overdrive - Toyota Yaris Forums

rider99 · 12-08-2012, 11:28 PM

I have a 2007 Yaris sedan with 140,000 miles it has an automatic transmission. My question is that no matter what the outside temp. is here in Louisiana it does not like to shift into overdrive in the morning(worse) or started after 8 hours of rest. I am certain that this has became noticeably different than the previous years. Is there something I should have checked? a/t oil never changed

tripleyaris300 · 12-08-2012, 11:51 PM

This is same as my Yaris with 72k miles on it and on my other yaris with 38k miles. It seems like the computer is programmed so that the engine warms up as fast as possible to reach its normal operating temp to save fuel.

rider99 · 12-08-2012, 11:57 PM

could the thermostat be stuck open?

Golddeenoh · 12-09-2012, 12:53 AM

the light on your dash goes out at 130 degrees Fahrenheit, normal operating temperatures for internal combustion engine are between 178-215(don't remember exact but around there). our little 1nz-fe appears to go from 184-204(at least that is what my gauge reads) the priority in today's vehicle is emissions first, so the engine has to get warm enough to burn of more toxic gasses. the engine will make that it's priority before it makes fuel economy a priority (i.e. Overdrive) so it is fairly common any more for features to not be available until the priority list is checked off.

oh the 130 should be when the computer takes over full control because the Oxygen sensor is warmed up.

CTScott · 12-09-2012, 09:40 AM

Both the water temp and AT Fluid temp need to reach a threshold before 4th gear prohibition is disabled. I did some experimentation a while back and figured out how to override it with a momentary switch and resistor. It works perfectly and is very simple to implement:

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

daf62757 · 12-09-2012, 03:38 PM

When I first got my Yaris, I was concerned but after reading about the systemic process on this forum, I just got used to it.

I don't think I possess the mechanical skills to try and override anything so I will leave it along and just keep on truckin!

dorman68 · 12-10-2012, 04:33 PM

Normal operation. My inlaw's Yaris & my old Echo do the same exact thing.

12-08-2012, 11:28 PM	#1
rider99 Drives: 2007 yaris sedan Join Date: Jul 2011 Location: louisiana Posts: 19	overdrive I have a 2007 Yaris sedan with 140,000 miles it has an automatic transmission. My question is that no matter what the outside temp. is here in Louisiana it does not like to shift into overdrive in the morning(worse) or started after 8 hours of rest. I am certain that this has became noticeably different than the previous years. Is there something I should have checked? a/t oil never changed

12-09-2012, 12:53 AM	#4
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 light on your dash goes out at 130 degrees Fahrenheit, normal operating temperatures for internal combustion engine are between 178-215(don't remember exact but around there). our little 1nz-fe appears to go from 184-204(at least that is what my gauge reads) the priority in today's vehicle is emissions first, so the engine has to get warm enough to burn of more toxic gasses. the engine will make that it's priority before it makes fuel economy a priority (i.e. Overdrive) so it is fairly common any more for features to not be available until the priority list is checked off. oh the 130 should be when the computer takes over full control because the Oxygen sensor is warmed up. __________________ 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

12-09-2012, 09:40 AM	#5
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	Both the water temp and AT Fluid temp need to reach a threshold before 4th gear prohibition is disabled. I did some experimentation a while back and figured out how to override it with a momentary switch and resistor. It works perfectly and is very simple to implement: www.yarisworld.com/forums/showthread.php?t=37691 __________________

12-09-2012, 03:38 PM	#6
daf62757 Nothing beats a Toyota! View User's Garage Drives: 2013 Yaris 5 dr liftback Join Date: Jan 2009 Location: Indianapolis, Indiana Posts: 564	When I first got my Yaris, I was concerned but after reading about the systemic process on this forum, I just got used to it. I don't think I possess the mechanical skills to try and override anything so I will leave it along and just keep on truckin! __________________ Big Dave Indianapolis, IN Synthetic Oil....its in my car.....for at least 10,000 miles!

12-10-2012, 04:33 PM	#7
dorman68 Drives: Corolla Join Date: Sep 2009 Location: Pa Posts: 8	Normal operation. My inlaw's Yaris & my old Echo do the same exact thing. __________________ 2003 Echo - Auto Trans - 93,000 mi.

12-08-2012, 11:51 PM	#2
tripleyaris300 1.5L Drives: 2009 Yaris Join Date: Apr 2012 Location: Northridge,CA USA Posts: 1	This is same as my Yaris with 72k miles on it and on my other yaris with 38k miles. It seems like the computer is programmed so that the engine warms up as fast as possible to reach its normal operating temp to save fuel.

12-08-2012, 11:57 PM	#3
rider99 Drives: 2007 yaris sedan Join Date: Jul 2011 Location: louisiana Posts: 19	could the thermostat be stuck open?

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