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Username Post: Computer Memory        (Topic#351114)
go_hercules 
Poster
Posts: 74

Reg: 10-27-16
05-14-18 08:43 PM - Post#2733996    

1990 C1500

I am going to change my blower motor out in a couple of days. I will need to disconnect and remove the computer for access. I have never disconnected the computer on this truck so I had a couple of questions before diving in.

(1) does disconnecting the computer mean that everything will have to be "relearned" after hooking it back up (throttle position sensor for example) or does it store this information for some period of time?

(2) I read somewhere that if the computer is left disconnected for too long, it would have to be "reflashed" whatever that means. How long is safe to leave it disconnected? If I get the thing apart and have the wrong blower or whatever, it could be down for a few days or more.

(3) When I'm done and reconnect it, is there anything special I have to do, like any sort of reboot or what-not?

Thanks very much.



 
junkman104 
Frequent Contributor
Posts: 1184
junkman104
Age: 59
Loc: Murphy N.C.
Reg: 01-25-14
05-15-18 03:52 AM - Post#2734003    
    In response to go_hercules

Its been a long time since I replaced the blower motor on one of those but im sure I never took the ecm out to do it. I do recall taking the bolt out of the bottom of the dash to make it easier to remove it.



 
CowboyTrukr 
"7th Year" Silver Supporting Member
Posts: 3926
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
05-15-18 05:56 AM - Post#2734009    
    In response to junkman104

The computer will be fine. You really don’t have to disconnect it.

It is installed on a tray. There are two sockets on the right side of the tray that receive two pins that are attached to the ECM box. The left side is held in place with two spring clips.

Slide it to the left to release it from the tray and then You can maneuver it a bit to spin it and have it sit out if the way so you can see to remove the screw(s). 7mm

The computer and PROM never lose their memory. The only thing lost is any trouble codes that may have been set.

There are no special reflash requirements.


Greg

'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500
'00 Explorer XLT 4.0 V6 Auto
'94 K2500 5.7 NV4500 ECLB - SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
go_hercules 
Poster
Posts: 74

Reg: 10-27-16
05-15-18 09:19 AM - Post#2734029    
    In response to CowboyTrukr

If I am able to set the computer aside, do you think I will have to remove the tray it sits on to get the blower rubber cover off? I watched a video and the guy took the computer and tray completely out.



 
rockfangd 
"5th Year" Gold Supporting Member
Posts: 2368
rockfangd
Age: 32
Loc: Utica ny
Reg: 04-13-10
05-15-18 07:09 PM - Post#2734061    
    In response to go_hercules

I just did mine recently.
To be done properly I had to remove my ecm.
Same year as yours.
Let me see if I can find it.
was recently.
Read my topic BLOWER MOTOR REPLACEMENT.
I bumped it up so you will easily see it.
I hope it helps you

Old School GM fan FOREVER


Edited by rockfangd on 05-15-18 07:12 PM. Reason for edit: No reason given.

 
go_hercules 
Poster
Posts: 74

Reg: 10-27-16
05-15-18 07:38 PM - Post#2734063    
    In response to rockfangd

Thanks a lot for that. I had not seen that thread. Your last post in that thread said pictures coming????



 
rockfangd 
"5th Year" Gold Supporting Member
Posts: 2368
rockfangd
Age: 32
Loc: Utica ny
Reg: 04-13-10
05-15-18 09:03 PM - Post#2734074    
    In response to go_hercules

Yes.
I have a very hectic working schedule so time is not something I have much of.
If I get home early enough tomorrow night I will try to post a pic or 2

Old School GM fan FOREVER


 
go_hercules 
Poster
Posts: 74

Reg: 10-27-16
05-16-18 03:00 PM - Post#2734118    
    In response to rockfangd

Well I tackled this job today and it wasn't too terribly bad. Without the instructions from Rockfangd, it would have been much, much worse. The tip about prying the pivot bracket out and back was the lifesaver. That did the trick. It did take quite a bit of force to pry that bracket out, more than I was expecting. And like you guys said, the computer worked fine after plugging it back in. Thanks.



 
rockfangd 
"5th Year" Gold Supporting Member
Posts: 2368
rockfangd
Age: 32
Loc: Utica ny
Reg: 04-13-10
05-16-18 06:25 PM - Post#2734138    
    In response to go_hercules

Great to hear. I have done enough of these, dont like to take shortcuts,
But if I was confident in doing it on mine I would recommend it.

Old School GM fan FOREVER


 
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