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TCM relocation

Friday, May 30, 2014 - 07:00
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Sometimes you hear of a freely traveled road or bridge suddenly becoming toll access only. The promise is that once they raise enough money for a certain project, the toll will go away. I have yet to see that promise fulfilled.

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When I see a transmission control module (TCM) inside the transmission, I think to myself, it sure would be nice if they would relocate it externally. But I don’t hold my breath. 

But to my surprise, I could have held my breath with this new feature with Ford, as the automaker relocated it. Beginning at the start of production for the 2010 model year on Ford trucks with the 6.2L engine, the Transmission Control Module/Mechatronic unit was removed from the top of the valve body and is now combined with the Engine Control Module in the newly revised Powertrain Control Module. This change then carried on to 2011 model cars and trucks equipped with 3.7, 5.0 and 6.2 L engines. However, 4.6 and 5.4L vehicles still have an internal TCM.

Figure 1 (left) provides terminal identification for the new pass through transmission connector, which can be used for external diagnostics. Figure 2 (right) provides solenoid resistance checks.

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