Found it, was a ETC rpm limiter, not very much scanning capability on these tcms :/
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Found it, was a ETC rpm limiter, not very much scanning capability on these tcms :/
What are you using to get a RPM signal to the PCM? What does battery voltage look like? I'd check for good grounds and make sure the trans has a ground coming off it to the frame. i believe those trucks were very picky about that.