2001 F-150 O/D light flashing. Checked it with 2005 Snap On Graphing Scanner- [with no trouble shooter updates] Code reads PO 712...........

Scanner translates "Trans-Coolant temp sensor out of range". Need help. What Is this problem? Is it simply the sensor? IF So- would this sensor be internal or external?
Or is there something else that I need to be checking for?

This just started today. Shifting fine, just O/D light flashing. Fluid looks great.

Any help is appreciated!

 

sounds like a bad sensor to me. don't know whether its internal or external though, sorry.

 

Thanks. I am not sure either, but if ANYBODY would do something stupid, like putting it on the INSIDE, it would be Ford...........

 

Yea only Ford would do that heh!
Where do you think the fluid temp would be measured by the sensor if not in where the fluid is?

 

Yes, it's inside the pan.

Before changing it, how warm was the trans when you ran the test? I believe that code means the trans was either too cold or too hot when the test was run.

 

I would suspect a wiring connection or harness fault first.

For the sensor to cause this code would require it to short cicuit which is an extraordinarily rare occurance for a thermistor.

Use that fancy Snap-on to monitor the TFT_PID and see what it's actually reading during operation.

Of course (as mentioned), the Transmission Fluid Temperature sensor is in the fluid inside the pan.

Steve

Steve