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Diagnostic Trouble Code: 2
Diagnostic Trouble Code Name: Ambient Air Temperature Sensor
Vehicle Make: Holden
Vehicle Model: Epica (V250)
Diagnostic Code Entered By: ZerOne
Diagnostic Code Entered On: Wed Oct 06, 2010 11:00 pm
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Diagnostic Trouble Code Description:
Ambient Air Temperature Sensor Circuit
Possible Sensor Faults
Instrument Cluster
Possible Related Diagnostic Trouble Codes
DTC B0158
Circuit / System Description
The instrument cluster monitors the ambient air temperature sensor with a low reference circuit and 5?V signal circuit. The instrument cluster monitors the voltage drop across the sensor, which is proportional to temperature. When the ambient air temperatures are cold, the resistance of the sensor is high and the voltage signals are high. When the ambient air temperatures are hot, the resistance of the sensors is low and the voltage signals are low. The instrument cluster converts the voltage value to a temperature value of Celsius or Fahrenheit that will be displayed by the display.
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