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Thread: E38 ECM Wiring

  1. #1
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    E38 ECM Wiring

    So im doing a L98/6sp Manual swap into a E36 the dummy engine and transmission are mounted. The sump is off getting welded and once i get it back im going to start making my pipes.. So i thought id start working on getting the wiring sorted.

    The L98 runs a 52 tooth wheel on the crank so im pretty sure ive got the right ECM to do the job it is a e38 - SERV. NO 12603892. I also have the engine/transmission loom out of an automatic car, can this be modified to suite a manual? See pictures attached for the loom i have.

    There is a firewall grommet and then 2x connectors - i am guessing one is for the PCM as it is a auto loom. And the other connects to the dash harness? Is this where i need to patch into for the electronic throttle and OBD2 connection?

    At the moment i am missing the harness which plugs into the J1 Port - could someone shed some light as to what Commodores i could get it out of. Or does anyone have one?


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  2. #2
    Registered User ProVK's Avatar
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    Couple of options, buy a body harness from a series 2 VZ commodore to get the second ecu connector along with throttle pedal wiring etc or buy the connectors separate from eficinnections in the USA. I have done a fair amount of these wiring conversions using the e38 and l76/98 engines

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    Registered User Milkman Dan's Avatar
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    Mate give Justin a call on 0412 293 606

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    Sourcing the pigtails individually would probably be the cheaper option? - have you purchased any of the body harness what did it set you back?

    Going off the attached picture that i found on ls2.com from the J1 (i hope X1 is the same) i understand the following. (Please comment on any you know about)

    PIN

    1- Ignition Lock - NFI NOT NEEDED?

    6- Cruise Control Disable - NOT NEEDED BUT I WOULD LIKE TO PLAY WITH IT AFTER THE CONVERSION IS DONE

    8- Backup Lamp Switch Signal - NOT SURE? Is this the reverse lights switch?

    9 - Stop Lamp Switch Signal - BRAKE SWITCH FOR THE CRUISE?

    10- HO2S High Signal (Bank 1 Sensor 2) - OXY SENSOR

    11- HO2S Low Signal (Bank 1 Sensor 2) - OXY SENSOR

    12- A/C Refrigerant Pressure Sensor Signal - NEED THIS BECAUSE I AM KEEPING A/C

    13- Low Reference - NFI, IS THIS FOR A SENSOR GROUND OR SOMETHING?

    16- Fuel Level Sensor Signal (Primary) - IS THIS NEEDED? Matching up the fuel sender ohms would be a prick

    17- High Speed Cooling Fan Relay Control - NEGATIVE TRIGGER FOR FAN RELAY?

    18- TCM Accessory Signal - NFI WHAT IS THIS?

    19 - Ignition 1 Voltage - IM GUESSING THIS IS JUST A 12v+ IGNTION ON? DOES THIS NEED TO BE FUSED?

    20 - Battery Positive Voltage - CONSTANT 12v+?? WHAT FUES IS NEEDED?

    23- Low Reference - AGAIN NFI WHAT IS THIS?

    27- High Speed GMLAN Serial Data Bus- - NOW IS THIS CANBUS OR IS THIS FOR THE OBD2??

    28- High Speed GMLAN Serial Data Bus+ - NOW IS THIS CANBUS OR IS THIS FOR THE OBD2??

    29- APP Sensor 1 Signal - NFI WHAT THIS IS?

    30- Low Reference - NFI WHAT THIS IS?

    31- Low Reference - NFI WHAT THIS IS?

    32- APP Sensor 1 Signal - NFI WHAT THIS IS?

    34- 5-Volt Reference - FOR A SENSOR? BUT WHICH ONE? IS IT JUST A COMMON 5v RAIL USED ACROSS ALL SENSORS?

    36- 5-Volt Reference - FOR A SENSOR? BUT WHICH ONE? IS IT JUST A COMMON 5v RAIL USED ACROSS ALL SENSORS?

    37- IAT Sensor - INLET AIR TEMP SENSOR BUT I THOUGHT THIS CAME OFF THE OTHER LOOM?

    38- Low Reference - NFI WHAT THIS IS?

