauges 2Power 16 out · 2 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • VTCS vacuum switch
    • VVT oil-control solenoid

    Charging

    ECU control of the alternator. Without it the alternator charges at its own fixed setting; confirm in the service manual.

    • Alternator control

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Charge lamp
    • Tachometer output

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Link G4X XtremeX 109-400067 pins · draft
    40/47
    Engine 1Charging 1Dash & gauges 2Emissions 2Power 16 out · 9 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • VVT oil-control solenoid

    Charging

    ECU control of the alternator. Without it the alternator charges at its own fixed setting; confirm in the service manual.

    • Alternator control

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Charge lamp
    • Tachometer output

    Emissions

    Emissions hardware. Usually deleted on race and off-road builds; may set a check-engine light or fail an inspection.

    • Charcoal canister purge
    • EGR boost solenoid

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Link G4X FuryX 122-400068 pins · draft
    40/47
    Engine 1Charging 1Dash & gauges 2Emissions 2Power 15 out · 7 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • VVT oil-control solenoid

    Charging

    ECU control of the alternator. Without it the alternator charges at its own fixed setting; confirm in the service manual.

    • Alternator control

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Charge lamp
    • Tachometer output

    Emissions

    Emissions hardware. Usually deleted on race and off-road builds; may set a check-engine light or fail an inspection.

    • Charcoal canister purge
    • EGR boost solenoid

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • MoTeC M170 1317066 pins · proposal
    39/47
    Engine 2Charging 1Dash & gauges 3Emissions 26 out · 4 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • VTCS solenoid (intake butterflies)
    • VVT oil-control solenoid

    Charging

    ECU control of the alternator. Without it the alternator charges at its own fixed setting; confirm in the service manual.

    • Alternator control

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Charge lamp
    • Malfunction indicator lamp (MIL)
    • Tachometer output

    Emissions

    Emissions hardware. Usually deleted on race and off-road builds; may set a check-engine light or fail an inspection.

    • Charcoal canister purge
    • EGR boost solenoid

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • MoTeC M130 1313060 pins · proposal
    39/47
    Engine 2Charging 1Dash & gauges 3Emissions 26 out · 3 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • VTCS solenoid (intake butterflies)
    • VVT oil-control solenoid

    Charging

    ECU control of the alternator. Without it the alternator charges at its own fixed setting; confirm in the service manual.

    • Alternator control

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Charge lamp
    • Malfunction indicator lamp (MIL)
    • Tachometer output

    Emissions

    Emissions hardware. Usually deleted on race and off-road builds; may set a check-engine light or fail an inspection.

    • Charcoal canister purge
    • EGR boost solenoid

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Emtron SL662 pins · proposal
    39/47
    Engine 1Charging 1Dash & gauges 3Emissions 2Power 14 out · 5 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • VVT oil-control solenoid

    Charging

    ECU control of the alternator. Without it the alternator charges at its own fixed setting; confirm in the service manual.

    • Alternator control

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Charge lamp
    • Malfunction indicator lamp (MIL)
    • Tachometer output

    Emissions

    Emissions hardware. Usually deleted on race and off-road builds; may set a check-engine light or fail an inspection.

    • Charcoal canister purge
    • EGR boost solenoid

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Link G4X StormX 108-400060 pins · draft
    38/47
    Engine 2Charging 1Dash & gauges 3Emissions 2Power 16 out · 5 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • VTCS solenoid (intake butterflies)
    • VVT oil-control solenoid

    Charging

    ECU control of the alternator. Without it the alternator charges at its own fixed setting; confirm in the service manual.

    • Alternator control

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Charge lamp
    • Malfunction indicator lamp (MIL)
    • Tachometer output

    Emissions

    Emissions hardware. Usually deleted on race and off-road builds; may set a check-engine light or fail an inspection.

    • Charcoal canister purge
    • EGR boost solenoid

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • ECUMASTER EMU Black63 pins · proposal
    38/47
    Engine 2Charging 1Dash & gauges 3Emissions 2Power 14 out · 3 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • VTCS vacuum switch
    • VVT oil-control solenoid

    Charging

    ECU control of the alternator. Without it the alternator charges at its own fixed setting; confirm in the service manual.

    • Alternator control

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Charge lamp
    • Malfunction indicator lamp (MIL)
    • Tachometer output

    Emissions

    Emissions hardware. Usually deleted on race and off-road builds; may set a check-engine light or fail an inspection.

