Re: [DML] Testing Lambda thermal switch

["Tom Niemczewski" <dmctom@xxxxxxxxx>]

Guys,

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
dmctom@xxxxxxxxx
www.deloreana.com


----- Original Message ----- 
From: "John Hervey" <john@xxxxxxxxxxxxxxxx>
To: <dmcnews@xxxxxxxxxxxxxxx>
Sent: Sunday, May 18, 2008 5:39 PM
Subject: RE: [DML] Testing Lambda thermal switch


> Paul, I laid 3 lambda sensor on my bench and used a multimeter with a 
> buzzer
> continuity tester and the show open on all 3 and on resistance nothing
> either. I haven't had time to put them in hot water.
> John Hervey
> www.specialtauto.com
>
>
> -----Original Message-----
> From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf 
> Of
> sweetp01569
> Sent: Thursday, May 15, 2008 2:50 PM
> To: dmcnews@xxxxxxxxxxxxxxx
> Subject: [DML] Testing Lambda thermal switch
>
> Using the MYDELOREAN.NET How-to guide #19, I get an open circuit
> between pin 7 and chassis ground for the test in step 3 with the
> engine cold, which indicates a failed switch or wiring. I get open
> circuit when the engine is warmed up, which is supposedly correct. How
> else can I test the thermal switch without removing the intake
> manifold and entering "the valley". I don't believe I have any weird
> idling symptoms, except for a little hesitation (like it wants to skip
> cylinders) when I press the gas when the engine is cold. Is this a
> possible symtom of a bad thermal switch?
>
> Thanks,
>
> Paul
>
>
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