tranny or speed sensors? - Toyota Sienna Forum - siennachat.com
 
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post #1 of 8 (permalink) Old 05-12-2017, 09:24 AM Thread Starter
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tranny or speed sensors?

My check engine light checks out ok on startup but its not showing any problems. I think I'm going to try to pull codes anyway, because my transmission is definitely not 100% and this should be getting picked up by diagnostics right? Anyway, is there another way to diagnose it? Symptoms are hard, delayed shift especially with moderate pedal pressure, and it happens when its fully warm too and when cold. I know some of this is normal when cold but it does it all the time. I can make it shift smoother by easing up on the pedal just before it shirts. Just wondering if there's a chance its just the speed sensor(s)? Its a new-to-me 2000, and I've already drained the fluid twice and replaced it the 2nd time with synthetic and a bottle of Lucas.

Driving a 2000 Sienna LE since April 28, 2017.
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post #2 of 8 (permalink) Old 05-12-2017, 01:55 PM
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Re: tranny or speed sensors?

In the Toyota maintenance they only recommend draining and replacing the fluid and that's what I did to my 2000. If that's all you did it might be worth dropping the pan and replacing the filter. As you probably know, the amount of fine, silver colored metal deposited in the bottom of the pan is an indicator of the transmission's condition. Sorry I have no idea about the speed sensor question.
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post #3 of 8 (permalink) Old 05-12-2017, 07:44 PM Thread Starter
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Re: tranny or speed sensors?

Unfortunately I can't drop the pan until after I do a 1200 mile drive, but I intend to do it then if I make it there. There was some deposit but not much on the drain plug when I pulled it the first time.

Had the codes pulled but only a stored O2 sensor came up. I don't give a hoot about that one.

Driving a 2000 Sienna LE since April 28, 2017.

Last edited by Previalover; 05-12-2017 at 11:42 PM.
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post #4 of 8 (permalink) Old 05-19-2017, 07:00 AM
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Re: tranny or speed sensors?

how many miles?

an erratic o2 sensor can cause engine hesitations that could be confused as a transmission problem. Or the sensor could be merely "complaining" of another engine problem, such as a vacuum leak.

The suggestion about dropping the pan is a good one. You see a bunch of metal shavings in there and you know the tranny is flat wearing out.

2005 sienna xle limited, 230k miles
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post #5 of 8 (permalink) Old 05-19-2017, 01:43 PM
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Re: tranny or speed sensors?

Did the shifting issue exist before you changed the ATF? Did you use the correct spec fluid (formerly known as Dexron Mercon 3)?

You mentioned drain "plug." Which one--the differential or the tranny pan? Most of the ATF will drain through the differential, in my experience.
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post #6 of 8 (permalink) Old 05-19-2017, 02:06 PM Thread Starter
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Re: tranny or speed sensors?

Yeah the shifting issue was there when I bought it, apparently, although I didn't notice it until a day or two after I bought it.

I drained the tranny plug once, but couldnt get the diff plug out. I used the right fluid, but just cheap Walmart stuff because I knew I'd be draining it again. Then I drained both tranny and diff, and used synthetic ATF with a bottle of Lucas. I havent dropped the pan because I can't until I get home, if I get home. I'm just going to baby it and feather those shifts and look for a new vehicle.

Driving a 2000 Sienna LE since April 28, 2017.
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post #7 of 8 (permalink) Old 05-23-2017, 01:02 AM
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Re: tranny or speed sensors?

I am not really good with my hands and I would rather stay that way. I once tried to pull a quick fix and got my insurance plan jeopardized because apparently it was similar to modifying the car's original condition. A simple problem could easily arise into a way bigger one if you are not careful enough.
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post #8 of 8 (permalink) Old 05-23-2017, 04:13 PM
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Re: tranny or speed sensors?

If you haven't come across the idea, some of these vans had problems with their shift solenoid. I think that problem would throw a code. No experience with this issue, but maybe something to look into.
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