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Old 09-19-2019, 09:01 PM
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Jeep Died.

Yesterday after arriving in Silverton decision to do an evening drive to Animas Forks. Half way there decided to turn around cause it was getting dark. While driving the Jeep just slowed down and stopped. It would crank but not fire. Checked the codes and had p0688 and p2314. Cleared the codes, tried to start but no luck. Checked the codes again and had the p0688. Luckily someone came by and called help for us. Get t a ride to town and the Jeep was picked up this morning. They can't figure out t what's wrong or how to fix it. So tomorrow it's being towed to Albuquerque where I live. Bummer of a trip.

Anyone have a god idea how to fix this? Google didn't have good or specific answers.

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Old 09-19-2019, 09:14 PM   #2
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This is what I found:
https://www.obd-codes.com/p0688

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Old 09-20-2019, 10:01 AM   #3
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How familiar are you with the ASD relay and what it does?

The ASD relay, like all relays has a control side and a load side. The control side is the magnetic coil in the relay. It gets battery pos from the TIPM and the PCM grounds the coil when it wants the ASD relay to turn on. When the PCM wants the engine to run, it has to ground the ASD relay.

The load side of the ASD relay, gets battery pos from the TIPM and when the relay activates, it sends power to ignition coils and fuel injectors. Also on the output of the ASD load side is a wire that goes back to the PCM. It is there for the PCM to know that the ASD relay has been switched on. Kind of like a confirmation.

The P0688 is a code that the PCM activated the relay through the control side but it didn't see the 12v come through on that wire from the load side to the PCM. You will need to look at that ASD circuit and see what it's doing. It may very well be the relay is bad or it could be wiring or the PCM.

I'd start with swapping the relay and see if it cures the problem. After that you need to go into troubleshooting the circuit.
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Old 09-20-2019, 12:29 PM
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Swapped the relays around and no change. Getting towed today. Boo.
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Old 09-20-2019, 01:49 PM   #5
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Check fuse M19. Should be a 25a fuse.

According to the wiring diagram I have access to, that is on the load side output. Make sure that the fuse is good before having it towed.
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Old 09-20-2019, 01:52 PM   #6
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Also check M21. That shows ASD related too.
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Old 09-24-2019, 03:23 PM   #7
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Any update?
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Old 09-25-2019, 08:08 AM
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Not yet. Hope to find out something today.
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Old 09-26-2019, 02:48 PM
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Picked up fr m dealer shop. Ran fine till driveway. Then died just like in Silverton. Same codes. This sucks. They replaced a relay and #5 coil. That was cracked. Will see now what the issue is.
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Old 09-26-2019, 03:09 PM   #10
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Does "same codes" mean that you still have P2314 as well?
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Old 09-26-2019, 11:29 PM
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Yes. Had codes p 0688 and p2314 both in Silverton and again today pulling into y driveway. Last time they were able to change a fuse and limp,it into the shop. Today it would plow the fuse right away. They had replaced a relay and cylinder 5 ignition coil. It had exploded, only the 4 th one they had seen do that. I'll try to get a photo to,or row of it. The only thing I'm glad about is that it happens at my house and not half way to Silverton or on a trail.
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Old 09-27-2019, 10:20 AM   #12
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Frustrating. Thanks for keeping us updated and pouring the knowledge back into the pool. Will be interested in what you get figured out. Sounds like a pretty bad short somewhere.
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Old 10-02-2019, 11:07 AM
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As of last evening still no word on jeep. They are troubleshooting the short wire by wire. No word on when it'll be done. Ug.
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Old 10-02-2019, 02:23 PM
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It appears to be the TIPM. New one in order and I'll go in tomorrow. Then we'll see. This is getting expensive.
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Old 10-02-2019, 02:30 PM   #15
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My 14 is all out of all warranties and this kind of thing just scares the $$$$$ out of me.
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Old 10-02-2019, 02:31 PM
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I feel the pain.
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Old 10-04-2019, 02:35 PM   #17
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Is a replacement TIPM a DIY job?
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Old 10-04-2019, 03:00 PM   #18
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Is a replacement TIPM a DIY job?
Depends. You have to program a new or replacement TIPM. That is usually the barrier to getting it done for most. Install is just undoing connectors and unbolting. Then bolting in and putting connectors back in.
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Old 10-05-2019, 06:11 PM
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New TIPM and still blowing fuse and cylinder 5 coil. Again. Dealer now has to do more digging. This sucks. Almost to the point of trading for a JT.
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Old 10-05-2019, 10:44 PM   #20
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Or something with no J in it, at all.

