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2010 hyundia sonata 2.4 l has coolant temp -54 and iat -54…

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2010 hyundia sonata 2.4 l...
2010 hyundia sonata 2.4 l has coolant temp -54 and iat -54 no codes and runs rich what is issue with cts
Submitted: 2 years ago.Category: Hyundai
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Answered in 5 minutes by:
1/26/2016
Hyundai Mechanic: Dan, Technician replied 2 years ago
Dan
Dan, Technician
Category: Hyundai
Satisfied Customers: 26,049
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
Verified

Hello, my name is***** is actual temp outside? Have you replaced the cts yet? Thanks.

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Customer reply replied 2 years ago
out side temp 68 deg. I have no codes but the cts is -54 and iat is -54 and starts good cold or hot , temp gage works good and not on cold. the cts and iat are friving me crazy . they will not move
Customer reply replied 2 years ago
my name is ***** ***** tho cts and iat are -54 there is no big drivability issues, starts good , just runs rich and uses excessive fuel. I tested iat ohms was 2.56k and 5 volt ref good and both cts and iat , ground good , but still see -54
Hyundai Mechanic: Dan, Technician replied 2 years ago

Are you checking the temp readings with scantool or dash? Does cts ever change as vehicle warms up?

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Customer reply replied 2 years ago
I am checking at scan tool , snap on verdict and a modius, both show -54 but yet no codes
Customer reply replied 2 years ago
no cts never changes as warms up but gage on dash goes up to half after run for a wahile
Hyundai Mechanic: Dan, Technician replied 2 years ago

Neither of them share the same circuit so it sounds like problem is either your ECM or the sensor. I'd start by replacing the cts to see if that helps. If not, next step will be to check wiring between ECT and ECM, if good replace the ECM. Here is a wiring diagram to help with testing. Let me know if there is anything else I can do to help. Thanks.

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https://www.dropbox.com/s/7zdsbj00bca34bn/ects.pdf?dl=0

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