4r TCC partial lockup malfunction? - TCCoA Forums
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post #1 of 5 (permalink) Old 01-01-2015, 07:49 PM Thread Starter
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Smile 4r TCC partial lockup malfunction?

Running a 4r with baumann controller.

I use a floor switch to manually lock converter and have an LED light to indicate when the converter is locked.

Lately, I have noticed, when unlocked, I have a small amount of light on the LED intermittently (not fully lit as is typical with lockup). This leads me to believe the TCC is receiving some sort of uncommanded ground signal or there is something wrong with the TCC solenoid or the Baumann controller. I have eliminated my switch as a potential culprit.

The real problem here is I have experienced stalling when going from P to R or D. This problem is intermittent but annoying. I have to give it about 1500rom to keep it from stalling.


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post #2 of 5 (permalink) Old 01-01-2015, 07:58 PM
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It's hydraulically impossible to lock the converter in 1st gear on the 4R70W, so I doubt it's the cause of your stall when shifting out of park.

The TCC solenoid is PWM controlled IIRC, at least on the Ford PCMs. Do you have a way to check the duty cycle for that circuit?

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post #3 of 5 (permalink) Old 01-01-2015, 11:57 PM
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that kind of stalling usually stems from a large vacuum leak that is letting in so much unmetered air that the engine stalls before the PCM has any time to adapt the fueling and record corrections.
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post #4 of 5 (permalink) Old 01-02-2015, 12:19 AM Thread Starter
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Actually I am working a vac issue too. Just thought the strange lockup indication was too much of a coincidence. Let me button up this vac issue and I will report back if it doesn't work.

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post #5 of 5 (permalink) Old 01-02-2015, 11:13 AM
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You might need to change the fluid or wash down the wiring; an LED doesn't need a lot of current to be visible, less than 1 milli-amp, so you could get leakage in the wiring somewhere.

Salt in the external wiring could do this; the solenoid needs a bunch of current to work, so a dim light is unlikely to be enough to move it.

I can confirm the 1st gear/no-TCC interlock; My black Cougar has been having problems disengaging, and I finally figured out my TCC solenoid is stuck closed, lol.

It's drivable, but rough.

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