Water temp not working on scan gageII - Ford Powerstroke Diesel Forum
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Old 02-23-2010, 04:34 PM
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Water temp not working on scan gageII

I have a scan gage II and the water temp is not working it shows -40 all the time. On my other cars it works. All other things show up like trans temp, map, speed, lod, etc. I was wondering if I had a bad coolant temp sensor or something? The dummy gage says just below half once its warmed up. heat works well warms up pretty fast. So would I get a check engine light if the coolant temp sensor was bad?

Thanks
Duane
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Old 02-24-2010, 04:52 AM
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Any Ideas?
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Old 02-24-2010, 07:56 AM
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I am pretty sure the 7.3 does not have a coolant temp probe that the ECM reads. the 6.0 does. I monitor engine oil temp on my edge monitor since I dont get an option for coolant.
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Old 02-24-2010, 07:58 AM
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ok something new to know about these things. I will have to get the code for engine oil temp on my scan gage

Thanks
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Old 02-24-2010, 08:03 AM
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I think EOT is more useful anyway. I can have the coolant at 170 deg and the oil tem is just hardly over 135 to 140. I dont consider my truck as up to temp till I see 165 EOT.
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Old 02-24-2010, 11:52 AM
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Mine says -40 all the time too. I assume the PCM must know the coolant temp but I have not seen a code for it.

The scangauge site has a whole section for 7.3 diesels and has codes for injector pressure, pulse width, engine oil temp, and more.

There is also a handy plug near the thermostat if you ever wanted to install a real water temp gauge. Many people use this port for their coolant filters.
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Old 02-25-2010, 05:22 PM
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I have the same gauge in my 2000 and it doesn't read water temp. Not sure what year yours is if you give them a call they are very helpfull and with email you all the xgauge codes for the 7.3L.
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