    • Charcoal canister purge
    • EGR boost solenoid

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Emtron SL458 pins · proposal
    37/47
    Engine 2Charging 1Dash & gauges 3Emissions 3Power 12 out · 5 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • VTCS solenoid (intake butterflies)
    • VVT oil-control solenoid

    Charging

    ECU control of the alternator. Without it the alternator charges at its own fixed setting; confirm in the service manual.

    • Alternator control

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Charge lamp
    • Malfunction indicator lamp (MIL)
    • Tachometer output

    Emissions

    Emissions hardware. Usually deleted on race and off-road builds; may set a check-engine light or fail an inspection.

    • Charcoal canister purge
    • EGR boost solenoid
    • EGR valve

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Haltech Elite 1500 HT-15090051 pins · proposal
    37/47
    Engine 3Charging 1Dash & gauges 3Emissions 2Power 12 out · 1 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • VTCS solenoid (intake butterflies)
    • VTCS vacuum switch
    • VVT oil-control solenoid

    Charging

    ECU control of the alternator. Without it the alternator charges at its own fixed setting; confirm in the service manual.

    • Alternator control

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Charge lamp
    • Malfunction indicator lamp (MIL)
    • Tachometer output

    Emissions

    Emissions hardware. Usually deleted on race and off-road builds; may set a check-engine light or fail an inspection.

    • Charcoal canister purge
    • EGR boost solenoid

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • MoTeC M800 universal60 pins · proposal
    36/47
    Engine 4Charging 1Dash & gauges 3Emissions 2Power 14 out · 4 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • Knock sensor
    • VTCS solenoid (intake butterflies)
    • VTCS vacuum switch
    • VVT oil-control solenoid

    Charging

    ECU control of the alternator. Without it the alternator charges at its own fixed setting; confirm in the service manual.

    • Alternator control

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Charge lamp
    • Malfunction indicator lamp (MIL)
    • Tachometer output

    Emissions

    Emissions hardware. Usually deleted on race and off-road builds; may set a check-engine light or fail an inspection.

    • Charcoal canister purge
    • EGR boost solenoid

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • MaxxECU SPORT REV9+48 pins · proposal
    32/47
    Engine 4Charging 1Idle & accessories 3Dash & gauges 3Emissions 3Power 14 out · 2 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • Knock sensor
    • VTCS solenoid (intake butterflies)
    • VTCS vacuum switch
    • VVT oil-control solenoid

    Charging

    ECU control of the alternator. Without it the alternator charges at its own fixed setting; confirm in the service manual.

    • Alternator control

    Idle & accessories

    Electrical load, A/C, fans, switches. Tune idle around them, or wire them to spare I/O later.

    • A/C request
    • Clutch switch
    • Neutral switch

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Charge lamp
    • Malfunction indicator lamp (MIL)
    • Tachometer output

    Emissions

    Emissions hardware. Usually deleted on race and off-road builds; may set a check-engine light or fail an inspection.

    • Charcoal canister purge
    • EGR boost solenoid
    • EGR valve

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Speeduino v0.436 pins · draft · 2 errors
    27/47
    Engine 6Charging 1Idle & accessories 5Dash & gauges 3Emissions 4Power 12 out · 3 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • Front O2 signal
    • Knock sensor
    • Mass air flow (MAF)
    • VTCS solenoid (intake butterflies)
    • VTCS vacuum switch
    • VVT oil-control solenoid

    Charging

    ECU control of the alternator. Without it the alternator charges at its own fixed setting; confirm in the service manual.

    • Alternator control

    Idle & accessories

    Electrical load, A/C, fans, switches. Tune idle around them, or wire them to spare I/O later.

    • A/C request
    • Brake switch
    • Clutch switch
    • Neutral switch
    • Power steering pressure switch

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Charge lamp
    • Fuel level
    • Malfunction indicator lamp (MIL)

    Emissions

    Emissions hardware. Usually deleted on race and off-road builds; may set a check-engine light or fail an inspection.

    • Charcoal canister purge
    • EGR boost solenoid
    • EGR valve
    • EGR valve

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • AMP EFI MS3Pro Mini35 pins · proposal
    26/47
    Engine 5Charging 1Idle & accessories 4Dash & gauges 3Emissions 7Power 12 out · 2 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • Front O2 heater
    • Knock sensor
    • VTCS solenoid (intake butterflies)
    • VTCS vacuum switch
    • VVT oil-control solenoid

    Charging

    ECU control of the alternator. Without it the alternator charges at its own fixed setting; confirm in the service manual.

