Toyota corolla check engine light
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From: Jeff Strickland on 18 Jul 2007 01:33 "Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message news:N-KdncfmtIHKsgHbnZ2dnUVZ_saknZ2d(a)comcast.com... > > "Jeff Strickland" <crwlr(a)verizon.net> wrote in message > news:4ANmi.449$SM6.263(a)trnddc01... >> >> "Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message >> news:6Yqdna9muM7MZQfbnZ2dnUVZ_rmjnZ2d(a)comcast.com... >>> >>> "Devils Advocate" <devilsadvocate66(a)hotmail.com> wrote in message >>> news:469ad4a4$0$8824$9a566e8b(a)news.aliant.net... >>>> scan result say " inproper coolant temp" or something to that effect. >>>> >>>> Does this mean just as it says, the coolant needs replacement. >>>> >>>> It is good for about -20 >>>> >>>> >>> I would help to know what model and model year Corolla, how many miles >>> are on the odometer, recent service history, and actual diagnostic >>> trouble code ("DTC"), i.e. P115, P116, etc. >>> >>> The electronic control unit monitors engine coolant temperature through >>> the coolant temperature sensor for the ECU, but IIRC, the trouble can >>> also indicate a leak in the exhaust system. >>> -- >> >> >> How do the exhaust and coolant temp tie together Ray? (I'm not suggesting >> you are wrong, I'm suggesting I don't know what the relationship is among >> these disparate systems.) >> > > If DTC P0125 - Insufficient coolant temp for closed loop operation - comes > up, then the thing to check is the heated O2 sensor and exhaust leaks. > IMO, the SAE description is misleading and confusing, one of the few times > it is. > Okay, so there is no direct link between coolant temp and an exhaust leak, the trouble here is that the fault code is misleading? I don't see how a leaky exhaust (I assume the manifold and not the tail pipe) would make the coolant temp too low. That was my real question, but if the code is a bit flakey in its description, then I'll buy the whole thing about the exhaust. That is confusing, the coolant is cold so check the exhaust ...
From: Ray O on 18 Jul 2007 02:34 "Jeff Strickland" <crwlr(a)verizon.net> wrote in message news:5Dhni.12944$LH5.9299(a)trnddc02... > > "Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message > news:N-KdncfmtIHKsgHbnZ2dnUVZ_saknZ2d(a)comcast.com... >> >> "Jeff Strickland" <crwlr(a)verizon.net> wrote in message >> news:4ANmi.449$SM6.263(a)trnddc01... >>> >>> "Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message >>> news:6Yqdna9muM7MZQfbnZ2dnUVZ_rmjnZ2d(a)comcast.com... >>>> >>>> "Devils Advocate" <devilsadvocate66(a)hotmail.com> wrote in message >>>> news:469ad4a4$0$8824$9a566e8b(a)news.aliant.net... >>>>> scan result say " inproper coolant temp" or something to that effect. >>>>> >>>>> Does this mean just as it says, the coolant needs replacement. >>>>> >>>>> It is good for about -20 >>>>> >>>>> >>>> I would help to know what model and model year Corolla, how many miles >>>> are on the odometer, recent service history, and actual diagnostic >>>> trouble code ("DTC"), i.e. P115, P116, etc. >>>> >>>> The electronic control unit monitors engine coolant temperature through >>>> the coolant temperature sensor for the ECU, but IIRC, the trouble can >>>> also indicate a leak in the exhaust system. >>>> -- >>> >>> >>> How do the exhaust and coolant temp tie together Ray? (I'm not >>> suggesting you are wrong, I'm suggesting I don't know what the >>> relationship is among these disparate systems.) >>> >> >> If DTC P0125 - Insufficient coolant temp for closed loop operation - >> comes up, then the thing to check is the heated O2 sensor and exhaust >> leaks. IMO, the SAE description is misleading and confusing, one of the >> few times it is. >> > > Okay, so there is no direct link between coolant temp and an exhaust leak, > the trouble here is that the fault code is misleading? I don't see how a > leaky exhaust (I assume the manifold and not the tail pipe) would make the > coolant temp too low. That was my real question, but if the code is a bit > flakey in its description, then I'll buy the whole thing about the > exhaust. That is confusing, the coolant is cold so check the exhaust ... > A leaky exhaust will not make coolant temp too low so the description is misleading ;-) -- Ray O (correct punctuation to reply)
From: Jeff on 18 Jul 2007 08:06 Ray O wrote: > "Jeff Strickland" <crwlr(a)verizon.net> wrote in message <...> >> Okay, so there is no direct link between coolant temp and an exhaust leak, >> the trouble here is that the fault code is misleading? I don't see how a >> leaky exhaust (I assume the manifold and not the tail pipe) would make the >> coolant temp too low. That was my real question, but if the code is a bit >> flakey in its description, then I'll buy the whole thing about the >> exhaust. That is confusing, the coolant is cold so check the exhaust ... >> > > A leaky exhaust will not make coolant temp too low so the description is > misleading ;-) I suspect that the catalytic converter doesn't get hot enough to work efficiently. Jeff
From: Ray O on 19 Jul 2007 00:54
"Jeff" <kidsdoc2000(a)hotmail.com> wrote in message news:1nnni.6280$2o5.3324(a)trnddc03... > Ray O wrote: >> "Jeff Strickland" <crwlr(a)verizon.net> wrote in message > <...> >>> Okay, so there is no direct link between coolant temp and an exhaust >>> leak, the trouble here is that the fault code is misleading? I don't see >>> how a leaky exhaust (I assume the manifold and not the tail pipe) would >>> make the coolant temp too low. That was my real question, but if the >>> code is a bit flakey in its description, then I'll buy the whole thing >>> about the exhaust. That is confusing, the coolant is cold so check the >>> exhaust ... >>> >> >> A leaky exhaust will not make coolant temp too low so the description is >> misleading ;-) > > I suspect that the catalytic converter doesn't get hot enough to work > efficiently. > > Jeff I don't think that coolant temp will affect catalytic converter temperature because the exhaust still comes from the combustion process. -- Ray O (correct punctuation to reply) |