Diagnostic Trouble Code: B1257
Diagnostic Trouble Code Name: Air temperature external sensor circuit short to ground
Vehicle Make: Ford
Vehicle Model: Falcon (FG)
Diagnostic Code Entered By: ZerOne
Diagnostic Code Entered On: Wed Oct 06, 2010 11:00 pm
|
Please Note: The DTC Information provided has been randomly generated.
To view the correct Diagnostic Code Information, Please Login, or Register.
Diagnostic Trouble Code Description:
Outside Air Temperature Sensor Circuit
Possible Sensor Faults
Heating, Ventilation, A.C. (HVAC)
Possible Related Diagnostic Trouble Codes
DTC B0158 or B0168
Circuit / System Description
The HVAC control module monitors the air temperature sensors with a low reference circuit and 5-volt signal circuit. The HVAC control module monitors the voltage drop across the sensor. 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.
|