Bruce Amacker Posted February 22, 2012 Share Posted February 22, 2012 Email from student: My question is have you ever seen a 2002 F-450 have a problem of killing the engine when the windshield washer is used. By wiring diagrams I don’t see any connection. The harness looks good in the steering column. I even changed the multifunction switch just in case but that didn’t work. It will not usually kill it the first time you hit the button but about after 4-6 times it will die like you shut it off. It will restart. Battery voltage is fine. I'm kind of stumped on this one and don't know what to respond. The closest one I had like this was a 7.3 that would surge and stall when the turn signal was turned on, the problem ended up being the insulation became conductive on the green CMP sensor wire and cross bled voltage from the TS circuit into the CMP circuit. (I proved this with a scope, it was very weird). My gut instinct is a bad harness or bad ground somewhere. Any comments? Thanks! Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted February 22, 2012 Share Posted February 22, 2012 Bruce my thought is similar to yours in that it would have to be some sort of harness issue... Quote Link to comment Share on other sites More sharing options...
mchan68 Posted February 23, 2012 Share Posted February 23, 2012 Water in the GEM? Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted February 23, 2012 Share Posted February 23, 2012 Water in the GEM? No GEM on a 2002. I was thinking the same thing until I remembered that model year the GEM functions were split up into the cluster, VSM, 4X4 module and of course, the wiper motor. The wiper motor itself contains the microprocessor for the motor and washer control. Quote Link to comment Share on other sites More sharing options...
lmorris Posted February 23, 2012 Share Posted February 23, 2012 What about the under dash fuse panel. Have seen many an issue because of water intrusion. Isn't the PCM power relay part of that fuse panel? Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted February 23, 2012 Share Posted February 23, 2012 Fuel pump relay is. Quote Link to comment Share on other sites More sharing options...
lmorris Posted February 24, 2012 Share Posted February 24, 2012 So it is possible that this may be the culprit. Depending on how the truck stalls out I suppose. Quote Link to comment Share on other sites More sharing options...
mrbudge Posted February 24, 2012 Share Posted February 24, 2012 I have seen a number of different systems on vehicles create interference and wash out crank or cam signals, including interference from electric motors. The details are fuzzy, but I remember fixing one by putting a capacitor actoss the power and ground on the motor to act as a noise suppressor. Quote Link to comment Share on other sites More sharing options...
Aaron Posted April 9, 2012 Share Posted April 9, 2012 Harness that comes out of the truck at the firewall all mangled up/soaked with oil causing the insulation to deteriorate? Something shorting out in the column wiring? Quote Link to comment Share on other sites More sharing options...
Alex Bruene Posted April 9, 2012 Share Posted April 9, 2012 I've had a 6.0 with the same concern. Replacing the wiper motor fixed it. It was so long ago, I can't remember how we came to that conclusion. Quote Link to comment Share on other sites More sharing options...
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