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Discussion Starter · #1 ·
When I got my car back, the thermostat was bad on it. It wasn't throwing a CEL for a while but yesterday it came up (for those who I'm sure would ask why I drive it when its thermo is bad, I have a 5 minute drive to/from work and I don't wanna leave my car under the trees at my house until I get my car cover in). Anyways, last week or the week before I ordered a JDM thermo but was just wondering if that is the cause of my CEL. Other than that, the car runs just fine
 

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Depending on which way the thermo is bad will give different CELs depending on wether the treasholds have been reached or not. If a thermo is stuck open, engine will not warm up enough and will stay in open loop, you will get a CEL for coolant temp insufficient, open loop. If thermo is stuck closed you will be running hotter than desired, will through a CEL for overheating if the upper treashold is reached.
I'm sure you know that 5 minut trips arent good for your engine though.
 

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Can't he check it and see the reason for the ECU just to be sure and see what's making it trip? That's what I would do anyway...it should tell you how to test it in your manual...will give you a code you'll have to look up and will tell you exactly why the CEL is on... Sounds like that's the reason though...like previously stated...good luck!!
 

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Discussion Starter · #4 ·
GSBoek said:
Depending on which way the thermo is bad will give different CELs depending on wether the treasholds have been reached or not. If a thermo is stuck open, engine will not warm up enough and will stay in open loop, you will get a CEL for coolant temp insufficient, open loop. If thermo is stuck closed you will be running hotter than desired, will through a CEL for overheating if the upper treashold is reached.
I'm sure you know that 5 minut trips arent good for your engine though.
On my way to work, it doesn't reach the overheating point. It's normally at normal operating temp. in longer trips than my 10 minute commute, it occasionally tops out but then goes back to norm. op. temp. Plus it's hot down here and it reaches the normal temp by the time I get to work :)
2swft4u said:
Can't he check it and see the reason for the ECU just to be sure and see what's making it trip? That's what I would do anyway...it should tell you how to test it in your manual...will give you a code you'll have to look up and will tell you exactly why the CEL is on... Sounds like that's the reason though...like previously stated...good luck!!
Yes I can go to AutoZone and have them check the code. There isn't one near me though so it would take me driving an extra 15-20 minutes to get to one
 

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GSBoek said:
Depending on which way the thermo is bad will give different CELs depending on wether the treasholds have been reached or not. If a thermo is stuck open, engine will not warm up enough and will stay in open loop, you will get a CEL for coolant temp insufficient, open loop. If thermo is stuck closed you will be running hotter than desired, will through a CEL for overheating if the upper treashold is reached.
I'm sure you know that 5 minut trips arent good for your engine though.


wrong wrong wrong

a thermostat has no way possible to throw a CEL. there are no electronics from the CEL to send a signal to the ECU. if you are having trouble overheating try bleeding your cooling system...
 

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Discussion Starter · #6 ·
Smaay said:
GSBoek said:
Depending on which way the thermo is bad will give different CELs depending on wether the treasholds have been reached or not. If a thermo is stuck open, engine will not warm up enough and will stay in open loop, you will get a CEL for coolant temp insufficient, open loop. If thermo is stuck closed you will be running hotter than desired, will through a CEL for overheating if the upper treashold is reached.
I'm sure you know that 5 minut trips arent good for your engine though.


wrong wrong wrong

a thermostat has no way possible to throw a CEL. there are no electronics from the CEL to send a signal to the ECU. if you are having trouble overheating try bleeding your cooling system...
I know it's the thermo... Had it double-checked. I replaced the coolant correctly when it was in the shop. Then I got the car back and it overheated so I took it to a shop by my work to check it out (same shop that my GNs are at). They checked and it was the thermo. I guess I need to go to AutoZone and have them check my code...
 

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It's probably something stupid like a 0420
 

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still dosent sound like thermostat. its very difficult to bleed the cooling system in the celica...
 

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Isn't the only way to check the thermostat is by removing it?

Even if your lower hose isn't warm, it doesn't mean that the reason the coolant isn't circulating because of the thermostat.
 

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Discussion Starter · #10 ·
SickCelica696 said:
It's probably something stupid like a 0420
Actually I had it checked yesterday and there were 2 codes 0420 and 0420 with some symbol after it :confused: Now I know what the code is for - I ran without an axhaust for a couple years and I think I will need a new cat for the CEL to go away but I don't understand the second code.
Smaay said:
still dosent sound like thermostat. its very difficult to bleed the cooling system in the celica...
Well I tried and thought I did it well and took it to a shop and they did it as well so I would think they would have done it right... well we'll see once the thermo goes in. Worst case scenario is I have another JDM mod :shrugs:
 

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Yea sometimes you'll get a p0420 A or B or something.. All means the cat is working less than the car would like.. while it doesnt do any harm it just leaves the annoying light on
 

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Discussion Starter · #12 ·
SickCelica696 said:
Yea sometimes you'll get a p0420 A or B or something.. All means the cat is working less than the car would like.. while it doesnt do any harm it just leaves the annoying light on
yeah I've dealt with it for years. Sometime after my car's show ready I'll buy a high flow cat
 

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Smaay said:
wrong wrong wrong

a thermostat has no way possible to throw a CEL. there are no electronics from the CEL to send a signal to the ECU. if you are having trouble overheating try bleeding your cooling system...
There is no electronics between thermo and ECU, true, but a bad thermo on its own can cause the conditions that will throw a CEL. If all else on your engine is working properly, a stuck thermo will impede the flow of coolant to the radiator, the engine will probably overheat and that will definitely throw a CEL.
 

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wrong again!!! overheating will not cause a CEL on the celica...the temperature gauge will flash...not untill you sieze the motor will the CEL light up, and thats cause the motor stopped and the key is on...
 

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Right you are, hahaha, I just never realized the Celica didn't throw a CEL on overheating.
 

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should throw a CEL. The thermostat on my girl's 2002 solara had a bad thermostat and it threw CEL P0128... Got the thermostat replaced and the CEL is gone... maybe celicas don't threw a cel for bad thermostat?
 
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