Diagnostic Code Entered On: Wed Oct 06, 2010 11:00 pm
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Diagnostic Trouble Code Description:
Fuel Tank Pressure Sensor Performance
Possible Sensor Faults
ECM
Possible Related Diagnostic Trouble Codes
DTC P0450 or P0451
Circuit / System Description
The control module monitors the fuel tank pressure (FTP) sensor signal in order to detect vacuum decay and excess vacuum during the evaporative emission (EVAP) diagnostic test. The control module supplies a 5?V reference and a low reference circuit to the FTP sensor. This DTC sets if the engine control module (ECM) detects one of the following conditions:
The FTP sensor signal voltage is not within a calibrated range on a cold start-up.
The FTP sensor signal oscillates greater than a calibrated amount when vehicle speed is within a predetermined range.
