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Which ECU for the BMW 3 Series E36 1990–2000 (M50/M52)?

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 39” counts the stock functions at least one ECU here wires.

Most complete

AMP EFI MS3Pro Ultimate

Can carry 39 of 39 stock functions, with 13 spare outputs and 18 spare inputs left.

Smallest that keeps every engine function

Haltech Elite 2500 HT-151300

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

Most room for add-ons

MaxxECU PRO REV10+

39 spare outputs and 29 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
    39/39
    Gives up nothing13 out · 18 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

  • MaxxECU PRO REV10+155 pins · proposal
    38/39
    Power 139 out · 29 inDetails ▾

    Gives up (no free pin on this ECU)

    Power

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

    • Battery voltage (constant +12V)

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Emtron KV16120 pins · draft
    38/39
    Power 127 out · 26 inDetails ▾

    Gives up (no free pin on this ECU)

    Power

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

    • Battery voltage (constant +12V)

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Emtron KV12115 pins · draft
    38/39
    Power 123 out · 26 inDetails ▾

    Gives up (no free pin on this ECU)

    Power

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

    • Battery voltage (constant +12V)

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Emtron KV8106 pins · draft
    38/39
    Power 115 out · 26 inDetails ▾

    Gives up (no free pin on this ECU)

    Power

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

    • Battery voltage (constant +12V)

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • AMP EFI MS3Pro EVO+89 pins · proposal
    38/39
    Power 113 out · 18 inDetails ▾

    Gives up (no free pin on this ECU)

    Power

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

    • Battery voltage (constant +12V)

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • AMP EFI MS3Pro EVO+ HC89 pins · proposal
    38/39
    Power 113 out · 18 inDetails ▾

    Gives up (no free pin on this ECU)

    Power

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

    • Battery voltage (constant +12V)

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Emtron Shadow 868 pins · draft
    38/39
    Dash & gauges 18 out · 15 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

  • Emtron SL866 pins · draft
    38/39
    Power 16 out · 12 inDetails ▾

    Gives up (no free pin on this ECU)

    Power

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

    • Battery voltage (constant +12V)

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Haltech Elite 2500 HT-15130060 pins · proposal
    38/39
    Power 17 out · 8 inDetails ▾

    Gives up (no free pin on this ECU)

    Power

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

    • Battery voltage (constant +12V)

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Emtron SL662 pins · draft
    38/39
    Power 12 out · 12 inDetails ▾

    Gives up (no free pin on this ECU)

    Power

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

    • Battery voltage (constant +12V)

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • MoTeC M190 13190136 pins · proposal
    37/39
    Engine 1Dash & gauges 132 out · 34 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.

    • Ignition switch (terminal 15)

    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

  • ECUMASTER EMU PRO 16120 pins · draft · 1 error
    37/39
    Engine 1Power 129 out · 29 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.

    • Camshaft position sensor (Hall)

    Power

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

    • Battery voltage (constant +12V)

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • MoTeC M150 13150120 pins · proposal
    37/39
    Engine 1Dash & gauges 120 out · 34 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.

    • Ignition switch (terminal 15)

    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

  • MaxxECU GEN2 RACE136 pins · proposal
    37/39
    Dash & gauges 1Power 124 out · 24 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.

    • Battery voltage (constant +12V)

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • rusEFI Proteus93 pins · proposal
    37/39
    Dash & gauges 1Power 118 out · 16 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.

    • Battery voltage (constant +12V)

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • MaxxECU GEN2 TRACK93 pins · proposal
    37/39
    Dash & gauges 1Power 112 out · 14 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.

    • Battery voltage (constant +12V)

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Haltech Nexus S3 HT-21300068 pins · proposal
    37/39
    Dash & gauges 1Power 18 out · 11 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.

    • Battery voltage (constant +12V)

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • MaxxECU RACE REV9+80 pins · proposal
    37/39
    Engine 1Power 110 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.

    • Ignition switch (terminal 15)

    Power

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

    • Battery voltage (constant +12V)

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • MoTeC M170 1317066 pins · proposal
    37/39
    Engine 1Dash & gauges 14 out · 12 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.

    • Ignition switch (terminal 15)

    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 M130 1313060 pins · proposal
    37/39
    Engine 1Dash & gauges 14 out · 11 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.

    • Ignition switch (terminal 15)

    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

  • ECUMASTER EMU Black63 pins · proposal
    37/39
    Dash & gauges 1Power 13 out · 9 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.

    • Battery voltage (constant +12V)

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Link G4X XtremeX 109-400067 pins · proposal
    36/39
    Engine 1Dash & gauges 1Power 16 out · 17 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.

    • Ignition switch (terminal 15)

    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.

    • Battery voltage (constant +12V)

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Link G4X FuryX 122-400068 pins · proposal
    36/39
    Engine 1Dash & gauges 1Power 15 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.

    • Ignition switch (terminal 15)

    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.

    • Battery voltage (constant +12V)

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • Link G4X StormX 108-400060 pins · proposal
    36/39
    Engine 1Dash & gauges 1Power 14 out · 13 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.

    • Ignition switch (terminal 15)

    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.

    • Battery voltage (constant +12V)

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • MoTeC M800 universal60 pins · proposal
    34/39
    Engine 3Dash & gauges 1Power 12 out · 12 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.

    • Ignition switch (terminal 15)
    • Knock sensor cylinders 1-3
    • Knock sensor cylinders 4-6

    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.

    • Battery voltage (constant +12V)

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • MaxxECU SPORT REV9+48 pins · proposal
    34/39
    Engine 3Dash & gauges 1Power 11 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.

    • Ignition switch (terminal 15)
    • Knock sensor cylinders 1-3
    • Knock sensor cylinders 4-6

    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.

    • Battery voltage (constant +12V)

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

  • MaxxECU STREET REV9+40 pins · proposal
    31/39
    Engine 4Dash & gauges 2Emissions 1Power 10 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.

    • Ignition switch (terminal 15)
    • Knock sensor cylinders 1-3
    • Knock sensor cylinders 4-6
    • VANOS intake camshaft solenoid

    Dash & gauges

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

    • Check engine light (MIL)
    • Tachometer output

    Emissions

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

    • Evap purge solenoid

    Power

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

    • Battery voltage (constant +12V)

    Not wired yet, but it has free pins for

    —

    Open harness → · Spare I/O

ECUs without a harness for this car

  • Link E36XPlug-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
  • AMP EFI AMP PNP Miata NB2Not suitablePlug-in for MX-5 Miata NB2 2001-05 (BP-Z3, VVT) 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
  • 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
  • Haltech Elite 1500 HT-150900Not suitableOnly 4 ignition outputs; the engine has 6
  • 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 4 ignition outputs; the engine has 6
  • Link G4X MonsoonXNot suitableOnly 4 ignition outputs; the engine has 6
  • 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
  • MaxxECU MININot suitableOnly 4 ignition outputs; the engine has 6
  • AMP EFI MicrosquirtNot suitableOnly 2 ignition outputs; the engine has 6
  • AMP EFI MS3Pro MiniNot suitableOnly 4 ignition outputs; the engine has 6
  • 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 MX5NB2XNot suitablePlug-in for MX-5 Miata NB2 2001-05 (BP-Z3, VVT) 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
  • Emtron SL4Not suitableOnly 4 ignition outputs; the engine has 6
  • SpeeduinoNot suitableOnly 4 ignition outputs; the engine has 6
  • 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 suitableSold only as V8 engine kits (LS, Hemi, Ford) with fixed trigger patterns; no Subaru, Honda or Mazda support found

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.