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What Is Modulation?

What is a modulation Valve's function on a Transmission.?

  • What are the symptoms if it is bad?

  • Answer:

    the modulator vale is a large vaccum operated valve that regulates transmission line pressure to the components. when there is a loss of vaccum (wide open throttle ) the transmission need to provide a firm shift. if the transmission does not have the ability to do this it will slip and cause transmission clutch failure.if it fails it will have a hard shift or will be very delayed. most of the time if this fails it will leak through the vac port.

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Other answers

It senses the lack of vacume in the engine intake and makes the trans shift later if you have it "floored"

Mr. KnowItAll

it helps automatic transmissions change gears

smoothie

If the diaphragm in the modulator valve goes bad the vehicle will smoke and the vacuum will suck the transmission fluid out.

wa4yne

The auto trans shifts according to speed and load. The modulator valve senses load and modulates the upshift pattern. Without it your trans would upshift very late at high revs. Jules, auto tech and lecturer.Australia.

Car won't shift at proper intervals, or shift at all. The Modulator valve is the vacuumm pressure adjustor for controlling shift points

[email protected]

Smooth shifting of the transmission. Erratic or slow shift, or no shift at all

David

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