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Old 10-06-2019, 02:52 AM   #21
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Sorry to hear of your situation. I faced similar troubles with my '07 when I purchased it. First day I had it, I took it up a pipeline clearing with some other jeep buddies. We went through a particularly nasty mud hole and everything seemed fine. Next day, I start getting codes piling up on top of each other left, right and center.


Long of it is after several mechanics scratching their heads, and more than a thousand spent in labor, I bit the bullet and took it to the stealership. They hummed and hawed for a few hours and said they'd need to run diagnostics and several more hours with it.
Rather than pay them 120/hour, I took it to a retired Jeep mechanic friend of mine. He came to the conclusion that water/mud had caused a small short in one of the O2 sensors, which in turn partially fried the PCM. It left no trace, and had many good mechanics stumped.


When I finally took it back to the Jeep dealership with this info, they agreed that it was a likely cause and ran a quick diagnostics on it, confirming that this was indeed the problem.


After driving for nearly three months with frequent misfires on all three passenger side cylinders, flashing CEL ALL.THE.TIME, and constant cut outs of power resulting from the misfires, my nightmare was over.


All in, I was set back nearly 4,500 and hundreds in time and fuel going from one garage to the next.


It was the single most frustrating experience that I've ever had with a vehicle in my life, but now that everything is back to functioning properly, and still going strong a year later (knock on wood,) I will say that I'm glad I stuck it out.


The most difficult part of that experience was where do you draw the line? If I don't fix everything, I'll take a massive loss on selling my problems to someone else. If I fix it, how many other issues will crop up in that process?


Damned if you do, damned if you don't.




I wish you the best of luck and sincerely hope that you can get your Jeep back on the road soon. Fingers crossed man!
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Old 10-12-2019, 11:43 AM
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Got a call last evening. Jeep is fixed. Supposedly. They had to make a bypass harness for cylinder 5. And they've done some test drives. I'm out of town so can't pick up the jeep for several more days. Then some more test drives before heading back to Silverton to pick up my trailer. No word on the $ damage yet.
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Old 10-12-2019, 11:50 AM   #23
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Bypass harness? This does not make sense. Would you be able to check again what they have done?
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Old 10-12-2019, 08:14 PM
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I think they ment that they bypassed the factory wiring to cylinder 5. I'll check more when I pick it up.
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Old 10-12-2019, 08:46 PM   #25
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Quote:
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I think they ment that they bypassed the factory wiring to cylinder 5. I'll check more when I pick it up.
wonder if you have rodent damage somewhere in the wire harness that was causing the short.
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Old 10-19-2019, 01:43 AM
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Picked up the Jeep this evening. Drove it home and had not died. A big improvement over last time. The dealer installed a bypass harness for cylinder 5. Also got one of the blown up ignition coils. Will try to get a photo of the harness tomorrow. And a shot of the coil.
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Old 10-19-2019, 09:28 AM   #27
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What motor? What year? Helps a lot when you post this info in the original post.
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Old 10-19-2019, 10:42 AM
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2012 JKUR. 3.6l. 102200 miles. While driving on CR2 in Silverton, that's the road from Silverton to Anamis Forks, had just turned around. Check engine light came on then about 200 ft further, the jeep just stopped. Would crank but not run. Local shop could not fix and the dealer in Durango could not get to it for over a week. So had towed to Albuquerque, where I live. The fixed it in a few days and on the drive home, just by my house, the exact same thing happened. Had towed back. They fixed it again and on one of their test drives, did it again. Something wrong with the wires to cylinder 5. Kept plowing up the coil. From the initial problem also, supposedly, the TIpM had a bad relay so that was replaced. Because of the harness issue, the built a bypass harness fir cylinder 5, so whatever was shorting out and blowing coils was bypassed. So far seems to work. Photos to follow.
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Old 10-19-2019, 11:41 AM   #29
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Very odd, has any work been done or electrical devices added? Mines the same year and almost exact miles lol i have about 400 more than your jeep. If you need any pics or anything to verify stuff let me know. Definitely interested in seeing the bypass pics.
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Old 10-19-2019, 11:46 AM
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No work and no electrical devices added recently. Those that are there, lights, winch, air compressor all run through an sPod and or have separate fuses.

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