How does dual switch brake pedal work ?

[Mogman]

Dear Mogman, first I really appreciate your help. I have just disconnected both batteries entirely. Went to the TCU - jump-wired (A) and (E). Reconnected the batteries. Flipped the ignition switch to check the transmission codes.....

Again nothing. I'll attach a video, unless I'm missinterpreting it.....

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.

 

[Mastherr]

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.

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?

 

[Mogman]

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?

Sorry!

 

[Mogman]

Does the trans light come on when switched to run and then go off when started?

 

[TOBASH]

Dear Mogman, first I really appreciate your help. I have just disconnected both batteries entirely. Went to the TCU - jump-wired (A) and (E). Reconnected the batteries. Flipped the ignition switch to check the transmission codes.....

Again nothing. I'll attach a video, unless I'm missinterpreting it.....

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.

 

[Mogman]

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.

If you disconnect the batteries the codes will be erased.

 

[Mastherr]

Does the trans light come on when switched to run and then go off when started?

Yes, it does, as it should.,

 

[Mastherr]

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.

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

 

[Mogman]

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

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

 

[Mastherr]

Ok, will disconnect temp control next time.
Question: should I drive around in limp mode so new codes are stored again for future reading? Any idea for how long should I drive for the system to eventually record faulty codes again?

 

[Mogman]

Ok, will disconnect temp control next time.
Question: should I drive around in limp mode so new codes are stored again for future reading? Any idea for how long should I drive for the system to eventually record faulty codes again?

It should not take long, IIRC it would shift one time, if so I predict you should see a code 87

 

[Mastherr]

Will do and keep you posted. Tks guys!