Engine shut off while driving will not start

Tiny
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No, are you sure you had a good ground on your voltmeter? Those fuses are supposed to be hot all the time from the battery.
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Monday, January 1st, 2018 AT 12:58 PM
Tiny
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Just re-checked, same result. #6 ASD fuse, and #24 fuel pump fuse = no power.
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Monday, January 1st, 2018 AT 1:13 PM
Tiny
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And other fuses in that PDC do have power, so the voltmeter ground is okay?
If so, then that is your problem, those two fuses are not getting power. If they all are not getting power and you are sure the ground is okay, check the main feed to that PDC. If some fuses do have power but just not those two or even a few more, then the problem is inside that PDC and could be something shorted out inside it, maybe melted, rusted, etc.
If you could remove it and take it apart, you should be able to see what is going on inside it and it may be obvious, or you could test it with an ohmmeter once it is apart, from the main lug to those two fuse spots.
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Monday, January 1st, 2018 AT 1:18 PM
Tiny
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Should everything in that panel be "hot"?
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Monday, January 1st, 2018 AT 1:38 PM
Tiny
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Most them if not all of them. I am not at my PC now to look up the wiring diagram I am on a tablet. But I do believe they are all hot all the time.
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Monday, January 1st, 2018 AT 1:46 PM
Tiny
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Okay, because there were several other of the blade style fuses that were cold. I did not get into all the "ice cube" fuses. I will pull the panel out and take a look inside. Burr fourteen degrees.
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Monday, January 1st, 2018 AT 1:51 PM
Tiny
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Okay, if all them all not hot check for voltage first at the main lug that feeds that entire box.
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Monday, January 1st, 2018 AT 1:54 PM
Tiny
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I was checking wrong. Everything seems to be hot. Oops. Using main lug as my ground before. Been a long couple days. Now jumper brown ground?
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Monday, January 1st, 2018 AT 2:17 PM
Tiny
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No, what about those other fuses, the #16 and #26, in that PDC? Now for those the key does have to be on run, because it is the ASD relay that powers those.
So there were some in there that were not hot all the time.
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Monday, January 1st, 2018 AT 2:27 PM
Tiny
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I will recheck everything tomorrow and let you know. Getting too dark out to see. Thanks for your help today. I feel like I am getting somewhere. Wife will be happy.
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Monday, January 1st, 2018 AT 2:34 PM
Tiny
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Okay.
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Monday, January 1st, 2018 AT 2:34 PM
Tiny
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Fuse #12 (under dash) = hot
#24 (under hood) = hot
#6 = hot
#16 = 0 volts
#26 = 0 volts
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Tuesday, January 2nd, 2018 AT 10:54 AM
Tiny
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Did you remember to turn the key to run when checking those #16 and #26? If yes, than replace that ASD relay.
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Tuesday, January 2nd, 2018 AT 12:44 PM
Tiny
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Yes key was on. Swapped ASD relay with one from other jeep. No start. Didn't affect other jeep either.
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Tuesday, January 2nd, 2018 AT 1:12 PM
Tiny
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Do you have voltage at them fuses #16 and #26 now with the key on run, after swapping in a asd relay?
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Tuesday, January 2nd, 2018 AT 2:23 PM
Tiny
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No. 16 and 26 are 0 volts.
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Tuesday, January 2nd, 2018 AT 3:20 PM
Tiny
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Ok, I don't believe the fuel pump relay will work until the pcm gets it's power from that asd relay and then fuses #16 and #26, so there is a dark blue/yellow wire coming off that asd relay that goes to pin #3 of the pcm. The pcm has to ground this wire in order to activate that asd relay, so let's ground this wire and turn the key to run and see if that asd relay activates, then powers them fuses 316 and #26 and also now power the fuel pump relay and the fuel pump.
If so, then make sure the connector at the pcm is good and tight. If it is you might be looking at a bad pcm, but first disconnect each end of that dark blue/yellow wire and using on ohmmeter, make sure it is ok. Ballpark ohms is 5 ohms. It should be lessor equal to 5 ohms. If it's more the wire is bad. If it's good, also make sure it isn't shorted to ground so place one end of the ohmmeter on that wire, anywhere, then the other ohmmeter test lead on a good metal ground or the negative battery post, if it will reach and it should read infinity or 1 on some digital ohmmeters. I means infinity.
If it reads anything at all, then it's shorted to ground. If so, replace that wire with the same gauge, color and length. If it comes down to a possible bad pcm, you should at least retrieve the trouble codes first before replacing and programming the pcm.
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Tuesday, January 2nd, 2018 AT 3:47 PM
Tiny
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I'm just about to check those last things you listed. Meanwhile, is there a switch I need to reset after being towed. Everything I have found says no, but the interweb can be unreliable sometimes.
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Wednesday, January 3rd, 2018 AT 1:33 PM
Tiny
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No on a switch reset.
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Wednesday, January 3rd, 2018 AT 2:58 PM
Tiny
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Grounded asd relay, turned key on. Power to 16 and 26. Fuel pump still doesn't run. I'm working on tracing wire to check resistance. Or should I wait, since the pump isn't doing anything.
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Wednesday, January 3rd, 2018 AT 3:12 PM

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