w201 m103 ac low pressure switch wiring - PeachParts Mercedes-Benz Forum

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w201 m103 ac low pressure switch wiring

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#1

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11-04-2018, 10:30 PM

lsmalley

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Quote:

Originally Posted by RPM55

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You need to check to be sure the speed sensor on the compressor is putting out a voltage when the compressor is running. The MAS relay needs this signal to keep the clutch engaged. The value should be greater than .25v at idle.

I am getting no voltage at the rpm sensor with compressor running.

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#2

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11-05-2018, 10:44 AM

Diseasel300 Diseasel300 is offline

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Quote:

Originally Posted by lsmalley

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I am getting no voltage at the rpm sensor with compressor running.

Are you reading AC or DC? The sensor output is an AC voltage.

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