I NEED HELP

[blueturtle]

2007 yaris was running great then all of a sudden speedometer stopped working and maintenence light is on can someone help with an idea of what may be wrong? now when car is idleing the whole car vibrates. i need help thanxx.....no warranty

[blueturtle]

2007 yaris no warranty

[CTScott]

Manual or automatic?

[blueturtle]

its automatic, wife just told me she made a left turn and speedometer started working for a few seconds then stopped again

[dinoman]

rough idle is a hard to diagnose issue as there are many things that can affect the idling. did all the problems happen at the same time? are other functions of your instrument cluster still working? have you checked the fuses? if you have access to an OBD scanner check what error is given.

[blueturtle]

speedo stopped working friday.... today i pulled battery and messed with the fuseible link and checked a few fuses now the check engine light is on and the rough idle started now i feel like i screwed something up.......??????? yes other functions r still working

[CTScott]

its automatic, wife just told me she made a left turn and speedometer started working for a few seconds then stopped again

The only fuse involved with the vehicle speed sensor would be the ECU-IG one in the fuse panel that is under the bottom of the dash.

The intermittent piece would make it not a fuse thought. A loose connector would be more likely. You can check the right connector on the cluster which is where the vss signal comes in from the transmission. The other end of that signal is on the top of the automatic transmission (the 3 pin black connector).

Did you do anything recently to the car, particularly anything wiring related (like installing a new radio)?

[blueturtle]

i have not done anything to the car we have only had it since july 2 we bought it from a toyota pre owned lot

[dinoman]

when you pulled the battery, did you make sure the terminals are clean when you reconnected the battery back and that the contacts are good?

you may already know, but once you pull the battery off, it clears your ECU. ECU needs to re-learn the idle and such to maximize efficiency. Have you followed the procedure to let ECU learn the idle after it has been reset? Its in your manual but I believe it was something like this (someone correct me if Im wrong)
1. leave car idling without a/c for 5 min.
2. turn the key to "OFF" position and let car shut off completely for 30 sec.
3. start the car again, this time idling WITH a/c on for 5 min.
4. do step 2 again.

[blueturtle]

thank you i did not know that about resetting ecu.....just had car out and it is now not shifting into overdrive i cant believe this we bought this car because we thought toyota would b a good reliable car and hopefully it still will but i am getting upset with it

[dinoman]

Yaris doesnt like to shift into overdrive while the car temperature is low to help reach ideal operating temperature quicker. you can see the "COOL" thermometer light lit on the right when this is the case. Im not sure if this is what you are experiencing

[CTScott]

Yaris doesnt like to shift into overdrive while the car temperature is low to help reach ideal operating temperature quicker. you can see the "COOL" thermometer light lit on the right when this is the case. Im not sure if this is what you are experiencing

That's true, but once it is warmed up the ECM may still not allow it to shift into overdrive since it is not getting the speed signal.

[blueturtle]

so do u guys think the speed sensor might b bad?

[CTScott]

so do u guys think the speed sensor might b bad?

Either it is bad, or as I mentioned above, the connector on one end or the other is not seated.

[thetut]

Contact the dealer. If you bought it from a Toyota pre-owned lot there should be at least a 90 day warranty.

[nookandcrannycar]

Contact the dealer. If you bought it from a Toyota pre-owned lot there should be at least a 90 day warranty.

^^^^^ This

[blueturtle]

ctscott am i able to get to the other end on top of trany, i am over my head here can u help me out where on top of trany and does it just push back in? i really appreciate ur help thanx!

[CTScott]

ctscott am i able to get to the other end on top of trany, i am over my head here can u help me out where on top of trany and does it just push back in? i really appreciate ur help thanx!

The AT speed sensor connector is not the easiest thing to get to. It is located on the top of the differential on the top side of the back of the transmission (circled in the picture below). To get to it you really have to pull the battery and battery tray. Once you get to it, you can simply push on the connector to make sure it is clicked into place and if it already is, you squeeze and pull it to remove it to look to see if it has any corrosion.

If you haven't checked the other side yet, I would start there, as the instrument cluster connectors only require your fingers to get to. You simple pull off the two vertical black pieces along the sides of the radio, and then pull the cluster trim piece straight back.

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Just as an FYI, this is what the entire speed sensor assembly looks like:

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