94 gmc sierra..
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Teching In
Joined: Sep 2024
Posts: 4
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From: ILLINOIS
94 gmc sierra.. New to the forum. I have a freshly rebuilt 94 4l60e that after reseting the Ecm it goes back into limp mode. I have to reset the Ecm every day to drive it or if I don't use the truck for a few hours I have to reset the Ecm. Once I do this the transmission will shift just fine until it sets for an hour or so.. Any I sight would be greatly appreciated. The transmission besides new parts from the rebuilt it also has a new separator plate and a new internal wiring harness. Thanks for your help and for allowing me to join..
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Joined: Mar 2012
Posts: 858
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From: Texas
You need an OBD 1 code reader. I have an Innova 3140 that I've had nearly 20 years. It reads both OBD 1 and OBD II with 2 different cables one with matching plug for each system. Now this one is somewhat dated but there are similar more modern versions available. These scanners are an absolute necessity in my opinion if you own any computer controlled vehicle to give insight into the problems your vehicle is having.
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Joined: Mar 2023
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From: BERWICK PA
Also call round known older garages .Many still have their old snap on scanners laying around and can scan it. Also you can check on a cable USB to ALDL cable and several programs online that can read codes and some data that way. But as mentioned if you have an older vehicle you plan on working on and keeping the ability to scan it is imperative.
But without some method to read codes or data even better , You are chasing your tail throwing parts at it .
But without some method to read codes or data even better , You are chasing your tail throwing parts at it .
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Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
Thread Starter
Teching In
Joined: Sep 2024
Posts: 4
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From: ILLINOIS
Update. I did the paper clip and got code 66. This states that there is an open circut in the 3-2 shift solenoid the only problem with that is I don't have a 3-2 shift solenoid. I have a 1-2 & 3-4 ( A & B ) . I still have the original solenoids that were taken out when the transmission was rebuilt. I checked them for resistance and according to Google they should have between 12- 28 ohms,. Both of my old ones have between 20-21 ohms. And when they are supplied with power they click open and closed. I'm thinking of putting them back in the transmission to see what happens.
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TECH Junkie
Joined: May 2012
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From: Poplarville, MS
I did the paper clip and got code 66. This states that there is an open circut in the 3-2 shift solenoid the only problem with that is I don't have a 3-2 shift solenoid. I have a 1-2 & 3-4 ( A & B ) . I still have the original solenoids that were taken out when the transmission was rebuilt. I checked them for resistance and according to Google they should have between 12- 28 ohms,. Both of my old ones have between 20-21 ohms. And when they are supplied with power they click open and closed. I'm thinking of putting them back in the transmission to see what happens.
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Verdad Gallardo Thread Starter
Teching In
Joined: Sep 2024
Posts: 4
Likes: 1
From: ILLINOIS
94' gmc sierra New to the forum. I have a freshly rebuilt 94 4l60e that after reseting the Ecm it goes back into limp mode. I have to reset the Ecm every day to drive it or if I don't use the truck for a few hours I have to reset the Ecm. Once I do this the transmission will shift just fine until it sets for an hour or so.. Any I sight would be greatly appreciated. The transmission besides new parts from the rebuilt it also has a new separator plate and a new internal wiring harness. Thanks for your help and for allowing me to join..
Update: I changed the 3-2 shift solenoid and she is shifting great. No issues. Thanks everyone for the help on solving this issue. THANK YOU....