Recent content by twisted60

Good day, Couple questions: First question : I’m trying to understand the Engine Speed Sensor, looking at the trouble shooting guide in ™ …387-24-1 section 2 pg 402 it says .3 volts min at idle but it doesn’t say a/c or d/c. I see it marked as a/c in the 4L80 supplement,,, so should I read A/C...

Thanks, yes I have that manual. Trans light comes on when run switch is turned on and goes out when engine starts. I’ll check for codes to be sure. Thanks Sent from my iPhone using Tapatalk

Yes trans light works. What should I check to see if TC is working correctly ? I’ll go back in manuals and try to find an answer. Thanks Sent from my iPhone using Tapatalk

What should be normal operating temperature of a 4l80e transmission ? I went for a 10-15 min drive and crawled under Humvee after and transmission pan was very hot, I’ll try again tomorrow and get some temperature numbers with my temp gun. Thanks Sent from my iPhone using Tapatalk

Thanks, I’ve found 2 compatible GM TCM’s used and ordered the blue chips so I’ll find out, hate to pay $650 up for a spare. I’m really just trying to learn more and investing $200 is worth it to me. Thanks everyone. Rick Sent from my iPhone using Tapatalk

Yes the new TCM’s are pricy $650 up. I’m going to try getting an old civi TCM with an eprom to just try ($250 +/-) if it works I’ll keep for a spare, if not … well I learned something Thanks Sent from my iPhone using Tapatalk

Thank you that helps me understand them better, I was confused by the dates on the chips. So a 1999 turbo chip is good for 2006 turbo but not for a 2006 non turbo and the newer TCM’s don’t have chips. Again thanks Sent from my iPhone using Tapatalk

Are all the eprom’s compatible in the TCM’s ? I see different years I assume different programming for shift points as trucks got heavier ? I’m just trying to learn more about the different Humvee’s. Thanks Sent from my iPhone using Tapatalk

Thank you

I’m trying to check DTC codes on my 2005 M1152 and it just respetes 12, I let it run thru 7 times and just respetes 12, is it safe to assume there are no problems with TCM ? I dont see anything in 4L80 manual or ™’s addressing this. Thanks Rick

Page 12 of the supplement talks about voltages and it says approximately 0.5 volts closed … signal voltage increases to greater than 4.5 volts at wide open throttle. Thanks for the help, I have another TCM here same year as mine I can pop in tomorrow and see. Sent from my iPhone using Tapatalk

1 of the first things I tried was hitting all connectors with contact cleaner, they all looked bright and shiny. Just got back from test run after adjusting TPS, I set it at .502vdc. It started out good but went into limp mode after warming up. I tested TPS again when I got home with everything...

Was able to pull codes today (used different jumper) . New code pooped up, 87, Did some testing on TPS, I think retired warhorse mentioned to check. With glow plug controller disconnected I got: 0.7vdc (no pedal) - 4.49vdc (pedal to the floor) from wire 355B 5.02vdc from wire 350C Manual says...

Codes were 38, 85 & 86. 38 torque converter clutch 85 undefined ratio error 86 low ratio error I’ve changed the TISS and TOSS no change. When everything is cold transmission runs normal RPM to MPH. After it heats up it goes into limp mode 2nd gear only. When hot it won’t move if I shift into...

Yes, truck level, warmed up and ran thru gears. Sent from my iPhone using Tapatalk