TRNW-2: TCM waveform on my scanner from a 08 Humer H3

[Chris and Cathy Kershaw]

Codes in the tcm or ecm? 12 volts at the trans connector?

On Wed, Aug 6, 2025 at 2:30 PM donnadan--- via trnw2 <trnw2 at trnw.net> wrote:

> Okay, now it's going into default again. I am thinking this used and
> recalibrated (for this VIN#) TCM is not working right. Any experience you
> guys might have with this would be welcomed.
>
> ------------------------------
> *From: *"TRNW2" <trnw2 at trnw.net>
> *To: *"TRNW2" <trnw2 at trnw.net>
> *Sent: *Saturday, August 2, 2025 3:21:37 PM
> *Subject: *TRNW-2: TCM waveform on my scanner from a 08 Humer H3
>
> Does anyone have an example of a scanner waveform, commanded and actual? I
> am getting hash when the amperage changes. I can't remember what this
> should look like. It came in under default, and I could not manually make
> the amperage change with the scanner, so I changed the TCM after testing
> the circuit through the PCS to TCM. It still kept setting PCS code and
> default, so I changed the solenoid from new style to old style, and it
> seems to work ok, but occasionally I still see the code, even though it is
> not going into default. Hope this makes sense.
>
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