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IAT Sensor wiring diagnosis

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  • Staff

My ScanGauge2 is showing my IAT constantly at -40F. I just installed a brand new IAT sensor, with no change. Since it's reading -40f constantly, is that an indication that it has a bad ground wire?

 

I have the IAT sensor trouble code showing until I can get this fixed.

 

Thanks!

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  • Owner

No. The signal is shorted to ground which produces the -40°F. When the signal is open and no ground present then the value will be 240°F. Being grounding the signal wire will drop to 0V (-40°F) and open signal will be +5V (240°F)

  • Author
  • Staff

I lucked out on this. Previous owner had messed with the sensor connector and the positive wire pin wasn't contacting the sensor pin. 

 

I ended up cutting both wires so that the pins could lock into the connector, and then I connected them back to the two wires. Now my IAT sensor is working correctly again.

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Welcome To Mopar1973Man.Com LLC

We are privately owned, with access to a professional Diesel Mechanic, who can provide additional support for Dodge Ram Cummins Diesel vehicles. Many detailed information is FREE and available to read. However, in order to interact directly with our Diesel Mechanic, Michael, by phone, via zoom, or as the web-based option, Subscription Plans are offered that will enable these and other features.  Go to the Subscription Page and Select a desired plan. At any time you wish to cancel the Subscription, click Subscription Page, select the 'Cancel' button, and it will be canceled. For your convenience, all subscriptions are on auto-renewal.