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  #1  
Old 11-01-2018, 03:11 PM
meysabri85 meysabri85 is offline
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Join Date: Feb 2012
Posts: 53
Default PCM relay not getting power to pin 86 in underhood junction box

My Ranger 1999 2.5L 2WD in trouble again. Died out on me, no fuel pump hum, checked relays and seemed ok. Removed the bed, checked the pump and it was dead. I replaced the pump and checked it . Ignition on but no priming and no spark. Checked fuses/ok, replaced PCM relay and still no priming and no spark. Checked inertia switch/ok. At the PCM relay socket at the junction box checked constant power to where pin 30 goes and it's ok, checked ground where pin 85 goes, and it's grounded, checked where pin 87 should go and seems ok but the slot where pin 86 goes is dead, no power in there even with the ignition in ON position. So I put a wire from the 12V battery into the 86 pin slot in the junction box, put the PCM relay back and it fired right up, but engine won't turn off until I remove the wire to pin 86. That seemed ok,but next to the PCM relay there's the electronic engine control diode and it heats up if the engine is running through the means I just described. It heats up to the point of melting the hard plastic ,so I figure there's something not right. Does anyone know what I'm talking about and what could be wrong? Please help
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Ford Ranger XL 1999 4X2 2.5L-manual transmission

Last edited by meysabri85; 11-01-2018 at 03:22 PM.
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  #2  
Old 11-03-2018, 04:03 PM
meysabri85 meysabri85 is offline
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Join Date: Feb 2012
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Default Re: PCM relay not getting power to pin 86 in underhood junction box

Never mind, you guys, it was fuse 19, 25 A. That fuse feeds the PCM relay. The strange thing is that I had checked all fuses like I mentioned and all were fine. Now, the truck is running and fires right yo and the diode isnt overheating like before
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  #3  
Old 11-04-2018, 06:29 AM
dvrich dvrich is offline
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Default Re: PCM relay not getting power to pin 86 in underhood junction box

Fuses blow for a reason, find out why or the fuse will blow again.
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Last edited by dvrich; 11-04-2018 at 06:32 AM.
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