I had this one posted in the 3rd gen section, but no one could help me. Maybe you guys can. My PFC reads the water temp at about 35 degrees celcius when fully warmed up., which most of you all probably already know is too low. Anyway, because it doesn't give the accurate reading of between 85 - 100, it won't let me punch the gas, it cuts the fuel or something at about 4000 rpm's. The temperature sensor is fine, because the stock guage in the instrument panel reads the usual temperature(right in the middle). This means that I either have a bad PFC, or their has to be a way to change this. Any help would be great.
Thanks.

 

TRY SEARCHING THE FORUM, I think I saw something on this a while ago.

 

the sensor for the gauge and ECU are two differtn ones. soudns liek your waterthermosensor is bad.

 

mine is doing the same exact thing and its driving me nuttz. any help would be appreciated. cant tune the car right without the water temp sensor reading right

 

verify that you have it hooked to the water temp sensor (and not the fuel temp sensor, which is the same style connector). if the checks out, you need a new sensor. I had to replace mine (88 model) and my friend had to replace that sensor on his 94.

 

This is all very basic trouble shooting covered in the FSM.

Time for you-all to start reading/studying.

http://foxed.ca/foxed/index.php?page=rx7manual

 

do you honestly think i would post this if i didnt check the harness and change the sensor???? gimme a lil credit.. the PFC is reading 35 all the time no matter what. i cant tune the car til i get this dealt with, im gonna troubleshoot the wiring tomorrow.

 

Then it can not be the harness or sensor, so that leaves the PFC. That is if your harness and sensor tests were valid.
We want to here what your final problem was after it is fixed. If not, we will assign the problem as operator error.

 

yeah thanks for all the help............ it was a knicked wire in back the harness up under the intake.

 

so what would considered to be the normal water temperature if you guys don't mind just quickly provide me with some inputs

 

80-100°c

 

they say stock... the first fan doesn't come on til 224F. to me thats way too hot. since i got my temp sensor working right. i set my fans to 85C......... it never runs over 190F that is what you are looking for

 

Bump!

I'm having the same problem as the o.p.

The water temperature reading on the commander is 35degrees.

The thermister is perfect and within specifications of the user manual.

The more the temperature rises the lower the temperature read by the PFC. Another suspicious thing is that sometimes when I have the datalogit reading from the PFC the water temperature appears as 0 or 1 degrees.

could be a faulty wiring or a messed PFC? Are there any possibilities of re-flashing the PFC?

Any ideas?????