TCC only works when cold - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-07-2005, 01:42 PM   #1
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Default 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
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Old 06-08-2005, 12:45 AM   #2
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Are you getting a "Check Engine" light at all?
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Old 06-08-2005, 02:07 AM   #3
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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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Old 06-08-2005, 07:10 AM   #4
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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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Old 06-08-2005, 10:22 AM   #5
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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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Old 06-08-2005, 12:36 PM   #6
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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 *.
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Old 06-08-2005, 12:38 PM   #7
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no you have the OBD 1 1/2 and I have had problems with Advance reading the OBD 1 1/2
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Old 06-08-2005, 12:59 PM   #8
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Quote:
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
Me too. It'* due to the fact that it is NOT an OBDII system. The actron scanner'* they use are OBD II only. They even say on their sign somewhere that if you have a 96 and newer car we can scan your car. I don't know what the manufacturers were thinking during the OBD I to OBD II transistion period. There are tons of cars out there within the 93-95 range that have OBD II connectors with an OBD I system. 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.
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Old 06-08-2005, 01:07 PM   #9
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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 *.
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Old 06-08-2005, 04:25 PM   #10
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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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