RE: [DML] Testing Lambda thermal switch
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RE: [DML] Testing Lambda thermal switch

This morning I read about 1 ohm when the switch closed naturally because of
the resistance of the contacts and I got about 62 degree when the switched
closed. Difference in the meter and the accuracy of the switch.
John Hervey


-----Original Message-----
From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf Of
Tom Niemczewski
Sent: Sunday, May 18, 2008 11:47 AM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: Re: [DML] Testing Lambda thermal switch


Let me help you out with testing of this switch.
It is a switch, so you will only see two states - shorted (about 0 ohms) or 
open (infinite). There should be no resistance in this circuit... well, 
maybe 1 or 2 ohms for the wiring. If you see more then it's time to clean 
the connections.
According to the shop manual (page D:04:10 and D:04:11) the switch will 
activate when the temperature is BELOW 15 degrees C or 59 degrees F. This 
means that below this temperature it should be shorted (single ohms, beep on

continuity test) and above this temperature it should read open circuit.

I hope this helps

Tom Niemczewski
vin 6149 (in Poland!)
Google earth: 52°25'17.30"N 21° 1'58.00"E

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