TCC only works when cold
Thread Starter
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Joined: Apr 2004
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TCC only works when cold
Hello all.
I'm about to take off on a long trip and would like to achieve the highest mpg I can. Lately, my TCC on works when the engine/tranny are cold. Once warm and after making a stop, the TCC will disengage and remain that way until the car completely cools.
I was wondering if there is a quick fix to this problem. I read once that a deffective temperature sensor somewhere may to blame.
What do you think?
Thanks!
Larry *.
'94 SSEi
I'm about to take off on a long trip and would like to achieve the highest mpg I can. Lately, my TCC on works when the engine/tranny are cold. Once warm and after making a stop, the TCC will disengage and remain that way until the car completely cools.
I was wondering if there is a quick fix to this problem. I read once that a deffective temperature sensor somewhere may to blame.
What do you think?
Thanks!
Larry *.
'94 SSEi
Senior Member
Posts like a Corvette
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From: Bolingbrook, IL Location: Clarkston, MI
Is your fuel pump loud? It could be a fuel pump. Same problem on the Trans Sport and it was the fuel pump. Also pressure was perfecly fine at idle. . . .so check when you are having the problem. . . . .
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From: Groton, CT _NEBF 05, 06, 07_
Yeah, I think there is a TCC engage inhibit until the engine comes up to normal op temperature. Input from the ECT sensor is what is the controlling factor. The transmission also has a temp sensor internal. The 92-99 guys will chime in here soon.
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Codes on the car need to be checked... We also need to know what the PCM is seeing...
the 94-95 PCM'* act in a diffrent manner,
If you are at the right speed, even with a cold engine, say you crank the car and a minute later you are on the highway, by the time you get to 60-70 the TCC will be commanded on due to roadspeed...
Once up to temp you should have the TCC activate at 36-40 mph in Drive, and 46-50 in OverDrive....
Chances are you will not get the SES light, but you may have a stored code... Again you need to know what the PCM is seeing from all of the sensors that relater to the TCC and what its trying to do....
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the 94-95 PCM'* act in a diffrent manner,
If you are at the right speed, even with a cold engine, say you crank the car and a minute later you are on the highway, by the time you get to 60-70 the TCC will be commanded on due to roadspeed...
Once up to temp you should have the TCC activate at 36-40 mph in Drive, and 46-50 in OverDrive....
Chances are you will not get the SES light, but you may have a stored code... Again you need to know what the PCM is seeing from all of the sensors that relater to the TCC and what its trying to do....
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Thread Starter
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The SES light DOES come on intermittently. I had an Autozone attempt to pull the codes but a connection to the ECM couldn't be made so no codes were retrieved. This is an ODB I system, right?
I don't notice the fuel pump being any louder than normal.
Thanks for the help so far.
--Larry *.
I don't notice the fuel pump being any louder than normal.
Thanks for the help so far.
--Larry *.
Senior Member
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Originally Posted by 1993 SLE
no you have the OBD 1 1/2 and I have had problems with Advance reading the OBD 1 1/2
I mean come on, either change the system entirely or don't do it all. This "hybrid" between the two is nothing by a pain in the arse.
Thread Starter
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Does anyone have any tips for retrieving stored codes from the so called ODB 1 1/2 systems?
Has anyone used WinALDL (http://winaldl.joby.se/) ???
Thank you,
Larry *.
Has anyone used WinALDL (http://winaldl.joby.se/) ???
Thank you,
Larry *.
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I'll have to Tech info an explanation when I find the time...
Yes the 94-95 H and C bodies with the 3800'* are OBD1 compliant, but they use an OBD2 connector and OBD2 codes...
The problem is that everyone looks at the connector on a GM and if its not an ALDL they think its a full on OBD2 system because it had the 16 pin OBD2 connector...
But what you need to scan this car and or cars is a scantool that will read 94-95 GM cars with an OBD2 connector... Most OBD1 scantools like the Actron 9110 will read these cars with the 16 pin OBD2 connector...
I also have an actron that will read all 84-95 GM'* with either connector...
Keepp in mind that in 95 there were a few models that already supported the OBD2 system...
This can get a bit confusing, but these 94-95 Bonneville can be scanned with an OBD1 scantool capeable of reading GM cars with the aid of the OBD 2 connector...
Good Luck
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Yes the 94-95 H and C bodies with the 3800'* are OBD1 compliant, but they use an OBD2 connector and OBD2 codes...
The problem is that everyone looks at the connector on a GM and if its not an ALDL they think its a full on OBD2 system because it had the 16 pin OBD2 connector...
But what you need to scan this car and or cars is a scantool that will read 94-95 GM cars with an OBD2 connector... Most OBD1 scantools like the Actron 9110 will read these cars with the 16 pin OBD2 connector...
I also have an actron that will read all 84-95 GM'* with either connector...
Keepp in mind that in 95 there were a few models that already supported the OBD2 system...
This can get a bit confusing, but these 94-95 Bonneville can be scanned with an OBD1 scantool capeable of reading GM cars with the aid of the OBD 2 connector...
Good Luck
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