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Thread: e38 [ECM] 821 output

  1. 07-24-2022 #1
    yevgenievich
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    e38 [ECM] 821 output

    For e38 ecu, in vcm editor there is an option to enable this output. Is there a correlation on what pin on ecu it actually goes to? Would like to use this output, but could not find much information on it.

    [ECM] 821 - 128K PPM Wheel Speed Output: If enabled, the PCM rear wheel speed 128k PPM output will be enabled.
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  2. 07-24-2022 #2
    TheMechanic
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    On a Silverado that is X1 71 high, X1 72 is low.
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  3. 07-24-2022 #3
    yevgenievich
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    Quote Originally Posted by TheMechanic View Post
    On a Silverado that is X1 71 high, X1 72 is low.
    Thank you. Looking in to it further, found some more confirmation that it is pin 71 as well. But very specific to engine and rpo code. For gas v6 shows as replicated tos signal, while for diesel shows as vss
    Last edited by yevgenievich; 07-24-2022 at 04:14 PM.
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