    41- MAF Sensor Signal - AIR FLOW METER BUT AGAIN I THOUGHT THIS CAME OFF THE OTHER LOOM?

    44- High Speed Cooling Fan Relay Control - NEGATIVE TRIGGER FOR THERMO FAN?

    47- Ignition 1 Voltage - IM GUESSING THIS IS JUST A 12v+ IGNTION ON? DOES THIS NEED TO BE FUSED?

    49- HO2S Low Signal (Bank 2 Sensor 2 ) - OXY SENSOR

    50- Fuel Pump Relay Control (Primary) - NEGATIVE TRIGGER FOR FUEL PUMP RELAY?

    52- Starter Relay Oil Control - NEGATIVE TRIGGER FOR STARTER RELAY - PUT IN PLACE TO AVOID STARTER KICKING WHILE ENGINE RUNNING?

    56- 5 Volt Reference - FOR A SENSOR? BUT WHICH ONE? IS IT JUST A COMMON 5v RAIL USED ACROSS ALL SENSORS?

    58- Low Speed Cooling Fan Relay Control - THERMO FAN RELAY NEGATIVE TRIGGER

    59 - Main Relay Control - NFI WHAT THIS IS??

    64 - HO2S Heater Low Control (Bank 2 Sensor 2) - OXY SENSOR

    65 - HO2S Heater Low Control (Bank 1 Sensor 2) - OXY SENSOR

    68 - MIL Control - NFI WHAT THIS IS??

    69- HO2S High Signal (bank 2 sensor 2) - OXY SENSOR

    70- Fuel Level Sensor Signal (Secondary) - IS THIS NEEDED? Matching up the fuel sender ohms would be a prick

    73 - Ground - FOR THE ECM






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  5. #5
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    Quote Originally Posted by AsYLuM View Post
    Mate give Justin a call on 0412 293 606
    Who is Justin and what does he do? /END ARNOLD

  6. #6
    are hairy dogsballs's Avatar
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    sideshow electronics, does lsx conversion loom etc
    Quote Originally Posted by 50RTD View Post
    Dave, have you uploaded the data from the carby?

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    Ahh thanks for that, But the plan is to do the job on my own, all the info is out there - i just need to piece it together.

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    Registered User Milkman Dan's Avatar
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    I'd buy a loom after wiring up plenty of cars..

    And btw if you don't want to tear the arse out of it look into strengthening where the subframe attaches to the body

  9. #9
    sack riding 10sec rx7's Avatar
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    good luck.. you will need it.. E38 is not a simple beast like the LS1 computer. even if you do get it to run you will probably not have a throttle and a few other things..
    im a cunt
    and apparently i dont know shit...

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    Quote Originally Posted by AsYLuM View Post
    I'd buy a loom after wiring up plenty of cars..

    And btw if you don't want to tear the arse out of it look into strengthening where the subframe attaches to the body
    Ill be welding in the M3 reinforcement plates as a minimum.. Going to look into it more when i do the Large Case conversion.

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    Quote Originally Posted by 10sec rx7 View Post
    good luck.. you will need it.. E38 is not a simple beast like the LS1 computer. even if you do get it to run you will probably not have a throttle and a few other things..
    Do you say that about the throttle because of the whole pedal/ecu/throttle body match up that is required?

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    Registered User Milkman Dan's Avatar
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    Quote Originally Posted by RotorBoy View Post
    Ill be welding in the M3 reinforcement plates as a minimum.. Going to look into it more when i do the Large Case conversion.
    May not be enough, blown m3s and I've even seen a 328 tear the arse end like a coke can.

  13. #13
    sack riding 10sec rx7's Avatar
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    Quote Originally Posted by RotorBoy View Post
    Do you say that about the throttle because of the whole pedal/ecu/throttle body match up that is required?
    That's the easy part of it.. If you don't know what your doing send it all to Justin as you won't get it working. Took us a long time to get it all nailed and working as it should..
    im a cunt
    and apparently i dont know shit...

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    Yeah well I wouldn't say I know what I'm doing, this isthe first ls loom I've ever played with.

