Help with P1191

[Bhale]

I got a check engine light (MIL?) and pulled the code with my Smarty. Comes up as Intake air temperature performance which i assume is referring to the IAT sensor near the air filter. It looks clean but is there a way to test it before i go to the dealer and get one? Also, the exhaust brake is no longer working, is that because of the sensor?

Any help would be great..... Supposed to leave on vacation this sunday with the camper...

Brian

 

[Bob4x4]

Theory of Operation

The Inlet Air Pressure is part of the Inlet Temperature/Pressure Sensor which is located in the top of the air cleaner box. The Inlet Air Temperature Sensor performance looks at the outputs of four temperature sensors and compares them under cold start conditions. At key on after an 8 hour cold soak, the values of the Inlet Air Temperature, Engine Coolant Temperature, Intake Air Temperature and Battery Temperature sensors are compared. If the Engine Coolant, Intake Air and Battery Temperature Sensors agree and the Inlet Air Temperature does not agree, the Inlet Air Temperature Sensor is declared irrational. This diagnostics also checks for a change in sensor value over a period of time. This is to verify that the sensor is responding with temperature change. The ECM will illuminate the MIL lamp after this diagnostic runs a fails in two consecutive drive cycles. The ECM will turn off the MIL lamp once the diagnostic runs and passes in four consecutive drive cycles.

 

[Patrick9]

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