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If you disconnect the batteries you will erase the codes, you would need to drive it again enough to cause it to go into limp mode and then try again without disconnecting the batteries.
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- Thread starter HUMMER H1
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I thought it was an instruction to do so!!!!!
…so what’s next ? Drive around for while until the codes are recorded again if any?
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Sorry!
I thought it was an instruction to do so!!!!!
…so what’s next ? Drive around for while until the codes are recorded again if any?
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Does the trans light come on when switched to run and then go off when started?
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Perhaps I misunderstanding you, but you disconnected the batteries and then went to check transmission codes? There would be no power going to the transmission, therefore no codes. You need to disconnect the batteries and then reconnect the batteries and then disconnect the temperature control module and then remove the G2 cover, which is the accessory area and jumper A and E. Then watch the codes. It starts with a code 12, continues with the code 12, then you get a bunch of codes and then it ends with a code 12.
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If you disconnect the batteries the codes will be erased.
Yes, it does, as it should.,
Hi Tobash, thanks for jumping in. I've disconnected the batteries for about 5 minutes, reconnected them, and went to do the testing. Removed, the cap, jump wired (A) and (E), Ignition on (not engine running), and transmission light begin the testing. Only 3 times code 12, a "lenghty" time no code, and again 3 times code 12.......
I don't know about "disconnect the temperature control module ", never heard about this procedure. What is it?
In the picture attached, is this the temperature control module I have to disconnect prior doing the transmission code testing? If not, please help me identify it.
Many tks
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- 7,300
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- Papalote, TX
Any time you are doing electrical work where you are going from off to run repeatedly you should disconnect the TSU or you can burn up the glow plugs.
Any time the TSU is plugged in and you turn the run switch to off you MUST wait at least 90 second before going back to run.
All this is laid out in the transmission supplement and the -10 operators manual which should be mandatory reading for anyone before they touch a HMMWV
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It should not take long, IIRC it would shift one time, if so I predict you should see a code 87
Dear TOBASH, Mogman and Mullaney, after the misunderstanding, reconnected the batteries went for a 30 minutes spin around the block (during the spin I "forced" it, went to almost 3,500RPM, changed High/Low gears, etc....), parked, turned it off, unplugged the glow plugs TSU, jump wired "A" and "E", turned ignition on (not started) and recorded the transmission light codes. Nothing!!! only 12 12 12 12 12 12 12 ......
HMMWV remains in limp mode with no transmission error whatsoever! The only unusual thing it the break warning light ALWAYS on! ..
can you shed any light at this tunnel?
HMMWV remains in limp mode with no transmission error whatsoever! The only unusual thing it the break warning light ALWAYS on! ..
can you shed any light at this tunnel?
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If the trans light comes on when switched to run then goes out when you start the truck then I would suggest trying another TCM, it sees the truck running but does not know it has problems.
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you don’t get codes on a dead TCM…or in some cases,open the TCM encl and see if there is even a TCM inside.
Yes, the light comes on, goes off and the truck starts perfectly.
Before spending $600-700 on a new TCM, is there any testing (electronically speaking) I could do ?
Are there other cheaper sensors that might be worth replacing before the TCM itself?
(i.e. swapping TISS for TOSS …)
I’m sure I have a module inside! The testing procedure is working fine.
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have you checked the transmission relay to make sure 29T is plugged in?
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- Papalote, TX
If there was a problem with the sensors and the TCM was healthy enough to know you would get codes.
It would be interesting to disconnect the TISS, TOSS and TPS separately and see if you get any codes
…good idea, will do that. It will validate if the TCM is working on not! Tks