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Unread 09-05-2013, 03:08 PM   #31
flash2225
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1993 ZJ 
 
Join Date: Jul 2013
Location: tumwater, wa
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With all of those codes coming up that have something to do with voltage, getting that alternator reading im sure will go a long way to figuring it out. Every time i get some spare time to work on it, i get rained on. Days i have to work all day its been sunny, go figure =)

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Unread 09-05-2013, 05:02 PM   #32
Rich93ZJ
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If it were mine I would say a bad alternator and a vacuum leak at or around the throttle body. I would have the battery load tested and make 100% sure your battery connections are clean and tight.
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Unread 09-05-2013, 05:22 PM   #33
flash2225
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Got home, rain an thunder going on. But, I got it to start And just got it to hold an idle by holding up the PCM wires. Going to try that again here when it stops raining, and get that alternator reading
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Unread 09-05-2013, 06:37 PM   #34
flash2225
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Yep, looking like its the PCM wires that is the cause of my problems. I had checked them before, well actually had my brother check them while i was in the cab. Apparently he wasnt holding the right wires. Soooooo Saturday project (looks like it will be sunny) is to do the zip ties!
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Unread 09-06-2013, 11:04 AM   #35
flash2225
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I noticed on the 12 things you can do post http://www.jeepforum.com/forum/f13/1...talls-1407423/

That you can clean, regrease and zip tie the wires back to PCM. Is this only for the later models, or is it something i can apply to the 93 Zj? If it does not apply would that mean i would need to do the capacitor fix in this thread? http://www.jeepforum.com/forum/f13/f...riteup-501951/
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Unread 09-07-2013, 08:31 PM   #36
flash2225
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Well the alternator reading was 13.9 to 14.2.

Took apart the PCM/ECM (not sure which is correct), and it was pretty dirty inside. So used contact cleaner and cleaned it out real good and pretty like. Synched up the cords with some zip ties, and it seems to work.
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Unread 09-08-2013, 10:34 AM   #37
ZeeJay1997
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Quote:
Originally Posted by flash2225 View Post
I noticed on the 12 things you can do post http://www.jeepforum.com/forum/f13/1...talls-1407423/

That you can clean, regrease and zip tie the wires back to PCM. Is this only for the later models, or is it something i can apply to the 93 Zj? If it does not apply would that mean i would need to do the capacitor fix in this thread? http://www.jeepforum.com/forum/f13/f...riteup-501951/
I recommend the zip tie fix to be used as a troubleshooting step on the later model ZJs. The earlier OBD1 ECUs have a different type connector and arent prone to solder joint failures, though it's not impossible. My take-away from reading here on the forum, these connectors are more prone to having pins pushed back, which can mimic the loose solder joint problem on the OBD2 vehicles.

In your case, if there is a failure at the ECU, it will most likely be a pushed back or loose socket in the connector. Cap failures on the OBD1 ECUs generally will not cause a code. It never hurts to replace the caps though.


Quote:
Originally Posted by flash2225 View Post
Thanks Zeejay!
You're welcome. Thanks for saying thanks. Not many people do.
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Unread 09-08-2013, 12:50 PM   #38
flash2225
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Well the saga is ongoing. Ran it for 15 miles and some new symptoms. High idle and voltage drops, this time with code 44, which is ECM code. Looking like a new ECM. Time for more testing.
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Unread 09-08-2013, 02:00 PM   #39
ZeeJay1997
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high idle is sometimes cause by vacuum leaks. do the voltage drops correspond with the idle speed?
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Unread 09-08-2013, 02:04 PM   #40
ZeeJay1997
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also, i dont have the book on the 93 but for a 95 code 44 is:

An open or shorted condition exists in the engine coolant temperature sensor circuit or a problem exists in the PCM's battery temperature voltage circuit.

the battery temp problem would correlate to your voltage surges.
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Unread 09-08-2013, 02:22 PM   #41
flash2225
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Interesting, I must have read the wrong obd code. The jeep is at my friends right now, couldn't drive it home. So, I'll double check the code. The rpms at idle is constant at 2k. Drops down when in drive, no real surges. But I do think that as the volt dropped the idle did as well now that I think about it
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Unread 09-08-2013, 02:29 PM   #42
flash2225
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Also, I can still jiggle the PCM harness to get it to keep idle, but as soon as I release it dies. I did a vacuum leak test, and couldn't find any.
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Unread 09-08-2013, 02:48 PM   #43
ZeeJay1997
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have you taken the ECU connector off and checked its sockets? the wiggling is a dead giveaway.

also, with the various codes you have had throughout your ordeal, i would suspect the common ground for the sensors you have mentioned.

I'm not a v8 person, nor an OBD1 person, but i recollect that the engine sensors are grounded somewhere on the block, unlike the OBD2 models where the PCM furnishes a ground.
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Unread 09-08-2013, 03:16 PM   #44
flash2225
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Yes I took off the connector yesterday, used contact cleaner in there, let it dry and then reassembled. Is the battery temp sensor something I should get from the dealer, or is that one ok to pickup at napa or autozone?
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Unread 09-08-2013, 05:55 PM   #45
flash2225
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Theoretically, if there was dirt still lodged in the female end, could that be the issue? I didn't pay as much attention to the female end as the male end. If theoretically that could be the issue, making it not seat correctly, I'll go back in and try to clean that more. Heck of a lot cheaper than a new ECM.
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