Does anyone have info on how the EEC schedules the shifting on an automatic transmission with respect to the transmission fluid temperature?

I just installed an auxillary transmission fluid cooler and the shifts seem to be harder during the first 5 mins of driving. I'm wondering if this is due to thicker fluid or if the EEC is changing the way it shifts due to colder fluid.

Thanks.

 

What's the PCM code of the vehicle?

 

PTP2.

I'm looking for the different ranges of temperatures where the EEC does something different with shifting or lock up or line pressure. This, coupled with other bits and pieces of information I've found, should tell me what Ford considers cold, warm, normal, hot, boiling, etc.

Thanks.

 

I'll take a look when I get back to work tomorrow. I don't have the key to my tuning software with me right now so I can't look it up....

 

I found this in the Service Manual...

The transmission fluid temperature (TFT) sensor is located on the lead frame assembly near the shift solenoids on the main control valve body. It is a temperature-sensitive device called a thermistor. It sends a voltage signal to the PCM. The voltage signal varies with transmission fluid temperature. The PCM uses this signal to determine whether a cold start shift schedule is necessary. The shift schedule is compensated when the transmission fluid temperature is cold. The PCM also inhibits (TCC) operation at low transmission fluid temperatures and corrects electronic pressure control.

The bolded part is what I was interested in. What are the temperatures where the shift schedule changes? What temperature does the PCM inhibit TCC lockup? What does it do to the electronic pressure control? When?

Thanks again.

 

I'm looking at the transmission oil temp scalers for these, its 85. Max time to spend in cold shift mode is 900 seconds (15 minutes). The shift pressure multiplier goes from negative 50 all the way to 300 degrees.

 

What's at 85? Below that temp is when it uses the cold shift schedule?

What temps are the pressure multiplier at 0? That could be the optimal range.

Thanks.

 

85 and below it uses different shift pressure. As to the other question... I'm really swamped and don't have a lot of time to go digging into that code again. With a very pregnant wife/business partner I'm doing double duty these days.

 

That's ok. Thanks. Good luck with the pregnancy.