View Single Post
Old 06-13-2005, 01:36 AM   #5
sierrap615
Master Member
sierrap615 is on a distinguished road
 
sierrap615's Avatar
 
Join Date: Aug 2003
Location: Downers Grove, Illinois
Posts: 2,538
 
Default Re: Wolfman's Guide for Diagnosing the Radiator Cooling Fan

the fan relay is directly controlled by the PCM and is only controlled by the PCM.

the PCM will turn on the fan if it sees:

the PCM is in diagnostic mode

-OR-

the ECT reads above appox. 220 F
AND
the engine is running

-OR-

the A/C request is on(or for appox. 40 seconds after the A/C is turned off)
AND
the engine is running


if the ECT never read above 193 F it is most likely bad. -40 is the standard minimum reading for all temperator sensors that i know of.

REWARD EXCELLENCE!

Add to sierrap615's Reputation
Rate the quality of this post and help sierrap615 reputation points. Click the reputation button near the bottom left corner of this message box. Thank you!
sierrap615 is offline