Diagnostic Aids
- The following variable represents the latest temperature value to be displayed by the IPC. This variable can be Degrees Celsius or Degrees Fahrenheit. Range: -40 to 70°C (-40 to +158°F).
- After the ignition has been shut OFF and the engine is not running, the outside air temperature sensor must cool down for a period of time before the outside air temperature sensor reading is accurate. This is because the engine produces considerable heat after it has been shutdown. Without air movement across the sensor such as when the vehicle is moving, the outside air temperature sensor produces a false ambient temperature reading attributable to engine heat. A falling outside air temperature sensor reading is always accepted and filtered into the display.
- Upon initial vehicle start-up, the outside air temperature sensor speed counter estimates the amount of time the vehicle will need to be in motion before the outside air temperature sensor will be reading true ambient temperature. As soon as the counter reaches this point it is assumed the driver has been driving the given amount of time for the sensor to cool to ambient. At this point, the outside air temperature readings are filtered into the display.