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Engine Wiring Harness Connectors

From MS4X Wiki

Here is an overview of connectors used in the engine harness of M52TU and M54.

Feel free to add partnumbers if you find them useful.

Sensor Connectors

BMW M54 Crankshaft Sensor
  • ECU Side: Kostal 3 Way Sealed SLK 2,8 Black Female Connector (Coding A) - 09-4413-91 // 9441391
    • Pin: Female SLK 2,8 Sealed Tin Plated Terminal 0.5-0.75mm² - 22140492060
    • Seal: Individual Loose Cable Seal SLK 2,8 Series 1.5-2.5mm² - 10800444523
  • Sensor Side: Kostal 3 Way Sealed SLK 2,8 Black Male Connector (Coding A) - 1-968408-2 //
    • Pin: Male SLK 2,8 Sealed Silver Plated Terminal 0.5-0.75mm² - 10124499140
    • Seal: Individual Loose Cable Seal SLK 2,8 Series 1.5-2.5mm² - 10800444523
Pin 1 M_KWG (Sensor Ground)
Pin 2 P_KWG (Crankshaft Sensor Signal Output)
Pin 3 U_HR (+12V Voltage Input)
BMW M54 MAF Sensor (MS43)

3-pin Junior Mini Timer 2.8mm

Plug: 12521427222 (BMW)

Pin: 12521427612

Cover: 12521707749

Pin 1 M_HFM (Sensor Ground)
Pin 2 A_HFM (MAF Signal Output)
Pin 3 U_HR (+12V Voltage Input)
BMW M54 MAF Sensor (MS45)

Plug: 12527512935 (BMW) (Sealing grommet to go with the plug is part # 61138366245)

Pin: 12527545852

Pin 1 +5V Voltage Input?
Pin 2 +12V Voltage Input?
Pin 3 A_HFM (MAF Signal Output)
Pin 4 Unused
Pin 5 M_HFM (Sensor Ground)
Pin 6 IAT Sensor Output
BMW B58 TMAP Sensor (13628637900)

Plug: 18302411427 (BMW) (8 509 441-02)

AliExpress: 7549032-02

Pin 1 A_TNDK (Temperature Signal After Throttlebody)
Pin 2 U_5V_2 (Sensor Supply Voltage +5V)
Pin 3 M_PNDK (Sensor Ground)
Pin 4 A_PNDK (Absolute Pressure Signal After Throttlebody)
Audi RS4 MAF Sensor (0280218067)

Also matches S4 B5 MAF sensor

  • Plug: 1J0973775A (VAG)
  • Socket: 1J0973824 (VAG)
Pin 1 IAT Sensor Output
Pin 2 +12V Input Voltage
Pin 3 Common Ground
Pin 4 +5V Input Voltage
Pin 5 MAF Sensor Output
Bosch MAP Sensor 20-300kPa (0261230119)

3-pin Bosch Compact 1.1a 2.8mm

  • Plug: Bosch 1928403966
  • Pin: Bosch 1928498056
  • Cover: Bosch 12521707749
Pin 1 +5V Voltage Input
Pin 2 Ground
Pin 3 Signal Output
Mercedes M275 MAP Sensor (Bosch 0261230191)

Alternative Part Number: 0051537228

  • Plug: BMW 61132359998 / TE 1-968402-1
Pin 1 +5V Voltage Input
Pin 2 Signal Output
Pin 3 Ground
BMW M52TU M54 Lambda Sensor Connectors

These connectors describe the probe side. ECU wiring side is exactly the other connector.

Pre Catalytic Converter Lambda Probe:

  • Housing: BMW 12521740485
  • Pin: BMW 1732373
  • Sealing: BMW 1427785
  • Cable Protection: BMW 12521703593

Pre Cat Lambda Sensor Connector.png


Post Catalytic Converter Lambda Probe :

  • Housing: BMW 12521740486
  • Pin: BMW 1703596
  • Sealing: BMW 1427785
  • Cable Protection: BMW 12521703593

Post Cat Lambda Sensor Connector.png

Throttle Body Connectors

BMW M54 Throttle Body

Plug: 1J0973713 (VAG) / 12527505669 (BMW)

Socket: 3B0973813 (VAG)

Pin 1 A_DKG1 (Potentiometer 1)
Pin 2 U_DKG (Sensor Supply Voltage +5V)
Pin 3 T_MDK1 (Actuator 1)
Pin 4 A_DKG2 (Potentiometer 2)
Pin 5 T_MDK2 (Actuator 1)
Pin 6 M_DKG (Sensor Ground)
BMW B58 Throttle Body (13548623324)

The B58 throttle body adapts perfectly to MS43 and can therefore be used on a B58 manifold that has been adapted for use on an M5X engine.

Plug: 12527635615 (BMW)

Pins: 61138600419 (BMW)

Pin 1 T_MDK1 (Actuator 1)
Pin 2 T_MDK2 (Actuator 2)
Pin 3 A_DKG1 (Hall Sensor 1)
Pin 4 M_DKG (Sensor Ground)
Pin 5 U_5V_1 (Sensor Supply Voltage +5V)
Pin 6 A_DKG2 (Hall Sensor 2)