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Discussion Starter #1
I'm not a truck forum guy so I figure someone here knows this.

Have a 2007 F150 throwing codes that blame a TSS (or input/turbine shaft speed sensor). I checked the connection and wiring --OK. So, I got a new sensor this afternoon to put in. But, I still have a question. Other than the code and having the thing nose over and go into a sort of limp mode with O/D flashing, engine code light on, etc., what is happening? I understand that the input speed sensor and output speed sensor tell the ECM if there is slippage in the converter. But what does the ECM do in response?

Under mild/medium accelleration it revs and falls, revs and falls, as though I'm goosing the throttle. Is that because the input shaft sensor is faulty and the ECM thinks the converter is slipping so it cuts fuel to reduce the perceived "slippage"? Thanks.
 

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Discussion Starter #2
I guess I don't feel so bad for not knowing. Anyone have an idea? If not, I guess I'll let it go.
 
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