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any way to run an electric speedo without the ecm?

Discussion in 'The Garage' started by mpascino, May 1, 2004.

  1. mpascino

    mpascino 1/2 ton status

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    Trying to revive the 91 burb after rebuilding the motor. It's a diesel and I am trying to eliminate the rats nest of a wiring harness. Does anyone know of any way to use the factory electric speedo without using the ecm? I'd rather not convert everything to a mechanical setup..... Any info or wiring diagrams any one may have is appricated. Thanks,
    Mike
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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    If it's a diesel, it doesn't have an ECM, right?

    Just trying to figure this out. If it's a 90-91 diesel, the "ECM" is probably ONLY there to run the speedo, and a few other things like cruise, etc. Still entirely mechnical injection right?
     
  3. mpascino

    mpascino 1/2 ton status

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    There is like 2 million wires comeing out of the ecm. It is mechanical injection. I should technically only need two wires to run the motor. The harness under the hood is an absolute mess. I assume the ecm mainly runs the emissions controls that didn't do much and are no longer there since the turbo install. The truck supposedly has the " antilock " electronic rear brakes that don't do anything either. I suppose those are ran through the ecm as well... I'd go as far as to installing an aftermarket module for the speedo before I reinstall the nest again..
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    Thought ABS was under the master cylinder on these trucks? Or is that just a part of it?

    Oh well, I'm interested in hearing what all electric stuff the later diesels had on them, I never thought about the 90-91's.
     

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