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Originally Posted by hot_sd
I guess that should be it. I have a 2000 metro and the control system is different to the older cars. In mine the powertrain control module (PCM) controls both the tranny and the engine. In older cars I believe the 2 are separate. In any event it should be the module that the wiring harness goes from the tranny.
It is very probably that the circuit used to generate the 2V control source may have gone bad. It is probably a voltage reg or a zener type circuit that drops the 12V down to 2V. Sometimes a passive component like a resistor or a cap going bad can start getting worse under changing temperature conditions.
If this is the case the fix should be simple but I'm not sure if the module can be opened and if a circuit diagram of the micro and the support circuity would be available. The more expensive option would be to replace the TCM.
Another thought on how to prove if it is the TCM is to get some freezer spray and chill the module when it is hot and the problem is there and see if the problem goes away. This should prove whether it is the
module or something else.
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I'll wait till the cold weather hits us again this week, that will tell the tale, I have located a used one for 20.00. If it proves to be the problem. I wonder if there is a way or parts referance to see the mudule number and how many differant geo's or Suzuki's had the same part.
Thanks
Tom