CrossfireForum - The Chrysler Crossfire and SRT6 Resource - View Single Post - Fan relay module same for all Crossfire models?

Jun 17, 2013 | 02:48 PM

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Cal_Cobra

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Joined: Jul 2008

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From: Brentwood, CA (no not the OJ Simpson Brentwood, the real city of Brentwood in NorCal)

Re: Fan relay module same for all Crossfire models?

Interestingly the gentlemen I purchased the replacement fan control module from is a MB tech. He had this to say about troubleshooting the issue and thoughts about what's the most probably real culprit, the ECM (god I hope not, that will be an expensive repair

):

"yes if put on max ac the fan will run only if the high side pressure reaches a certain threshold like 350 lbs,375lbs,etc just depends on model of car. anyway a few checks you can do in a few minutes with a volt/ohm meter would be,with key off, unplug the connector at the pwm (should have 6 wires). the sockets are number on connector. socket # 3 is 12 volts and socket # 2 is ground. sockets #1 & #4 go to fan,can test for continuity with ohm meter to fan connector for each wire to make sure there is no broken wire. socket #6 is switched power(12 volts with key on). now if those are all in order the next step is socket #5 -this comes from your engine control unit/fuel management cu this is a pulse width modulated signal that cannot be measured with a normal volt meter. this requires a scope to see. this is the magic that tells when and how fast the fan needs to run to the module you bought from me. note- if socket #3 is not 12 volts with key off -there is a 50 amp fuse blown. like i said before usually if the fan module is bad the fan runs 100% (limp mode). usually if i see coolant light on dash and fan inop its likely an expensive engine control module. that would suck because you can not use a used part -those need to be a virgin part and then coded to car. just do the test to see if it is something stupid. then i hope my gut feeling is wrong."

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