    • Alternator control

    Idle & accessories

    Electrical load, A/C, fans, switches. Tune idle around them, or wire them to spare I/O later.

    • A/C request
    • Clutch switch
    • Neutral switch
    • Power steering pressure switch

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Charge lamp
    • Malfunction indicator lamp (MIL)
    • Tachometer output

    Emissions

    Emissions hardware. Usually deleted on race and off-road builds; may set a check-engine light or fail an inspection.

    • Charcoal canister purge
    • EGR boost solenoid
    • EGR valve
    • EGR valve
    • EGR valve
    • EGR valve
    • Rear O2 heater

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Link G4X MonsoonX34 pins · draft
    26/47
    Engine 4Charging 1Idle & accessories 4Dash & gauges 4Emissions 7Power 12 out · 0 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • ISC valve low side
    • VTCS solenoid (intake butterflies)
    • VTCS vacuum switch
    • VVT oil-control solenoid

    Charging

    ECU control of the alternator. Without it the alternator charges at its own fixed setting; confirm in the service manual.

    • Alternator control

    Idle & accessories

    Electrical load, A/C, fans, switches. Tune idle around them, or wire them to spare I/O later.

    • A/C request
    • Clutch switch
    • Neutral switch
    • Power steering pressure switch

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Charge lamp
    • Fuel level
    • Malfunction indicator lamp (MIL)
    • Tachometer output

    Emissions

    Emissions hardware. Usually deleted on race and off-road builds; may set a check-engine light or fail an inspection.

    • Charcoal canister purge
    • EGR boost solenoid
    • EGR valve
    • EGR valve
    • EGR valve
    • EGR valve
    • Rear O2 heater

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • MaxxECU STREET REV9+40 pins · proposal
    24/47
    Engine 5Charging 1Idle & accessories 5Dash & gauges 4Emissions 7Power 14 out · 2 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • Front O2 signal
    • Knock sensor
    • VTCS solenoid (intake butterflies)
    • VTCS vacuum switch
    • VVT oil-control solenoid

    Charging

    ECU control of the alternator. Without it the alternator charges at its own fixed setting; confirm in the service manual.

    • Alternator control

    Idle & accessories

    Electrical load, A/C, fans, switches. Tune idle around them, or wire them to spare I/O later.

    • A/C request
    • Brake switch
    • Clutch switch
    • Neutral switch
    • Power steering pressure switch

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Charge lamp
    • Fuel level
    • Malfunction indicator lamp (MIL)
    • Tachometer output

    Emissions

    Emissions hardware. Usually deleted on race and off-road builds; may set a check-engine light or fail an inspection.

    • Charcoal canister purge
    • EGR boost solenoid
    • EGR valve
    • EGR valve
    • EGR valve
    • EGR valve
    • Rear O2 heater

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • MaxxECU MINI REV10+30 pins · draft · 1 error
    20/47
    Engine 9Charging 1Idle & accessories 5Dash & gauges 4Emissions 7Power 12 out · 0 inDetails ▾

    Gives up (no free pin on this ECU)

    Engine

    Engine sensors and actuators (fuel, spark, triggers, cam/valve control). Check whether the new ECU needs each one: a second cam sensor, for example, is often optional, a VTEC or VVT solenoid is not.

    • Cam position (CMP)
    • Front O2 heater
    • Front O2 signal
    • ISC valve low side
    • Knock sensor
    • Main relay
    • VTCS solenoid (intake butterflies)
    • VTCS vacuum switch
    • VVT oil-control solenoid

    Charging

    ECU control of the alternator. Without it the alternator charges at its own fixed setting; confirm in the service manual.

    • Alternator control

    Idle & accessories

    Electrical load, A/C, fans, switches. Tune idle around them, or wire them to spare I/O later.

    • A/C request
    • Brake switch
    • Clutch switch
    • Neutral switch
    • Power steering pressure switch

    Dash & gauges

    Gauge and warning-light drives. The cluster may lose a gauge or a light.

    • Charge lamp
    • Fuel level
    • Malfunction indicator lamp (MIL)
    • Tachometer output

    Emissions

    Emissions hardware. Usually deleted on race and off-road builds; may set a check-engine light or fail an inspection.

    • Charcoal canister purge
    • EGR boost solenoid
    • EGR valve
    • EGR valve
    • EGR valve
    • EGR valve
    • Rear O2 heater

    Power

    Memory (battery-constant) feed. Only needed by ECUs with a keep-alive input.

