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Discussion Starter · #1 ·
I have a tranny light on the dash flashing like mad which puts the 95.5 Rodeo in a "limp mode" when driving but if the key gets turned off and the tranny light starts flashing then it won't start at all.

Been driving me nuts so I shipped it off to my mechanic who isn't 100% sure he can fix it.I have full coverage till October at least so blowing it off this earth is still an option.

Anyone got any ideas????
 

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I think thats the high temp sensor going off. Ask Rubo about his night on Rocky Mount. I think his did same thing on main obstacle. ONce cool, he was fine.
 

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If the "Trans Temp" light comes on, it means that the tranny has hit 275 degrees (which is too hot). The light flashing is a general error condition. You can have the codes read from the transmission control module. This will tell you what caused it to go into limp mode.

-Tad
 

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Discussion Starter · #4 ·
Not trans temp.I can't even start it so the tranny isn't hot.

The check trans light is flashing like mad and for whatever reason it's on is keeping the Rodeo from starting.

When it first did this I was driving down the road and the check trans light came on and went into a limp mode so I pulled off the road and checked the trans like my light said to but nothing was out of the ordinary.When I refired the truck it was off and all was well.It didn't happen again for a few more days and then it happened a bunch....then finally wouldn't start at a stop light until I cussed it out and flipped off a couple people yelling at me.I got it home and changed everything I could think of from the plugs and wires to the fuel filter and pump...nothing!!

I then started pulling codes...no codes.Checked(and removed)my remote start...nothing.

Found that whatever is making this light flash has caused the fuel pump wire to go dead but it isn't cut or anything.All relays and fuses are good???

Came to the conclusion that so far the Rodeo is smarter than me so I sent it off.So far the mechanic hasn't called to tell me it's running so I guess he hasn't figured it out yet either.

I would just like to have a direction to point him in.

There was a guy who posted the same problem on the Wire but it was his first and only post and I can't get a response back from him.

Any ideas now that there is some more info?????
 

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You have a gremlin.

Did you pull the tranny codes, or the engine codes? (They are seperate).

How's the voltage? Too high or too low will cause really strange problems. Is the battery dead/defective?

With all of those things happening I suspect an underlying problem. Maybe an engine ground is loose. Or the battery cables are loose, or the battery has an internal short or intermittent open connection.

Good luck, and be sure to let us know what you find!

-Tad
 

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Discussion Starter · #6 ·
Just talked to the mechanic and after 5 hours of tracing wires and checking voltages he thinks it may be the ECU.He wants me to send it to a stealership....nah.

I think I will buy a coded ECU and change it and see what happens....who knows what the whole issue is but I bet that is a good start.He is recommending a new ECU and afdter seeing everything he was talking about I tend to agree.

I am going to go searching for a new ECU and see what happens
 

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Discussion Starter · #7 ·
Ok...got am ECU today from All Hyundai and Isuzu parts(Overnighted!!!) and put it in today....Not the ECU!

The Rodeo isn't acting any different with a new brain.

At this point I have no idea.My mechanic gave me the trade wiring schematic to check over but he(and eveyone else) is recommending the Stealership,I really don't have the fundage for them to have the Rodeo not to mention listen to them gripe about the aftermarket stuff on it.

Up yonder in one of the reply's to this it was said about pulling tranny codes...is this done in the same spot or is there another port somewhere??

Remember this is a 95.5 Rodeo so it's OBD1.I tried to pull engine codes and didn't get anything but I may try again when it comes back to my house tomorrow.

Thanx all for your opinions and let me know if something else strikes you.
 

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Discussion Starter · #8 ·
Don't know if anyone is keeping score or really cares but my newest attempt to fix this has failed again.

It seems that popping the hood and banging your head repeatedly on the fender dosen't do any good.

Anyone???

Please??

Anyone????
 

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The previous comments seem to cover the most likely issues. That being said, what about the engine temperature sensor"? I think you have two, one for the dash and one for the computer. If the later one is bad when driving down the road the computer eventually concludes the engine should be warm but isn't. It will then default the AT into the limp mode. I don't think this explains why the vehicle won't start though.

Also I see no info on the condition of the AT fluid. Low level or burnt fluid can cause real problems. Again I don't see how that would prevent you from starting though. Nonetheless checking the fluid is always a good basic step when dealing with tranny problems.
 

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You have something electrical that isn't working. You can try the range selector switch on the side of the transmission. It can be opened and cleaned. This may explain the non-start too, as the neutral safety switch might be located there as well. Your diagram can confirm/deny that.

-Tad
 

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OMG this is exactly what happened with my trooper.

Get your alternator checked out, I didn't see whether or not you've checked that, but if not, do it again.

My trans started acting up, and Tad told me to get my alternator checked, so I did. It was fine at the time. The light kept flashing and so forth. Finally I took it in for tranny service. Light kept going off, just not as often (new solenoid could handle the voltage drop better I'm guessing). Finally I replaced the alternator and haven't had an issue since.

Seriously, I almost got stuck in the middle of BFE in south carolina coming home from savannah thanks to this gremlin. When I finally figured it out, it was time to get a new ride anyways.

go check your alternator pronto.
 

