OHC reads 140 degrees all the time? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 04-10-2015
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OHC reads 140 degrees all the time?

I just put in my ohc and for some reason the compass works fine I already calibrated it and set my variation. But my temp sensor reads 140 degrees. I unplugged it and it's still reading 140. So I put some contact grease on the connections and still the same thing. Any idea on why? Maybe crossed wires? I did have my girlfriend hook that up so they might be cRossed
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Old 04-10-2015
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Did you connect your vss wire?
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Old 04-10-2015
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Did you connect your vss wire?
Yes.
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Old 04-10-2015
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Where do you have the sensor mounted?
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Old 04-10-2015
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Where do you have the sensor mounted?
Behind the grill but I held it outside the car and it still does it
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Old 04-10-2015
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Mine acted weird like that before I hooked my vss wire up. The computer of yours might be bad
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Old 04-10-2015
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I'm going to try and flip the wires and if that doesn't work I'm going to unplug my vss from my ohc and then I'll go about getting a new ohc and temp sensor from the j/y
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Old 04-10-2015
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Its been along time since I have messed with the console sensor but if my memory serves me right the 140 temp reading means there is a short.

-40 means the circuit is broken.

I would trace your wires if nothing is pinch and no bare wires I would replace the sensor.

Also check to make sure correctly wired.
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Old 04-10-2015
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Originally Posted by vista4.0 View Post
Its been along time since I have messed with the console sensor but if my memory serves me right the 140 temp reading means there is a short.

-40 means the circuit is broken.

I would trace your wires if nothing is pinch and no bare wires I would replace the sensor.

Also check to make sure correctly wired.
Thanks. I tried flipping the wires and no help so I'm going to trace them back and check for breaks. Is there a way to test for power with a multimeter?
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Old 04-10-2015
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You could test for resistance.
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Old 04-10-2015
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I don't think the temp sensor wires matter if they're connected blue/white to blue white or blue/white to blue yellow or vice/versa.
Like mentioned the -40 means the temp sensor either isn't connected or is bad, never seen the 140 temp reading... could be something amiss with the circuit board inside.
I've been able to repair several where the display doesn't work at all, but not sure what would make the reading show 140 all the time (head scratcher)
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