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What are the steps for adjusting a TPS on a 1986 Cadillac Deville?

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You need a voltmeter to adjust it . Back probe the signal wire with aT pin or small paper clip . Hook voltmeter negative lead to ground and the positive to the T pin . You have to measure voltage between one of the pins and ground. When the throttle is closed, should be around 0.5 volts. Fully open is 5 volts. To check for the correct wire . there are three wires , one should have 5 volts , one should have continuity with ground . None of those is the one ! The signal return is probably the center wire , that's the one you check on . Just double check .

Posted on Dec 25, 2016

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  • Jeff Armer Dec 25, 2016

    Your welcome and Merry Christmas to you as well !

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1986 Cadillac Sedan Deville. Does anyone have an image of what the throttle position sensor looks like and exactly where its located? Thanks


I found this picture, if that is correct? Probably a three wire connector, ref voltage--ground--signal. I did see another picture, I wasn't sure? This picture said dfi.
26402035-t1caujrehn2c51ceuh1dikd4-1-0.jpg

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My 2003 Cadillac DeVille it will crank but wont stay running what could be the problem and it shakes a little bit


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Is my 1986 cadillac deville front wheel drive?


Hello krazyhot1
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1 Answer

How do you release the emergency brake on a 1986 Cadillac Deville?


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May 20, 2010 | 1986 Cadillac DeVille

1 Answer

My 1986 cadillac deville cranks over but wont start what could it be?


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How do I replace the TPS on a 97 Cadillac Deville?


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1 Answer

I have a 95 Cadilliac DeVille 4.9 high idle , I have changed the ISC and new plugs, wires. Also have cleanded the carburator, what would cause this?


The tps and isc motor have to be set a certain way to work like they are supposed to. The voltage output of the tps must be set with the ics motor not contacting the throttle lever. Then the ics motor plunger must be at its highest setting and adjusted to the correct tps setting of that point. You will need to read a service manual to perform this operation and get the correct settings.

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1 Answer

I would like to find out what error codes e26 e27 e52 mean on service soon of 1986 Cadillac Deville


E26 - Shorted Throttle Switch Circuit
E27 - Open circuit in throttle switch
On these 2 codes replace the TPS and clear codes (throttle position sensor).
E52 PCM/ECM Memory Reset
Have u cleared the memory? don't worry about this code.

Apr 08, 2009 | 1987 Cadillac DeVille

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