hesitation into 4th gear AT - Toyota Yaris Forums

samus11 · 12-18-2012, 03:50 PM

I've got an 08 Yaris Liftback-automatic trans with ~20,000 miles on it. Love the car, and have had no issues so to speak of.

One concern I have has to do with it sometimes taking a while to shift out of 3rd to 4th. Occasionally it will not shift until almost 60mph (compared to it's usual shifting around 40-45). At this speed, the noise is considerably louder the shift feels rougher.

I don't have a scanguage or a tach to provide any more info. Any reason it would be doing this? Any remedies?

david_827 · 12-18-2012, 04:24 PM

is it having this issue when the "COOl" light is on on the dashboard???? This sometimes happens to me when i try to push my car before it warms up.

CTScott · 12-18-2012, 04:50 PM

The Yaris prohibits 4th gear until the AT fluid and engine coolant reach a threshold (which is typically when the green "cool" light goes out, as the coolant takes longer to heat up than the AT fluid does).

If you are interested in being able to override that behavior, I figured out how to do so using just a switch and a resistor:

http://www.yarisworld.com/forums/showthread.php?t=37691

samus11 · 12-18-2012, 05:04 PM

It does happen mostly at the beginning of drives, but I feel like I've experienced it after the green "cool" light has gone off.

Maybe I'm just going crazy.

Golddeenoh · 12-18-2012, 05:52 PM

the green light goes out at 130 degrees Fahrenheit normal operating temperature is between 184 and 194 degrees Fahrenheit. the oils will warm up before the coolant get that hot, the question is are you getting everything hot enough, long enough to operate properly? how long do you typically drive in one outing? if you drive less than about 10 miles in one direction then the engine and trans operating temperature has not been reached and the system safety precautions will not allow the trans to sift into higher gear. this is done to prevent strain on the engine which can cause premature ware and failure.

MadMax · 12-18-2012, 08:22 PM

Yep, even with the 'cool' light off I still find it takes a while for the transmission to warm up sufficiently to shift into OD (4th).

Unless this is happening after you've driving for a while (5-10 minutes) then it is completely normal.

By the way, where are you in the great state of Texas?

Cheers! M2

12-18-2012, 03:50 PM	#1
samus11 Drives: 08 Yaris Join Date: Sep 2012 Location: Texas Posts: 2	hesitation into 4th gear AT I've got an 08 Yaris Liftback-automatic trans with ~20,000 miles on it. Love the car, and have had no issues so to speak of. One concern I have has to do with it sometimes taking a while to shift out of 3rd to 4th. Occasionally it will not shift until almost 60mph (compared to it's usual shifting around 40-45). At this speed, the noise is considerably louder the shift feels rougher. I don't have a scanguage or a tach to provide any more info. Any reason it would be doing this? Any remedies?

12-18-2012, 04:50 PM	#3
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	The Yaris prohibits 4th gear until the AT fluid and engine coolant reach a threshold (which is typically when the green "cool" light goes out, as the coolant takes longer to heat up than the AT fluid does). If you are interested in being able to override that behavior, I figured out how to do so using just a switch and a resistor: http://www.yarisworld.com/forums/showthread.php?t=37691 __________________

12-18-2012, 05:52 PM	#5
Golddeenoh Takes corners too fast! View User's Garage Drives: Absolute Red 2009 Yaris HB Join Date: Apr 2012 Location: Columbia, SC Posts: 830	the green light goes out at 130 degrees Fahrenheit normal operating temperature is between 184 and 194 degrees Fahrenheit. the oils will warm up before the coolant get that hot, the question is are you getting everything hot enough, long enough to operate properly? how long do you typically drive in one outing? if you drive less than about 10 miles in one direction then the engine and trans operating temperature has not been reached and the system safety precautions will not allow the trans to sift into higher gear. this is done to prevent strain on the engine which can cause premature ware and failure. __________________ mods:15''Drag DR21 w/Nitto NeoGen 205/50R15, Tanabe DF210 lowering springs 1.6/1.8, TRD Rear Sway Bar, Tanabe Front Sway Bar, Micro Image Short Throw Shift Kit (both in and under), 8.64lbs flywheel, F1 Stage 4 Clutch, AEM Cold Air Intake (Red), Megan Racing Header, DC Sports Axle Back Exhaust, Micro Image Crank Pulley, NST lite Alternator Pulley, ARP Manifold Stud Kit,Tanabe Front Strut Tower Brace, ScanGuage II, Micro Image Silicone Radiator Hose Kit (Red), NRG Carbon Fiber Shift Knob (round), 2009-2011 Toyota Yaris Liftback Foglight kit, NRG Grounding Kit (Red), Hella Horns(Red),CF Hood

12-18-2012, 08:22 PM	#6
MadMax Drives: 2008 Yaris Liftback (Sprocket) Join Date: Oct 2008 Location: San Antonio, Texas! Posts: 2,799	Yep, even with the 'cool' light off I still find it takes a while for the transmission to warm up sufficiently to shift into OD (4th). Unless this is happening after you've driving for a while (5-10 minutes) then it is completely normal. By the way, where are you in the great state of Texas? Cheers! M2 __________________

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12-18-2012, 04:24 PM	#2
david_827 View User's Garage Drives: 07 Yaris Sedan Join Date: May 2012 Location: boston, MA Posts: 268	is it having this issue when the "COOl" light is on on the dashboard???? This sometimes happens to me when i try to push my car before it warms up.

12-18-2012, 05:04 PM	#4
samus11 Drives: 08 Yaris Join Date: Sep 2012 Location: Texas Posts: 2	It does happen mostly at the beginning of drives, but I feel like I've experienced it after the green "cool" light has gone off. Maybe I'm just going crazy.