Vanning.com logo
Boxdin
Site Navigation


Advertisements
Recent Posts
Chevy G20 Dash Gauges don't move?
by AbbyG20. March 23rd 2019 6:39 am
My vans
by AbbyG20. March 23rd 2019 6:27 am
New van dude
by AbbyG20. March 23rd 2019 6:24 am
What is your gas prices?
by frscke1. March 23rd 2019 2:48 am
Lister's 93 G20 Explorer
by frscke1. March 22nd 2019 9:14 pm
Roll Call. I’m here and new
by frscke1. March 22nd 2019 9:11 pm
New guy...
by Starlord. March 22nd 2019 8:17 pm
New guy🔥🔥🔥
by lukester. March 22nd 2019 8:14 pm
What Did You do To your Van Today?
by JAGI410. March 22nd 2019 7:21 pm
really want to lower my 96 van
by textual. March 22nd 2019 5:04 pm
Featured Links
Vanning.Com is a an authorized Amsoil Dealer


Previous Thread
Next Thread
Print Thread
Rate Thread
1995 g20 transmission control? #745580
February 23rd 2019 9:22 am
February 23rd 2019 9:22 am
Joined: Aug 2018
Posts: 83
Pennsylvania
D
Dw89xj Offline OP
journeyman
Dw89xj  Offline OP
journeyman
D
Joined: Aug 2018
Posts: 83
Pennsylvania
Are there any gurus in the group that can answer z couple questions? My vans transmission is in limp mode, it is an OBD1 style diagnostic plug. I bought an adapter and scanner with no luck and tried the paper clip jumper trick to try and get any codes, also with no luck. A refurbished -7427 pcm from acdelco is about 250 bucks, I can get one quite a bit cheaper but then would need to have prom/calpak transferred, before I spend this money can anyone tell me-
>Is the transmission control for the 4l60e in the pcm on this van or...
> is the transmission control separate and hidden somewhere else?
My van has pcm in the wall behind the driver seat, it's a conversion van. My speedo works fine, van runs pretty good considering the iac needs cleaned and it could use a tune-up in general. It's just the transmission is in limp mode, sometimes the CEL goes away and it shifts fine.
I was told that the pcm on this van controls the transmission and that it is known to have a ground that breaks and can cause this intermittent issue. It's mostly in limp mode now, occasionally it will act fine. Any help would be appreciated, my harness looks fine, plugs and connections look good. Speedo works. Since I cannot get codes and my transmission is in limp this tells me I'm losing power or ground somewhere, possibly the pcm issue I was told about? Again any help would be greatly appreciated. Again it's a 95 and has 4l60e and 5.7 tbi. Thank you guys.

Last edited by Dw89xj; February 23rd 2019 9:30 am.

98 Dodge shorty hitop mark iv
95 Chevy van 20 regency hitop conversion van
Re: 1995 g20 transmission control? [Re: Dw89xj] #745582
February 23rd 2019 10:03 am
February 23rd 2019 10:03 am
Joined: Sep 2005
Posts: 8,680
Georgia, USA
CatFish Offline
carpal tunnel
CatFish  Offline
carpal tunnel
Joined: Sep 2005
Posts: 8,680
Georgia, USA
I don't know very much but I'll share what I know.
Yes the PCM controls the shift solenoids. You should have two cables from the PCM. Red and Blue. The blue side has the trans pin-outs.
You said no codes? Mmmm.
Well, some things that cost very little and are easy to check.
Check your grounds. (of course) Both engine to frame and near the PCM.
Carefully remove, inspect and clean the transmission control cable and connector at the transmission. It's possible for that to get water,dirt inside.
Make sure the cable connections are clean and haven't corroded.

Pin-outs to check/trace your PCM grounds and the sensors grounds are here:
https://troubleshootmyvehicle.com/gm/4.3L-5.0L-5.7L/ecm-pin-out-chart-1

Hope this helps.



How come you never see a headline saying ‘Psychic Wins Lottery?


Re: 1995 g20 transmission control? [Re: CatFish] #745583
February 23rd 2019 10:13 am
February 23rd 2019 10:13 am
Joined: Aug 2018
Posts: 83
Pennsylvania
D
Dw89xj Offline OP
journeyman
Dw89xj  Offline OP
journeyman
D
Joined: Aug 2018
Posts: 83
Pennsylvania
Originally Posted by CatFish
I don't know very much but I'll share what I know.
Yes the PCM controls the shift solenoids. You should have two cables from the PCM. Red and Blue. The blue side has the trans pin-outs.
You said no codes? Mmmm.
Well, some things that cost very little and are easy to check.
Check your grounds. (of course) Both engine to frame and near the PCM.
Carefully remove, inspect and clean the transmission control cable and connector at the transmission. It's possible for that to get water,dirt inside.
Make sure the cable connections are clean and haven't corroded.

Pin-outs to check/trace your PCM grounds and the sensors grounds are here:
https://troubleshootmyvehicle.com/gm/4.3L-5.0L-5.7L/ecm-pin-out-chart-1

Hope this helps.

Thank you very much this will help alot. Yeah the no power at the diagnosis port and obvious no power to the transmission have me leaning to a ground or pcm issue.


98 Dodge shorty hitop mark iv
95 Chevy van 20 regency hitop conversion van

Moderated by  Astro 

Donate


Upcoming Events
discovery
Who's Online Now
0 registered members (), 0 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Newest Members
Easy, Hastaspoon, LaGator, Nobodyknowsme, SteveD
10811 Registered Users
Top Posters(30 Days)
frscke1 77
CatFish 76
Lister 32
Forum Statistics
Forums68
Topics35,496
Posts518,127
Members10,812
Most Online177
May 8th, 2013

Powered by UBB.threads™ PHP Forum Software 7.6.1.1