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hi, I'm wondering if anyone has had this problem and could give me some advice on how to fix it. my temp gauge in my 2001 Montero Limited is reading hot. When I first start it up it reads cool then within seconds it goes to the mid point temp range and then to above hot after only driving it for max of 4 minutes. I pulled over and let it sit for a minute and checked under the hood, the engine was cool there was no girgling sounds coming from the radiator the coolant levels were fine. I've checked for leaks and there doesn't appear to be a leak anywhere.

any advice anyone can give me would be appreciated.

thank you!
montero1
 

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it is possable it is just a faulty engine temp sensor.anyone that can hook up diagnostic equipment can monitor the actual engine temp sensor reading while comparing it with an external temp sensor.sounds like you may have either a faulty sensor or a wiring fault between the sensor and the dash
 

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My temp sensor does not seem to move on my 03 (- constantly at 8 o'clock - I was beginning to wonder if the temp guage actually worked. Hope you can figure out your problem - good luck! Any ISO standard OBD-II tool should be able to read the engine temperature real time....
 

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provided your truck is not actually overheating (which you MUST check before anything else), there have been a few issues with the instrument cluster ECMs causing irregular temp gauge readings.
 

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i'm having a similar problem so i'm wondering how your problem was solved in the end? my temp gauge was reading hot, but no visible sign of steam or engine overheat. however, the shop (non-dealer) said tests showed it does overheat. it's been a week at the shop and by now, they've replaced a timing belt tensioner which was worn out - something to do with loose timing belt and water pump not spinning properly as a result. they expected this would have fixed the problem, except it didn't. next they replaced the thermostat, temp sensor and gasket. still the temp gauge is going all the way to hot. i'm starting to think there is something specific to the montero limited that is not obvious to these guys. has this happened to anyone? some folks mentioned the ECMs problems - i don't know what that is, but it sounded like an incorrect gauge reading without actual overheating occurring. is that correct?
 

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Anybody get the temp gauge problem figured out?

I have the dealer look at it they replaced the computer and checked all the sensors and the gauge will still go all the way to hot. The dealer said this is the 2nd Montero they have seen with this problem.

I finally gave up on my 2001 montero limited temp gauge and put a mechanical aftermarket gauge in. It never moves off 190 degrees.

I'd like the stock gauge to work if anybody has any ideas.

Thanks!
 

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Hi All,

I have exactly the same problem -- when the engine is on, the temp gauge is moving back and forth between middle and max. The mechanic replaced both the thermostat and the temp sensor -- no effect. The cooling system looks totally fine, liquid level normal, the actual temperatures measured by mechanic are normal everywhere, just the gauge reading is wrong. So obviously it's either wiring or the cluster problem. Has anybody succeeded fixing it? Do I need to replace the instrument cluster, or there is a less expensive workaround?

Thanks!
 

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<div class='quotetop'>QUOTE (ds135 @ Oct 28 2008, 12:26 PM) <{POST_SNAPBACK}></div>
Hi All,

I have exactly the same problem -- when the engine is on, the temp gauge is moving back and forth between middle and max. The mechanic replaced both the thermostat and the temp sensor -- no effect. The cooling system looks totally fine, liquid level normal, the actual temperatures measured by mechanic are normal everywhere, just the gauge reading is wrong. So obviously it's either wiring or the cluster problem. Has anybody succeeded fixing it? Do I need to replace the instrument cluster, or there is a less expensive workaround?

Thanks![/b]

did you actually read the posts? ive already replied.

Its the instrument cluster ECU.
 

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<div class='quotetop'>QUOTE (manybrews @ Nov 17 2008, 08:01 PM) <{POST_SNAPBACK}></div>
did you actually read the posts? ive already replied.

Its the instrument cluster ECU.[/b]

Hi manybews,

I also have the same issue with my 2001 Montero XLS. I took it in and they said I need a new thermostat and senor unit. But I decided to do some research first. The gauge is going crazy, but I drive the car and I haven't noticed it physically overheating -- it never has -- so I am not even sure if it needs a thermostat. I even turn the A/C on and it seems fine.

If it is the instrument cluster ECU, how do I get this fixed?

Thanks.
 

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I have a 2002 xls with the same problem. I took it to a non-dealer and thay took the engine temp and said it was NOT overheating (198-202deg). They also told me that they had another customer with the same problem since he bought the suv and has been driving around for years without any overheating. I would suggest getting an aftermarket temp gauge instead of spending any money on diagnostics (as long as the engine seems not to be overheating). Although, this does not help the resale. I was nervous since I had just started a road trip from Denver to Aspen, but after going on a 22 mi 4x4 trail that same day I have confidence that this is not an engine problem and most likely faulty wiring or gauge. Also, the machanic said that when he unplugged the wire to the temp sensor the gauge bounced around at 1/4 (seems like a faulty dash gauge to me).
 

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<div class='quotetop'>QUOTE (manybrews @ Nov 17 2008, 09:01 PM) <{POST_SNAPBACK}></div>
did you actually read the posts? ive already replied.

Its the instrument cluster ECU.[/b]

again to repeat manybrews....
 

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Manybrews is spot on. My '02 Montero XLS has the same temp gauge issue. Erratic behaviour of the gauge, but the engine is not overheating. My research into this has found that the problem lies with the small daughter board attached to the backside of the instrument cluster PCB. This board contains the logic for the temp gauge. Unfortunately, this board also contains the chip for the odometer. Apparently the fix is to replace this daughter board, but since it contains the odometer reading, the Mitsubishi dealer (if that's where you're having it repaired) must send the new and old daughter board (along with the cluster PCB?) to some company in Michigan to get the odometer data transferred to the new board. I never went this route, nor checked into how much this would cost. Although I have yet to do this, the solution in my case will be to just install a manual temp gauge to monitor temperature.

I actually removed the daughter board and cleaned the contacts - no help. Some components did give the appearance of getting hot, but most of it is discrete circuits, smaller and impossible to replace yourself. I've had this problem on my Montero for about a year. Although keeping a close eye on it, it has not overheated (knock on wood).

I replaced the timing belt on it myself this past winter and the auto-tensioner was a little extended and I thought it may have been causing the water pump to not function at full capacity, or perhaps sporadic causing my temp issues. But it turns out that was not the case as it's still doing it. So back to the daughter board theory.

Hope this shines a little more light on this problem.
 
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