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6.5L Turbo Diesel - Tech Support - Troubleshooting - Performance 1992-00 6.5L Turbo Diesel - Welcome to the Internet's first discussion forum for the 6.5L diesel engine. Tips on performance, upgrades, cooling, fuel economy, troubleshooting and more.

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  #21  
Old 11-08-2019, 08:32 PM
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Quote:
Originally Posted by Bigrig594 View Post
....I'm working with a paperclip and Google after all lol.
There was a time, not long ago, we had only the paper clip. Then, along came The Diesel Page....
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  #22  
Old 11-09-2019, 07:00 AM
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Originally Posted by Bigrig594 View Post
The numbers matched up for the one the parts house looked up. So, I'm assuming it was the right tcm, I may have just looked up the wrong code chart or something. I'm working with a paperclip and Google after all lol.
The controller chassis part number can be the same for several models and years. However, the programming is different. Did you swap the EPROM from the old controller to the new?

Again, if you are getting engine related codes with your paper clip scanner, you have the wrong program or EPROM.
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  #23  
Old 11-10-2019, 08:24 AM
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Yes, I swapped the eprom from the old controller. I'm no longer getting engine codes, just trans codes.

They're all for the internals of the trans from what I could tell. I should have the new one in after this afternoon. So I'll know for sure if it was a build issue.
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  #24  
Old 11-10-2019, 10:46 AM
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The 4L80E is not a one tranny fits all.

There are subtle differences that cause issues.
A sensor that was not replaced could cause issues, as can the pressure regulator.

How old is the TPS on the Injection pump.

A flakey TPS can drive ya nuts and mess up throttle pressure and shift points...

If the TPS is not new REPLACE IT WITH AN AC DELCO
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  #25  
Old 11-10-2019, 01:08 PM
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I replaced it with the in and output shaft speed sensors
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  #26  
Old 11-10-2019, 01:18 PM
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What about the TPS on the IP ????
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  #27  
Old 11-10-2019, 01:26 PM
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The one I replaced was on the intake... didn't know there was one on my ip
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  #28  
Old 11-10-2019, 05:23 PM
Bigrig594 Bigrig594 is offline
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Sorry it was the ip not the intake.
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  #29  
Old 11-11-2019, 06:35 AM
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The TPS fastens to the passenger side of the Injector pump and is coupled to the throttle shaft.
There is a small wire plug that plugs into the TPS.

A faulty TPS will/can cause many issues
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  #30  
Old 11-11-2019, 06:57 PM
Bigrig594 Bigrig594 is offline
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Ok, got the new trans in. Still popping through 1st and 2nd gear. Parking brake light comes on now, cruise control no longer works, but I do have all gears now.

Pulled codes 85 trans gear error and 87 transmission gear ratio error.

New parts include input shaft and output shaft speed sensors, tcm, tps, and brake switch.
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  #31  
Old 11-13-2019, 04:44 PM
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What is the tps supposed to be set at?
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  #32  
Old 12-01-2019, 08:17 PM
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Ok, I have officially replaced every sensor, still having the same issue
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  #33  
Old 12-01-2019, 10:48 PM
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My 93 had a similar problem. Turned out to be the ign. switch. Burnt corroded contacts. Not that hard to remove and disassemble and look at. Or you could backprobe the TCM connector C277 at pins C16, wire no. 439, pink/black for battery voltage through the ign. sw. The 2 grounds at that connector are C1, wire no. 450, tan/white and C2, wire no. 551, black/white. At the trans. connector, you should have battery voltage through ign. switch at pin C and pin K. Do_not_remove the connectors and check the voltages/grounds with them disconnected as the circuit will not be loaded and you'll get incorrect readings. I'll try to attach scans of the two connectors from the wiring diagram from my alldatadiy info. Good luck.
Attached Images
File Type: jpg 93 wir. dia., TCM connector.jpg (67.7 KB, 4 views)
File Type: jpg 93 wir. dia. Trans.connector.jpg (33.7 KB, 1 views)
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  #34  
Old 12-02-2019, 06:50 PM
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Quote:
Originally Posted by 56pan View Post
My 93 had a similar problem. Turned out to be the ign. switch.
Refer to post #3. Have you verified the trans and TCM have good power?
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