You are incorrect. First, the Bosch ABS is actually awesome, the Bosch 5 more than the 2U, but either way I'll take the Bosch over the Delco any day of the week.
Second, the EBTCM on 94-95 Y-Bodies does not get a TPS signal from the PCM at all. They use a separate repeater module (called a "TPS Module") that takes the output voltage from the TPS, buffers it, then sends the buffered voltage reading to the EBTCM. This is so that the EBTCM reading the TPS doesn't affect the TPS signal going to the PCM. EDIT: It occurs to me that you may be having a separate thought here and you're no longer talking about Y-Bodies. If this is the case then I apologize; the above functionality is how Y-Body cars supply TPS data to the EBTCM (ABS/ASR).
Third, as already stated, the ASR (TCS) traction control request is sent to pin C12. The EBTCM merely has an internal switch that connects to +12V to tell the PCM it wants to retard timing for ASR. The PCM then determines how much retard to use and how long to do it for. So far from being just "B-Bodies," this is normal operation for all Bosch ABS vehicles (Y-Body, E-Body, K-Body, B-Body, D-Body).
No clue where you're getting your information from, but mine is from GM and Bosch directly.
To be perfectly accurate, it's the way all the Bosch-equipped cars did it, up to and including the '96 Y-Body.
C11, according to my FSMs, is connected to the Cruise Control Cutoff Relay, and is used to trigger the relay to cut out the cruise control when ASR is activated.
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