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According to the schematics I have 97A/B are the wires that used to go to the RPM sensor on the back of the engine to the diag. port. There would be no sensor like that on the turbo motor because there is no place to install it with the turbo, that sensor was only used for diag. and has no...

I don't know how to decipher the information on the TCM housing cover, and the TCM could have been changed at any time. If you had issues with any of the inputs like the ESS (engine speed sensor) you should have a code and also without that data it would not shift correctly if at all. The first...

This is what the original TCM looks like, it has a small cover that can be removed to get to the PROM.

No pics, does your truck have a tach?

I bought a HMMWV in July and still do not have my SF-97. So last week I had my attorney contact their legal dept and they responded with the same excuse they had when I contacted them after the 60 days were up. They said there was a mistake made with the serial number and they were going to have...

The PCS TCM says PCS on it and has a 2100xx part number.

Do you know if you have the old style TCM or the newer style PCS TCM?

It will flash 12 three times to show it is in diagnostic mode, then if there are no codes it will flash 12 a forth time and then stop, if there are codes it will flash each code three times after the first three 12s then when there are no more codes it will flash 12 one last time then stop. I...

Have you checked for codes? not all codes turn on the light

Welcome to the SS forums!! It appears this is a dead subject.

You can wire directly to a switch if it is heavy enough, but why not actually troubleshoot and fix the problem? Have you pulled the inst. panel and checked the switch and resistor for voltage?

That 12V does not come from the TCM, it comes from the trans relay. The transfer case lock light has nothing to do with the trans light, it is run by 24V from the inst. power

David, If you do not have 12V to the trans light connector it is not the TCM. Your truck is shifting so it is a little premature to be looking for a TCM

I would say if that checks out then the next step would be to substitute the TCM, the flashing of the trans light when running might be a TCM error

Also make sure the continuous 12V is applied to the TCM, there are two 12V feeds one is switched and one is continuous. That would be wire 537D and pin Z on the TCM connector. Do you have the trans supplement?

Is it possible you had disconnected the batteries or removed the harness connector from the TCM before reading the codes, this would erase the codes

Did you let the codes finish? It will flash 12 three times then give the codes, if there are no codes it will flash 12 four times then stop. EDIT, if there are codes it will flash 12 three times, then each code three times then after all the codes are flashed it will flash 12 one more time then...

The most common rule is any vehicle can be driven in any other state by a driver licensed and a resident of the state the vehicle is legally registered in (reciprocal agreements), a driver licensed and a resident of a state that is driving a "prohibited" vehicle registered in another state is...

Unplug the valve and see if the fan runs all the time, if so it is likely and electrical problem with the temp sensor, TDM or the wiring.

That valve making noise is rather normal, some folks go to great lengths to make it quiet including wrapping it in rubber which I would be afraid would make it overheat. it will be hot as the hydraulic fluid from the brake/steering system is constantly flowing through it, 180 deg or so would be...