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No temperature reading


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mack45692
New User

May 28, 2015, 3:02 PM

Post #1 of 4 (922 views)
No temperature reading Sign In

Have a 2007 chevy cobalt that on digital display has --- for coolant Temp. reading.Have already replaced temp. sensor and connecting wiring,had to disconnect battery to reset and within a day went back to --- for reading.What else could be the problem?


(This post was edited by mack45692 on May 29, 2015, 5:16 PM)


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

May 28, 2015, 8:12 PM

Post #2 of 4 (913 views)
Re: No temperature reading Sign In

Is this the ambient outside temperature display? If so, you'll probably need to have a high end scan tool connected up to read the BCM datastream to see what outside temp voltage is. The BCM transmits the outside temperature information to the instrument cluster over the vehicle's network.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on May 28, 2015, 8:14 PM)


mack45692
New User

May 29, 2015, 5:15 PM

Post #3 of 4 (890 views)
Re: No temperature reading Sign In

it is for coolant temperature


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

May 29, 2015, 6:03 PM

Post #4 of 4 (887 views)
Re: No temperature reading Sign In

Your still going to need to get hold of a high end scan tool to look at datastream information. Depending on which engine you have either PCM or the BCM sends coolant temperature information to the instrument cluster. Knowing if the BCM and/or PCM is seeing engine coolant sensor voltage, will determine which way you should go. You can probably also scan those modules to see if there are any trouble codes stored that might give some clues. Because this system uses computers and networks, it almost impossible to troubleshoot without the proper equipment.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on May 29, 2015, 6:04 PM)






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