    With that said, ill never know what I'm doing unless I give it a go.

    Asylum - any idea on what the go is to tuffen the rear up beyond the m3 plates?
    I haven't looked at the rear end much at all to.work out the mounting points but I was thinking maybe a brace that goes across the rear shocker towers and then pins down to some added plates on the subframe mounting points in the boot floor.

  15. #15
    Registered User Milkman Dan's Avatar
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    Quote Originally Posted by RotorBoy View Post
    Yeah well I wouldn't say I know what I'm doing, this isthe first ls loom I've ever played with.

    With that said, ill never know what I'm doing unless I give it a go.

    Asylum - any idea on what the go is to tuffen the rear up beyond the m3 plates?
    I haven't looked at the rear end much at all to.work out the mounting points but I was thinking maybe a brace that goes across the rear shocker towers and then pins down to some added plates on the subframe mounting points in the boot floor.
    See if BMW will give you details on the service bulletin as they were doing warranty & out of warranty fixes on this a few years back. It involved welding decent plates in the back, ill try dig up the pics I had of one being done.

  16. #16
    sack riding 10sec rx7's Avatar
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    Quote Originally Posted by RotorBoy View Post
    Yeah well I wouldn't say I know what I'm doing, this isthe first ls loom I've ever played with.

    With that said, ill never know what I'm doing unless I give it a go.
    not being a cunt but you dont even know how many teeth are on the reluctor wheel in the motor so setting a electronic throttle engine harness and ecu up is not something that should be taken too lightly..
    im a cunt
    and apparently i dont know shit...

  17. #17
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    Not cunt at all...

    I knew it was in the 50 range and not the 20...... So I'm nearly there...

    It's all a learning experience mate, you can be sure I won't get that one wrong again

  18. #18
    sack riding 10sec rx7's Avatar
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    the wheel on the motor is a 60-2 standard motronic wheel, thats why people say they have 58 teeth.

    ill get a price on getting it all done for you and you can work out if you want to fuck around with it or get it done so you just have to hook up 4 or 5 wires to your car..
    im a cunt
    and apparently i dont know shit...

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    Sweet - let me know

    Does anyone have any light to shed on the subject?
    PoVK?

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    Pin 9 - Stop Lamp Switch Signal - This needs to be 12v+ constant and an open circuit when the brake is pressed


    Now with the Low Reference wires - Can these all just be joined up as a common ground OR do they need to be references back to the circuit they originate from and then wired to the corresponding sensor?

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    Now this diagram is extremely useful as it shows the that the Low Reference wires are paired up to specific sensors

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    Wiring for the Heater Oxy Sensors.

    Im thinking it would be possible to trigger the relays powering the O2's using the X1-59 Main Relay Control ?

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  23. #23
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    Pressure and Temp Sensors

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    Last edited by RotorBoy; 10-02-13 at 11:41 AM.

  24. #24
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    Throttle Controls

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    Do the custom looms also fuse the two injector banks separately?

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    So the coil power source is split into two banks and fed from the same two fuses that power the injectors.

    Again do i trigger these relays with the X1-59 Main Relay Control feed? or do i just not bother using PIN 59 to trigger all the relays and just use a ignition power source from the BMW loom?

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    This includes the details for the DOD equipment - that will all be ignored in my case.

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  28. #28
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    This diagram explains the Fuse Block and confirms my thinking that PIN 59 triggers the relay powering the Injectors/Coils ect...

    It shows PIN 68 as the ground trigger for a check engine light. and answers the question about what fuses PINS X1 19/20 should be running

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  29. #29
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    Now this is for the OBD Port

    pin 4 and 5 are grounded
    Pin 6 has continuity to pin 28 on ECM
    Pin 14 has continuity to pin 27 on ECM
    Pin 16 is B+

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    Last edited by RotorBoy; 10-02-13 at 01:26 PM.

  30. #30
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    Also could someone clarify what is done with the VSS because i am running a manual? Has anyone here done the E38 stand alone with a manual?
    If i use HP Tuners is it as simple as wiring the VSS into pins 71 and 72 on the X1 connector?

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