e 36 tds installed in another vehicle - trying to identify the ecu revs output/signal wire or terminal

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  1. e 36 tds installed in another vehicle - trying to identify the ecu revs output/signal wire or terminal 
    #1
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    llewellyn's Car Details
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    Made an error transpalnting the engine into another vehicle and failed to record which ECU wire supplied the tacho. It is an e36 tds, all of the ecu wires are present, but only those necessary to run the engine remain connected (not an easy task !). I am now working out how to run a signal to another tachometer-so am trying to identify either the ecu revs signal wire colour, or the corresponding number on the big multiplug loom connector mounted on the fusebox body. It was the earlier TDS with the alloy inlet manifold..... absolutely no idea how to identify it, being a total diy er who did not use wiring diags to remove and relocate the engine using plodding logic only and trial and error....so any help VERY welcome !

    llewellyn
     
     

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    TheEnd's Car Details
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    Have you got the original engine loom that goes to the X20 round plug?

    This would be the plug that links the engine to the car, and it is pin 20 on that plug
    X20 Connector pins
     
     

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    llewellyn's Car Details
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    ah great yes, i have full bmw engine bay standard installation and loom, albeit a lot of wires rolled up/ capped but still present. So i have what you refer to as the x20 round plug - from memory (its raining...again) there are two big round plugs together on a bracket - i will check tomorrow for pin 20.

    great/ many thanks
     
     

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    Well, one round plug will probably be the diagnostic connector, and it'll have a cap on the top if it hasn't been lost.
    In the middle is a Pac man shaped hole, a round hole with a triangle jutting into it.

    The X20 should have a triangular centre locating dowel/pin.

    Look closely at the connector, and you'll see they will have tiny numbers moulded next to each pin.
    It'll be on pin 20, a black wire, with a thick green wire next to it.
     
     

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    sorry another related question - I see pin 14 is the speedo output. Do you know if the signal is generated from the gearbox to the ecu and on to the speedo via pin 14, (in which case maybe I still have an output i can use for a speedo) or did the signal come from somewhere else ( BMW back axle sender???) in which instance, its gone/ only the engine and box have been transplanted and there will be no output from pin 14. BUT...if the speed input to the ecu came from the gear box, maybe i can use it.......
     
     

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    It's the other way, the speed signal comes from the sender in the diff, and that is the wire heading into the ECU.
     
     

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    thanks both,

    will work out how to power up a smiths tachometer from the BMW ecu output pin 20 - I will probably need to amplify it in some way mindful the smiths would have run from an induction coil proximity loop coming from the coil. and will have to find another way of recording speed !

    thanks

    Llewellyn
     
     

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