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A/T Light stays on... #571899 02/22/05 03:06 AM
Anonymous
Unregistered
Hi guys -

I posted earlier this week about a leaking transmission. I've got an 89 Montero, 125k.

The A/T light had been coming on after driving about 30 minutes. I put it in Park a couple of times and waited a looooong time for the light to go off. (20 minutes is a long time to sit in a grcoery store parking lot).

The last time the light came on, I was about 2 minutes from my house, and it was late. I turned off the engine instead of sitting in park. Now the darn light won't go off - it is on from the minute I start the car.

I topped off the ATF - it took about 2/3 of a quart to get to the "hot" range notches, checked when the engine was fully warmed up. Even after putting in the fluid and idling for a half-hour, the light it still on.

I know the A/T Temp can't possibly be at 300 degrees after a night out in the cold, so the sensor is either busted or it is telling me something else is wrong. Does the A/T light mean anything other than "Your trans. fluid is too hot right now"? Could it mean "Hey dummy, you need to have this looked at"?

I live in the Los Angeles area; it has been raining like crazy here (Hard to believe, I know). Every time the light has come on, it has been wet out. Off-Roader wrote in this post that his temp sensor was messed up by the wet weather.

Anything I can do to check this out? Is 2/3 quart very much transmission fluid? In my last post, you guys speculated that the A/T light was coming on because there wasn't enough fluid - would that be low enough to cause a problem? Or could the problem be the sensor all along? Or something else?

Thanks, I appreciate your advice,

- h

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Re: A/T Light stays on... #571900 02/22/05 03:16 AM
Joined: Feb 2004
Posts: 10,238
FrankR Offline
Web Wheeler
****
Sounds like the sensor is bad to me. You should have a look to see where the fluid is leaking. That's not a huge amount of fluid depending on how long it has been since it was last filled, but it's enough to cause major concern - at least keep an eye on it to see the rate of leakage because it shouldn't be leaking at all. and if it suddenly blows a seal on the highway you may not know it until it's too late - particularly with a bad sensor.

Frank


'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum
Re: A/T Light stays on... #571901 02/22/05 03:38 AM
Joined: Aug 2004
Posts: 883
R
rapha Offline
Rock Warrior
Check the hoses for leaks and try to track it down. The sensor will cause the light to stay on, is about about $15 from the stealer and is a 10 minute job. Good Luck!

Carlos


'05 Frontier, Auto Tranny, 4.0 V6, 2WD <img src="/forums/images/graemlins/frown.gif" alt="" />
Re: A/T Light stays on... #571902 02/22/05 04:47 AM
Joined: Nov 2002
Posts: 4,127
DaphneD Offline
Roll Me Over

Re: A/T Light stays on... [Re: DaphneD] #571903 02/22/05 05:26 AM
Anonymous
Unregistered
DougB -

I did see the sticky; I was mostly wondering if the light-always-on means the sensor is bad, no matter what, or if it could mean something is wrong.

I guess it always means the sensor is bad?

-h

Re: A/T Light stays on... #571904 02/22/05 05:42 AM
Joined: Aug 2004
Posts: 883
R
rapha Offline
Rock Warrior
Hoody,
The sensor is usually a good, cheap, and easy place to start. Like offroader said, water and electric connections don't mix. If the filter has not been changed (that you know of) you may as well do that as well. DougB did a very good write-up with pics on the filter change. Good Luck.

Carlos


'05 Frontier, Auto Tranny, 4.0 V6, 2WD <img src="/forums/images/graemlins/frown.gif" alt="" />
Re: A/T Light stays on... #571905 02/22/05 06:08 AM
Joined: Nov 2002
Posts: 4,127
DaphneD Offline
Roll Me Over
A/T Temp light on all the time means that the sensor is busted. Keep in mind, if you drive the truck with a busted sensor, you may still be overheating your transmission and not know it!

Re: A/T Light stays on... #571906 02/22/05 05:34 PM
Joined: Jan 2000
Posts: 16,227
off-roader Offline
Web Wheeler
*****
Quote
I did see the sticky;


<img src="/forums/images/graemlins/kewl.gif" alt="" /> Thank you!! <img src="/forums/images/graemlins/smile.gif" alt="" />

Quote
...Like offroader said, water and electric connections don't mix... Carlos


I did? OK, probably on another post.

Hoody,

I've found on mine that is sometimes gets wet which shorts out the sensor temporarily. Usually after things dry, the sensor works fine again. Do let us know what you decide to do and how you make out on the repair.

Ray
AKA Off-Roader


Off Roader
98 Montero with the Winter Package
89 Montero minty clean and reserved for overlanding trips or Cars and Coffee events
96SR (3.15:1 xcase, 35's) gone to the rust gods
96SR Build Up Thread
Old web page
Old web page
Re: A/T Light stays on... [Re: off-roader] #571907 02/22/05 08:24 PM
Anonymous
Unregistered
I am here in Southern CA and with the heavy rains, my light keeps going off and on. I had it parked for the day and when I went home, within one minute the light came on. I would say replace the sensor and/or make sure the old is sealed properly.

Re: A/T Light stays on... [Re: off-roader] #571908 02/23/05 02:10 AM
Joined: Aug 2004
Posts: 883
R
rapha Offline
Rock Warrior
Quote
I did? OK, probably on another post.


Actually talking about the same situation.

Here

I have no idea how I remembered that, and it probably makes me look like a freak. <img src="/forums/images/graemlins/scared.gif" alt="" /> <img src="/forums/images/graemlins/lol.gif" alt="" />

Carlos


'05 Frontier, Auto Tranny, 4.0 V6, 2WD <img src="/forums/images/graemlins/frown.gif" alt="" />
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