DISA resurrection?

Oldmactech · #1 10-06-2021, 01:51 PM

My DISA shoes not active on my scanner.

Gets 12 volts at key position two but the flap doesn’t move with 12v to it.

I have already replaced the flap and such but the actuator seems to have failed. Any chance to fix that?

Thanks.

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Corellian Corvette · #2 10-06-2021, 01:55 PM

I'm not aware of any fix to the electrical side.

I would try and source a good used unit vs. a new aftermarket one. I haven't had great luck on aftermarket ones.

Oldmactech · #3 10-06-2021, 02:01 PM

Thanks, kinda figured that.

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Clavurion · #4 10-06-2021, 03:10 PM

You need vacuum to operate it. It's electric vacuum solenoid, not a servo drive.

andrewwynn · #5 10-06-2021, 03:16 PM

I always suck on the DISA tube to make sure the valve moves before installing.

Corellian Corvette · #6 10-06-2021, 04:33 PM

I've always been curious about this. Is it Vacuum that holds the valves shut and that sends an electrical signal? Or is there a servo in there that allows the flap to move?

Clavurion · #7 10-06-2021, 04:48 PM

Quote:

Originally Posted by Corellian Corvette

I've always been curious about this. Is it Vacuum that holds the valves shut and that sends an electrical signal? Or is there a servo in there that allows the flap to move?

When the vacuum solenoid (eventually a coil) is activated vacuum (from connected hose) will pull the valve closed (vacuum bell with a diaphragm).

https://www.pss-autosoft.net/diagram...1214_M0DIS.htm

More reading from page 41.

https://www.ge39.com/files/m54x5.pdf

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