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Chevrolet
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2009
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Impala SS
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls And Fuel - 5.3L - DTC P0420 To DTC P0690
›
DTC P0446
›
Typical Scan Tool Data
Typical Scan Tool Data
FTP Sensor Signal Voltage
Fuel Tank Pressure
1.5V
Atmospheric Pressure/BARO
Less than 1.5V
Positive Pressure
More than 1.5V
Negative Pressure/Vacuum