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1995 g20 transmission control? #745580
February 23rd 2019 9:22 am
February 23rd 2019 9:22 am
Joined: Aug 2018
Posts: 112
Pennsylvania
D
Dw89xj Offline OP
member
Dw89xj  Offline OP
member
D
Joined: Aug 2018
Posts: 112
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: 8,746
Georgia, USA
CatFish Offline
carpal tunnel
CatFish  Offline
carpal tunnel
Joined: Sep 2005
Posts: 8,746
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.


“A van may be safe in the garage, but that's not what vans are for.”

Re: 1995 g20 transmission control? [Re: CatFish] #745583
February 23rd 2019 10:13 am
February 23rd 2019 10:13 am
Joined: Aug 2018
Posts: 112
Pennsylvania
D
Dw89xj Offline OP
member
Dw89xj  Offline OP
member
D
Joined: Aug 2018
Posts: 112
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
Re: 1995 g20 transmission control? [Re: Dw89xj] #749737
June 17th 2019 12:48 pm
June 17th 2019 12:48 pm
Joined: May 2019
Posts: 47
Kennesaw
M
MXDUDE Offline
newbie
MXDUDE  Offline
newbie
M
Joined: May 2019
Posts: 47
Kennesaw
Have you figured out this issue? My van had similar issues and determined it was the TPS.


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