p 0483 code - ANYONE?????

[mr plow]

which is this code?



thanks



oren.

 

[Pawpaw]

"Cooling Fan Rationality Check Malfunction"



According to http://autorepair.about.com/cs/troubleshooting/l/bl_obd_main.htm



Don't know how much good that will do.

 

[rbattelle]

If someone doesn't beat me to it, I'll look it up in the Powertrain Diagnostics Manual when I get home this evening.

 

[mr plow]

i think i know what it is...

found out today that the transmission cooling lines are leaking... . just a possibility...

 

[rbattelle]

As Promised...

According to page 149 of the Powertrain Diagnostics Manual,



P0483 - Fan Speed

Set Condition: the actual fan speed does not match the commanded fan speed.



There's a huge list of troubleshooting steps and possible causes. Here's a few possible causes:



-Signal circuit short to supply circuit.

-Signal wire open from ECM to fan clutch assembly

-Signal circuit shorted to ground inside the ECM



I'd say either the fan clutch is toast, or there's a problem with the electrical connector. If you don't want to take it to the dealer, I recommend unplugging the electrical connector at the fan clutch and cleaning it out good. Then check for continuity with ECM pin 10 on connector C2 (it's the smaller of the 2 connectors... 50 pins).



If that checks out, plug it back into the fan clutch and carefully monitor your coolant temperature. The code will clear after 40 consecutive warmup cycles without the problem appearing again.

 

[sag2]

Make sure the wiring did not get into the fan. Several of the harnesses have got loose and the fan takes them out in a hurry.

 

[sag2]

All the codes are listed in the 3rd gen FAQ