topdog63

Hey guys, I'm new here as I am a first time Yota owner. I bought a 1990 extended cab V-6 with auto transmission recently. I got a pretty good price on the truck cause when I drove it it was running horribly and the guy sold it to me for $1,000 less than his asking price. At any rate the O/D Off light has been flashing so i ran the codes and it gave me the code for the "No. 2 Speed Sensor". The guy I bought it from said there was less than 200 miles on a rebuilt tranny and by all appearances, he wasn't lying. My question is where exactly is the No. 2 speed sensor? I don't want to just start randomly pulling pieces off of my transmission.

Also with that problem, everything seems to shift fine but when I'm going up a hill there is alot of seemingly unnecessary shifting and the gas mileage sucks. I think I'm getting 15mpg at best. I'm only on 31" tires so that shouldn't be the case and when I had it smogged the guy said it passed smog like it was brand new. Will that speed sensor cause the horrible gas mileage?

Btw I resolved the poor performance problem by setting the timing to the proper specs when I got it home. It was all the way retarded when I checked it out. A little twist of the distributor to 10* off and it ran great.

BMcEL

15mpg isn't bad at all for a V6 auto. Mine runs like new and I was getting 12-15 before I did the 5 speed swap.

A340H sensors:


http://personal.utulsa.edu/~nathan-b...48electron.pdf

topdog63

That diagram is a great help, I think it's probably worse than 15mpg. There is about a 12 mile stretch of road that I travel on a regular basis that is uphill but usually cruise it at about 60-65 and I'll burn almost a 1/4 tank in that stretch. I also still need to figure out if the #2 speed sensor can cause the A/T Oil Temp light to come on.

topdog63

A 5 speed swap is in my future....

BMcEL

Only the temp sensor can illuminate the warning light. It's most likely a bad connection causing the light to come on if it's not overheating.

Just did mine a few weeks ago...you'll love it. My mileage went from 12/15 to 14/19 and it actually responds to the skinny pedal now.

topdog63

I guess what I meant is that if the speed sensor is bad and it is doing alot of unnecessary shifting because of that, will that cause it to get hot? There is a slight leak so I'm going to repair that first and clean all of my connections before I drop some coin on a new speed sensor.

I have heard that putting a 5 speed in will make all the difference in the world. I just gotta convince the wife that a few hundred $ now will save alot more down the road. Her response so far was "why didn't you buy one with a 5 speed in it?" She just doesnt understand. Haha! Wait til I have to explain to her why I need a lift and tires and gears!

BMcEL

Not likely, and the temp warning light doesn't come on until upwards of 300 degrees F...you'd know if it was actually getting hot.

I saw a pretty significant power increase. The swap ran me about $1500 but I got a low mileage transmission and new clutch/flywheel. Best bet is to buy a donor truck if you're on a budget, that way you can part the rest of it out and recover some of your expenses.

topdog63

Sweet thanks. I think alot of the problem may be dirty connections since the tranny was just rebuilt and there's a small leak throwing oil all over

scope103

I've only lit up the over-temp light three times. My personal belief is that I was climbing a long hill (Sacramento to Tahoe) on the freeway on cruise control. To climb that hill, it shifted up and down a fair amount. But what I think is causing the over-temp is the cruise control picking a speed where the torque converter is running, rather than reaching lock-up in that gear. Now, I "hand drive" (foot drive?) that section, so that when it wants to shift I can pick a speed where it hits lockup. And it doesn't overheat.

Not much to support my opinion, but that's my story.

So I don't think the speed sensor is causing your over-heat, I think your driving style may be.

(By the way, code 61 does NOT say "replace the No. 2 speed sensor." It also includes "severed wire harness or short circuit." You can waste lots of time and money thinking that a diagnostic code just tells you what part to buy.)

BMcEL

^ Good post.

And again, the trans temp light doesn't come on until upwards of 300 degrees F so your floorboards would be cooking if it was really overheating.

scope103

This may help:
http://personal.utulsa.edu/~nathan-b...34electron.pdf

macdaddy69

I have a 93 4runner. do you know if the no 2 speed sensor is external or internal on my year. if its external, is it just a pull out old one and put in new one and conect the wire harness???