s80 automatic transmission info for 'manual' shifting

[precopster]

If the TCM doesn't receive proper input from engine sensors it may go into limp mode meaning take-off in 2nd gear and no gear changes. Wouldn't that be ideal for an electric engine?

[kcodyjr]

If that allows ninjatronic "manual" shifts, then yes it would seem to be ideal, except for turning on the idiot light.

Does the TCM really monitor all the ECU sensors directly, or does the ECU send a "condition green" signal to the TCM somehow?

[jimmy57]

TCM gets a load of info off network:
all wheels speeds from ABS (only front two are important), ABS function status
brake apply from CEM from brake pedal switch
engine load, throttle position, RPM, coolant temp, and some other less important stuff from ECM

TCM has mapping and throttle percent sets a target, load sets a pressure to handle shifts with correct pressure for comfort and no slip, RPM VS load defines normal output or increasing altitude (modifies mapping), coolant temp is used to trigger delayed shift for catalysts warming.

THe electric motor controller would have to provide some of this data and I can't imagine the TCM's mapping won't have to be changed.

The transmission has two shift solenoids, one pressure regulator valve, and a torque converter clutch solenoid.
Solenoid chart:

Gear sol1 sol2
1st 1 1
2nd 0 1
3rd 0 0
4th 0 1

pressure reg solenoid is PWM controlled
TCC solenoid is PWM and then full on. The Period pf PWM can be very brief to smooth locking or can be feedback controlled for "slipping lock up" to achieve a 50-100 rpm slip between eng rpm and trans input rpm for reduced engine coarseness when TCC is locked at low RPM to override high stall speed of TC.