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Old 02-04-2022, 06:55 PM
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Join Date: Aug 2019
Location: Ellicott city, MD
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Testing overload protection relay

Hi, I have a 1986 190d 2.5 non-turbo.

My tach only works when it wants to, about 25% of the time.

I tested the sensor on the bell housing and it tests good.

Is there any way to test the overload protection relay?

I understand that it sends a signal to the tach.

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Old 02-06-2022, 11:20 PM
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Cruisin on Electric Ave.
 
Join Date: May 2008
Location: Springfield VA
Posts: 5,211
The OVP relay powers the EDS (engine) computer, and several other control units. Does your car idle at the correct speed when the tach isn't working?

-J
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1991 350SDL. 230,000 miles (new motor @ 150,000).

Tesla Model 3. 136,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.
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Old 02-07-2022, 01:18 AM
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No, it idles very rough and the a/c compressor does not come on. When the tach works, it idles fine but the a/c compressor still doesn't work. I did find a way to check the OVP after hours of searching. It tests as it should.

I started another thread called "rough idle after start up" which ties into this, so I don't want to confuse anyone. Could you have a look through that thread and give me your thoughts? Thanks.

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