temp sensors -40
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Junior User
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temp sensors -40
so, I had my truck hooked up to a computer the other day and both the cold air intake sensor and the engine coolant sensor both read -40 and never changed.
the air intake sensor is brand new. any ideas on where to start? I will be working today but will have sporadic internet access so ill check back from my phone. thanks
the air intake sensor is brand new. any ideas on where to start? I will be working today but will have sporadic internet access so ill check back from my phone. thanks
Postmaster
Joined: Sep 2007
Posts: 4,195
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From: Medford Oregon
It doesn't, there is no physical wire from the coolant sensor to the PCM. PCM uses EOT for engine temp. The coolant sensor just goes to the dash meter. Scangauge wants to display something so it's displaying something else.
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Junior User
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There were 2 readings, one said cold air intake temperature the other sAid engine coolant temp. They both read -40.
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Hotshot
Joined: Oct 2003
Posts: 17,799
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From: Ashland City, TN
Yeah, no coolant temp sensor.
The PCM just guesses on that I think. Mine is always on par with my EOT for some reason. I took it off my scangauge though because I know its a false reading.
Air Intake Temperature, that sensor is on the fender drivers side. Usually in the airbox unless you have changed the filter to aftermarket.
The PCM just guesses on that I think. Mine is always on par with my EOT for some reason. I took it off my scangauge though because I know its a false reading.
Air Intake Temperature, that sensor is on the fender drivers side. Usually in the airbox unless you have changed the filter to aftermarket.
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Postmaster
Joined: Sep 2007
Posts: 4,195
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From: Medford Oregon
I have no experience with the Snap-On so I can't help. On 99+ trucks the PCM does monitor engine coolant sensor. On OBS trucks the PID is called IAT (intake air temp). I've never heard it called "cold air intake temp) but maybe that is what Snap-On calls it.
Cargo Master
Joined: Jul 2010
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Good to know. Thank you for the information.
Postmaster
Joined: Sep 2007
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From: Medford Oregon
Don't know, more than likely the scanner. If it faults the scanner should read 57* F as that is the default.
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Junior User
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That's wierd, cause before when there was no intake air sensor in there it was -40... Good to know and 57 makes way more sense for a default...
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Junior User
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so, essentially my air intake sensor is "reading" as disconnected? so what would be the difference between a default reading and a disconnected reading. is it just how the computer is interpreting the data? im so confused... thanks for the replys.