|
Re: Auto tranny acting wierd down hills.
Quote:
RoverGGM previously said:
Yes, just like the Brick pilot stated, the transmission is controlled by software called "Grade Logic".
To reduce gear "hunting" and unnecessary shifting, Grade Logic Control and Shift Hold Control systems are integrated into the shift programming of FJ automatic transmissions. Grade Logic Control alters the 5-speed automatic's shift schedule, reducing shift frequency while traveling uphill or downhill. Using inputs monitoring throttle position, vehicle speed and acceleration/deceleration, Grade Logic compares the operating parameters with a digital map stored in the transmission computer. When the system determines the FJ is on a hill, the shift schedule is adjusted to automatically hold the transmission in a lower gear for better climbing power or increased downhill engine braking.
Shift Hold Control prevents upshifts to higher gears (fourth and fifth) in repeated winding-road situations where the throttle is quickly released and the brakes are applied. This reduces disturbance to the chassis when entering a corner, and ensures strong power is available without a downshift. Shift Hold Control improves throttle responsiveness and reduces unnecessary shifting on curving roads.
|
I knew my FJ was smart. 
Hey Rover, your sig sounds like a Heinlein quote.
__________________
Grok FJ
NON supporting member
Take what man makes and use it,
But do not worship it,
For it shall pass.
If to do were as easy as to know what were good to do,
Chapels had been churches, and poor mans cottages, princes’ palaces.
Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats.
H. L. Mencken
Wesayso's mod up
'77 FJ40
'89 4Runner
'90 4Runner
'89 4Runner #2
|
