I just looked at the tech edge diagrams in detail, everythin looks fine a dandy except I did not notice a coupling capacitor to couple the 3 khz AC signal to sense the Nermest resistance, the "VsDrive" connection connects through a resistance (910 ohms) to pin 11 of the atmel8 AVR MCU, if you are coupling an AC signal of 0v to 5v then for the bosch lsu you would need something in the 10k range and also a capacitor. Also Pin 11 of the atmel8 AVR is not a PWM pin, if he is ouputing an AC signal he must be doing it via software.

I am thinking that the TE unit actually powers off the sensor and does DC sensing of the the resistence in the nermest cell, which would make the unit super slow.

I am jsut puzzled because no where on the schematic are any hallmarks of generating an ac signal, coupling an ac signal into the nermest cell, or low pass filtering to target a signal in the 3khz range. The only filtering around the VS port are low pass filters with a 3bd freq of about 10khz.