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Temp I testing

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Old Jul 1, 2012 | 06:15 PM
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Default Temp I testing
It works fine, that is the temp gauge does, but what are good resistance values for the Temp I sensor? I measured and got 623 Ohm between both pins and infinite resistance between each of the pins and ground.
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Old Jul 3, 2012 | 04:50 PM
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One more try
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Old Jul 3, 2012 | 06:42 PM
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This sensor works on a change in resistance between the pins to provide engine temp signal to the instrument panel gauge. 623 ohms is higher than the stated range for temp I and would be a very cold temp. Does your gauge stay pegged at the low end?
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Old Jul 3, 2012 | 07:17 PM
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Ah, ok, are the specs somewhere in the WSM? The temp gauge normally goes to about 82-ish degrees C. 623 ohms is at room temp of about 20 C.
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Old Jul 3, 2012 | 07:52 PM
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Has anyone done some nice testing and created plots with TEMP vs RESISTANCE?
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Old Jul 3, 2012 | 10:19 PM
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Originally Posted by fraggle
Has anyone done some nice testing and created plots with TEMP vs RESISTANCE?
Yes, in a book on the diagnosis of the 89 instrument cluster that is on Jim Morehouse's Tech Pub CD. There is a test procedure that allows you to read out the values it is seeing on the instrument panel.
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Old Jul 4, 2012 | 08:39 AM
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Originally Posted by Bill Ball
Yes, in a book on the diagnosis of the 89 instrument cluster that is on Jim Morehouse's Tech Pub CD. There is a test procedure that allows you to read out the values it is seeing on the instrument panel.
Great! Now that I see it I remember testing this a few years ago. Looks like 623 Ohm at 20 degrees C might be in line with these values. Thanks.

Temp I target values.png
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Old Jul 4, 2012 | 11:14 AM
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Yes, could be normal. I thought there must be some malfunction or you wouldn't ask. Anyway, you can compare resistance and gauge readings to an IR gun on the water bridge.
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Old Jul 5, 2012 | 12:00 PM
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Right. Just covering all bases during my top end and tb refresh.
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