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Discussion Starter · #12 ·
My mechanic said he had checked the altenator but after reading this over and over looking for someones hidden message I am going to go over everything in this post again until I figure it out or give myself brain damage from banging my head on my fender.

It dosen't make a lick of sence how the altenator can affect the tranny so I'm betting when I told him to check it out he rolled his eyes and said...."sure man.....whatever".I think tomorrow is supposed to be somewhat dry so I may crawl around on it to get it off the motor and up to Autozone for a check.

About this sensor....range selector I believe it was called,what are we talking about in the way of a limp mode or non starting???Is this a replaceable part??Is this the little(in my best technical jargon)doo-hickey that tells the computer what gear I'm in???This somewhat same part went out on the wife's family truckster and it acted real similar but never kept it from starting.

I am just flustered and my forehead hurts...gonna look at some porn and have a Killian's to get my sanity back.

BTW...in case I haven't said it before...Thanx a bunch for putting up with my endless questions and lack of knowlege on this.Not to mention my child-like whinning I really appreciate all y'all's help and advise
 

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FIEND said:
My mechanic said he had checked the altenator but after reading this over and over looking for someones hidden message I am going to go over everything in this post again until I figure it out or give myself brain damage from banging my head on my fender.
Part of checking the alternator is checking the engine ground, and battery cables. You should be able to put a voltmeter between the positive battery terminal and ground, and then between the positive battery terminal and the engine block and not have more than a couple of tenths of a volt difference.

FIEND said:
It dosen't make a lick of sence how the altenator can affect the tranny so I'm betting when I told him to check it out he rolled his eyes and said...."sure man.....whatever".I think tomorrow is supposed to be somewhat dry so I may crawl around on it to get it off the motor and up to Autozone for a check.
Yup, it doesn't make sense, until you've had it happen to you. Any chance you can put a voltmeter on it? Check it both while cranking, and with nothing going on.

FIEND said:
About this sensor....range selector I believe it was called,what are we talking about in the way of a limp mode or non starting???Is this a replaceable part??Is this the little(in my best technical jargon)doo-hickey that tells the computer what gear I'm in???This somewhat same part went out on the wife's family truckster and it acted real similar but never kept it from starting.
That's the one. It is mounted to the side of the transmission under the truck. Somewhere around here some described how to clean it. It could cause the truck to not start because (I believe) it houses the neutral safety switch. The wiring runs up to 3 connectors near the airbox. They are different colors. Make sure that these are tight, and it wouldn't hurt to disconnect each one and reconnect it.

FIEND said:
I am just flustered and my forehead hurts...gonna look at some porn and have a Killian's to get my sanity back.

BTW...in case I haven't said it before...Thanx a bunch for putting up with my endless questions and lack of knowlege on this.Not to mention my child-like whinning I really appreciate all y'all's help and advise
Good luck!

-Tad
 

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The reason the alternator messes with the tranny is because there are electrically powered solenoids inside the tranny that need a certain voltage to actuate. When they don't have enough juice, they complain. When they get to much juice, they complain.

When I was driving down to savannah one time at night, I was on 95 and I thought someone flashed their high beams from behind me. I look down at my dash to check my speed, and I notice that it wasn't highbeams, but rather my dash lights were pulsating brighter than max intensity and back down again, coinciding with the voltmeter on the dash pegging out past 16 volts. It subsided and about 5 seconds later, the truck hiccup'd, and dropped to about 8 volt momentarily before coming back up to around 12-13 volts. The Check Trans light started flashing. I pulled off to the side of the road at a rest stop. let it sit for 5 minutes, then started her back up and drove the rest of the way just fine.

Alternator gremlins are evil, nasty things.
 

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Discussion Starter · #15 ·
Ok....the altenator is perfect.Albiet dirty but it is fine.

Any other avenues to tromp down?

I am about ready to throw it to the wind so getting it to start again in the next few weeks would be a good thing or it's hitting ebay :evil:

Any help would be great!
 

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Ok, what about a trans controller? the ecm that controls the trans. Did you look into the selector switch? This is the reason i ONLY buy manual transmissions. If you need a new fender let me know, i might have a few without forehead marks. Let us know how its going. If you can get a part number for your selector switch, i might have one or three and try that
good luck
Ron
 

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Discussion Starter · #17 ·
I have yet to deal with the tranny at all.I am trying to find a way to pull the tranny codes or get this thing to talk to me in some way.

BTW...fender is the last thing on my mind but thanx for the offer...LMAO!

^
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Did that sound like a ****???Just curious.Don't want to tick anyone off.I just reread what I posted and it didn't sound like I ment it...LOL.
 

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Discussion Starter · #18 ·
Just checking in with the progress or lack thereof.

The Rodeo hasn't been touched since the altenator test....other than to swipe the head unit for my car.

I have a guy who is going to look at it for me...I guess just for a fresh approach.

I haven't sold it yet like alot of people think...LOL.

Let you guys know more when I know more!
 

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Hey FIEND,
Try to disconnect all electrical connectors on the tranny and shift it manually. If you can drive it then check transmission controller. I don't know where it located in Rodeo, Trooper has it under passenger seat.
 

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Wish I could remember where the post was, but this is discussed on another Isuzu board site. Maybe you could try a search on Google. I happened to read about it, but was hunting for something else so didn't give much attention. Anyway, maybe this will help.
 
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