 Testing oil pressure and head temp sensors, need help from electrical gurus! |
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| mobymutt |
 Oct 1 2017, 05:15 PM
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#1
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Senior Member  Group: Members Posts: 553 Joined: 16-December 13 From: Kingston, Ontario, Canada Member No.: 16,770 Region Association: Canada  |
Trying a new thread, with less words, since my last one was ignored. (IMG:style_emoticons/default/chair.gif)
How do I test the stock oil pressure and head temp sensors to see if they work? They aren't wired to anything, and I don't have gauges for them. Thanks! Matt |
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| troth |
Oct 1 2017, 07:11 PM
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#2
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Member Group: Members Posts: 155 Joined: 17-August 16 From: CT/WA Member No.: 20,305 Region Association: None |
Put one lead of your ohmmeter on the connector wire and the other lead goes to battery negative or some other ground on the car.
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| Dave_Darling |
Oct 1 2017, 07:23 PM
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#3
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914 Idiot Group: Members Posts: 15,063 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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The stock CHT sensor and the stock oil temp sensor both are thermistors. They are things that vary their resistance depending on temperature. So you use an ohmmeter to check them; connect one probe to the connector on the sensor, and connect the other to whatever the sensor is grounded to.
The stock CHT sensor runs on the order of 2500 ohms when cold, down to 100 or less when the engine is at operating temp. I do not remember the resistance range for the oil temp sender. --DD |
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| troth |
Oct 1 2017, 07:47 PM
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#4
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Member Group: Members Posts: 155 Joined: 17-August 16 From: CT/WA Member No.: 20,305 Region Association: None |
The oil pressure sensor I don't think would have a spec for resistance because it is a switch. It will either have an infinite or very small resistance reading depending on whether you have low pressure or not.
With ignition off (low pressure), you should have close to 0 resistance. If you switch ignition on but don't start the car, idiot light should come on. If you start the car and let oil pressurize for a second and then read again you should have a very high resistance and light will be off. |
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| mobymutt |
Oct 2 2017, 06:57 AM
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#5
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Senior Member Group: Members Posts: 553 Joined: 16-December 13 From: Kingston, Ontario, Canada Member No.: 16,770 Region Association: Canada |
Great, thanks!
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| Dave_Darling |
Oct 2 2017, 01:08 PM
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#6
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914 Idiot Group: Members Posts: 15,063 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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QUOTE(troth @ Oct 1 2017, 06:47 PM)  The oil pressure sensor I don't think would have a spec for resistance because it is a switch. Oops! Didn't read carefully enough, I was thinking oil temp sender, not pressure. --DD |
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