Who has an extra PCM for a 93?

[MMiller]

I'm having A/C problems and can't make it work without jumping the relay terminals on the A/C(WOT) relay. I also noticed that the alternator is not charging. I've pulled the alternator to take to a test bench tomorrow. I've also cleaned and inspected the connector on the PCM. I'm betting the PCM took a permanent vacation.



My eyes are bleeding from looking at the schematic in my FSM, and old posts on A/C. I've checked, bypassed, and replaced everything possible in the A/C system, and no compressor clutch power, without jumping the relay. What have I missed???



Michael

 

[PToombs]

Did you check the wire and connection for the crank sensor? That controls charging, and I bet the A/C compressor won't kick on until the PCM sees RPM.

A-OK? C-U!

 

[MMiller]

Nope, sure didn't Pete. I guess when I get the new tensioner, and have the alternator tested, I'll put it all back together with a new belt and clutch, then I'll try and check for signal... ... ...



Thanks,

Michael

 

[PToombs]

That's what I'm here for!



Oh, and to get abused!

 

[MMiller]

Well, I took the alternator into the parts store machine shop, and asked the guy to test it. He looked at it and said "It will work just fine. I've tested hundereds of this style alternator and haven't found a bad one yet. " He was right, it worked fine. I brought it home tonight, put it back on the truck and strung the belt. I then started looking at the crank sensor and it was unhooked and the plastic sheething was chewed up!!#@$%! I hooked it back up, straightened it out, and started the truck. Everything works fine. So I removed the batteries, re installed the PCM, then the batteries, then all the a/c wiring I dug through. I started putting the dash back together and it got dark. I'll finish it tomorrow a. m. before embarking on a 4 hr trip in my 93. Oo.



Thanks Pete. I probably wouldn't have figured out that the crank sensor needed hooked up to make the a/c work.



Note to self: Kick the pet coon extra hard next time I see him. And no, it has 4 legs, and its not my pet. My wife's heart it too soft for furry little animals.



Michael

 

[Shadrach]

See Rebel Ram's comment about extra parts in the Conversion section under title about 727 trans. Shadrach

 

[PToombs]

Here kitty kitty kitty! POP! :-laf

 

[Dieselman359]

My kinda fix

Just the story that I like to hear, truck broke, look for fix, get ready to spend, find whats wrong (most of the time, nothing was wrong), fix (not as expensive as figured), get all ****** off about the whole thing.



I just did this tryin' to chase down some of the underbody oiler issues. New crank seal and cover gasket (lookin' over some recipts, those sure went up in price the last 4-5 years), no fewer leaks. Back to putting off that rear main, or pan gasket. :-laf

 

[bgilbert]

Good deal, now I won't have to send you my pcm for troubleshootingOo. . Hmm, belt breaks off, gets chewed up. . crank sensor and wiring in such close proximity, nah it only controls the optional tachometer right?:-laf

 

[PToombs]

I bet he's willing to send you a striped kitty! :-laf

 

[MMiller]

Good deal, now I won't have to send you my pcm for troubleshootingOo. . Hmm, belt breaks off, gets chewed up. . crank sensor and wiring in such close proximity, nah it only controls the optional tachometer right?:-laf

Nah Bill, the belt had nothing to do with it, I'm blaming it on the "pet" raccoon that the wife "saved" a few months ago. I caught him sleeping on the valve covers the day the a/c quit working.



I did make it home last night without mass carnage.



Michael

 

[PToombs]

Good deal! There is a guy on CF that has the same problems, so I advised him the same as you. Turns out his wire is gone from the plug down. I asked him if he lived in Fairfield. :-laf

 

[dpuckett]

Michael- I'd make my wife fix what the racoon possibly chewed up or did otherwise to. She wouldnt think so highly of the little cute thing after sweating all day working under the hood, trying to fix the truck. (Actually, MY girlfriend would have raced me to the gun cabinet to get something to shoot it with, figuratively, as I cannot legally posses a firearm just yet).



Glad to hear it was something simple. Like I keep telling you people- START SIMPLE and work your way up.



Daniel

 

[PToombs]

I'm simple! I mean, I like simple! I mean,... ... ... I forgot!

 

[MMiller]

The truck was lucky. The coon just chewed on the plastic conduit a little and unplugged the harness from the sensor. Put it back right, and everything worked. The coon has been caged, and transported to a very far away timber and turned loose with a little bowl of dogfood. The wife was tired of his antics of antagonizing the dogs, house guests, and all the potted plants. I suppose the coon is coyote bait by now.



Now, if I had only known that the sensor told the PCM what to do in the beginning, I would not have had such a hard time. I started with a malfunctioning a/c system and troubleshot it as such. Then I found the problem with the alternator, leading me to believe it was the PCM. Live and learn. Sometimes electrical problems can be fixed in 10 minutes and sometimes they are fixed in 10 days. This one was closer to 10 minutes, but not close as it should have been.



Michael