tranny kickdown cable

[SAYWHAT]

Owner of a 1996 4runner says automatic tranny will not shift up into 3rd because of faulty kickdown cable. Reverse,1st and 2nd are fine. Any knowledge as to this kickdown cable. Thanks

 

[Ruiner]

Owner of a 1996 4runner says automatic tranny will not shift up into 3rd because of faulty kickdown cable. Reverse,1st and 2nd are fine. Any knowledge as to this kickdown cable. Thanks

its the cable that goes from your throttle body to your transmission

 

[gamefreakgc]

Yeah, these are cable-driven vehicles, not electronically controlled.

Chances are the transmission cable is just too tight or too loose. Loosen the lock nuts on the plenum that hold the cable housing end and re-adjust as necessary. Might look a little different since my rig is supercharged.

 

[Doc2012]

Yeah, these are cable-driven vehicles, not electronically controlled.

Um, WRONG.


How Would the tranny kick DOWN cable, have ANY effect of it shifting up?



The Tranny kick DOWN cable is just for that. You step on the gas, WOT, and it kicks the trans DOWN in gear, so that it accelerates faster.


If it's not shifting UP, then you're looking at problems with your transmission. NOT your kick DOWN cable.

More than likely your transmission solenoids, or you have other problems.

 

[SAYWHAT]

Makes sense DOC, thanks

 

[gamefreakgc]

He asked about the cable, so I gave info about the cable. The transmission is run by the ECU but figured he already knew that. Newer vehicles are 100% electronically controlled where ours still relies on the cables for throttle position.

 

[jeremyc74]

Um, WRONG.


How Would the tranny kick DOWN cable, have ANY effect of it shifting up?



The Tranny kick DOWN cable is just for that. You step on the gas, WOT, and it kicks the trans DOWN in gear, so that it accelerates faster.


If it's not shifting UP, then you're looking at problems with your transmission. NOT your kick DOWN cable.

More than likely your transmission solenoids, or you have other problems.

The cable is what tells the transmission how much throttle you're giving it. If it's adjusted too tight it will hold it in a lower gear longer because it thinks you're hammering the throttle. Not shifting up properly is a common symptom of a misadjusted cable.

Now, the question is.... is it possible for it to stop it from shifting completely? That I don't know. If you run it up to redline it should shift regardless of throttle position.

OP, does it hold first gear longer than it should?

 

[Doc2012]

Then why do people disconnect the kick down cable, and suffer no drive ability symptoms?

It's called a kick down cable because when you stomp the gas, that tells the trans to drop a gear or two.

All a tight kick down cable is goin to do is make the RPMs higher, maybe make the gears hang a little higher in the RPM, but it's not going to stop the trans from shifting into third or fourth gear.

You've got other problems besides a tight kick DOWN cable.

 

[19963.4lsr5]

A lot of people call it the TV cable. (Throttle Valve). And on the runner I thought the cable only controlled line pressure. The trans control module uses the TPS to select which solenoid to energize for gear selection, overdrive, and lockup clutch in the torque converter.

 

[jeremyc74]

Then why do people disconnect the kick down cable, and suffer no drive ability symptoms?

It's called a kick down cable because when you stomp the gas, that tells the trans to drop a gear or two.

All a tight kick down cable is goin to do is make the RPMs higher, maybe make the gears hang a little higher in the RPM, but it's not going to stop the trans from shifting into third or fourth gear.

You've got other problems besides a tight kick DOWN cable.

It's not called a "kick down cable", that's a nickname for it. It's a throttle valve cable. The kickdown is just part of what it does.

Does your transmission upshift at the same point at half throttle and full throttle? No, it doesn't. The way it alters the shift point is through the pressure modulation caused by the throttle valve on the other end of the kickdown cable. A vehicle with the cable disconnected will upshift early.

You don't have to take my word for it though. This same information is all over the internet.

Throttle Valve Adjustment

The Throttle Valve Cable is attached to the throttle linkage. When the throttle is depressed, the cable is "pulled" progressively with throttle position. In addition to providing forced downshifts (kickdown), and progressively later (higher speed) upshifts at higher throttle settings, the throttle valve also adjusts main line pressure in the transmission. Operating a transmission with the TV cable out of adjustment, can, not only produce early, or late upshifts, but incorrect line pressure, as well. What this means, in simple terms, is that TV pressure that is too low, will produce main line pressure that is also too low, and will eventually "burn" the transmission clutches.

 

[Dous]

Yea mine is not even connected. I pulled it all the way tight and ziptied it there. I wanted as much firmness as possible in the trans shifts

 

[19963.4lsr5]

Shifting is done electronically on the A340/AW4

On a 727, 904, 999, TH350, TH400 etc the TV adjustment yes.

There is no connection I know of that connects the TV in the trans with the shift solenoids operated by the TCU.

 

[SAYWHAT]

Sorry guys, its a vehicle that I am interested in buying but is two hours away and have not personally seen it yet. If I purchase it I will have the option of doing a body swap with my rolled over 1998 or swapping drive train parts as needed. Just trying to figure if the tranny might have some value if needed.