    • Constant +12V

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

ECUs without a harness for this car

  • AMP EFI AMP PNP Miata NB2Plug-inPlug-in: mates the stock plugs pin-for-pin, no adapter harness
  • Link MX5NB2XPlug-inPlug-in: mates the stock plugs pin-for-pin, no adapter harness
  • AEM EMS 30-1042Not suitable · discontinuedPlug-in for Honda NSX NA1 1991-2005 (C30A) only; this car's stock plugs differ
  • AMP EFI AMP PNP Miata NA6Not suitablePlug-in for MX-5 Miata NA6 1990-93 (B6-ZE, 1.6) only; this car's stock plugs differ
  • AMP EFI AMP PNP Miata NA8 94-95Not suitablePlug-in for MX-5 Miata NA8 1994-97 (BP-ZE, 1.8) only; this car's stock plugs differ
  • AMP EFI AMP PNP Miata NA8 96-97Not suitablePlug-in for MX-5 Miata NA8 1994-97 (BP-ZE, 1.8) only; this car's stock plugs differ
  • AMP EFI AMP PNP Miata NB1Not suitablePlug-in for MX-5 Miata NB1 1999-00 (BP-4W) only; this car's stock plugs differ
  • MaxxECU C6 E38 Plug-inNot suitablePlug-in for Chevrolet Corvette C6 2005-13 (LS2/LS3/LS7) only; this car's stock plugs differ
  • Link CIVICLink K20XNot suitablePlug-in for RSX Type-S 2002-04 (K20A2) only; this car's stock plugs differ
  • Link E36XNot suitablePlug-in for BMW 3 Series E36 1990–2000 (M50/M52) only; this car's stock plugs differ
  • Haltech Elite 1500 HT-140960 (02-04 RSX PnP)Not suitablePlug-in for RSX Type-S 2002-04 (K20A2) only; this car's stock plugs differ
  • Haltech Elite 1500 HT-140961 (05-06 RSX PnP)Not suitablePlug-in for RSX Type-S 2005-06 (K20Z1) only; this car's stock plugs differ
  • ECUMASTER EMU Black PnP ECU2JZBNot suitablePlug-in for Toyota Supra A80 1993-98 USDM (2JZ-GTE, non-VVT) only; this car's stock plugs differ
  • ECUMASTER EMU Black PnP K20A2Not suitablePlug-in for RSX Type-S 2002-04 (K20A2) only; this car's stock plugs differ
  • Hondata FlashProNot suitablePlug-in for AP2 2006–09 (F22C1, DBW) only; this car's stock plugs differ
  • Link G4X AtomXNot suitableOnly on/off cam control; this engine needs variable cam timing
  • Link G4X S2000XNot suitablePlug-in for AP1 2000–03 (F20C), AP2 2004–05 (F22C1, cable) only; this car's stock plugs differ
  • rusEFI Hellen 125 Honda KNot suitablePlug-in for RSX Type-S 2002-04 (K20A2) only; this car's stock plugs differ
  • Hondata KPro4Not suitablePlug-in for RSX Type-S 2002-04 (K20A2) only; this car's stock plugs differ
  • AMP EFI MicrosquirtNot suitableNo cam control; this engine needs variable cam timing
  • MaxxECU Mustang 2011-14 plug-inNot suitablePlug-in for Mustang GT 2011–14 (Coyote 5.0) only; this car's stock plugs differ
  • Link MX5NAXNot suitablePlug-in for MX-5 Miata NA6 1990-93 (B6-ZE, 1.6), MX-5 Miata NA8 1994-97 (BP-ZE, 1.8) only; this car's stock plugs differ
  • Link MX5NB1XNot suitablePlug-in for MX-5 Miata NB1 1999-00 (BP-4W) only; this car's stock plugs differ
  • Link RX7XNot suitablePlug-in for Mazda RX-7 FD 1992-2002 (13B-REW twin-turbo) only; this car's stock plugs differ
  • Link SupraLinkNot suitablePlug-in for Toyota Supra A80 1993-98 USDM (2JZ-GTE, non-VVT) only; this car's stock plugs differ
  • Holley Terminator X MAXNot suitableNo cam control; this engine needs variable cam timing

Categories are read from the stock pin names and are a guide; each item shows its full stock name. Power and ground pins aren't compared, since every harness powers and grounds the ECU. Prices aren't considered. Always check the harness's own findings before building.