E 450 V8-5.4L (2009)
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Ignition OFF.
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Verify the ambient air temperature sensor is correctly installed and fully connected.
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Is the ambient air temperature sensor correctly installed and fully connected?
Yes
GO to B2.
No
REINSTALL or RECONNECT the ambient air temperature sensor. TEST the system for normal operation.
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B2 CHECK THE AMBIENT AIR TEMPERATURE SENSOR FUNCTION
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Disconnect: Ambient Air Temperature Sensor C132.
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Remove the ambient air temperature sensor.
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Measure the resistance between the ambient air temperature sensor pins, component side, at an ambient temperature of 18-29.5°C (65-85°F).
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Is the resistance between 8,000 and 14,000 ohms?
Yes
GO to B3.
No
INSTALL a new ambient air temperature sensor. TEST the system for normal operation.
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B3 CHECK THE AMBIENT AIR TEMPERATURE SENSOR CIRCUIT FEED FOR AN OPEN
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Disconnect: Overhead Console C930.
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Measure the resistance between the overhead console C930-5, circuit VH407 (YE/GN), harness side and the ambient air temperature sensor
C132-1, circuit VH407 (YE/GN), harness side.
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Is the resistance less than 5 ohms?
Yes
GO to B4.
No
REPAIR the circuit. TEST the system for normal operation.
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B4 CHECK THE AMBIENT AIR TEMPERATURE SENSOR CIRCUIT RETURN FOR AN OPEN