Quote:
Originally Posted by oni jake
edit: Came back after thinking about this. I realize we're not communicating about the same thing anymore. We're two dudes on the internet playing up to our imaginary stereotypes. In fairness, I apologize for sounding harsh. I'm terrible at the internetz, I just wanted a solid answer because you have trailed my last few posts.
You say the 3 channel system will work with a welded diff, I believe it will not. Where you say the 3 channel system is archaic and cannot physically detect a change in the vehicle braking dynamic through its 3 sensors, I say it can and was hoping you would prove that part specifically. From my understanding, ABS modules are programmed to handle a specific vehicle under specific conditions. Locking your rear end physically changes the braking dynamic. That in itself should be great enough for the ABS module to realize something is wrong and throw an error code. The FSM only explains how the sensors communicate with the ABS module (i.e. what you just posted).
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I believe it see's the rear axle as a single unit so it does not detect a difference in wheels speeds out back, just a difference of wheel speeds between the front and rear. I say archaic because it isnt an advanced system that see's and also monitors wheel speeds and fluid pressures at individual calipers like on newer ABS modules. It can only modulate the pressure at both rear calipers, with those pressures being identical at each caliper because of the single brake line that runs to the rear brakes. I'm not saying that the computer doesn't have the logic and algorithm's in it to account for both wheels, as it most likely has to, to send adequate fluid pressure to the brakes in the rear while also modulating the front wheels. However, locking those rear wheels, shouldn't push anything outside of those parameters because it still see's the same sine-wave from the rear differential, unless there is an issue with his sensor, or possibly the gearing changed, making the rear differential read outside of the typical tracking window the ABS ECU is accustomed too.