Tech 2 question
Senior Member
Joined: 10-19-2013
Posts: 419
From: Dallas Texas
Cat
Maybe try removing it and cleaning it. I have heard this has helped some people. I park outside and mine is spot on, I think. Now I will be watching it more closely, lol. There is a crazy algorithm as to how it operates. Below is a copy paste of something I read here along time ago that I found interesting
This is a description of how the OAT sensor works. Its more complicated than one would think.
You will notice the very interesting information on how they changed the location of the sensor for 2008 models.
Outside Air Temperature
The outside air temperature is read by the body control module (BCM) and transmitted over serial data to the instrument panel cluster (IPC) for display in the driver information center (DIC). The BCM provides the logic for reading the outside air temperature sensor. The BCM sends the temperature to the IPC in Celsius. The IPC is responsible for displaying the temperature and converting to Fahrenheit.
The sensor operates within a temperature range of -40°C to +60°C (-40°F to +140°F). The ambient air temperature sensor is mounted in the forward engine area, behind the left front headlamp. This causes an air flow issue due to the sensor's location and can effect the ambient air update display parameter in the DIC of the vehicle. For model year 2008 the ambient air temperature sensor will have a new location closer to the grill airflow. In the present position, it is exposed to limited airflow from the grill before it reaches the radiator. The sensor signal varies between 0-5 volts.
The ambient air temperature sensor algorithm uses 3 pieces of information, outside air temperature data, vehicle speed, and time the engine was turned off.
The ambient air temperature is updated and displayed by the DIC under the following conditions:
Conditions
DIC Display
If the current ambient air temperature value is cooler than or equal to the old temperature value. Vehicle speed is in excess of 33 mph.
Displays outside actual temperature. Display updates every second.
If the current ambient air temperature value is warmer than the old temperature value. Vehicle speed is less than or drops below 18 mph.
Displays last temperature recorded during last ignition cycle. No update.
New ambient temperature exceeds the previous ignition cycle recorded ambient temperature, and vehicle speed exceeds 18 mph but is less than 33 mph.
Displays outside actual temperature. Display will be updated at a slow rate.
Vehicle speed is greater than or equal to 45 mph. (for at least 3 minutes)
Displays outside actual temperature Display updates at a quicker rate.
Maybe try removing it and cleaning it. I have heard this has helped some people. I park outside and mine is spot on, I think. Now I will be watching it more closely, lol. There is a crazy algorithm as to how it operates. Below is a copy paste of something I read here along time ago that I found interesting
This is a description of how the OAT sensor works. Its more complicated than one would think.
You will notice the very interesting information on how they changed the location of the sensor for 2008 models.
Outside Air Temperature
The outside air temperature is read by the body control module (BCM) and transmitted over serial data to the instrument panel cluster (IPC) for display in the driver information center (DIC). The BCM provides the logic for reading the outside air temperature sensor. The BCM sends the temperature to the IPC in Celsius. The IPC is responsible for displaying the temperature and converting to Fahrenheit.
The sensor operates within a temperature range of -40°C to +60°C (-40°F to +140°F). The ambient air temperature sensor is mounted in the forward engine area, behind the left front headlamp. This causes an air flow issue due to the sensor's location and can effect the ambient air update display parameter in the DIC of the vehicle. For model year 2008 the ambient air temperature sensor will have a new location closer to the grill airflow. In the present position, it is exposed to limited airflow from the grill before it reaches the radiator. The sensor signal varies between 0-5 volts.
The ambient air temperature sensor algorithm uses 3 pieces of information, outside air temperature data, vehicle speed, and time the engine was turned off.
The ambient air temperature is updated and displayed by the DIC under the following conditions:
Conditions
DIC Display
If the current ambient air temperature value is cooler than or equal to the old temperature value. Vehicle speed is in excess of 33 mph.
Displays outside actual temperature. Display updates every second.
If the current ambient air temperature value is warmer than the old temperature value. Vehicle speed is less than or drops below 18 mph.
Displays last temperature recorded during last ignition cycle. No update.
New ambient temperature exceeds the previous ignition cycle recorded ambient temperature, and vehicle speed exceeds 18 mph but is less than 33 mph.
Displays outside actual temperature. Display will be updated at a slow rate.
Vehicle speed is greater than or equal to 45 mph. (for at least 3 minutes)
Displays outside actual temperature Display updates at a quicker rate.
Thread Starter
Senior Member
Joined: 08-03-2010
Posts: 3,564
From: Lake Ronkonkoma, N.Y.
Just to clear confusion I was only curious if the tool could or could not do it. Chevy Manager answered my question. I don't have a problem with it. Thank you all for your input on this.
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