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[M73 wiring diagram ](BMW_e38_750 )
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~6 wires are different between [Proteus 0.2 ](https://github.com/rusefi/rusefi/wiki/Hardware_Proteus_Wiring_v02 ) and [Proteus 0.3 ](https://github.com/rusefi/rusefi/wiki/Hardware_Proteus_Wiring_v03 )
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This HOWTO is focusing on M73 engine with stock ECU harness. 1998 stock ECU harness has two 134 pin connectors.
On my 1998 first set of 9+24+52+40+9=134 pins total is BLACK.
Second set of 9+24+52+40+9=134 pins total is GREY.
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rusEFI uses six wire colors: black white red orange green blue.
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# Proteus
* +12 from main relay
* x12 injectors
* CLT
* IAT
## Black 35 Pin 776231-1
|Pin Number|Name | Type ID | Default function | rusEFI color | Destination |
| ---:|:------------- | ----- |:------------------------------------ |--------- | --- |
| 3 |**Lowside #1 ** | ls | Injector #1 | |
| 4 |**Lowside #3 ** | ls | Injector #3 | |
| 5 |**Lowside #5 ** | ls | Injector #5 | |
| 6 |**Lowside #6 ** | ls | Injector #6 | |
| 7 |**Lowside #7 ** | ls | Injector #7 | |
| 8 |**Lowside #9 ** | ls | Injector #9 | |
| 9 |**Lowside #11 **| ls | Injector #11 | |
| 10 |**Lowside #13 **| ls | low-side output: main relay | Blue | Black plug #2 23/24 BRN/BLK |
## Black 23 Pin 776228-1
|Pin Number|Name | Type ID | Default function |rusEFI color | OEM connector |
| ---:|:---------- | ----- |:------------------------------------ | :--------- | --- |
| 18 | +12 raw | 12v | ignition power / ECU power source | Red | Black plug #4 26/40 GRN/BLK |
| 19 | **GND** | y | Power GND | Black | Black plug #1 6/9 BRN |
| 23 | +12V mr | 12v | ETB/high-side power supply from main relay | Red | Black #1 8/9 RED/BLU |
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# 9 pin plug #1
| Pin | type | OEM color | Description | rusEFI color |
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|---|---|---|---|---|
| | | | | |
| | | | | |
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| | | | | |
# 24 pin plug #2
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| Pin | type | OEM color | Description | rusEFI color |
|---|---|---|---|---|
| | | | | |
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# 52 pin plug #3
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| Pin | type | OEM color | Description | rusEFI color |
|---|---|---|---|---|
| | | | | |
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# 40 pin plug #4
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| Pin | type | OEM color | Description | rusEFI color |
|---|---|---|---|---|
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| 6| IN | | start signal from ignition key |
| 17| OUT |BLK | engine speed output for gauge cluster
| 26| IN |GRN/BLK| RED +12v hot in start & run
| 40| OUT |YEL/BRN |BRN starter enable
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| | | | | |
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# 9 pin plug #5
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| Pin | type | OEM color | Description | rusEFI color |
|---|---|---|---|---|
| | | | | |
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![ecu1 ](oem_docs/Bmw/1998_750_e38/BMW-134.jpg )